Only Arizonians who have an Arizona state tax liability are eligible to claim the tax credit. This is not a refundable credit. If the maximum allowable credit is more than you pay in state taxes annually, you can only receive back in a tax credit up to what your liability is.
You can contribute up to the amount of your expected Arizona tax liability. If you contribute more than your total state tax amount, the credits can be carried forward five years.
In general, you must make your tax credit donations by April 15, 2020 in order for them to apply to the 2019 year.