What Is the Alternative Minimum Tax (AMT)? 2026 Exemptions Explained

,000,000 (joint), and it now shrinks by 50 cents per dollar, twice as fast as before. The AMT rate is 26%, rising to 28% on AMT income above $244,500 after the exemption.

Those lower phase-out thresholds, set by the 2025 tax law, mean more high earners, especially people exercising incentive stock options, may owe AMT for 2026 than in recent years.

The Alternative Minimum Tax (AMT) is a separate tax system that runs parallel to the standard U.S. income tax system. Its original purpose was to prevent wealthy taxpayers from using numerous deductions and loopholes to reduce their tax liability to zero.

For most people, the AMT is something they never have to think about. However, the AMT's reach has expanded, and it can sometimes unexpectedly affect middle- and high-income taxpayers who live in high-tax states or have significant incentive stock options.

The AMT is a parallel tax system with its own rules. The exemption thresholds, the triggers most people hit, and how to tell if it applies to you.

How the AMT System Works

Think of the AMT as a "tax audit" that runs automatically when you file your return.

1. The Two Parallel Calculations

Every taxpayer potentially subject to the AMT must calculate their tax bill two ways:

• The Regular Tax: Calculated using the standard rules, deductions, and tax brackets (Form 1040).
• The AMT Calculation: Calculated using a separate set of rules that disallows certain common deductions (like state and local income tax, or the deduction for incentive stock options). This results in a higher figure called Alternative Minimum Taxable Income (AMTI).

2. The Final Tax Bill

The IRS demands that you pay whichever amount is higher—the Regular Tax or the Tentative Minimum Tax (the AMT calculation).

• Result: If your Tentative Minimum Tax exceeds your Regular Tax liability, you must pay the difference as the AMT.

Who Usually Pays the AMT?

The AMT primarily impacts taxpayers who meet two conditions: High Income and Large Disallowed Deductions.

1. High-Income Earners

The AMT is often triggered when a taxpayer's income reaches the point where their allowable deductions are phased out or limited under the regular tax system, but they still have a large amount of preference items (items disallowed by the AMT).

2. Taxpayers with "Preference Items"

The AMT takes away deductions that are permitted under the regular tax system.The most common "preference items" that trigger the AMT are:

• State and Local Taxes (SALT): This is a major trigger. Under the regular system, you can itemize and deduct up to $40,400 in state and local taxes for 2026 (less at high incomes). The AMT generally disallows this deduction entirely, raising your AMTI significantly if you live in a high-tax state (e.g., California, New York).
• Incentive Stock Options (ISOs): When you exercise ISOs, the difference between the stock's market price and the price you paid is not taxable under the regular system until you sell the stock. The AMT treats this "bargain element" as income immediately, which can push you into paying the AMT.
• Large Deductions: Deductions for certain investment-related interest or depreciation on certain assets may also be disallowed, contributing to a higher AMTI.

The Exemption and Phase-Out

To prevent the AMT from hitting lower-income taxpayers, the law provides an AMT Exemption.

The Exemption Amount (Varies Annually)

This is a fixed dollar amount of income that is shielded from the AMT. This exemption is substantial (e.g., $140,200 for married couples filing jointly in 2026), protecting most middle-class households.

The Phase-Out Rule

The exemption is not available to everyone. It begins to phase out (reduce to zero) once a taxpayer's income (AMTI) hits a certain level. For very high-income taxpayers, the exemption disappears entirely, making them much more likely to pay the AMT.

Conclusion: When to Seek Advice

For a beginner, the easiest rule of thumb is this: if you don't have significant income from incentive stock options and don't itemize large amounts of state and local taxes, you are unlikely to pay the AMT.

However, if your tax return involves large amounts of disallowed deductions or incentive stock options, the complexity makes professional advice essential. Tax software like TurboTax will automatically check for the AMT, but always review the final calculation to understand if the AMT is impacting your tax bill.