AMT Credit Carryforward 2027 Calculator
Estimate the minimum tax credit (Form 8801) generated from prior-year AMT and how much can offset 2027 regular tax.
What Is the AMT Credit Carryforward?
When you pay AMT due to timing items (like ISO exercise, accelerated depreciation, or installment sale gains), the difference between AMT and regular tax becomes a Minimum Tax Credit (MTC) you can carry forward indefinitely. You claim it on Form 8801 in any year where your regular tax exceeds your tentative minimum tax. Source: IRC §53. Last updated: May 2026.
How Much Credit Can You Use in 2027?
The maximum MTC you can claim in any year equals (Regular Tax minus Tentative Minimum Tax). If your 2027 regular tax is $65,000 and TMT is $58,000, you can use up to $7,000 of accumulated credit — even if you have $50,000 sitting in carryforward. Unused credit rolls to 2028 indefinitely.
Timing Items vs Exclusion Items
Only AMT from TIMING items generates credit (ISO bargain element, depreciation differences, installment sales). AMT from EXCLUSION items (state tax add-backs, miscellaneous deductions) does NOT create credit. Most ISO-exercise AMT qualifies — it's the most common credit source for tech employees.
Strategy: Recover Credit Faster
To use the credit quickly: (1) sell ISO shares in years after exercise to push regular tax above TMT, (2) avoid generating new AMT in recovery years, (3) bunch income or Roth conversions in non-AMT years to widen the regular-tax-over-TMT gap. Plan multi-year — credit is permanent so it always recovers eventually.
Frequently Asked Questions
What is the AMT credit carryforward?
The Minimum Tax Credit (MTC) is the AMT you paid in prior years from timing items (ISO exercise, depreciation, installment sales) that you can claim against regular tax in future years on Form 8801. It carries forward indefinitely with no expiration.
How much AMT credit can I use on my 2027 return?
You can claim MTC up to the amount your 2027 regular tax exceeds your 2027 Tentative Minimum Tax. If regular tax is $65,000 and TMT is $58,000, you can use $7,000 in 2027 \u2014 the rest carries to 2028.
Does AMT credit ever expire?
No. Unused minimum tax credit carries forward indefinitely until used. Even if you don't owe any AMT for the next decade, your credit stays alive on Form 8801 and offsets regular tax whenever regular tax exceeds tentative AMT.
What's the difference between timing and exclusion items?
Only AMT from TIMING items generates credit. Timing items reverse over time (ISO bargain element reverses when you sell, depreciation timing differences reverse). EXCLUSION items (state tax add-backs, private activity bond interest) are permanent and don't generate credit.
Can I claim AMT credit if I don't owe any AMT in 2027?
Yes \u2014 that's exactly when you USE it. You can only use MTC in years where regular tax exceeds TMT. Owing no AMT in 2027 means you're in a credit-using year. Use Form 8801 to claim it.
How is AMT credit different from a deduction?
MTC is a dollar-for-dollar reduction of federal tax owed \u2014 much more valuable than a deduction. $10,000 of MTC saves you $10,000 of tax, while $10,000 of deduction at a 24% bracket saves only $2,400.