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AMT Risk Calculator

Reviewed by Harsh Agarwal, EA (#00158482)

Description

The AMT Risk Calculator helps taxpayers assess their potential exposure to the Alternative Minimum Tax (AMT), a parallel tax system designed to ensure that high-income individuals who benefit from certain tax preferences pay at least a minimum level of federal income tax. While the Tax Cuts and Jobs Act of 2017 significantly reduced the number of taxpayers subject to AMT by increasing exemption amounts and phase-out thresholds, the AMT remains a real concern for certain taxpayer profiles — particularly those with large state and local tax deductions (SALT), significant incentive stock option (ISO) exercises, substantial long-term capital gains, tax-exempt interest from private activity bonds, or large miscellaneous deductions. This calculator estimates your AMT liability by computing your Alternative Minimum Taxable Income (AMTI), which starts with regular taxable income and adds back common AMT preference items and adjustments. The most significant AMT adjustments include the disallowance of the SALT deduction (which is already capped at $10,000 for regular tax purposes but fully disallowed for AMT), the addition of ISO bargain element spread (the difference between the exercise price and fair market value when you exercise incentive stock options), the inclusion of private activity bond interest, and various timing differences in depreciation calculations. After computing AMTI, the calculator applies the AMT exemption (which phases out at higher income levels) and the AMT tax rates (26% on the first $220,700 of AMT income above the exemption, 28% on the excess) to determine tentative minimum tax. AMT is owed only if the tentative minimum tax exceeds your regular tax liability. For cross-border taxpayers, the calculator addresses how the Foreign Tax Credit interacts with AMT and whether foreign taxes can offset AMT liability.

Input Fields

Regular Taxable Income

State and Local Tax Deduction

ISO Exercise Bargain Element

Private Activity Bond Interest

Filing Status

For accurate results, book a consultation with our tax professionals.

Formula Explanation

Alternative Minimum Taxable Income (AMTI) = Regular Taxable Income + SALT Deduction add-back + ISO Bargain Element + Private Activity Bond Interest + Other AMT adjustments. AMT Exemption is subtracted (phased out at higher incomes). Tentative Minimum Tax = 26% of AMTI above exemption up to approx $220,700 + 28% of excess. AMT owed = max(0, Tentative Minimum Tax - Regular Tax). AMT Credit may be generated from timing differences (like ISOs) for use in future years.

Example Calculation

Example: Single filer with $350,000 regular taxable income, $10,000 SALT deduction, and $50,000 ISO exercise spread. Step 1: Start with regular taxable income: $350,000 Step 2: Add back SALT deduction: +$10,000 Step 3: Add ISO bargain element: +$50,000 Step 4: AMTI = $410,000 Step 5: AMT exemption (2026 Single) approx $85,700, phased out at 25% of AMTI over $609,350 = no phase-out Step 6: AMTI minus exemption = $410,000 - $85,700 = $324,300 Step 7: AMT = 26% x $220,700 + 28% x ($324,300 - $220,700) = $57,382 + $28,988 = $86,370 Step 8: Regular tax on $350,000 approx $84,497 Step 9: AMT owed = $86,370 - $84,497 = $1,873 You would owe $1,873 in AMT, primarily triggered by the ISO exercise spread. An AMT credit of approximately $1,873 may be available in future years.

Important Disclaimers

This calculator provides a simplified estimate of AMT exposure based on the most common AMT preference items. Actual AMT calculations may involve additional adjustments including depreciation timing differences, passive activity loss adjustments, net operating loss limitations, and the interaction with the Foreign Tax Credit. The AMT exemption amounts and thresholds are adjusted annually for inflation. This tool is for preliminary risk assessment only and does not constitute tax advice. Consult a qualified tax professional for accurate AMT calculations, especially if you are exercising incentive stock options.

Frequently Asked Questions

Who is most likely to owe AMT in 2026?

Since the TCJA significantly increased AMT exemption amounts, far fewer taxpayers owe AMT than before 2018. However, you may still be at risk if you: (1) exercise incentive stock options with a large bargain element, (2) earn high income in a high-tax state (the SALT cap limits the regular tax deduction but the full amount is disallowed for AMT), (3) earn significant private activity bond interest, or (4) have large long-term capital gains combined with other AMT preferences. Our calculator helps you assess your specific risk profile.

What is the AMT credit and how does it work?

When you pay AMT due to timing differences (like ISO exercises), you may generate an AMT credit that can offset regular tax in future years. The credit is available when your regular tax exceeds your tentative minimum tax in a subsequent year. This means the AMT paid on ISO exercises is often recoverable — it's a timing difference, not a permanent extra tax. However, the credit can only be used to reduce regular tax, not below the tentative minimum tax, so recovery may take several years.

How do incentive stock options trigger AMT?

When you exercise an ISO, the bargain element — the difference between the fair market value of the stock on the exercise date and your exercise price — is not taxable for regular income tax purposes but is an AMT preference item. This means the spread must be added to your AMTI calculation, which can trigger AMT liability. For example, exercising ISOs with a $100,000 spread could add $100,000 to your AMTI. Careful planning around the timing and quantity of ISO exercises is essential to manage AMT exposure.