What is Alternative Minimum Tax (AMT) Credit?

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If you pay AMT after exercising ISOs, you will receive an AMT credit that can be used to lower your future tax bills. Read more about how to claim this credit.

The alternative minimum tax (AMT) credit is a reduction given to individuals who have paid alternative minimum tax in previous years. Exercising Incentive Stock Options (ISOs) often triggers AMT. Thus anyone who has exercised ISOs in years past may be eligible for AMT credits.

How to claim AMT Credit?

This primer addresses how to calculate AMT credit for ISO exercise transactions, then utilize the credit to reduce future tax obligations.

Did you pay AMT?

There are a number of ways to trigger AMT, but this primer will focus on ISO exercise.

When calculating AMT, your taxes are calculated in two ways:

1) Standard Tax

2) Alternative Minimum Tax

If your Alternative Minimum Tax calculation is higher than the Standard Tax version, you will owe AMT. This most commonly occurs after an ISO exercise. Check out ESO's AMT Calculator for more.

Below is a table on how options are taxed via Alternative Minimum Tax.

Event Regular Tax AMT
Time of Grant No Tax No Tax
Time of Exercise No Tax Income = FMV on date of Exercise - Exercise Price
Time of Sale Income = Proceeds – Exercise Price Income = Proceeds – FMV on date of Exercise

Typically, you will know whether or not you paid AMT in a calendar year. If you are in doubt, you can look back at old tax returns to confirm whether or not you paid AMT. Once you confirm how much AMT you paid, you can now begin the AMT credit process.

Claiming AMT Credit (Form 8801)

In order to claim your AMT credit, you will need to file IRS form 8801. You typically will not be able to claim 100% of your AMT credit right away due to limitations. Recall that when calculating AMT you calculate your tax in two ways. You are only able to claim AMT Credits based on the difference between your Standard Tax and Alternative Minimum Tax in any given year.

Simple example

Let's say you exercised ISOs and your AMT exceeded your Standard Tax by $50,000. This means you owed $50,000 in AMT for that tax year. Now in a subsequent tax year, with no ISO exercise, your Standard tax exceeds your AMT by $30,000.

You will be able to claim $30,000 in AMT Credit for that year. This leaves the remaining $20,000 to be claimed later on.

Complex Example

As a sample illustration, we’ll follow a typical ISO transaction from exercise through final sale and calculate what happens in 4 different scenarios.


  • ISO grant allowing the purchase of 100,000 shares at an strike price of $1 per share.
  • Fair Market Value (FMV) of the shares at the time of the exercise is $6 per share.
  • Final Sale of the shares takes place 2 years after exercise so all 4 examples are ISO qualified dispositions triggering LTCG (Holding Period Requirement for Long Term Capital Gains (LTCG) is for the date of the final sale to be at least 2 years from the ISO grant date and at least 1 year from the date of the exercise.)
  • This hypothetical tax payer is at the 20% LTCG and 28% AMT rates and has no offsetting income, AMT exemptions/phaseouts, or deductions other than this ISO transaction.
  • We disregard the 3.8% net investment income tax to simplify the tax rate at 20% for LTCG.

The valuation spread at the time of exercise is $5 per share (FMV – Strike Price). This results in $500,000 of AMT Income while regular tax income is $0 because ISO exercises are not subject to regular tax. So in the tax year of the ISO exercise, $140,000 of AMT tax will be due using the AMT rate of 28%. Paying this tax also raises the AMT Tax Cost Basis to $600,000 (100,000 x $6 FMV) whereas the regular tax cost basis remains at the exercise cost of $100,000 (100,000 x $1 Strike Price). This also results in $140,000 in AMT credit to be utilized in tax year when this tax payer’s regular tax is higher than AMT. In this example, we assume that will take place in the year of the sale.

Scenario #1 Sale Price = FMV #2 Sale Price > FMV #3 Sale Price < FMV #4 Sale Price < Exercise Price
Gross Sale Proceeds $600,000 @ $6 per share $2,000,000 @ $20 per share $400,000 @ $4 per share $50,000 @ $0.50 per share
Regular Tax Cost Basis $100,000 $100,000 $100,000 $100,000
AMT Tax Cost Basis $600,000 $600,000 $600,000 $600,000
AMT Credit $140,000 $140,000 $140,000 $140,000
Regular Tax at Sale $100,000 on $500,000 income (LTCG tax rate 20%) $380,000 on $1,900,000 income (LTCG tax rate 20%) $60,000 on $300,000 income (LTCG tax rate 20%) $0 on $50,000 capital loss carry forward
AMT Tax at Sale $0 on $0 income $280,000 on $1,400,000 (AMT LTCG rate is also 20%) $0 on $200,000 capital loss $0 on $550,000 capital loss carry forward
AMT Credit $100,000 credit utilized $40,000 carryover to future years $100,000 credit utilized $40,000 carryover to future years $60,000 credit utilized $80,000 carryover to future years $0 credit utilized $140,000 carryover to future years
Final Tax on Sale $0 $280,000 $0 $0
Cumulative Taxes Paid (1) $140,000 $420,000 $140,000 $140,000
AMT Credit Carry Over (2) $40,000 $40,000 $80,000 $140,000
Final Tax if Sale on Same Day Exercise @ 37% rate (3) $185,000 $703,000 $111,000 $0
Max Tax Savings from Early Exercise (3)-(1)+(2) $85,000 $323,000 $51,000 $0


Many tax professionals describe AMT tax as a timing tax because of the AMT credit offset in future years. As illustrated above, the AMT credit reversal really depends on many contributing factors in the year of sale:

  • First, there must be regular capital gains. The AMT reversing adjustment is really a AMT capital gain/loss adjustment because of the tax basis difference between regular and AMT. Without regular capital gain, the reversing AMT basis adjustment will only generate an AMT capital loss carryover, which does not lower the current year AMT liability.
  • Second, regular tax must be higher than AMT tax. The bigger the gap, more AMT credit will free up.Timing is everything. To maximize AMT credit offset, we want other realized capital gains. We also want other ordinary income, which helps create a bigger gap between regular and AMT simply because the top rates for regular and AMT are 37% and 28% respectively.
  • Lastly, there are many other items (income, deductions, credits, etc) on the returns that may affect the tax calculations, which is beyond the scope of this primer.

This content is for general information purposes only and should not be used as a substitute for consultation with professional advisors such as Leung, Louie, & Co. LLP whom ESO thanks for contributing the information behind this post.

For more information on tax savings, please contact us below. For help funding exercise related taxes, check out how ESO Fund can cover your taxes risk-free.

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