README

cboxdk/laravel-tax — a self-hostable consumption-tax engine for Laravel. It owns the calculation logic — place-of-supply, reverse-charge, rate application, inclusive/exclusive — and sources only the rate data behind a pluggable contract. No forced third-party calculation SaaS.

Built on cboxdk/laravel-geo: every supply is assessed against a jurisdiction resolved from canonical ISO data, so tax is a function of (seller registrations, buyer jurisdiction, product type) — never a fuzzy country-name match.

The boundary: own the logic, source the data

use Cbox\Tax\Contracts\TaxCalculator;
use Cbox\Tax\ValueObjects\TaxQuery;
use Cbox\Tax\ValueObjects\SellerRegistrations;
use Cbox\Tax\Enums\{CustomerType, Pricing};
use Cbox\Geo\ValueObjects\CountryCode;
use Brick\Money\Money;

$assessment = app(TaxCalculator::class)->assess(new TaxQuery(
    amount: Money::of('100.00', 'EUR'),
    pricing: Pricing::Exclusive,
    place: $geo->find(new CountryCode('FR')),   // buyer jurisdiction (from laravel-geo)
    customer: CustomerType::Business,
    seller: new SellerRegistrations(new CountryCode('DE')),
    customerTaxIdValidated: true,               // VIES-validated
));

$assessment->treatment;   // TaxTreatment::ReverseCharge — intra-EU B2B, buyer self-accounts
$assessment->tax;         // Money 0.00 EUR
$assessment->reason;      // human-readable explanation for the audit trail

The engine decides whether and how to tax; the TaxRateSource contract supplies the rate number (an EU TEDB feed, the SST files, a commercial adapter). A missing rate is refused, never assumed 0%.

Multi-entity / seller-of-record routing

Tax depends on which selling entity issues the invoice. The same buyer is taxed differently by a German entity vs a French one:

Selling entity	Buyer (FR business, validated)	Result
German entity	cross-border intra-EU B2B	reverse charge — no VAT charged
French entity	domestic supply	French VAT is charged

SellerRegistrations (establishment + registrations) is the seller side of the calculation the billing engine supplies per invoice.

What's covered

	Regime	Status
EU VAT	`eu-vat` — Art. 44/45/58 place-of-supply, intra-EU B2B reverse charge	✅
National VAT/GST	UK, CH, NO, AU, NZ, MX, SG, TW, UAE, SA, BH, OM, TR, CL, ID, VN, PH, JP, KR, TH, UA	✅
India	`in-gst` — dual GST (IGST vs CGST+SGST), OIDAR destination, B2B reverse charge	✅
Malaysia	`my-sst` — SST service tax; charges B2B+B2C, no reverse charge	✅
US sales tax	`us-sales-tax` — nexus gate, per-state taxability, state/rooftop rate	✅
Canada GST/HST	`ca-gst` — province-level combined rate, cross-border B2B self-assessment	✅

See docs/coverage for the full per-country table with sources and confidence — and an honest list of jurisdictions we omit until their rate data is verified (a broad national-VAT batch pending primary-source confirmation, Pakistan's other provinces, and Brazil). We omit rather than ship a rate we cannot stand behind.

The US regime gates on three things before applying a rate — the state must be resolved (rooftop via the AddressGeocoder), the seller must have nexus in it, and the product must be taxable there — otherwise it returns NotRegistered or Exempt, never a wrong charge. Canada resolves at province level (no local tax). The shipped GeocodioGeocoder (AddressGeocoder) resolves US/Canada addresses; rate data (TEDB, SST, commercial) plugs in via TaxRateSource.

Unmodelled jurisdictions and missing rates are refused, not guessed.

Design

Contracts-first. TaxCalculator, TaxRegime, TaxRateSource, RegimeRegistry, AddressGeocoder, VatIdValidator, ReturnAggregator — bind and override any of them. Rate sources compose (static · remote · caching · chain).
Deny-by-default. No regime for a jurisdiction, or no rate, → an exception, never a silent zero.
Money is exact. Amounts are brick/money; rate maths rounds half-up once.

Requirements

PHP ^8.4; Laravel ^12 || ^13. See composer.json.

Development

composer install
composer qa    # pint --test, phpstan (level max), pest, license-check, audit

License

MIT.

cboxdk / laravel-tax

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