Alternative minimum tax (AMT)

The AMT is a parallel tax computed on Form 6251: add back items like state and local taxes and ISO bargain elements to reach AMTI, subtract the 2025 exemption ($88,100 single / $137,000 joint, phased out above $626,350 / $1,252,700), and apply 26%/28% rates; you pay the excess over regular tax.

Updated 2026-09-23 · 4 sources · By the EnrolledAgentKit team
Exam part
Part 1
Individuals
IRS domain
Taxation
15 of 85 scored Qs
Tax year tested
2025
2026-27 SEE
Practice questions
11
10 free below

The rules the exam tests

Figures for tax year 2025, the year the 2026-27 SEE tests. Verify against the cited primary source.
RuleWhat it says (2025)Source
Exemption (2025)$88,100 single; $137,000 MFJ; $68,500 MFSRev. Proc. 2024-40
Exemption phase-out25% of AMTI over $626,350 single / $1,252,700 MFJRev. Proc. 2024-40
Rates26% up to $239,100 of AMTI over exemption ($119,550 MFS); 28% aboveIRC 55(b)
Common adjustmentsSALT, standard deduction, ISO spread, some depreciation (150% DB)IRC 56
PreferencesSpecified private activity bond interest, certain depletionIRC 57
Not adjustedQualified acquisition mortgage interest, charitable gifts, bonus depreciationForm 6251 instructions
Minimum tax creditOnly AMT from deferral items; carried forward on Form 8801IRC 53
Worked example

Facts: Single filer, 2025. Regular taxable income $300,000 after itemizing with $40,000 of SALT; exercised ISOs with a $150,000 spread and held the shares.

AMTI: $300,000 + $40,000 SALT + $150,000 ISO = $490,000. Below the $626,350 phase-out, so the exemption is the full $88,100. AMT base $401,900: 26% x $239,100 + 28% x $162,800 = $62,166 + $45,584 = $107,750 tentative minimum tax (ignoring preferential capital gain rates). AMT = excess over regular tax. The ISO portion is a deferral item that can generate a minimum tax credit later.

Exam traps

  • The standard deduction is not allowed for AMT.
  • SALT add-back creates AMT but no minimum tax credit (exclusion item).
  • Bonus depreciation is allowed for AMT; 200% DB on personal property is not (150% DB).
  • Qualified dividends and LTCG keep their 0/15/20% rates inside AMT.

Alternative minimum tax (AMT): 10 free practice questions

Alternative minimum tax (AMT) practice questions

What is the 2025 AMT exemption amount for a married couple filing jointly?

Drill every Part 1 topic

The full bank has 300 original Part 1 questions (900 across all parts) weighted to the IRS domains. $149 once, free extension until you pass.

Get all 3 parts - $149

Frequently asked questions

What triggers the AMT?

Large SALT deductions, ISO exercises, private activity bond interest and big depreciation differences are the usual causes.

What is the AMT exemption for 2025?

$88,100 for single filers and $137,000 for joint filers.

Sources

  1. IRS - Instructions for Form 6251 (Alternative Minimum Tax) (accessed 2026-09-23)
  2. IRS Rev. Proc. 2024-40 - 2025 inflation adjustments (accessed 2026-09-23)
  3. IRS - SEE Part 1 content specifications (Individuals) (accessed 2026-09-23)
  4. IRS - Enrolled agents: Frequently asked questions (accessed 2026-09-23)