In general, you must make your tax credit donations no later than tax-day each year, in order for them to apply to the previous year.
The deadline to donate to a Qualifying Charitable Organization, and take
advantage of the Arizona Charitable Tax Credit on your 2019 state taxes, is
April 15, 2020 or whichever date you file your 2019 state taxes. Your tax professional
can answer additional questions about tax credits and the forms you need to
file your State returns to get the credit.