2021/22 Tax Credit Information. This isn't just any donation, individuals can give up to $200, and married couples filing jointly can give up to $400. Remember – a tax credit is exactly that – A CREDIT (a donation that effectively costs you nothing)!!! It is a dollar for dollar reduction in your tax liability. Give your $ to a school or give your $ to the State of AZ. Either way, you must pay. Let’s make the State of AZ put those dollars in education!!!