When you enter the Arizona state interview in TurboTax, proceed until you come to a screen headed "Depreciation Adjustment". If you sold or disposed of a property that took Section 179 bonus depreciation, answer "yes" and enter the adjustment for Arizona depreciation on the next screen.
If you did not sell or dispose of the property in 2018, then proceed to the next screen ("Any Other Addition Adjustments") and click on "yes". Note the second line ("Federal-Arizona other depreciation or amortization differences") - this tells you that you are on the right screen.
On the next screen enter the description ("Sec 179 addback to AZ income") and the amount to be added back to AZ income because of the difference in how Sec 179 is treated on the federal and the state.
