AMT is a parallel tax calculation that disallows certain deductions allowed under the regular tax system You pay the HIGHER of your regular tax or your AMT — it functions as a tax floor TCJA raised AMT exemption amounts and phase-out thresholds, reducing the number of affected taxpayers Key items that trigger AMT: ISO exercises, state and local tax deductions, certain interest deductions

Exercising Incentive Stock Options creates an AMT adjustment equal to the spread (FMV minus strike price) This 'phantom income' can generate a massive AMT bill even though you haven't sold the shares or received cash The AMT paid on ISO exercises generates an AMT credit that can be recovered in future years Strategic exercise timing — spreading exercises across multiple years — can keep you below AMT thresholds

AMT Exemption and Phase-Outs

The AMT exemption shields a portion of AMTI (AMT taxable income) from the AMT calculation Exemption amounts are indexed for inflation — check IRS.gov for current year amounts The exemption phases out at 25 cents per dollar above the phase-out threshold Once fully phased out, the effective marginal AMT rate can exceed 35% in the phase-out zone

AMT paid due to 'timing' items (like ISO exercises) generates an AMT credit carryforward The credit is usable in future years when your regular tax exceeds your tentative AMT Selling ISO shares at a gain can help recover prior AMT credits since the regular tax gain is higher Credits can carry forward indefinitely but recovery may take several years depending on income patterns

Model ISO exercises before executing — calculate the AMT impact at various exercise quantities Spread large ISO exercises across multiple tax years to stay within or just at the AMT exemption Consider exercising ISOs in years with lower regular income to minimize the AMT differential Accelerate income into AMT years (when you're already paying AMT, additional income may be taxed at a lower marginal rate)

AMT planning is critical for anyone exercising ISOs — the cash tax impact can be enormous Spreading ISO exercises across years is often the most effective AMT mitigation strategy AMT credits from ISO exercises are recoverable but require active planning to reclaim efficiently Work with a tax advisor to model AMT exposure before exercising options or making other AMT-sensitive decisions

Alternative Minimum Tax (AMT) Planning

Curated by: Rubric Advisors

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How AMT Works

AMT is a parallel tax calculation that disallows certain deductions allowed under the regular tax system
You pay the HIGHER of your regular tax or your AMT — it functions as a tax floor
TCJA raised AMT exemption amounts and phase-out thresholds, reducing the number of affected taxpayers
Key items that trigger AMT: ISO exercises, state and local tax deductions, certain interest deductions

ISOs and AMT

Exercising Incentive Stock Options creates an AMT adjustment equal to the spread (FMV minus strike price)
This 'phantom income' can generate a massive AMT bill even though you haven't sold the shares or received cash
The AMT paid on ISO exercises generates an AMT credit that can be recovered in future years
Strategic exercise timing — spreading exercises across multiple years — can keep you below AMT thresholds

Planning Strategies

Model ISO exercises before executing — calculate the AMT impact at various exercise quantities
Spread large ISO exercises across multiple tax years to stay within or just at the AMT exemption
Consider exercising ISOs in years with lower regular income to minimize the AMT differential
Accelerate income into AMT years (when you're already paying AMT, additional income may be taxed at a lower marginal rate)

Key Takeaways

AMT planning is critical for anyone exercising ISOs — the cash tax impact can be enormous
Spreading ISO exercises across years is often the most effective AMT mitigation strategy
AMT credits from ISO exercises are recoverable but require active planning to reclaim efficiently
Work with a tax advisor to model AMT exposure before exercising options or making other AMT-sensitive decisions

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How AMT Works

ISOs and AMT

AMT Exemption and Phase-Outs

AMT Credit Recovery

Planning Strategies

Key Takeaways

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How AMT Works

ISOs and AMT

AMT Exemption and Phase-Outs

AMT Credit Recovery

Planning Strategies

Key Takeaways

Related Topics

Bunching Charitable Deductions

Capital Gains Harvesting (0% Rate Strategy)

Equity Compensation Tax Strategy Checklist