Get involved Payroll giving How does my tax rate affect my donation? Donations via Payroll Giving are taken after your National Insurance contributions are removed but before Income Tax is calculated and deducted. You will receive tax relief at the highest rate of tax you pay. If you pay 20% tax, 80% of your donation amount will be taken from your salary and 20% will be taken from the tax which would have gone to HMRC. You can read more about how this works here.