Step 1: Learn the calculation. The formula to calculate a retirement is quite simple.Premiums are not pro-rated. Examples: • Retire on May 20. We provide investment recommendations that helping maximize your long-term return. Each year we update your retirement plan to make sure you're on track. The Arizona income tax rate for retirees will be a flat 2.5 percent from the 2023 tax year onwards. Arizona does not tax Social Security benefits. DROP is a retirement benefit that allows Tier 1 public safety members who are already eligible for retirement to continue working while collecting a salary. • Within three years of retirement, ASRS members can register to attend the Route 3: Destination in Sight group meeting or online.