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Part of the AMT calculation. After your AMT income (AMTI) is determined, it is reduced by an exemption amount to reach your amount of taxable AMTI in the complex AMT calculation. This AMT exemption replaces the personal exemption and standard deduction from the regular-tax system. This AMTI exemption amount is phased out for high-income individuals by 25 cents for every dollar of AMTI over specified thresholds. The net amount of AMTI is multiplied by the AMT rate to obtain the amount of AMT you owe.
2025 AMT income exemption amounts, phaseouts, and rate thresholds
Filer status in 2025 | AMT income exemption amount | Exemption amount phaseout starts | Exemption amount phaseout ends | Point where rate rises from 26% to 28% |
Single | $88,100 | $626,350 | $978,750 | $239,100* |
Joint | $137,000 | $1,252,700 | $1,800,700 | $239,100 |
* Married filing separately: $119,550