diff --git a/app/Services/Billing/InvoiceDocument.php b/app/Services/Billing/InvoiceDocument.php
new file mode 100644
index 0000000..fd2f22b
--- /dev/null
+++ b/app/Services/Billing/InvoiceDocument.php
@@ -0,0 +1,95 @@
+<?php
+
+namespace App\Services\Billing;
+
+use TCPDF;
+
+/**
+ * The page furniture: the logo block at the top and the footer at the bottom.
+ *
+ * A subclass because TCPDF draws headers and footers through overridden
+ * methods, and the footer has to repeat on every page — an invoice that runs to
+ * two pages must carry the company's register and VAT numbers on both, or the
+ * second page is not part of a valid invoice.
+ *
+ * The body is not built here. It is a Blade template rendered to HTML and
+ * handed to writeHTML(), because a table of line items expressed as a hundred
+ * Cell() calls with millimetre coordinates is a table nobody will ever adjust.
+ */
+final class InvoiceDocument extends TCPDF
+{
+    /** @var array<string, mixed> */
+    private array $issuer = [];
+
+    private string $logoFile = '';
+
+    private string $pageLabel = 'Seite';
+
+    /** @param array<string, mixed> $issuer */
+    public function setIssuer(array $issuer, string $logoFile = '', string $pageLabel = 'Seite'): void
+    {
+        $this->issuer = $issuer;
+        $this->logoFile = $logoFile;
+        $this->pageLabel = $pageLabel;
+    }
+
+    public function Header(): void // phpcs:ignore
+    {
+        if ($this->logoFile === '' || ! is_file($this->logoFile)) {
+            return;
+        }
+
+        // Top right, height-constrained. Width 0 lets TCPDF keep the aspect
+        // ratio — a logo squeezed to a fixed box is worse than none.
+        $this->Image($this->logoFile, 140, 12, 0, 18, '', '', 'T', false, 300, 'R');
+    }
+
+    public function Footer(): void // phpcs:ignore
+    {
+        $this->SetY(-26);
+        $this->SetFont('dejavusans', '', 6.5);
+        $this->SetTextColor(110, 110, 122);
+
+        $columns = [
+            [
+                $this->issuer['name'] ?? '',
+                $this->issuer['address'] ?? '',
+                trim(($this->issuer['postcode'] ?? '').' '.($this->issuer['city'] ?? '')),
+            ],
+            [
+                $this->issuer['phone'] ?? '',
+                $this->issuer['email'] ?? '',
+                $this->issuer['website'] ?? '',
+            ],
+            [
+                $this->issuer['register_number'] ?? '',
+                $this->issuer['vat_id'] ?? '',
+                $this->issuer['register_court'] ?? '',
+            ],
+            [
+                $this->issuer['bank_name'] ?? '',
+                $this->issuer['iban'] ?? '',
+                $this->issuer['bic'] ?? '',
+            ],
+        ];
+
+        // A hairline above it, the same one the totals block uses, so the page
+        // reads as one document rather than two halves.
+        $this->SetDrawColor(233, 233, 238);
+        $this->Line(20, $this->GetY() - 3, 190, $this->GetY() - 3);
+
+        $width = 42.5;
+
+        foreach ($columns as $index => $lines) {
+            $this->SetXY(20 + ($index * $width), -24);
+            // Empty entries are dropped rather than printed as blank lines: a
+            // company with no register number should not have a gap where one
+            // would be.
+            $this->MultiCell($width - 2, 3, implode("\n", array_filter($lines, fn ($l) => trim((string) $l) !== '')), 0, 'L', false, 0, '', '', true, 0, false, true, 0, 'T');
+        }
+
+        $this->SetXY(150, -30);
+        $this->SetFont('dejavusans', '', 6.5);
+        $this->Cell(40, 3, $this->pageLabel.' '.$this->getAliasNumPage().'/'.$this->getAliasNbPages(), 0, 0, 'R');
+    }
+}
diff --git a/app/Services/Billing/InvoiceMath.php b/app/Services/Billing/InvoiceMath.php
new file mode 100644
index 0000000..fa42d5d
--- /dev/null
+++ b/app/Services/Billing/InvoiceMath.php
@@ -0,0 +1,109 @@
+<?php
+
+namespace App\Services\Billing;
+
+/**
+ * The arithmetic on an invoice, in cents, rounded once.
+ *
+ * Everything is integer cents from end to end. Money in floats accumulates a
+ * cent here and there and then the sum printed under a column does not match
+ * the column — which on an invoice is not a rounding artefact, it is a document
+ * that does not add up.
+ *
+ * Rounding happens ONCE, at the point a figure is shown or stored, never per
+ * line and then again on the total. A percentage discount applied line by line
+ * and rounded each time drifts from the same discount applied to the sum, and
+ * the customer's calculator is the one that will find it.
+ *
+ * Net is the basis for everything. Gross is derived and never the other way
+ * round: taking VAT out of a gross figure and putting it back gives a different
+ * number often enough to matter.
+ */
+final class InvoiceMath
+{
+    /** A discount or surcharge as a percentage of something. */
+    public const PERCENT = 'percent';
+
+    /** A discount or surcharge as a fixed amount in cents. */
+    public const AMOUNT = 'amount';
+
+    /**
+     * One line's net total before any invoice-level adjustment.
+     *
+     * Quantity carries three decimals — hours, gigabytes and part-months are
+     * all real — so it is held as thousandths and divided out at the end,
+     * rather than multiplying a float by a price.
+     */
+    public static function lineNet(int $unitNetCents, int $quantityMilli): int
+    {
+        return (int) round($unitNetCents * $quantityMilli / 1000);
+    }
+
+    /**
+     * A discount or surcharge, as a signed amount in cents.
+     *
+     * Positive raises the total, negative lowers it — so a discount is passed
+     * as a negative value and a surcharge as a positive one, and nothing has to
+     * remember which of two flags means which.
+     *
+     * @param  string  $type  PERCENT (value in hundredths of a percent) or
+     *                        AMOUNT (value in cents)
+     */
+    public static function adjustment(int $baseCents, string $type, int $value): int
+    {
+        return $type === self::PERCENT
+            ? (int) round($baseCents * $value / 10000)
+            : $value;
+    }
+
+    /** VAT on a net figure. `$rateBasisPoints` is 2000 for 20 %. */
+    public static function tax(int $netCents, int $rateBasisPoints): int
+    {
+        return (int) round($netCents * $rateBasisPoints / 10000);
+    }
+
+    /**
+     * Every figure the document shows, from the lines and one adjustment.
+     *
+     * @param  array<int, array{unit_net_cents:int, quantity_milli:int}>  $lines
+     * @param  array{type:string, value:int}|null  $adjustment
+     * @return array{lines_net:int, adjustment:int, net:int, tax:int, gross:int}
+     */
+    public static function totals(array $lines, ?array $adjustment, int $rateBasisPoints): array
+    {
+        $linesNet = 0;
+
+        foreach ($lines as $line) {
+            $linesNet += self::lineNet((int) $line['unit_net_cents'], (int) $line['quantity_milli']);
+        }
+
+        $adjusted = $adjustment === null
+            ? 0
+            : self::adjustment($linesNet, (string) $adjustment['type'], (int) $adjustment['value']);
+
+        $net = $linesNet + $adjusted;
+        $tax = self::tax($net, $rateBasisPoints);
+
+        return [
+            'lines_net' => $linesNet,
+            'adjustment' => $adjusted,
+            'net' => $net,
+            'tax' => $tax,
+            'gross' => $net + $tax,
+        ];
+    }
+
+    /** "1.234,56" — Austrian formatting, done here so no view invents its own. */
+    public static function money(int $cents): string
+    {
+        return number_format($cents / 100, 2, ',', '.');
+    }
+
+    /** "12", "1,5", "0,25" — trailing zeroes dropped, because "12,000 Std." reads as a defect. */
+    public static function quantity(int $quantityMilli): string
+    {
+        $formatted = number_format($quantityMilli / 1000, 3, ',', '.');
+
+        return rtrim(rtrim($formatted, '0'), ',');
+    }
+}
diff --git a/app/Services/Billing/InvoiceRenderer.php b/app/Services/Billing/InvoiceRenderer.php
new file mode 100644
index 0000000..97f1a9d
--- /dev/null
+++ b/app/Services/Billing/InvoiceRenderer.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace App\Services\Billing;
+
+use App\Models\Invoice;
+use Illuminate\Support\Facades\Storage;
+use Illuminate\Support\Facades\View;
+
+/**
+ * An invoice as a PDF, built only from what was frozen into the document.
+ *
+ * Nothing here reads today's settings. Every value — the issuer's address, its
+ * VAT number, the rate, the customer's address, the lines — comes from the
+ * snapshot taken when the number was assigned. That is what makes it safe to
+ * store no PDF at all: rendering the same invoice in 2033 produces the same
+ * page it produced on the day it was issued, whatever has changed in between.
+ *
+ * The one exception is the logo file, which is referenced by path rather than
+ * copied. A replaced logo therefore appears on old invoices too — recorded here
+ * as a known limitation rather than hidden: keeping every superseded logo
+ * forever is a real cost, and a changed mark on a reprint misleads nobody about
+ * what was charged.
+ */
+final class InvoiceRenderer
+{
+    public function forInvoice(Invoice $invoice): string
+    {
+        return $this->render((array) $invoice->snapshot);
+    }
+
+    /** @param array<string, mixed> $snapshot */
+    public function render(array $snapshot): string
+    {
+        $issuer = (array) ($snapshot['issuer'] ?? []);
+
+        $pdf = new InvoiceDocument('P', 'mm', 'A4', true, 'UTF-8');
+        $pdf->setIssuer($issuer, $this->logoFile($issuer), __('invoice.page'));
+
+        $pdf->SetCreator('CluPilot');
+        $pdf->SetAuthor((string) ($issuer['name'] ?? ''));
+        $pdf->SetTitle((string) ($snapshot['meta']['number'] ?? ''));
+
+        // Room at the bottom for the four-column footer, which is fixed height
+        // and would otherwise be written over the last line of the table.
+        $pdf->SetMargins(20, 34, 20);
+        $pdf->SetAutoPageBreak(true, 34);
+        $pdf->SetFont('dejavusans', '', 9);
+
+        $pdf->AddPage();
+
+        // Rendered from a Blade template: a table of line items expressed as
+        // Cell() calls with millimetre coordinates is a table nobody will ever
+        // adjust, and this one has to be adjusted the first time somebody sees
+        // it on paper.
+        $pdf->writeHTML(
+            View::make('pdf.invoice', ['s' => $snapshot])->render(),
+            true, false, true, false, ''
+        );
+
+        return $pdf->Output('', 'S');
+    }
+
+    /**
+     * The logo on disk, or nothing.
+     *
+     * Nothing is a perfectly good answer: an invoice without a logo is still a
+     * valid invoice, and refusing to render one because an image is missing
+     * would block the only document that actually has to exist.
+     *
+     * @param  array<string, mixed>  $issuer
+     */
+    private function logoFile(array $issuer): string
+    {
+        $path = trim((string) ($issuer['logo_path'] ?? ''));
+
+        if ($path === '') {
+            return '';
+        }
+
+        $full = Storage::disk('public')->path($path);
+
+        return is_file($full) ? $full : '';
+    }
+}
diff --git a/app/Services/Billing/SampleInvoice.php b/app/Services/Billing/SampleInvoice.php
new file mode 100644
index 0000000..a73913b
--- /dev/null
+++ b/app/Services/Billing/SampleInvoice.php
@@ -0,0 +1,99 @@
+<?php
+
+namespace App\Services\Billing;
+
+use App\Support\CompanyProfile;
+
+/**
+ * A specimen invoice, for looking at the layout before anything is issued.
+ *
+ * It uses the real company details where they have been entered and obvious
+ * placeholders where they have not, so the preview shows what is still missing
+ * rather than a page that looks finished and is not.
+ *
+ * The customer and the lines are invented on purpose and say so. A specimen
+ * that looks like a real document is a specimen somebody eventually files.
+ */
+final class SampleInvoice
+{
+    /** @return array<string, mixed> */
+    public static function snapshot(): array
+    {
+        $issuer = CompanyProfile::all();
+
+        foreach (['name' => 'Ihr Firmenwortlaut e.U.', 'address' => 'Musterstraße 1', 'postcode' => '1010', 'city' => 'Wien', 'vat_id' => 'ATU00000000'] as $field => $placeholder) {
+            if (trim((string) ($issuer[$field] ?? '')) === '') {
+                $issuer[$field] = $placeholder;
+            }
+        }
+
+        $rate = (int) round(CompanyProfile::taxRate() * 100);
+
+        $lines = [
+            [
+                'description' => 'CluPilot Cloud — Paket Start',
+                'details' => ['Abrechnungszeitraum 01.08.2026 – 31.08.2026', '500 GB Speicher, 4 Kerne, 8 GB RAM'],
+                'quantity_milli' => 1000,
+                'unit' => '',
+                'unit_net_cents' => 1900,
+            ],
+            [
+                'description' => 'Zusatzspeicher 250 GB',
+                'details' => ['Add-on, monatlich'],
+                'quantity_milli' => 2000,
+                'unit' => '',
+                'unit_net_cents' => 500,
+            ],
+            [
+                'description' => 'Zusätzliches Datenvolumen',
+                'details' => ['Add-on, monatlich'],
+                'quantity_milli' => 1000,
+                'unit' => '',
+                'unit_net_cents' => 900,
+            ],
+            [
+                'description' => 'Einrichtung und Datenübernahme',
+                'details' => ['einmalig, 2,5 Stunden'],
+                'quantity_milli' => 2500,
+                'unit' => 'Std.',
+                'unit_net_cents' => 9000,
+            ],
+        ];
+
+        // A discount on the specimen deliberately: it is the part of the layout
+        // most likely to be wrong, and the only way to find that out is to see
+        // it printed.
+        $adjustment = ['type' => InvoiceMath::PERCENT, 'value' => -1000];
+
+        $totals = InvoiceMath::totals($lines, $adjustment, $rate) + ['rate_basis_points' => $rate];
+
+        return [
+            'issuer' => $issuer,
+            'customer' => [
+                'name' => 'Muster GmbH (Beispiel)',
+                'address' => 'Beispielgasse 12/3',
+                'postcode' => '1030',
+                'city' => 'Wien',
+                'country' => 'Österreich',
+                'vat_id' => 'ATU11111111',
+            ],
+            'meta' => [
+                'title' => __('invoice.title'),
+                'number' => 'RE-'.now()->format('Y').'-0001',
+                'customer_number' => 'KN-0001',
+                'issued_on' => now()->local()->format('d.m.Y'),
+                'due_on' => now()->local()->addDays((int) CompanyProfile::get('payment_days', 14))->format('d.m.Y'),
+                'currency' => 'EUR',
+                'salutation' => 'Sehr geehrte Damen und Herren,',
+                'intro' => 'wir erlauben uns, für die im Folgenden aufgeführten Leistungen in Rechnung zu stellen.',
+                'adjustment_label' => 'Rabatt 10 %',
+                'payment_terms' => trim((string) CompanyProfile::get('payment_terms')) !== ''
+                    ? (string) CompanyProfile::get('payment_terms')
+                    : 'Zahlbar ohne Abzug innerhalb von '.CompanyProfile::get('payment_days', 14).' Tagen auf das unten angeführte Konto.',
+                'closing' => 'Dies ist ein Muster zur Ansicht des Layouts. Es ist keine Rechnung und keine Zahlungsaufforderung.',
+            ],
+            'lines' => $lines,
+            'totals' => $totals,
+        ];
+    }
+}
diff --git a/composer.json b/composer.json
index 2d8fee4..0bd2400 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
         "livewire/livewire": "^3.0",
         "phpseclib/phpseclib": "^3.0",
         "spatie/laravel-permission": "^8.3",
-        "tecnickcom/tcpdf": "^7.0",
+        "tecnickcom/tcpdf": "^6.10",
         "wire-elements/modal": "^3.0"
     },
     "require-dev": {
diff --git a/composer.lock b/composer.lock
index 65753b3..1cd5328 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "4dd7de1f16d082e59e6993debfbac9b1",
+    "content-hash": "08df94f724a2740a2df4b29fcd1eea9a",
     "packages": [
         {
             "name": "bacon/bacon-qr-code",
@@ -8352,953 +8352,23 @@
             ],
             "time": "2026-06-08T20:24:16+00:00"
         },
-        {
-            "name": "tecnickcom/tc-lib-barcode",
-            "version": "2.12.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/tecnickcom/tc-lib-barcode.git",
-                "reference": "0614e905c903600c2491d3a90174a9a87a2fab9b"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/tecnickcom/tc-lib-barcode/zipball/0614e905c903600c2491d3a90174a9a87a2fab9b",
-                "reference": "0614e905c903600c2491d3a90174a9a87a2fab9b",
-                "shasum": ""
-            },
-            "require": {
-                "ext-bcmath": "*",
-                "ext-gd": "*",
-                "php": ">=8.2",
-                "tecnickcom/tc-lib-color": "^2.13"
-            },
-            "require-dev": {
-                "pdepend/pdepend": "^2.16",
-                "phpunit/phpunit": "^11.5 || ^12.5 || ^13.2"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "Com\\Tecnick\\Barcode\\": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "LGPL-3.0-or-later"
-            ],
-            "authors": [
-                {
-                    "name": "Nicola Asuni",
-                    "email": "info@tecnick.com",
-                    "role": "lead"
-                }
-            ],
-            "description": "PHP library to generate linear and bidimensional barcodes",
-            "homepage": "https://tcpdf.org",
-            "keywords": [
-                "3 of 9",
-                "ANSI MH10.8M-1983",
-                "CBC",
-                "CODABAR",
-                "CODE 11",
-                "CODE 128 A B C",
-                "CODE 39",
-                "CODE 93",
-                "EAN 13",
-                "EAN 8",
-                "ECC200",
-                "ISO IEC 15438 2006",
-                "ISO IEC 16022",
-                "ISO IEC 24778 2008",
-                "Intelligent Mail Barcode",
-                "Interleaved 2 of 5",
-                "KIX",
-                "Klant",
-                "MSI",
-                "Onecode",
-                "PHARMACODE",
-                "PHARMACODE TWO-TRACKS",
-                "POSTNET",
-                "RMS4CC",
-                "Standard 2 of 5",
-                "UPC-A",
-                "UPC-E",
-                "USD-3",
-                "USPS-B-3200",
-                "USS-93",
-                "aztec",
-                "barcode",
-                "datamatrix",
-                "pdf417",
-                "planet",
-                "qr-code",
-                "royal mail",
-                "tc-lib-barcode",
-                "upc"
-            ],
-            "support": {
-                "issues": "https://github.com/tecnickcom/tc-lib-barcode/issues",
-                "source": "https://github.com/tecnickcom/tc-lib-barcode"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sponsors/tecnickcom",
-                    "type": "github"
-                }
-            ],
-            "time": "2026-07-17T19:05:47+00:00"
-        },
-        {
-            "name": "tecnickcom/tc-lib-color",
-            "version": "2.13.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/tecnickcom/tc-lib-color.git",
-                "reference": "38303066464928bbcfe8e54d006c828b02e4c62f"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/tecnickcom/tc-lib-color/zipball/38303066464928bbcfe8e54d006c828b02e4c62f",
-                "reference": "38303066464928bbcfe8e54d006c828b02e4c62f",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=8.2"
-            },
-            "require-dev": {
-                "pdepend/pdepend": "^2.16",
-                "phpunit/phpunit": "^11.5 || ^12.5 || ^13.2"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "Com\\Tecnick\\Color\\": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "LGPL-3.0-or-later"
-            ],
-            "authors": [
-                {
-                    "name": "Nicola Asuni",
-                    "email": "info@tecnick.com",
-                    "role": "lead"
-                }
-            ],
-            "description": "PHP library to manipulate various color representations",
-            "homepage": "https://tcpdf.org",
-            "keywords": [
-                "cmyk",
-                "color",
-                "colors",
-                "colour",
-                "colours",
-                "hsl",
-                "hsla",
-                "javascript",
-                "rgb",
-                "rgba",
-                "tc-lib-color",
-                "web"
-            ],
-            "support": {
-                "issues": "https://github.com/tecnickcom/tc-lib-color/issues",
-                "source": "https://github.com/tecnickcom/tc-lib-color"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sponsors/tecnickcom",
-                    "type": "github"
-                }
-            ],
-            "time": "2026-07-17T19:02:53+00:00"
-        },
-        {
-            "name": "tecnickcom/tc-lib-file",
-            "version": "3.7.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/tecnickcom/tc-lib-file.git",
-                "reference": "45a9b04e530b80b0212af6de1c6c111c37f8eb35"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/tecnickcom/tc-lib-file/zipball/45a9b04e530b80b0212af6de1c6c111c37f8eb35",
-                "reference": "45a9b04e530b80b0212af6de1c6c111c37f8eb35",
-                "shasum": ""
-            },
-            "require": {
-                "ext-curl": "*",
-                "php": ">=8.2"
-            },
-            "require-dev": {
-                "pdepend/pdepend": "^2.16",
-                "phpunit/phpunit": "^13.2 || ^12.5 || ^11.5"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "Com\\Tecnick\\File\\": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "LGPL-3.0-or-later"
-            ],
-            "authors": [
-                {
-                    "name": "Nicola Asuni",
-                    "email": "info@tecnick.com",
-                    "role": "lead"
-                }
-            ],
-            "description": "PHP library to read byte-level data from files",
-            "homepage": "https://tcpdf.org",
-            "keywords": [
-                "Double",
-                "bit",
-                "byte",
-                "file",
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-                "LGPL-3.0-or-later"
-            ],
-            "authors": [
-                {
-                    "name": "Nicola Asuni",
-                    "email": "info@tecnick.com",
-                    "role": "lead"
-                }
-            ],
-            "description": "PHP library containing Unicode methods",
-            "homepage": "https://tcpdf.org",
-            "keywords": [
-                "font",
-                "pdf",
-                "tc-lib-unicode",
-                "unicode",
-                "utf-8"
-            ],
-            "support": {
-                "issues": "https://github.com/tecnickcom/tc-lib-unicode/issues",
-                "source": "https://github.com/tecnickcom/tc-lib-unicode"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sponsors/tecnickcom",
-                    "type": "github"
-                }
-            ],
-            "time": "2026-07-17T19:09:36+00:00"
-        },
-        {
-            "name": "tecnickcom/tc-lib-unicode-data",
-            "version": "2.7.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/tecnickcom/tc-lib-unicode-data.git",
-                "reference": "9354f1661e7bafcf2ee68e408ed07a3fcf264b98"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/tecnickcom/tc-lib-unicode-data/zipball/9354f1661e7bafcf2ee68e408ed07a3fcf264b98",
-                "reference": "9354f1661e7bafcf2ee68e408ed07a3fcf264b98",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=8.2"
-            },
-            "require-dev": {
-                "pdepend/pdepend": "^2.16",
-                "phpunit/phpunit": "^11.5 || ^12.5 || ^13.2"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "Com\\Tecnick\\Unicode\\Data\\": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "LGPL-3.0-or-later"
-            ],
-            "authors": [
-                {
-                    "name": "Nicola Asuni",
-                    "email": "info@tecnick.com",
-                    "role": "lead"
-                }
-            ],
-            "description": "PHP library containing Unicode definitions",
-            "homepage": "https://tcpdf.org",
-            "keywords": [
-                "font",
-                "pdf",
-                "tc-lib-unicode-data",
-                "unicode",
-                "utf-8"
-            ],
-            "support": {
-                "issues": "https://github.com/tecnickcom/tc-lib-unicode-data/issues",
-                "source": "https://github.com/tecnickcom/tc-lib-unicode-data"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/sponsors/tecnickcom",
-                    "type": "github"
-                }
-            ],
-            "time": "2026-07-17T19:03:56+00:00"
-        },
         {
             "name": "tecnickcom/tcpdf",
-            "version": "7.0.4",
+            "version": "6.11.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/tecnickcom/TCPDF.git",
-                "reference": "7b8de35a6224b7791a91fc09427a18a0a8aecd83"
+                "reference": "b18f6119161019916c5bb07cb8da5205ae5c1b63"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/tecnickcom/TCPDF/zipball/7b8de35a6224b7791a91fc09427a18a0a8aecd83",
-                "reference": "7b8de35a6224b7791a91fc09427a18a0a8aecd83",
+                "url": "https://api.github.com/repos/tecnickcom/TCPDF/zipball/b18f6119161019916c5bb07cb8da5205ae5c1b63",
+                "reference": "b18f6119161019916c5bb07cb8da5205ae5c1b63",
                 "shasum": ""
             },
             "require": {
                 "ext-curl": "*",
-                "php": ">=8.2",
-                "tecnickcom/tc-lib-pdf": "^8"
-            },
-            "require-dev": {
-                "pdepend/pdepend": "^2.16",
-                "phpunit/phpunit": "^11.5 || ^12.5 || ^13.2"
+                "php": ">=7.1.0"
             },
             "suggest": {
                 "ext-gd": "Enables additional image handling in some workflows.",
@@ -9310,7 +8380,19 @@
             "autoload": {
                 "classmap": [
                     "config",
-                    "tcpdf.php"
+                    "include",
+                    "tcpdf.php",
+                    "tcpdf_barcodes_1d.php",
+                    "tcpdf_barcodes_2d.php",
+                    "include/tcpdf_colors.php",
+                    "include/tcpdf_filters.php",
+                    "include/tcpdf_font_data.php",
+                    "include/tcpdf_fonts.php",
+                    "include/tcpdf_images.php",
+                    "include/tcpdf_static.php",
+                    "include/barcodes/datamatrix.php",
+                    "include/barcodes/pdf417.php",
+                    "include/barcodes/qrcode.php"
                 ]
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -9324,7 +8406,7 @@
                     "role": "lead"
                 }
             ],
-            "description": "Deprecated legacy PDF engine for PHP. Use instead tecnickcom/tc-lib-pdf.",
+            "description": "Deprecated legacy PDF engine for PHP. For new projects use tecnickcom/tc-lib-pdf.",
             "homepage": "https://tcpdf.org",
             "keywords": [
                 "PDFD32000-2008",
@@ -9341,11 +8423,11 @@
             },
             "funding": [
                 {
-                    "url": "https://github.com/sponsors/tecnickcom",
-                    "type": "github"
+                    "url": "https://www.paypal.com/donate/?hosted_button_id=NZUEC5XS8MFBJ",
+                    "type": "paypal"
                 }
             ],
-            "time": "2026-07-13T10:06:03+00:00"
+            "time": "2026-04-21T17:00:18+00:00"
         },
         {
             "name": "tijsverkoyen/css-to-inline-styles",
diff --git a/lang/de/invoice.php b/lang/de/invoice.php
new file mode 100644
index 0000000..f01194b
--- /dev/null
+++ b/lang/de/invoice.php
@@ -0,0 +1,25 @@
+<?php
+
+return [
+    'title' => 'Rechnung',
+    'number' => 'Rechnungs-Nr.',
+    'date' => 'Datum',
+    'due' => 'Fällig am',
+    'customer_number' => 'Kunde',
+    'customer_vat' => 'UID',
+    'page' => 'Seite',
+
+    'col_pos' => 'Pos',
+    'col_description' => 'Beschreibung',
+    'col_quantity' => 'Menge',
+    'col_unit_net' => 'Einzelpreis netto',
+    'col_total_net' => 'Gesamt netto',
+    'col_total_gross' => 'Gesamt brutto',
+
+    'adjustment' => 'Rabatt',
+    'net' => 'Nettobetrag',
+    'tax' => 'Umsatzsteuer :rate %',
+    'gross' => 'Gesamtsumme',
+
+    'payment_title' => 'Zahlungsbedingungen',
+];
diff --git a/lang/en/invoice.php b/lang/en/invoice.php
new file mode 100644
index 0000000..cc814ba
--- /dev/null
+++ b/lang/en/invoice.php
@@ -0,0 +1,25 @@
+<?php
+
+return [
+    'title' => 'Invoice',
+    'number' => 'Invoice no.',
+    'date' => 'Date',
+    'due' => 'Due',
+    'customer_number' => 'Customer',
+    'customer_vat' => 'VAT ID',
+    'page' => 'Page',
+
+    'col_pos' => 'Pos',
+    'col_description' => 'Description',
+    'col_quantity' => 'Qty',
+    'col_unit_net' => 'Unit price net',
+    'col_total_net' => 'Total net',
+    'col_total_gross' => 'Total gross',
+
+    'adjustment' => 'Discount',
+    'net' => 'Net amount',
+    'tax' => 'VAT :rate %',
+    'gross' => 'Total',
+
+    'payment_title' => 'Payment terms',
+];
diff --git a/resources/views/pdf/invoice.blade.php b/resources/views/pdf/invoice.blade.php
new file mode 100644
index 0000000..2cc599e
--- /dev/null
+++ b/resources/views/pdf/invoice.blade.php
@@ -0,0 +1,144 @@
+{{--
+    The body of an invoice, for TCPDF's writeHTML().
+
+    Tables and inline styles, and a narrower dialect than even an email: TCPDF
+    understands a small subset of HTML and almost no CSS. No flexbox, no grid,
+    no shorthand borders on table cells, no percentage padding. What works is a
+    table with widths, and text-align.
+
+    Every value comes from the frozen snapshot ($s). Nothing here reads a
+    setting or a model — that is the whole reason no PDF has to be stored.
+--}}
+@php
+    use App\Services\Billing\InvoiceMath;
+
+    $issuer = $s['issuer'] ?? [];
+    $customer = $s['customer'] ?? [];
+    $meta = $s['meta'] ?? [];
+    $lines = $s['lines'] ?? [];
+    $totals = $s['totals'] ?? [];
+@endphp
+
+{{-- Sender line above the address, small — the line that shows through a
+     window envelope and tells the postman where to return it. --}}
+<table cellpadding="0" cellspacing="0" style="width:100%;">
+    <tr>
+        <td style="width:58%; font-size:6.5pt; color:#6e6e7a; border-bottom:0.2mm solid #b4b4be;">
+            {{ collect([$issuer['name'] ?? null, $issuer['address'] ?? null, trim(($issuer['postcode'] ?? '').' '.($issuer['city'] ?? '')), $issuer['country'] ?? null])->filter()->join(' | ') }}
+        </td>
+        <td style="width:42%;"></td>
+    </tr>
+</table>
+
+<table cellpadding="0" cellspacing="0" style="width:100%; margin-top:2mm;">
+    <tr>
+        <td style="width:58%; font-size:10pt; line-height:145%;">
+            <b>{{ $customer['name'] ?? '' }}</b><br>
+            {{ $customer['address'] ?? '' }}<br>
+            {{ trim(($customer['postcode'] ?? '').' '.($customer['city'] ?? '')) }}<br>
+            {{ $customer['country'] ?? '' }}
+            @if (! empty($customer['vat_id']))
+                <br>{{ __('invoice.customer_vat') }}: {{ $customer['vat_id'] }}
+            @endif
+        </td>
+        <td style="width:42%;"></td>
+    </tr>
+</table>
+
+{{-- The data block, right, level with the address. Its own table because
+     TCPDF has no way to float one beside the other. --}}
+<table cellpadding="1" cellspacing="0" style="width:100%; margin-top:14mm; font-size:9pt;">
+    <tr><td style="width:55%;"></td>
+        <td style="width:22%; color:#43434e;">{{ __('invoice.date') }}</td>
+        <td style="width:23%; text-align:right;">{{ $meta['issued_on'] ?? '' }}</td></tr>
+    @if (! empty($meta['customer_number']))
+    <tr><td></td>
+        <td style="color:#43434e;">{{ __('invoice.customer_number') }}</td>
+        <td style="text-align:right;">{{ $meta['customer_number'] }}</td></tr>
+    @endif
+    <tr><td></td>
+        <td style="color:#43434e;">{{ __('invoice.number') }}</td>
+        <td style="text-align:right;"><b>{{ $meta['number'] ?? '' }}</b></td></tr>
+    @if (! empty($meta['due_on']))
+    <tr><td></td>
+        <td style="color:#43434e;">{{ __('invoice.due') }}</td>
+        <td style="text-align:right;">{{ $meta['due_on'] }}</td></tr>
+    @endif
+</table>
+
+<h1 style="font-size:17pt; margin-top:10mm; margin-bottom:0;">{{ $meta['title'] ?? __('invoice.title') }}</h1>
+<p style="font-size:17pt; margin-top:0;">{{ $meta['number'] ?? '' }}</p>
+
+@if (! empty($meta['salutation']))
+    <p style="font-size:9.5pt; margin-top:6mm;">{{ $meta['salutation'] }}</p>
+@endif
+@if (! empty($meta['intro']))
+    <p style="font-size:9.5pt; line-height:150%;">{{ $meta['intro'] }}</p>
+@endif
+
+{{-- Quantity, net unit price, net total AND gross total per line: the invoice
+     goes to businesses and to consumers, and each reads a different column
+     first. --}}
+<table cellpadding="3" cellspacing="0" style="width:100%; margin-top:6mm; font-size:8.5pt;">
+    <tr style="font-weight:bold; background-color:#fafafb;">
+        <td style="width:7%; border-bottom:0.2mm solid #b4b4be;">{{ __('invoice.col_pos') }}</td>
+        <td style="width:41%; border-bottom:0.2mm solid #b4b4be;">{{ __('invoice.col_description') }}</td>
+        <td style="width:12%; text-align:right; border-bottom:0.2mm solid #b4b4be;">{{ __('invoice.col_quantity') }}</td>
+        <td style="width:14%; text-align:right; border-bottom:0.2mm solid #b4b4be;">{{ __('invoice.col_unit_net') }}</td>
+        <td style="width:13%; text-align:right; border-bottom:0.2mm solid #b4b4be;">{{ __('invoice.col_total_net') }}</td>
+        <td style="width:13%; text-align:right; border-bottom:0.2mm solid #b4b4be;">{{ __('invoice.col_total_gross') }}</td>
+    </tr>
+    @foreach ($lines as $index => $line)
+        @php
+            $net = InvoiceMath::lineNet((int) $line['unit_net_cents'], (int) $line['quantity_milli']);
+            $gross = $net + InvoiceMath::tax($net, (int) ($totals['rate_basis_points'] ?? 2000));
+        @endphp
+        <tr>
+            <td style="border-bottom:0.1mm solid #e9e9ee;">{{ $index + 1 }}</td>
+            <td style="border-bottom:0.1mm solid #e9e9ee;">
+                {{ $line['description'] ?? '' }}
+                @foreach (($line['details'] ?? []) as $detail)
+                    <br><span style="color:#6e6e7a;">{{ $detail }}</span>
+                @endforeach
+            </td>
+            <td style="text-align:right; border-bottom:0.1mm solid #e9e9ee;">{{ InvoiceMath::quantity((int) $line['quantity_milli']) }}@if (! empty($line['unit'])) {{ $line['unit'] }}@endif</td>
+            <td style="text-align:right; border-bottom:0.1mm solid #e9e9ee;">{{ InvoiceMath::money((int) $line['unit_net_cents']) }}</td>
+            <td style="text-align:right; border-bottom:0.1mm solid #e9e9ee;">{{ InvoiceMath::money($net) }}</td>
+            <td style="text-align:right; border-bottom:0.1mm solid #e9e9ee;">{{ InvoiceMath::money($gross) }}</td>
+        </tr>
+    @endforeach
+</table>
+
+<table cellpadding="3" cellspacing="0" style="width:100%; margin-top:4mm; font-size:9pt;">
+    @if (! empty($totals['adjustment']))
+        <tr>
+            <td style="width:60%;"></td>
+            <td style="width:25%;">{{ $meta['adjustment_label'] ?? __('invoice.adjustment') }}</td>
+            <td style="width:15%; text-align:right;">{{ InvoiceMath::money((int) $totals['adjustment']) }}</td>
+        </tr>
+    @endif
+    <tr>
+        <td></td>
+        <td>{{ __('invoice.net') }}</td>
+        <td style="text-align:right;">{{ InvoiceMath::money((int) ($totals['net'] ?? 0)) }}</td>
+    </tr>
+    <tr>
+        <td></td>
+        <td>{{ __('invoice.tax', ['rate' => rtrim(rtrim(number_format(($totals['rate_basis_points'] ?? 2000) / 100, 2, ',', '.'), '0'), ',')]) }}</td>
+        <td style="text-align:right;">{{ InvoiceMath::money((int) ($totals['tax'] ?? 0)) }}</td>
+    </tr>
+    <tr style="font-weight:bold;">
+        <td></td>
+        <td style="border-top:0.2mm solid #b4b4be;">{{ __('invoice.gross') }}</td>
+        <td style="text-align:right; border-top:0.2mm solid #b4b4be;">{{ InvoiceMath::money((int) ($totals['gross'] ?? 0)) }} {{ $meta['currency'] ?? 'EUR' }}</td>
+    </tr>
+</table>
+
+@if (! empty($meta['payment_terms']))
+    <p style="font-size:9pt; margin-top:10mm;"><b>{{ __('invoice.payment_title') }}</b></p>
+    <p style="font-size:9pt; line-height:150%; margin-top:0;">{{ $meta['payment_terms'] }}</p>
+@endif
+
+@if (! empty($meta['closing']))
+    <p style="font-size:9pt; line-height:150%; margin-top:6mm;">{{ $meta['closing'] }}</p>
+@endif
diff --git a/tests/Feature/Billing/InvoiceMathTest.php b/tests/Feature/Billing/InvoiceMathTest.php
new file mode 100644
index 0000000..de156c2
--- /dev/null
+++ b/tests/Feature/Billing/InvoiceMathTest.php
@@ -0,0 +1,92 @@
+<?php
+
+use App\Services\Billing\InvoiceMath;
+
+/**
+ * The arithmetic, which on an invoice is the whole product.
+ *
+ * A document that does not add up is not a rounding artefact, it is a document
+ * that does not add up — and the customer's calculator is what finds it.
+ */
+it('multiplies a fractional quantity without losing a cent', function () {
+    // 12,5 hours at 100,00 €
+    expect(InvoiceMath::lineNet(10000, 12500))->toBe(125000);
+
+    // 0,25 months at 19,00 € — 4,75, not 4,74 and not 4,76
+    expect(InvoiceMath::lineNet(1900, 250))->toBe(475);
+});
+
+it('applies a percentage to the sum, not line by line', function () {
+    // Three lines at 3,33 € with 10 % off. Rounded per line, each discount is
+    // 33 cents and the total is 99 — but 10 % of 9,99 € is 100 cents. One cent,
+    // on the line the customer checks first.
+    $lines = [
+        ['unit_net_cents' => 333, 'quantity_milli' => 1000],
+        ['unit_net_cents' => 333, 'quantity_milli' => 1000],
+        ['unit_net_cents' => 333, 'quantity_milli' => 1000],
+    ];
+
+    $totals = InvoiceMath::totals($lines, ['type' => InvoiceMath::PERCENT, 'value' => -1000], 2000);
+
+    expect($totals['lines_net'])->toBe(999)
+        ->and($totals['adjustment'])->toBe(-100)
+        ->and($totals['net'])->toBe(899);
+});
+
+it('treats a surcharge as the same operation with the other sign', function () {
+    // One rule, not two flags somebody has to remember the meaning of.
+    $lines = [['unit_net_cents' => 10000, 'quantity_milli' => 1000]];
+
+    $discounted = InvoiceMath::totals($lines, ['type' => InvoiceMath::PERCENT, 'value' => -2000], 2000);
+    $surcharged = InvoiceMath::totals($lines, ['type' => InvoiceMath::PERCENT, 'value' => 2000], 2000);
+
+    expect($discounted['net'])->toBe(8000)
+        ->and($surcharged['net'])->toBe(12000);
+});
+
+it('takes a fixed amount off as readily as a percentage', function () {
+    $lines = [['unit_net_cents' => 10000, 'quantity_milli' => 1000]];
+
+    $totals = InvoiceMath::totals($lines, ['type' => InvoiceMath::AMOUNT, 'value' => -1500], 2000);
+
+    expect($totals['net'])->toBe(8500)
+        ->and($totals['tax'])->toBe(1700)
+        ->and($totals['gross'])->toBe(10200);
+});
+
+it('adds up: net plus tax is gross, on the figures actually printed', function () {
+    // The assertion that matters, because it is the one a reader performs.
+    $lines = [
+        ['unit_net_cents' => 10000, 'quantity_milli' => 12000],
+        ['unit_net_cents' => 31200, 'quantity_milli' => 20000],
+    ];
+
+    $totals = InvoiceMath::totals($lines, ['type' => InvoiceMath::PERCENT, 'value' => -2000], 2000);
+
+    expect($totals['lines_net'])->toBe(744000)
+        ->and($totals['adjustment'])->toBe(-148800)
+        ->and($totals['net'])->toBe(595200)
+        ->and($totals['tax'])->toBe(119040)
+        ->and($totals['gross'])->toBe(714240)
+        ->and($totals['net'] + $totals['tax'])->toBe($totals['gross']);
+});
+
+it('derives gross from net and never the other way round', function () {
+    // 19,99 € net at 20 % is 23,99 €. Taking VAT back out of 23,99 gives 19,99
+    // here and 19,992 elsewhere — which is why only one direction is offered.
+    $totals = InvoiceMath::totals([['unit_net_cents' => 1999, 'quantity_milli' => 1000]], null, 2000);
+
+    expect($totals['tax'])->toBe(400)
+        ->and($totals['gross'])->toBe(2399);
+});
+
+it('formats money and quantities the way the document reads them', function () {
+    expect(InvoiceMath::money(714240))->toBe('7.142,40')
+        ->and(InvoiceMath::money(-14880))->toBe('-148,80')
+        ->and(InvoiceMath::money(0))->toBe('0,00');
+
+    // "12,000 Std." reads as a defect.
+    expect(InvoiceMath::quantity(12000))->toBe('12')
+        ->and(InvoiceMath::quantity(1500))->toBe('1,5')
+        ->and(InvoiceMath::quantity(250))->toBe('0,25');
+});