The 2026 AMT exemption is $90,100 (single) or $140,200 (joint), but phases out at a 50% rate starting at $500,000/$1,000,000 AMTI — twice as fast as before the OBBBA.
Incentive stock option exercises, disallowed SALT deductions, and private activity bond interest are the most common items that push taxpayers into AMT territory.
Planning strategies like spreading ISO exercises across years, making estimated quarterly payments, and reviewing municipal bond holdings can significantly reduce AMT exposure.
The Alternative Minimum Tax exists for one reason: to make sure high-income taxpayers cannot use deductions and exemptions to reduce their tax bill to zero. Think of it as a parallel tax system running alongside the regular income tax. You calculate your taxes both ways, and you pay whichever amount is higher. If the AMT exceeds your regular tax, you pay the difference as additional tax.
For 2026, the AMT landscape has shifted significantly. The One Big Beautiful Bill Act (OBBBA) made the higher exemption amounts permanent — good news — but simultaneously doubled the phaseout rate from 25% to 50%, which means the exemption disappears much faster as your income climbs. The net effect: more upper-middle-income earners could find themselves subject to AMT than in recent years.
This guide walks you through exactly how the AMT works in 2026, who is most likely to owe it, and how to calculate your exposure. Whether you are exercising stock options, earning above $500,000, or simply trying to understand your tax situation, the mechanics below will give you a clear picture.
What Is the AMT and Why Does It Exist?
2026 AMT Exemptions and Phaseouts
2026 AMT Exemption Phaseout Thresholds
If your AMTI falls between the phaseout start and the complete phaseout, you lose exemption dollar-for-dollar at 50 cents on the dollar. For a single filer at $600,000 AMTI, the calculation would be: $600,000 minus $500,000 equals $100,000 excess, times 50% equals $50,000 reduction, leaving an exemption of $40,100 ($90,100 minus $50,000).
AMT Tax Rates for 2026
AMT vs Regular Tax Rate Structure
The combination of these rates with the faster phaseout means that taxpayers in the $500,000 to $700,000 income range face an effective marginal AMT rate higher than 28%. Why? Because each additional dollar of income not only gets taxed at the AMT rate but also reduces your exemption by $0.50 — and that lost exemption amount is itself subject to AMT. The effective marginal rate in the phaseout zone can reach roughly 35%.
Worked Example: Single Filer With ISOs
Who Is Most Likely to Pay AMT in 2026?
Planning Strategies to Minimize AMT
Conclusion
The Alternative Minimum Tax in 2026 is a narrower but sharper tool than it once was. The OBBBA's permanent higher exemptions keep most middle-income earners out of the AMT entirely, but the doubled 50% phaseout rate means that those who do cross the threshold face steeper consequences. If your AMTI lands between $500,000 and $680,200 as a single filer — or between $1,000,000 and $1,280,400 filing jointly — you are in the zone where the AMT is most likely to bite.
The single best defense is awareness. Run a projection before year-end, especially if you are exercising stock options, earning income in a high-tax state, or holding private activity bonds. The AMT is not a penalty — it is a parallel system with its own logic. Once you understand that logic, you can plan around it.
Disclaimer: This content is for informational purposes only and does not constitute financial advice. Consult qualified professionals before making investment decisions.
The AMT was originally designed in 1969 after Congress discovered that 155 wealthy households paid zero federal income tax despite earning substantial incomes. The fix was a separate, simpler tax calculation that strips away many deductions and applies its own rates.
Here is the core idea: you start with your regular taxable income, then add back certain deductions and preference items that the AMT does not allow. The result is your Alternative Minimum Taxable Income (AMTI). You subtract the AMT exemption, apply the AMT tax rates, and compare that figure to your regular tax. If the AMT is higher, you pay the excess.
The deductions most commonly added back include:
State and local tax (SALT) deductions — entirely disallowed under AMT
Incentive stock option (ISO) spreads — the difference between exercise price and fair market value counts as AMT income
Private activity bond interest — tax-exempt under regular tax but taxable under AMT
Certain miscellaneous deductions that reduce regular taxable income
Under the OBBBA, the SALT deduction cap was raised to $40,000 for regular tax purposes, but it phases out by 30% for taxpayers with modified adjusted gross income above $500,000. Under the AMT, however, SALT deductions are not allowed at all — which is one of the primary reasons high earners in high-tax states trigger AMT liability. For more on how regular federal tax brackets interact with your overall tax picture, see our breakdown of the 2026 rates.
The AMT exemption is the amount of AMTI you can earn before the AMT rates kick in. For 2026, the exemptions are:
Single filers: $90,100
Married filing jointly: $140,200
These are the permanent, inflation-adjusted amounts locked in by the OBBBA. Before that legislation, there was uncertainty about whether exemptions would revert to much lower pre-TCJA levels.
However, the exemption is not available to everyone. It phases out as your AMTI rises:
Single filers: phaseout begins at $500,000 AMTI
Married filing jointly: phaseout begins at $1,000,000 AMTI
The critical change for 2026 is the phaseout rate. Under prior law, you lost $0.25 of exemption for every $1 of AMTI above the threshold. The OBBBA doubled that to $0.50 per $1 — a 50% phaseout rate. This means the exemption vanishes entirely at:
Single filers: $680,200 ($500,000 + $90,100 x 2)
Married filing jointly: $1,280,400 ($1,000,000 + $140,200 x 2)
The AMT uses just two tax rates, which is simpler than the seven brackets in the regular federal tax system:
26% on AMTI (after exemption) up to $244,500 ($122,250 for married filing separately)
28% on AMTI (after exemption) above $244,500
These rates apply to your AMTI minus your remaining exemption. While 26% and 28% sound lower than the top regular rate of 37%, remember that the AMT base is often much broader because it adds back deductions you normally take.
Let us walk through a concrete calculation. Meet Sarah, a single filer and software engineer in California.
Sarah's facts:
Salary: $350,000
California state income tax paid: $30,000
She exercised ISOs during 2026 with a spread (FMV minus exercise price) of $200,000
She did not sell the shares in the same calendar year
Step 1: Calculate regular taxable income
Salary: $350,000
Minus standard deduction: -$16,550
Regular taxable income: $333,450
Regular tax (approximate, using 2026 brackets): ~$80,400
Step 2: Calculate AMTI
Start with regular taxable income: $333,450
Add back: SALT deduction (not applicable — Sarah took standard deduction): $0
Add back: ISO spread (not sold same year): +$200,000
AMTI: $533,450
Step 3: Calculate AMT exemption
Base exemption: $90,100
AMTI excess over $500,000: $533,450 - $500,000 = $33,450
Exemption reduction (50%): $33,450 x 0.50 = $16,725
Remaining exemption: $90,100 - $16,725 = $73,375
Step 4: Apply AMT rates
AMT base: $533,450 - $73,375 = $460,075
First $244,500 at 26%: $63,570
Remaining $215,575 at 28%: $60,361
Tentative minimum tax: $123,931
Sarah owes an additional $43,531 in AMT, primarily because of the ISO exercise. This is a common scenario for tech employees who exercise stock options but hold the shares. If she had sold the shares in the same year she exercised (a disqualifying disposition), the spread would have been taxed as ordinary income under the regular tax and would not have triggered AMT. For related planning around equity compensation, our guide to capital gains tax rates and strategies covers the holding period rules.
Note that Sarah may be able to claim an AMT credit in future years when she sells the shares, partially recovering this cost. Planning the timing of ISO exercises is one of the most important tax decisions for equity-compensated workers — and one reason to consider estimated quarterly tax payments if you know AMT liability is coming.
The doubled phaseout rate under the OBBBA reshapes who falls into the AMT net. The most exposed groups include:
1. Employees exercising incentive stock options. As Sarah's example shows, the ISO spread is the single most common AMT trigger for upper-middle-income earners. If you exercise ISOs and hold the shares, plan for AMT.
2. High earners in high-tax states. Even though the regular tax SALT cap is now $40,000, the AMT allows zero SALT deduction. A married couple in New York or California with $150,000 in state and local taxes loses that entire amount when calculating AMTI, potentially pushing them into AMT territory.
3. Taxpayers in the $500,000–$700,000 income range. The faster phaseout creates a "bulge" in effective rates here. Paradoxically, taxpayers above $700,000 may be less affected because their regular tax is already high enough to exceed the AMT.
4. Holders of private activity municipal bonds. The interest from these bonds is tax-free for regular tax but counts as an AMT preference item. If you hold significant positions in private activity bonds, check your AMT exposure.
5. Taxpayers with large miscellaneous deductions. While the TCJA and OBBBA eliminated many miscellaneous deductions, certain items that still reduce regular tax may not reduce AMTI.
If you fall into one of these groups, it is worth running a projection before year-end. Strategies like tax-loss harvesting can help reduce your overall tax burden but will not directly reduce AMT liability — capital gains are taxed the same under both systems. Tax-advantaged accounts like an HSA, however, reduce both regular income and AMTI.
You cannot avoid the AMT entirely if your income profile triggers it, but you can manage the timing and magnitude:
Spread ISO exercises across tax years. Instead of exercising all your options in one year, exercise smaller batches annually to keep each year's AMT impact below the threshold where it exceeds your regular tax.
Consider same-year sales for ISOs. A disqualifying disposition (selling the shares in the same calendar year you exercise) converts the spread into ordinary income taxed under the regular system. You lose the favorable long-term capital gains treatment but avoid AMT entirely on that spread.
Time large deductions carefully. Since SALT deductions do not help you under AMT, bunching other deductions into years when you are not in AMT territory can be more efficient.
Review your municipal bond holdings. Swap private activity bonds for general obligation bonds if the after-tax yield is comparable. General obligation bond interest is exempt under both regular tax and AMT.
Make estimated tax payments. If you know you will owe AMT, avoid underpayment penalties by making estimated quarterly payments that account for the additional liability.
Claim the AMT credit carryforward. If you paid AMT in a prior year due to timing items like ISOs (as opposed to permanent items like SALT), you may have a minimum tax credit that reduces your regular tax in future years. Check Form 8801.