A tax credit is a tax incentive which allows certain taxpayers to subtract the amount of the credit they have accrued from the total they owe the state. It may also be a credit granted in recognition of taxes already paid or, as in the United Kingdom, a form of state support. A tax credit is a tax incentive which allows certain taxpayers to subtract the amount of the credit they have accrued from the total they owe the state. It may also be a credit granted in recognition of taxes already paid or, as in the United Kingdom, a form of state support. Many systems refer to taxes paid indirectly, such as taxes withheld by payers of income, as credits rather than prepayments. In such cases, the tax credit is invariably refundable. The most common forms of such amounts are payroll withholding of income tax or PAYE, withholding of tax at source on payments to nonresidents, and input credits for value added tax.