Alternative Minimum Tax (AMT) Calculator 2025-2026
Determines if you owe AMT based on 2025-2026 exemption amounts and rates.
Use our free alternative minimum tax calculator to determine if you owe AMT for 2025-2026. This AMT calculator calculates AMTI, applies 2025-2026 exemptions ($88,100 single, $137,000 married), and computes tentative minimum tax. Enter taxable income and filing status for results.
e.g., ISO exercise spread, tax-exempt interest, etc.
The calculator first calculates your Alternative Minimum Taxable Income (AMTI) by adding tax preference items to your regular taxable income. It then applies the 2025-2026 AMT exemption ($88,100 single, $137,000 married) with phaseout reductions for high earners. The AMT base is calculated by subtracting the exemption from AMTI. Finally, it computes the tentative minimum tax using AMT rates: 26% on the first $239,100 and 28% on amounts above that threshold. You only pay AMT if this tentative minimum tax exceeds your regular tax liability.
AMTI: AMTI = Regular Taxable Income + Tax Preference Items
Exemption Phaseout: Excess = max(0, AMTI - Phaseout Threshold). Reduction = Excess × 0.25. Exemption = Base Exemption - Reduction (minimum $0)
AMT Base: AMT Base = AMTI - Exemption
Tentative AMT: Tentative AMT = (min(AMT Base, $239,100) × 0.26) + (max(0, AMT Base - $239,100) × 0.28)
AMT Owed: AMT = max(0, Tentative AMT - Regular Tax)