ISO AMT Credit Recovery 2027 Multi-Year Calculator
AMT paid on ISO exercise isn't lost — it creates an AMT credit (Form 8801) that recovers in future years when regular tax exceeds tentative AMT. Most ISO exercisers fully recover the AMT over 5-10 years.
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AMT paid on ISO exercise becomes a Prior Year Minimum Tax Credit, recovered in future years when your regular tax exceeds tentative AMT. The credit is tracked on Form 8801 and carries forward indefinitely — no expiration. Most ISO-exercisers recover the AMT over 5-10 years, depending on income and future ISO activity.
How the AMT Credit Works in 2027
Each year, calculate both regular tax and tentative AMT (Form 6251). If regular tax exceeds tentative AMT, the difference is the maximum AMT credit you can claim — applied via Form 8801 to reduce regular tax (but never below tentative AMT). Unused credit carries forward indefinitely. Note: only AMT generated by 'deferral items' (like ISO exercises) creates the credit — AMT from 'exclusion items' (like personal exemptions) does not.
Tracking AMT Credit Across Years
Form 8801 requires you to track the running balance every year — even years you don't use any credit. Many CPAs miss this because the form is buried and the calculation tedious. Keep a personal spreadsheet showing: ISO exercise year, AMT generated, credit balance start of year, credit used, credit balance end of year. Carry the spreadsheet through life — credit can stretch decades.
Strategies to Accelerate Recovery
Three accelerators: (1) raise your income (regular tax climbs faster than AMT). (2) Avoid additional ISO exercises that keep AMT high. (3) Generate ordinary income deliberately — Roth conversions, bond interest, NSO exercises. (4) Stop itemizing if state and local tax deduction was a major AMT preference item.
Last updated May 2026. Sources: IRS Form 8801 — AMT Credit, IRS Form 6251