Alternative Minimum Tax (AMT) Calculator (2026)
Estimate your 2026 AMT liability on Form 6251. Models the exemption phase-out above $500k Single / $1M MFJ, the 26%/28% rate split at $248,300, and the ISO bargain element that most often triggers AMT for tech employees.
Guidance, not advice. This calculator runs the rules as published, it doesn't assess your circumstances. Your actual tax may be affected by factors it doesn't cover (deductions, credits, filing status nuances, state-specific adjustments). Always seek financial or tax advice from a qualified CPA, Enrolled Agent, or tax attorney, or contact the IRS. Read our editorial scope →
Regular tax basis
Start with figures from Form 1040 (line 15 and line 16).
AMT is the EXCESS of tentative minimum tax over regular tax.
AMT preferences & adjustments
Items added back to compute AMTI under §56–§58.
Itemizers only — SALT is not deductible for AMT.
Otherwise tax-exempt PAB interest is an AMT preference.
MACRS vs ADS difference. Can be negative in later years.
Catch-all for items like incentive depletion, etc.
ISO exercise modeling
Bargain element = (FMV − strike) × shares held past year-end.
If you exercise ISOs and hold the shares past December 31, the bargain element is an AMT preference even though there is no regular-tax income. A same-year sale (disqualifying disposition) avoids the AMT hit.
No AMT owed
Tentative minimum tax − regular tax (floored at zero).
Marginal AMT rate at this income: 26% (rate steps from 26% to 28% at $248,300 AMT taxable income).