6. Using custom tax calculators¶

Every TaxRate model holds a calculator variable with the name of the tax calculation service, used to compute the tax amount. While the default calculator should fit for most common use cases, you’re free to define your own implementation.

6.1. Creating the calculator¶

All calculators implement the TaxCalculatorInterface. First, you need to create a new class.

namespace Acme\Bundle\ShopBundle\TaxCalculator;

use Sylius\Bundle\TaxationBundle\Calculator\TaxCalculatorInterface;
use Sylius\Bundle\TaxationBundle\Model\TaxRateInterface;

class FeeCalculator implements TaxCalculatorInterface
{
    public function calculate($amount, TaxRate $rate)
    {
        return $amount * ($rate->getAmount() + 0,15 * 0,30);
    }
}