Alternative Minimum Tax (AMT) 2026: Who Pays It and How to Avoid It

The Alternative Minimum Tax (AMT) is a parallel tax system designed to ensure high-income taxpayers can’t use deductions and preferences to reduce their tax bill to near zero. But thanks to large inflation-indexed exemptions introduced by the Tax Cuts and Jobs Act, the AMT affects far fewer people today than it did a decade ago.

AMT Basics: Two Tax Systems, You Pay the Higher One

Every taxpayer effectively calculates their liability under two systems:

1. Regular tax system: Standard rates using familiar brackets, with all normal deductions
2. AMT system: Alternative calculation that adds back certain “preferences” and uses a flat rate structure

You pay whichever produces the higher tax. If your regular tax exceeds your tentative minimum tax (TMT), AMT doesn’t apply. If your TMT is higher, you pay the difference as AMT on top of your regular tax.

2026 AMT Parameters

Parameter	2026 Amount
AMT exemption — Single	$89,075
AMT exemption — Married Filing Jointly	$138,500
AMT exemption — Married Filing Separately	$69,250
AMT rate — income up to $232,600	26%
AMT rate — income above $232,600	28%
Exemption phaseout begins — Single	$626,350
Exemption phaseout begins — MFJ	$1,252,700
Exemption phases out at (per $1 over threshold)	$0.25 reduction

The exemption phases out at 25 cents per dollar above the phaseout threshold, meaning the full exemption is eliminated once income exceeds approximately $983,000 (single) or $1,807,000 (MFJ).

What Counts as AMT Income (AMTI)

To calculate AMT, you start with your regular taxable income and make the following adjustments:

Items Added Back Under AMT

Add-Back Item	Why It Matters
ISO spread at exercise	The difference between FMV and exercise price is a preference item
State and local tax deduction (SALT)	SALT is not deductible under AMT at all
Standard deduction	Not allowed under AMT (if you itemize, no add-back needed)
Certain miscellaneous deductions	Subject to add-back
Accelerated depreciation on property	Difference between regular and AMT depreciation
Private activity bond interest	Tax-exempt under regular tax but a preference item
Percentage depletion excess	Oil/gas depletion above cost basis

Items That Remain Deductible Under AMT

• Mortgage interest on a primary or secondary home (acquisition debt)
• Charitable contributions
• Casualty losses
• Business deductions (Schedule C, Schedule E active losses)
• Medical expenses above 7.5% AGI

How to Calculate Your Tentative Minimum Tax

Step-by-step:

1. Start with your regular taxable income
2. Add back AMT preference items and adjustments (as above)
3. This gives you AMTI (Alternative Minimum Taxable Income)
4. Subtract the applicable AMT exemption
5. Apply the AMT rate: 26% up to $232,600; 28% above
6. This is your Tentative Minimum Tax (TMT)
7. If TMT > regular tax liability, you owe AMT = TMT − regular tax

Example: Single filer with ISO exercise

Item	Amount
Regular taxable income	$120,000
ISO spread (add-back)	$80,000
SALT add-back	$10,000
AMTI before exemption	$210,000
Less AMT exemption	−$89,075
AMT base	$120,925
Tentative Minimum Tax (26%)	$31,440
Regular income tax	$21,356
AMT owed (difference)	$10,084

Without the ISO exercise, this taxpayer’s $120,000 income would have produced an AMT base of only $40,925 ($120,000 + $10,000 SALT − $89,075 exemption), a TMT of $10,640 — likely less than regular tax, so no AMT.

The ISO Option Problem

Incentive Stock Options are the most common AMT trigger for regular employees today. When you exercise ISOs:

• Regular tax: No taxable income at exercise (tax deferred until you sell the shares)
• AMT: The spread (FMV − exercise price) is immediately added to AMTI

Example: Exercise ISOs to buy 10,000 shares at $5/share when FMV is $20/share.

• Spread = ($20 − $5) × 10,000 = $150,000 AMT preference item
• This alone, added to normal income, can push someone into significant AMT territory

Planning strategy: Model the ISO exercise across multiple years, exercise some options in lower-income years, or sell shares in the same year as exercise (a “disqualifying disposition” — eliminates the AMT preference but converts gains to ordinary income).

Who Still Pays AMT in 2026

Despite the high exemptions, AMT still affects:

Taxpayer Type	Why AMT Applies
ISO stock option exercisers	ISO spread is a large preference item
Very high earners (>$1M income)	Exemption fully phased out
High SALT taxpayers with other large preferences	SALT add-back plus other items
Private activity bond investors	Bond interest added back
Accelerated depreciation users	Real estate and business property

Most taxpayers who are NOT affected: Single earners under $300,000 with straightforward W-2 income, standard mortgage, moderate charitable deductions, and no ISOs.

AMT Credit: Recovering Prior-Year AMT

If you paid AMT in a prior year due to timing differences (like ISO exercises, where income is recognized later under regular tax), you may be eligible for the Minimum Tax Credit (MTC).

The MTC is reported on Form 8801 and can be carried forward indefinitely. It becomes usable in years when your regular tax exceeds your TMT — essentially the IRS giving back AMT you paid early.

Key rule: The MTC only applies to AMT from deferral items (ISOs, accelerated depreciation). AMT from exclusion items (like SALT disallowance) does not generate a credit.

Checking Your AMT Exposure

The IRS requires you to complete Form 6251 (AMT for individuals) if any of the following apply:

• You claim accelerated depreciation
• You exercised ISOs
• You have tax-exempt income from private activity bonds
• You claim the standard deduction but have high income

Most tax software calculates this automatically. If you’re planning an ISO exercise or a large asset sale, run the AMT calculation before the transaction so you can see the exact impact.

Use the paycheck calculator to model your total federal tax liability and check whether your situation may trigger AMT with a tax professional.

What is the AMT exemption for 2026?

The 2026 AMT exemption is $89,075 for single filers and $138,500 for married filing jointly. These exemptions phase out at $626,350 (single) and $1,252,700 (married). The exemption was made permanent and inflation-indexed by the Tax Cuts and Jobs Act, which is why the AMT now affects far fewer taxpayers than it did before 2018.

What triggers the Alternative Minimum Tax in 2026?

Common AMT triggers include: exercising Incentive Stock Options (ISOs) — the spread between exercise price and market value is an AMT preference item; large state and local tax deductions (SALT is not deductible under AMT); certain accelerated depreciation deductions; tax-exempt interest from private activity bonds; and high miscellaneous itemized deductions. High income alone rarely triggers AMT for most taxpayers due to the large exemption.

Who actually pays AMT in 2026?

Thanks to the high exemption amounts, most middle-class taxpayers do not owe AMT. The AMT primarily affects upper-middle to high-income earners who: exercise large Incentive Stock Options (ISOs), live in high-tax states with large SALT deductions, or have substantial tax preference items. Roughly 200,000–300,000 taxpayers pay AMT annually, down from ~5 million before the TCJA.

How is AMT calculated?

AMT is calculated by starting with your regular taxable income, adding back certain deductions and “preference items” to get Alternative Minimum Taxable Income (AMTI), subtracting the AMT exemption, then applying the AMT rate (26% on income up to $232,600; 28% above). You pay the higher of your regular tax or your tentative minimum tax.

Can I claim a credit for AMT I paid in a prior year?

Yes. AMT paid due to timing differences (like ISO exercises) can generate a Minimum Tax Credit (Form 8801). This credit can be carried forward indefinitely and applied against your regular tax in future years when your regular tax exceeds your tentative minimum tax — essentially recovering AMT paid in prior years.