Paying AMT isn't always a total loss. Under certain conditions, the AMT you pay in one year can be credited back against your regular tax in a future year. But not every situation qualifies.

  • Paying AMT today may let you apply that amount as a credit in future years
  • The AMT credit can only be used in years where you do not also owe AMT
  • You claim it by filing IRS Form 8801 ("Credit for Prior Year Minimum Tax")
  • AMT triggers fall into two categories — only deferral items (like ISO exercises) qualify for the credit
  • The credit carries over indefinitely until fully used

What Is the AMT Credit?

The AMT credit is a built-in rebate in the system. When your AMT exceeds your regular tax — meaning you paid extra — the IRS lets you carry that excess forward as a credit against future regular tax bills.

The key word is excess. "AMT paid" doesn't mean total taxes paid that year — it means specifically the difference between your AMT and your regular tax.

Example:

  • Regular income tax: $30,000
  • AMT: $40,000
  • You paid $40,000 total (the higher amount)
  • "AMT paid" = $10,000 (the difference — this is your maximum future credit)

Deferral vs. Exclusion Items

Not all AMT triggers generate a credit. The IRS splits them into two categories:

Deferral Items — qualify for the credit ✓

One-time events that caused a tax spike but aren't recurring. The IRS recognizes the anomaly and lets you recoup the credit later.

  • Exercising Incentive Stock Options
  • Parts of an estate or trust
  • Mining, drilling, or research costs

Exclusion Items — do not qualify ✗

Things that cause a permanent difference in taxable income year over year. No credit for these.

  • Standard deduction or itemized deductions from prior year
  • Tax-exempt interest
  • Qualified small business stock

If you paid AMT for any reason other than exercising ISOs, consult a CPA to determine what portion qualifies.

Two Requirements to Use the AMT Credit

1. You must have paid AMT in a prior year

Specifically the excess of AMT over regular tax — not total taxes paid.

2. You cannot also owe AMT in the year you're claiming the credit

Example continued:

  • Year 2: Regular tax = $35,000 / AMT = $47,500 → AMT exceeds regular tax again (difference: $12,500)

  • You cannot use the $10,000 credit from Year 1 this year

  • But both amounts accumulate: $10,000 + $12,500 = $22,500 to carry forward

  • Year 3: Regular tax = $31,000 / No AMT owed

  • Apply $22,500 credit → actual tax owed: $8,500

The Credit Has No Cap and Carries Over Indefinitely

There's no maximum on how much credit you can apply in a given year, and it never expires.

  • Year 3 (alternative): Regular tax = $15,000 / No AMT
  • Apply $22,500 credit → tax reduced to $0
  • Remaining credit: $7,500 carries forward to the following year

One Thing to Know About 2026

The OBBBA changed the AMT phaseout rate from 0.25 to 0.50 starting in 2026, which means the exemption shrinks faster for high earners. This makes it easier to accidentally owe AMT in 2026 and beyond if you're exercising ISOs and earning above $500,000. Plan carefully — use the ISO Planner to find your optimal exercise amount.

Keep Track of Your Credit Yourself

The IRS doesn't maintain a running balance for you. After filing each year, note how much credit you had, how much you used, and how much carries forward. Keep this alongside your tax returns and ISO exercise documentation.

Ready to claim? Follow our step-by-step guide to filing Form 8801.