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What Is AMT? Alternative Minimum Tax Explained
The Alternative Minimum Tax is a parallel tax system that ensures high-income taxpayers pay a minimum amount. Here's how it works, who it affects.
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The Alternative Minimum Tax is a parallel tax system that ensures high-income taxpayers pay a minimum amount. Here's how it works, who it affects.
This guide is designed for first-pass understanding. Start with core terms, then apply the framework in your own account workflow.
The Alternative Minimum Tax is a parallel tax system that runs alongside the regular income tax. It was designed to prevent wealthy taxpayers from using too many deductions and credits to avoid paying taxes entirely. In practice, it catches a specific group of taxpayers — particularly high earners in high-tax states and employees exercising incentive stock options; and hits them with a surprise tax bill.
The AMT is a parallel tax calculation that adds back certain deductions (like state and local taxes and ISO stock option spreads) to your income and applies a flat 26-28% rate. You pay whichever is higher: your regular tax or the AMT. Under the Tax Cuts and Jobs Act (TCJA), higher exemption amounts significantly reduced the number of people affected, but the AMT still catches high earners in high-tax states and employees exercising incentive stock options.
The AMT was created in 1969 after Congress discovered that 155 high-income taxpayers had paid zero federal income tax by stacking deductions and exclusions. The idea was simple: create a floor; a minimum amount of tax that everyone above a certain income level must pay, regardless of their deductions.
The AMT recalculates your tax liability with a broader definition of income and fewer allowed deductions. If this recalculated tax is higher than your regular tax, you pay the difference as AMT. In effect, you always pay whichever is higher: your regular tax or the tentative minimum tax. The AMT is reported on Form 6251.
The AMT calculation follows these steps:
| Filing Status | 2024 | 2025 | 2026 |
|---|---|---|---|
| Single | $85,700 | $88,100 | ~$88,100 |
The AMT is a parallel tax calculation that adds back certain deductions and applies a flat 26-28% rate. You pay the higher of your regular tax or your AMT. It was designed to prevent wealthy taxpayers from using too many deductions to avoid taxes. The 2017 tax reform significantly reduced the number of people affected.
Post-2017 reform, AMT primarily affects high-income taxpayers ($200K-$1M) who exercise incentive stock options (ISOs), have large SALT deductions, or have significant miscellaneous deductions. The AMT exemption phases out at higher income levels, creating a 'AMT donut hole' in the $200-500K income range.
When you exercise ISOs, the spread between exercise price and fair market value is not taxed for regular tax purposes but IS added to income for AMT calculation. A large ISO exercise can trigger tens of thousands in AMT. Planning the timing and quantity of ISO exercises is critical.
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| Married Filing Jointly |
| $133,300 |
| $137,000 |
| ~$137,000 |
| Married Filing Separately | $66,650 | $68,500 | ~$68,500 |
The exemption phases out at higher income levels. For single filers, the phaseout begins around $609,350; for married filing jointly, around $1,218,700. Once phased out completely, your entire AMT income is subject to AMT rates.
Before the Tax Cuts and Jobs Act (TCJA) of 2017, the exemption amounts were much lower and the phaseouts started earlier, catching millions more taxpayers. The higher exemptions under current law (recently extended) have significantly reduced the number of people affected by the AMT. Check the IRS inflation adjustments for the latest figures.
These are the most common adjustments that increase your income under the AMT calculation:
The most notorious AMT situation involves incentive stock options. Here's a scenario that has caught thousands of tech employees:
You work at a startup and have ISOs with a $5 exercise price. The company's stock is now worth $50. You exercise 10,000 options, paying $50,000 for stock worth $500,000. Under regular tax, you owe nothing at exercise; the gain isn't taxed until you sell. But under the AMT, the $450,000 spread is added to your income. At a 28% AMT rate, that's $126,000 in AMT — a tax bill on income you haven't actually received as cash.
This is especially dangerous with pre-IPO stock that you can't easily sell. People have owed six-figure tax bills on paper gains that later evaporated when the stock price dropped. The dot-com bust created thousands of these situations. If you have ISOs, plan your exercises carefully. Consider exercising in smaller batches across multiple years to stay under the AMT threshold. Run AMT projections before exercising, not after.
Under current law (post-TCJA), the AMT affects a much smaller group than it used to. The people most likely to owe AMT are:
Here's a silver lining: if you pay AMT due to timing differences (like ISO exercises), you may be eligible for the AMT credit in future years. The AMT credit allows you to recover AMT paid in prior years when your regular tax exceeds your tentative minimum tax.
The credit works because many AMT adjustments are temporary timing differences, not permanent increases in tax. When you eventually sell the ISO stock and pay regular capital gains tax, the AMT you previously paid gets credited back. The credit can be carried forward indefinitely until fully used.
Tracking your AMT credit carryforward is important — it's easy to forget about, and tax software doesn't always carry it forward correctly if you switch programs. Keep your own records of AMT paid and credits used.
If you're at risk of AMT, consider these strategies:
The current higher AMT exemptions are part of the Tax Cuts and Jobs Act, which has recently been extended. These higher exemptions have kept millions of taxpayers out of the AMT since 2018. If exemptions ever revert to pre-TCJA levels without legislative action, millions more taxpayers could be pulled back into the AMT. Stay informed about potential tax law changes and plan accordingly.
Regardless of what happens legislatively, the AMT will remain relevant for ISO holders and high earners in high-tax states. It's a permanent feature of the tax code, not a temporary one.
The challenge with the AMT is that you often don't know you owe it until you've already made the decisions that triggered it. By the time you file your return, it's too late to undo an ISO exercise or change your income timing. Clarity helps you track your income, investment activity, and option exercises throughout the year so you can model your tax situation before making decisions — not after. Seeing your total picture across all accounts is the first step in avoiding AMT surprises.
If you have incentive stock options, find out your exercise price and the current fair market value. Calculate the bargain element (FMV minus exercise price times number of shares) and compare it to the AMT exemption amount. If exercising all your options would push the spread well above the exemption, plan to exercise in stages.
If you're a high earner in a high-tax state, check last year's return for Form 6251 (the AMT form). If you paid AMT or came close, work with a tax professional on a multi-year plan. Connect your accounts to Clarity to keep a real-time view of your income and investment activity, making it easier to project your tax liability throughout the year.
This article is for educational purposes and does not constitute tax advice. Consult a CPA or tax advisor for guidance specific to your situation.
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