AMT Calculator
Simplified 2026 alternative minimum tax estimate: exemption after the 50% phase-out, 26%/28% tentative tax vs your regular tax.
IRS tax year 2026 tables (Rev. Proc. 2025-32) last updated · reference source
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Currency: Amounts are calculated in the currency you select; this site does not convert between currencies and does not use live exchange rates.
Dated static reference; no live data is fetched. Verify current source values and assumptions before relying on results.
What this tool does
A simplified run at the 2026 alternative minimum tax on Form 6251. You enter AMTI — regular taxable income with AMT preferences and adjustments added back — and your regular tax. The tool applies the 2026 exemption ($90,100 single / $140,200 joint), phases it out at 50 cents per dollar of AMTI over $500,000 ($1,000,000 joint) under the One Big Beautiful Bill Act reset, taxes the excess at 26% up to $244,500 and 28% above, and reports any excess over your regular tax as AMT owed.
How to use the AMT Calculator
- Enter your figures in the fields above.
- Check the filing status, state and pay-frequency selections — they change the tables used.
- Read the headline result first, then the breakdown: it shows exactly which tax or amount produced each line.
- Change any input to compare scenarios; the result updates with the same dated tables shown on this page.
Formula
exemption = max(0, full exemption − 50% × max(0, AMTI − phase-out start)); TMT = 26% × min(excess, $244,500) + 28% × remainder; AMT = max(0, TMT − regular tax)
- AMTI
- Taxable income recomputed under AMT rules — SALT added back, ISO bargain element included
Worked example
AMTI of $350,000 is below the $500,000 phase-out, so the full $90,100 exemption applies: tentative tax on $259,900 is $67,882, which exceeds the $45,000 regular tax by $22,882 of AMT.
Inputs
- Alternative minimum taxable income (AMTI)350000
- Regular federal tax (for comparison)45000
- Filing statusSingle
Result
- AMT owed (on top of regular tax)$22,882.00
- Tentative minimum tax$67,882.00
- AMT exemption allowed$90,100.00
- Taxable excess (AMTI − exemption)$259,900.00
AMT parameters, 2026
| Item | Single / HoH | Joint | Separate |
|---|---|---|---|
| Exemption | $90,100 | $140,200 | $70,100 |
| Phase-out starts | $500,000 | $1,000,000 | $500,000 |
| Phase-out rate | 50% | 50% | 50% |
| 26% breakpoint | $244,500 | $244,500 | $122,250 |
Results explained
- AMT owed (on top of regular tax)
- The amount by which tentative minimum tax exceeds regular tax — you pay the higher of the two systems in total.
- Tentative minimum tax
- 26%/28% applied to AMTI above the (phased-out) exemption.
Frequently asked questions
Most often: exercising incentive stock options, large state and local tax deductions (not allowed under AMT), private-activity bond interest, and — from 2026 — simply having AMTI over $500,000, where the exemption now phases out twice as fast.
The exemption rose to $90,100 / $140,200, but the phase-out thresholds reset down to $500,000 / $1,000,000 and the phase-out rate doubled from 25% to 50%, pulling more high earners back into AMT.
Not always. AMT paid on deferral items like ISO exercises creates a minimum tax credit that can offset regular tax in later years; AMT on exclusion items like SALT generally does not.
Alternative minimum taxable income: your income recomputed with AMT rules — standard deduction and SALT removed, ISO spread and other preferences added. Tax software derives it on Form 6251.
It is a screening estimate. Form 6251 keeps preferential capital-gains rates inside the AMT computation and handles credits and the foreign tax credit specially, so file with full software or a preparer.