README

A PHP 5.5+ tax management library.

Features:

• Smart data model designed for fluctuating tax rate amounts ("19% -> 21% on January 1st")
• Predefined tax rates for EU countries and Switzerland. More to come.
• Tax resolvers with logic for all major use cases.

Requires commerceguys/zone.

The backstory behind the library design can be found in this blog post.

Don't see your country's tax types and rates in the dataset? Send us a PR!

Data model

Zone 1-1 TaxType 1-n TaxRate 1-n TaxRateAmount

Each tax type has a zone and one or more tax rates. Each tax rate has one or more tax rate amounts.

Example:

• Tax type: French VAT
• Zone: "France (VAT)" (covers "France without Corsica" and "Monaco")
• Tax rates: Standard, Intermediate, Reduced, Super Reduced
• Tax rate amounts for Standard: 19.6% (until January 1st 2014), 20% (from January 1st 2014)

The base interfaces don't impose setters, since they aren't needed by the service classes. Extended interfaces (TaxTypeEntityInterface, (TaxRateEntityInterface, (TaxRateAmountEntityInterface) are provided for that purpose, as well as matching TaxType, TaxRate and TaxRateAmount classes that can be used as examples or mapped by Doctrine.

Tax resolvers

The process of finding the most suitable tax type/rate/amount for the given taxable object is called resolving. Along with the Taxable object, a Context object containing customer and store information is also passed to the system.

Tax is resolved in three steps:

1. Resolve the tax types.
2. Resolve the tax rate for each resolved tax type.
3. Get the tax rate amount for each resolved tax rate (by calling $rate->getAmount($date)).

Tax types and tax rates are resolved by invoking registered resolvers (sorted by priority) until one of them returns a result.

Included tax type resolvers:

• CanadaTaxTypeResolver (Canada specific logic)

  The store charges the tax defined by the customer’s home province/territory.

  If selling from a store in Quebec to a customer in Ontario, apply the Ontario HST.

• EuTaxTypeResolver (EU specific logic)

  A French store selling physical products (e.g. t-shirts) will charge French VAT to EU customers.

  A French store selling digital products (e.g. ebooks) from Jan 1st 2015 will apply the EU customer's tax rates (German customer - German VAT, etc)

  A French store will charge the 0% Intra-Community rate if the EU customer has provided a VAT number.

• DefaultTaxTypeResolver (logic valid for most countries)

  If both the customer and the store belong to the same zone, returns the matched tax type.

  The Serbian store is selling to a Serbian customer, use Serbian VAT.

Included tax rate resolvers:

• DefaultTaxRateResolver - Returns a tax type's default tax rate.

Users would create a custom resolver for:

• "No tax in New York for t-shirts under 200$"
• "No tax for school supplies on september 1st (US tax holiday)"
• "Reduced rate for ebooks in France and other countries".
• "Return the tax type / rate referenced by the $taxable object" (explicit place of supply, e.g. "French company providing a training in Spain")

Usage example:

use CommerceGuys\Tax\Repository\TaxTypeRepository;
use CommerceGuys\Tax\Resolver\TaxType\ChainTaxTypeResolver;
use CommerceGuys\Tax\Resolver\TaxType\CanadaTaxTypeResolver;
use CommerceGuys\Tax\Resolver\TaxType\EuTaxTypeResolver;
use CommerceGuys\Tax\Resolver\TaxType\DefaultTaxTypeResolver;
use CommerceGuys\Tax\Resolver\TaxRate\ChainTaxRateResolver;
use CommerceGuys\Tax\Resolver\TaxRate\DefaultTaxRateResolver;
use CommerceGuys\Tax\Resolver\TaxResolver;

// The repository, and the resolvers are usualy initialized by the
// container, this is just a verbose example.
$taxTypeRepository = new TaxTypeRepository();
$chainTaxTypeResolver = new ChainTaxTypeResolver();
$chainTaxTypeResolver->addResolver(new CanadaTaxTypeResolver($taxTypeRepository));
$chainTaxTypeResolver->addResolver(new EuTaxTypeResolver($taxTypeRepository));
$chainTaxTypeResolver->addResolver(new DefaultTaxTypeResolver($taxTypeRepository));
$chainTaxRateResolver = new ChainTaxRateResolver();
$chainTaxRateResolver->addResolver(new DefaultTaxRateResolver());
$resolver = new TaxResolver($chainTaxTypeResolver, $chainTaxRateResolver);

// You can also provide the customer's tax number (e.g. VAT number needed
// to trigger Intra-Community supply rules in EU), list of additional countries
// where the store is registered to collect tax, a different calculation date.
$context = new Context($customerAddress, $storeAddress);

$amounts = $resolver->resolveAmounts($taxable, $context);
// More rarely, if only the types or rates are needed:
$rates = $resolver->resolveRates($taxable, $context);
$types = $resolver->resolveTypes($taxable, $context);

Credits

• Source for EU data