Withholding returns must be filed electronically for taxable years beginning from and after December 31, 2019. If this is an amended Form A1-QRT, check Box A, "Amended.Enter the amended numbers in all areas of the form, and explain why an amended return is being filed in the space provided. To mark Arizona Form 165 as an amended return, from the main menu of the Arizona return, select Heading Information > Amended. Check the amended return box on page 1 of the form if this is an amended return. Complete the amended return information section on page 2 of the form. The employee just came back to work after being gone for 2 weeks. Find out what to do if you receive multiple or amended tax slips. To file an amended return for a tax period prior to January 2017, make a copy of the original tax return you filed and need to change. Partnership Business taxpayers must complete an amended Form 165 and mail it to the appropriate mailing address with the amended box checked.