Alternative Minimum Tax Explained for High Earners in 2026

The alternative minimum tax was written in 1969 to make sure a small number of very wealthy households paid something. It later spread to millions of upper-middle-income families, until the 2017 tax law raised the exemption so much that the number of AMT payers fell sharply. For most high earners the alternative minimum tax became a line on the return they never think about.

That changed a little in 2025. The tax law passed that summer kept the large exemption but reset the income level where it starts to disappear, and it made the phase-out steeper. Add a higher cap on state and local tax deductions, which the AMT does not honor, and a startup employee exercising incentive stock options, and the AMT can reappear on a return that had been clean for years.

This guide explains how the calculation works, who is likely to owe it for 2026, what triggers it, and how to plan around it. It is educational and general, not advice for your specific return.

How the Alternative Minimum Tax Calculation Works

The AMT is a second tax calculation that runs alongside your regular one. You start with regular taxable income, add back certain deductions and preference items that the AMT does not allow, and arrive at alternative minimum taxable income, or AMTI. From that you subtract the AMT exemption. What is left is taxed at 26 percent up to a breakpoint that the IRS adjusts each year, currently in the mid $200,000s, and 28 percent above it. Long-term capital gains and qualified dividends keep their preferential rates under both systems.

The result is called tentative minimum tax. If it is higher than your regular tax, the difference is your AMT and it is added to your bill. If it is lower, you owe nothing extra. The comparison happens on Form 6251, which most tax software runs automatically even if it prints nothing on the return.

In practice, the AMT catches people in a specific band. Below the exemption, the AMT calculation produces nothing. Far above the phase-out, regular tax rates of 35 and 37 percent exceed the 28 percent AMT rate, so regular tax wins. It is the middle, where the exemption is being phased out and the effective AMT rate climbs above 28 percent, that produces most AMT bills.

The AMT Exemption and Phase-Out for 2026

For 2026 the AMT exemption is $90,100 for single filers and $140,200 for married couples filing jointly, as published by the IRS in its annual inflation adjustments. Those amounts are similar to recent years. What changed is the phase-out.

Under the rules in place from 2018 through 2025, the exemption began to phase out at roughly $600,000 of AMTI for single filers and $1.25 million for joint filers, and it phased out at 25 cents per dollar. Beginning in 2026, the phase-out starts at $500,000 for single filers and $1,000,000 for joint filers, indexed for inflation going forward, and it phases out at 50 cents per dollar. For a joint filer, the exemption is fully gone once AMTI reaches about $1.28 million.

The faster phase-out matters because it raises the effective AMT rate in the phase-out band. Every extra dollar of AMTI in that range is taxed at 28 percent and also removes 50 cents of exemption, which is taxed at 28 percent too. The effective marginal rate becomes 42 percent, which is higher than the 37 percent top regular rate. That is why a household earning between roughly $1 million and $1.3 million on a joint return should look closely at Form 6251 for 2026. The IRS overview of the tax is at Topic 556.

Who Still Pays AMT in 2026

Most wage earners with ordinary deductions will not owe AMT even at high incomes, because the regular tax on a large salary already exceeds the tentative minimum tax. The people who still pay tend to fall into a few groups.

• Employees who exercise incentive stock options and hold the shares past year-end, which creates a large AMT adjustment with no matching regular income.
• Households in the exemption phase-out band, roughly $500,000 to $700,000 single and $1 million to $1.3 million joint, especially when a large share of income is long-term capital gains that push AMTI up without generating much regular tax.
• Taxpayers with large state and local tax deductions. The regular tax now allows up to $40,000 of SALT deductions for many filers under the 2025 law, but the AMT allows none of it, so a big SALT deduction widens the gap between the two calculations.
• Investors with meaningful private activity municipal bond interest, which is tax-exempt for regular tax but counted for AMT.
• Business owners and real estate investors with accelerated depreciation, percentage depletion, or intangible drilling costs, which are recalculated under AMT rules.
• Anyone claiming a large foreign tax credit, which is limited differently under the AMT.

What no longer triggers AMT

Before 2018, the biggest AMT drivers were personal exemptions, miscellaneous itemized deductions, and unlimited state tax deductions. Personal exemptions and miscellaneous itemized deductions are gone, and SALT is capped. Those changes removed millions of households from the AMT and remain in place.

Incentive Stock Options and the AMT

When you exercise an incentive stock option and hold the shares, regular tax ignores the transaction. The AMT does not. The spread between the exercise price and the fair market value on the exercise date is added to AMTI as a preference item. Exercise 20,000 options at $2 when the shares are worth $30, and you add $560,000 to AMTI without receiving a dollar of cash.

This is the classic AMT trap, and it is worst for startup employees whose shares are illiquid. The tax is real and due the following April even if the shares cannot be sold. If the stock then falls, the AMT paid on paper gains that never materialized is recovered only slowly through the credit mechanism described below.

Planning usually involves exercising in tranches across several years, exercising early in the year so you can sell before December 31 if the price drops (a same-year sale converts the ISO to a disqualifying disposition and removes the AMT adjustment), and calculating the number of shares you can exercise each year before AMT kicks in. Our guides to stock option exercise strategy and the broader equity compensation tax rules cover the mechanics in more detail.

Finding the AMT crossover point

The crossover point is the amount of ISO spread you can absorb in a given year before tentative minimum tax exceeds regular tax. It depends on your salary, deductions, filing status, and other income. High regular tax from a large salary creates room for ISO exercises, because the AMT only bites when it exceeds regular tax. Modeling this in the fall, when your year-to-date income is mostly known, lets you exercise just up to the line rather than guessing.

The AMT Credit: Getting Your Money Back

AMT adjustments come in two types. Exclusion items, such as the SALT add-back, are permanent differences and generate no credit. Deferral items, such as the ISO spread and depreciation differences, are timing differences. Tax paid because of deferral items creates a minimum tax credit that carries forward indefinitely.

The credit is claimed on Form 8801 in any later year when your regular tax exceeds your tentative minimum tax. In that year, the credit reduces regular tax down to the AMT level, and any unused portion carries forward again. For someone who paid AMT on an ISO exercise and then sells the shares in a later year, the sale often produces exactly the regular-tax surplus that lets the credit be used.

Keeping track of the credit requires records. Your AMT basis in ISO shares is higher than your regular basis, because the spread was already taxed under AMT. When you sell, the AMT gain is smaller than the regular gain, and Form 6251 that year reflects the difference. Losing these records, which happens often when people change preparers, can mean leaving a large credit unclaimed.

Planning Around the Alternative Minimum Tax

The AMT rewards attention to timing more than any other part of the individual tax code. Since the tax is the difference between two calculations, moves that raise regular tax or lower AMTI both help.

• Run a projection each fall that includes any planned ISO exercises, bonus timing, and capital gains. The crossover point is only knowable with real numbers.
• Split large ISO exercises across two or more calendar years, and consider exercising in January so you have a full year to decide whether to hold.
• In a year you are already in AMT, accelerating ordinary income such as a Roth conversion or a bonus can be cheaper than usual, because that income is taxed at 26 or 28 percent under AMT rather than 35 or 37 percent. The math has to be checked, since it can also erode the exemption.
• In a year you are not in AMT but close to it, defer state estimated tax payments and property taxes to the following January if possible, since they provide no AMT benefit anyway.
• Check whether your municipal bond funds hold private activity bonds. Many general funds do, and the interest counts for AMT.
• If you hold ISO shares that have fallen sharply in value since exercise, evaluate a sale before December 31 of the exercise year, which can eliminate the AMT adjustment entirely.

AMT and Georgia state taxes

Georgia does not have a state alternative minimum tax. Georgia starts from federal adjusted gross income and applies its own flat rate, so a federal AMT bill does not create a state one. That said, the interaction runs the other way: Georgia income tax paid is part of the SALT deduction that the federal AMT disallows, which is one reason the SALT cap and itemizing rules belong in the same planning conversation.

The alternative minimum tax is no longer the broad annoyance it was before 2018, but it has not gone away, and the 2026 phase-out changes give it new reach among high earners with equity compensation, large capital gains, or big state tax deductions. The good news is that it is predictable. A projection in the fall, a look at Form 6251 before any large ISO exercise, and careful records of the AMT credit are usually enough to keep it from being a surprise. If your situation involves options, a liquidity event, or income near the phase-out band, that is the kind of work our tax planning service does alongside your CPA.

Tony Colunga · Founder, Attend Wealth

Tony leads Attend Wealth, a fee-based wealth management firm in Atlanta serving professionals, families, physicians, and business owners. Advisory services are held to a fiduciary standard. More about Attend