The Alternative Minimum Tax was created in 1969 after Congress discovered that 155 high-income households had used deductions and loopholes to pay zero federal income tax. The fix was a parallel tax system that limits certain deductions and credits, ensuring everyone above a threshold pays something. Today, the AMT primarily hits upper-middle-income earners — especially those in high-tax states like California, New York, and New Jersey, or tech workers exercising incentive stock options.
The AMT doesn’t replace the regular tax system. Instead, you calculate your tax liability under both the regular federal income tax brackets and the AMT rules, then pay whichever amount is higher. In practice, about 4 million taxpayers owe additional tax under the AMT each year, and the average additional liability is roughly $7,000 to $15,000.
2026 AMT Exemption Amounts
The AMT exemption is the amount of income shielded from the alternative minimum tax. Think of it like a large standard deduction that applies only within the AMT calculation. If your AMT income falls below your exemption amount, you won’t owe any AMT. These exemptions are indexed to inflation each year, and the 2026 tax changes brought modest increases.
| Filing Status | AMT Exemption | Phase-Out Begins | Phase-Out Complete |
|---|---|---|---|
| Single / Head of Household | $85,700 | $609,350 | $952,150 |
| Married Filing Jointly | $133,300 | $1,218,700 | $1,751,900 |
| Married Filing Separately | $66,650 | $609,350 | $875,950 |
The phase-out is where the AMT gets especially punishing. For every $1 of AMT income above the phase-out threshold, you lose 25 cents of your exemption. That means a single filer with AMT income between $609,350 and $952,150 effectively faces a higher marginal rate than the stated 26–28% because their exemption is shrinking simultaneously. By the time your income reaches the “Phase-Out Complete” column, you’ve lost the entire exemption and your full AMT income is taxable.
AMT Tax Rates
Unlike the regular tax system with its seven marginal tax brackets, the AMT uses just two flat rates. This simplicity is deceptive — because the AMT disallows so many deductions, the effective tax rate under the AMT can be higher than what you’d pay under regular rates even though the stated percentages look lower.
| AMT Taxable Income | AMT Rate |
|---|---|
| Up to $248,300 (MFJ) / $124,150 (Single) | 26% |
| Above $248,300 (MFJ) / $124,150 (Single) | 28% |
One important nuance: long-term capital gains and qualified dividends are still taxed at the preferential capital gains tax rates (0%, 15%, or 20%) under the AMT — they don’t get bumped up to 26% or 28%. This makes the AMT less of a concern for investors whose income is primarily from long-term gains and more of an issue for high-W2 earners with large deductions.
How AMT Is Calculated
The AMT calculation starts with your adjusted gross income and then diverges from the regular tax computation. You add back certain deductions and income items that are treated favorably under the regular tax code (called “preference items”), subtract your AMT exemption, and apply the AMT rates. Here’s the step-by-step process:
| Step | Action |
|---|---|
| 1 | Start with regular taxable income |
| 2 | Add back AMT “preference items” (see below) |
| 3 | Subtract AMT exemption |
| 4 | Apply AMT rates (26% / 28%) |
| 5 | Compare AMT to regular tax |
| 6 | Pay the higher amount |
If the AMT calculation produces a higher tax than your regular tax, you pay the difference as an additional tax liability on top of your regular tax. This additional amount is reported on IRS Form 6251. Most tax software handles this calculation automatically, but if you’re doing your own planning mid-year — especially around stock option exercises — running the numbers manually beforehand can save you from a nasty surprise at filing time.
AMT Preference Items (What Gets Added Back)
Preference items are the deductions and income exclusions that the AMT disallows or recalculates. Understanding these is the key to knowing whether you’re at risk. If you rely heavily on itemized deductions — particularly the state and local tax (SALT) deduction — or if you exercise incentive stock options, the AMT will hit you hardest.
| Item | Regular Tax Treatment | AMT Treatment |
|---|---|---|
| State/local tax deduction (SALT) | Deductible (up to $10,000 TCJA cap) | NOT deductible |
| Incentive stock option (ISO) exercise | Not taxed at exercise | Spread is taxable at exercise |
| Private activity municipal bond interest | Tax-exempt | Taxable for AMT |
| Standard deduction | Allowed | NOT allowed (before TCJA changes) |
| Home equity loan interest (non-home use) | Was deductible (pre-TCJA) | NOT deductible |
| Certain depreciation methods | Accelerated | Straight-line required |
| Mining exploration costs | Currently deductible | Must be spread over 10 years |
| Research and development costs | Currently deductible | Must be capitalized |
The #1 AMT trigger is incentive stock option exercise. The spread between exercise price and fair market value is AMT income.
The SALT deduction is the second-biggest trigger, especially for taxpayers in high-tax states. If you live in California, New York, or New Jersey and earn $200,000+, your state income tax alone can push you into AMT territory. Before the TCJA capped the SALT deduction at $10,000, this was the single largest AMT driver — millions of homeowners in high-tax states were caught. The $10,000 SALT cap actually reduced AMT exposure for many taxpayers because it brought regular tax treatment closer to AMT treatment. Check state income tax rates to see how your state’s taxes compare, or explore states with no income tax if relocation is a consideration.
Who Pays AMT?
The AMT disproportionately affects a specific income band. Taxpayers earning under $100,000 almost never owe it, and those earning above $1 million usually owe more under the regular system anyway (their regular tax rate is already 37%). The AMT’s real bite is in the $200,000–$500,000 range — especially for dual-income households in high-tax states or tech employees with stock options.
| Income Range | % Likely to Owe AMT | Primary Trigger |
|---|---|---|
| Under $100,000 | <1% | Very unlikely |
| $100,000-$200,000 | 2-3% | ISOs, large SALT |
| $200,000-$500,000 | 15-25% | ISOs, SALT, high state taxes |
| $500,000-$1,000,000 | 10-15% | Moderate (exemption phases out) |
| Above $1,000,000 | 5-8% | Regular tax usually higher |
The TCJA (2017 tax reform) dramatically reduced the number of AMT payers by:
- Raising the AMT exemption amount
- Capping SALT deduction at $10,000 (which effectively aligned regular tax with AMT)
Before the TCJA, roughly 5 million taxpayers owed AMT annually. The higher exemptions and SALT cap cut that number significantly. However, many TCJA provisions are set to expire or change — keep an eye on the 2026 tax changes for updates. If the SALT cap is lifted or the AMT exemption is reduced, AMT exposure could spike back up for millions of filers.
If you’re in the $200K–$500K income range and want to understand your full tax picture, try the tax bracket calculator or explore what your take-home pay actually looks like after federal, state, FICA, and potential AMT.
AMT and Stock Options (ISOs)
If you work in tech, this is the section that matters most. Incentive stock options (ISOs) are the single most common — and most painful — AMT trigger. When you exercise ISOs, there’s no regular income tax on the “spread” (the difference between your exercise price and the stock’s fair market value). But the AMT treats that spread as taxable income in the year of exercise.
This creates a dangerous scenario: you can owe tens of thousands in AMT on paper gains that you haven’t actually received as cash. If the stock price drops after you exercise, you still owe AMT on the spread at the time of exercise. This “phantom income” problem devastated many employees during the dot-com bust and again during market downturns. For a deeper dive on the tax mechanics of stock compensation, see the RSU tax guide and the stock options tax calculator.
| Scenario | Example |
|---|---|
| ISO exercise: 10,000 shares at $5 exercise, $25 FMV | Spread = $200,000 |
| Regular tax: $0 (no tax on ISO exercise) | $0 |
| AMT: $200,000 additional income | ~$52,000 AMT |
| If stock drops before year-end | Still owe AMT on phantom gain |
ISO AMT Strategies
The good news is that with proper planning, you can significantly reduce or avoid AMT from ISO exercises. The key is running the numbers before you exercise — not after. Many employees exercise a large block of options in a single year without realizing the AMT consequences until they file their return months later.
| Strategy | How It Works |
|---|---|
| Exercise + sell same year (disqualifying disposition) | Converts to ordinary income, no AMT issue |
| Exercise in January (for max time to sell) | Gives 23 months to hold for LTCG treatment |
| Spread exercises across years | Stay below AMT threshold each year |
| Calculate AMT before exercising | Know exact tax cost before committing |
| Exercise when stock price is low | Smaller spread = less AMT |
The “exercise and sell” strategy (disqualifying disposition) is the simplest way to avoid AMT entirely — but you give up the favorable long-term capital gains tax rates on future appreciation. If you believe the stock will appreciate significantly, the better approach is to exercise incrementally across multiple tax years, keeping each year’s spread below the AMT exemption threshold. For example, instead of exercising 10,000 shares in one year ($200,000 spread), exercise 2,500 shares per year ($50,000 spread each year) to stay well under the $85,700 single filer exemption.
If you owe estimated tax payments as a result of exercising ISOs, make sure to pay them quarterly to avoid underpayment penalties. The quarterly tax deadlines page has the current due dates.
AMT Credit
Here’s a silver lining that many taxpayers overlook: if you pay AMT due to “timing” items — primarily ISO exercises — you generate an AMT credit that can reduce your regular tax in future years. This credit exists because the AMT on timing items is essentially a prepayment of tax you’d eventually owe when you sell the stock. The IRS lets you recoup that prepayment over time.
| Feature | Details |
|---|---|
| What it is | Credit for AMT paid on “timing” items (like ISOs) |
| When you can use it | In years when regular tax exceeds AMT |
| How much | Dollar-for-dollar credit against regular tax |
| Carryforward | Indefinite — use in any future year |
| Refundable? | Partially (50% of unused credit refundable each year) |
The AMT credit can be substantial. If you paid $50,000 in AMT due to an ISO exercise, that full $50,000 becomes a credit you carry forward. In any future year where your regular tax exceeds your AMT, you can apply the credit to reduce your regular tax bill dollar-for-dollar. The credit carries forward indefinitely — there’s no expiration. And if you have unused credits that persist for years, the partial refundability rule lets you reclaim 50% of the unused amount each year regardless of your tax situation.
Many taxpayers forget about their AMT credit carryforward or switch tax preparers and lose track of it. Make sure your tax software or CPA carries the credit forward every year — it’s essentially free money you’ve already paid to the IRS.
Strategies to Minimize AMT
The best AMT strategy is proactive planning before year-end, not reactive scrambling at tax time. Because the AMT is driven by specific preference items, you can often control your exposure by timing income and deductions carefully.
| Strategy | Impact |
|---|---|
| Spread ISO exercises over multiple years | Stay under AMT exemption |
| Time SALT prepayments carefully | Don’t bunch in one year |
| Defer income to avoid AMT phase-out range | Keep below $609K (single) or $1.2M (MFJ) |
| Maximize AMT credit carryforward | Reduce regular tax in future years |
| Consider Roth conversions strategically | May trigger AMT but build tax-free assets |
| Harvest capital gains in AMT years | 0% AMT rate on some LTCG |
| Use TurboTax or tax professional | Model scenarios before year-end |
One underappreciated strategy is tax-loss harvesting in AMT years. Because long-term capital gains are taxed at preferential rates even under the AMT, an AMT year can actually be a good time to realize capital gains — your effective rate on those gains may be lower than in a non-AMT year. Conversely, harvesting losses is less valuable in an AMT year because the deduction may not reduce your AMT liability as much as it would reduce regular tax.
For self-employed individuals, the AMT can interact with self-employment tax in complex ways. Business deductions that reduce your regular tax may be limited under the AMT, so freelancers and business owners should model both systems carefully — especially if you’re also claiming the home office deduction or significant business tax deductions.
When to Consult a Tax Professional
While tax software handles the AMT calculation accurately, it can’t plan for you. If any of the following apply, consider working with a CPA or finding a CPA near you:
- You’re about to exercise stock options worth $50,000+ in spread
- You live in a high-tax state and earn over $200,000
- You have AMT credit carryforward from a prior year
- You’re considering a large Roth conversion
- You’re a business owner with complex depreciation schedules
The cost of a tax professional ($300–$1,000 for AMT planning) is almost always less than the cost of an unexpected AMT bill. Year-end tax planning sessions in October or November give you enough time to adjust ISO exercises, defer income, or accelerate deductions before December 31.
Related: Federal Income Tax Brackets | Capital Gains Tax Rates | Tax Deductions and Credits | How Tax Brackets Work | Tax Filing Status Guide