What is the Alternative Minimum Tax (AMT)?

The Alternative Minimum Tax (AMT) is a parallel tax system designed to ensure that high-income individuals, trusts, and estates pay a minimum amount of tax, even if they have many deductions or tax credits under the regular tax system. It was created to close tax loopholes for the wealthiest taxpayers.

Who is typically subject to the Alternative Minimum Tax?

AMT generally impacts high-income individuals and those with significant deductions for state and local taxes, large capital gains, or who exercise incentive stock options (ISOs). Taxpayers with incomes above the AMT exemption amounts may be liable.

How does the IntelCalculator Alternative Minimum Tax Calculator work?

Our calculator simplifies the process by allowing you to input your relevant financial data, such as income, deductions, and credits, to estimate your potential AMT liability. It helps determine if your tax under AMT rules is higher than your regular tax.

What types of income or deductions are treated differently under AMT?

For AMT purposes, certain deductions like state and local taxes, some interest expenses (e.g., on private-activity municipal bonds), and the bargain element of incentive stock options are often added back to your income.

Are the AMT tax rates different from regular income tax rates?

Yes, the AMT has its own set of tax rates, typically 26% and 28%, which apply to your Alternative Minimum Taxable Income (AMTI) after accounting for the AMT exemption amount.

Is the IntelCalculator Alternative Minimum Tax Calculator free to use?

Yes, IntelCalculator provides free online calculators and conversion tools, including the Alternative Minimum Tax Calculator, for educational, informational, and personal purposes.

What should I do if the calculator suggests I might owe AMT?

If the calculator indicates a potential AMT liability, it is recommended to consult with a qualified tax professional for personalized advice and accurate tax preparation, as the tools are for informational use only.

HomeFinanceAlternative Minimum Tax Calculator

Last updated: Jan 3, 2026

Alternative Minimum Tax Calculator

Module 01 · Exemption

AMT Exemption Calculator

Finds your 2026 AMT exemption after the OBBBA phase-out, which now erodes exemptions at 50 cents per dollar above a lower income threshold.

Filing status

Alternative Minimum Taxable Income (AMTI)

Line 4 of Form 6251. Use Module 02 below if you need to build this figure from your return.

Enter a valid AMTI amount of $0 or more.

2026 AMT Exemption

—

Base exemption (before phase-out)$0

This is the full statutory exemption for your filing status before any income-based reduction. It shields this much AMTI from tax entirely.

Phase-out reduction$0

Your AMTI above the threshold reduces the exemption at 50 cents per dollar under OBBBA. This is double the old 25% erosion rate.

Exemption retained0%

The share of your base exemption that survives the phase-out. At 0% your exemption is fully exhausted and all AMTI becomes taxable.

Fully phased-out at$0

Once AMTI reaches this level, the exemption hits zero and every additional dollar of AMTI is taxed at the 26% or 28% AMT rate.

Exemption retention gauge

Retained exemption Phased-out portion

Formula & methodology

Reduction = max(0, AMTI − Threshold) × 50%
Exemption = max(0, Base − Reduction)
2026 base exemptions: Single/HoH $90,100 · MFJ $140,200 · MFS $70,100. Phase-out thresholds: Single/HoH/MFS $500,000 · MFJ $1,000,000 (Source: OBBBA §70107, IRS Rev. Proc. 2025-32).

Expert commentary

Enter your AMTI and filing status to see a tailored read on your exemption exposure.

Module 02 · AMTI Build-Up

AMTI (Alternative Minimum Taxable Income) Calculator

Rebuilds your taxable income into AMTI by layering back the preference items and adjustments Form 6251 requires.

Filing status

Regular taxable income (Form 1040, line 15)

Enter a valid taxable income of $0 or more.

Deduction claimed on regular return

AMT disallows the standard deduction entirely, so it is added back here automatically when selected.

SALT deduction add-back

ISO bargain element

Private activity bond interest

Depreciation adjustment

Other AMT preference/adjustment items

Miscellaneous items such as incentive stock option carryovers, certain passive activity losses, or medical-expense floor differences.

Total AMTI

—

Component	Amount
Regular taxable income	$0
Standard deduction add-back	$0
SALT add-back	$0
ISO bargain element	$0
Private activity bond interest	$0
Depreciation adjustment	$0
Other preference items	$0
AMTI	$0

Total add-backs$0

The combined amount of preference items layered onto your regular taxable income. Larger add-backs widen the gap that can trigger AMT.

AMTI vs. taxable income0%

How much larger your AMT income base is compared to your regular taxable income base, expressed as a percentage increase.

AMTI build-up waterfall

Formula & methodology

AMTI = Taxable Income + Std. Deduction (if claimed) + SALT + ISO + PAB Interest + Depreciation Adj. + Other
Based on Form 6251, Part I, lines 1–4. Preference items are never subtracted, only added.

Analysis

Calculate to see how each preference item contributes to your AMT exposure.

Module 03 · ISO Exercise

ISO (Incentive Stock Options) AMT Calculator

Calculates the bargain element created when you exercise and hold incentive stock options — the single most common AMT trigger for tech employees.

Number of shares exercised

Strike (exercise) price / share

Fair market value / share

Filing status (for rate estimate)

Shares must be held past year-end (not sold in a disqualifying disposition) for the bargain element to count as an AMT preference.

ISO Bargain Element (AMT Preference)

—

Total exercise cost$0

The cash you pay to exercise the options, calculated as shares multiplied by the strike price.

Total fair market value$0

What the exercised shares are worth today at current fair market value, before any sale or discount.

Estimated AMT liability added$0

A rough estimate of extra AMT owed from this exercise alone, using the 26% or 28% AMT rate on the bargain element.

Spread as % of FMV0%

How large the paper gain is relative to today's value — a useful gauge of how sensitive your AMT bill is to a stock price drop.

Exercise value flow

Formula & methodology

Bargain Element = (FMV − Strike Price) × Shares
This spread is added to AMTI in the exercise year under IRC §56(b)(3), even though no cash from a sale has been received — the classic "phantom income" problem.

Expert commentary

Run the numbers to see how much phantom income this exercise could create.

Module 04 · SALT Add-Back

State and Local Tax (SALT) Add-Back Calculator

Recomputes taxable income without the SALT deduction — historically the single biggest AMT trigger for itemizers in high-tax states.

State & local income tax paid

Property tax paid

Other SALT (sales tax, vehicle tax, etc.)

Modified AGI (for 2026 SALT cap phase-down)

OBBBA raised the regular-tax SALT cap to roughly $40,400 for 2026, phasing down toward a $10,000 floor above about $505,000 of MAGI. None of it is deductible for AMT regardless of the cap.

SALT Add-Back for AMT

—

Total SALT paid$0

The sum of all state, local, property, and other deductible taxes you actually paid during the year, before any cap is applied.

2026 regular-tax SALT cap (post phase-down)$0

The maximum SALT you may deduct on your regular return this year after applying the OBBBA phase-down for higher-income filers.

SALT deducted on regular return$0

The lesser of your total SALT paid and your applicable cap — this is what actually reduces your regular taxable income.

Regular tax vs AMT: SALT deduction

Formula & methodology

Regular deduction = min(Total SALT, 2026 Cap)
AMT add-back = Regular deduction (fully disallowed)
Cap phase-down approximated as max($10,000, $40,400 − 30% × max(0, MAGI − $505,000)) per OBBBA §70120.

Expert commentary

Enter your SALT figures to see exactly how much of your regular-tax deduction disappears under AMT.

Module 05 · Head-to-Head

AMT vs Regular Tax Comparison Calculator

Runs both tax systems side-by-side on your numbers and shows exactly which one you owe — and by how much.

Filing status

Regular taxable income

AMTI

AMT foreign tax credit

Additional AMT Owed

—

System	Tax
Regular tax (2026 brackets)	$0
Tentative minimum tax (TMT)	$0
AMT exemption applied	$0
Total tax owed (higher of the two)	$0

System that governs—

The tax system that actually determines your liability this year. When AMT wins, you pay the AMT amount on top of your regular tax.

Effective AMT rate on the gap0%

The blended 26%/28% rate applied to the AMTI above your exemption, before subtracting any foreign tax credit.

Regular tax vs TMT slope comparison

Formula & methodology

TMT = 26%/28% × (AMTI − Exemption) − AMT FTC
AMT Owed = max(0, TMT − Regular Tax)
Regular tax computed using projected 2026 IRS Rev. Proc. 2025-32 marginal brackets.

Analysis

Calculate to see which system governs your 2026 liability.

Module 06 · Foreign Tax Credit

AMT Foreign Tax Credit Calculator

Computes the AMT-specific foreign tax credit limitation, which is calculated separately from your regular-tax FTC.

Tentative minimum tax before FTC

Foreign-source AMTI

Total AMTI

Foreign income tax paid

Allowed AMT Foreign Tax Credit

—

FTC limitation$0

The ceiling on your AMT foreign tax credit, based on the proportion of your AMTI that comes from foreign sources.

Unused foreign tax (carryover eligible)$0

Foreign tax paid beyond this year's limitation, which generally may be carried back one year or forward up to ten years.

FTC limitation funnel

Formula & methodology

Limitation = TMT × (Foreign AMTI ÷ Total AMTI)
Allowed FTC = min(Foreign Tax Paid, Limitation)
Per IRC §59 and Form 1116 (AMT version). The AMT FTC generally cannot reduce TMT below 90% under certain older rules; this tool uses the simplified current-law limitation.

Expert commentary

Enter your foreign-source figures to see how much of your foreign tax actually offsets AMT.

Module 07 · Phase-Out Mechanics

AMT Phase-Out Calculator

Visualizes exactly how your exemption shrinks as AMTI rises above the 2026 threshold, and how much income cushion remains.

Filing status

AMTI

Position in Phase-Out Zone

—

Distance to threshold$0

How much AMTI headroom remains before your exemption starts shrinking at all. A negative value means you are already inside the phase-out zone.

Phase-out zone width$0

The total span of AMTI over which your exemption erodes from full value down to zero, calculated at the 50% OBBBA rate.

Marginal cost of the next $1,000$0

Extra AMT created by the next $1,000 of AMTI while inside the phase-out zone, including the hidden effect of a shrinking exemption.

Exemption phase-out curve

Formula & methodology

Exemption(AMTI) = max(0, Base − 50% × max(0, AMTI − Threshold))
The marginal cost adds both the direct 26%/28% tax on the extra AMTI and the indirect tax caused by the exemption shrinking 50 cents per dollar while inside the zone.

Expert commentary

Calculate to see exactly where you sit on the 2026 phase-out curve.

Module 08 · Municipal Bonds

Private Activity Bond Interest Calculator

Calculates the tax-exempt municipal bond interest that must be added back for AMT purposes, even though it is federally tax-free for regular tax.

Private activity bond interest received

Total tax-exempt municipal interest received

Only the private-activity-bond portion is an AMT preference; ordinary governmental-purpose municipal bond interest is not.

Filing status (for rate estimate)

AMT Preference Add-Back

—

Share of muni interest affected0%

The proportion of your total tax-exempt interest that comes from private activity bonds and therefore loses its AMT exemption.

Estimated added AMT cost$0

A rough estimate of extra AMT this add-back alone creates, applying the 26% or 28% AMT rate to the affected interest.

Municipal interest flow to AMTI

Formula & methodology

AMT Add-Back = Private Activity Bond Interest
Under IRC §57(a)(5), interest on specified private activity bonds is a tax preference item added back in full when computing AMTI, net of any related bond premium amortization (not modeled here).

Expert commentary

Enter your bond interest figures to see the AMT impact of holding these municipal bonds.

Module 09 · Depreciation

Depreciation Adjustment Calculator (AMT vs Regular)

Compares regular-tax 200% declining-balance MACRS depreciation against the slower 150% declining-balance method required for AMT.

Asset cost basis

Property class (recovery period)

Current recovery year

Depreciation Adjustment (Add-Back)

—

Method	This year's deduction
Regular tax (200% DB MACRS)	$0
AMT (150% DB)	$0
Adjustment added to AMTI	$0

Cumulative gap through this year$0

The total difference between regular and AMT depreciation claimed so far. This gap fully reverses to zero by the end of the asset's recovery period.

Depreciation curve divergence

Formula & methodology

Adjustment = Regular Depreciation − AMT Depreciation
Uses IRS Pub. 946 half-year convention percentage tables for 200% DB (regular) and 150% DB (AMT) methods. Positive adjustments add to AMTI; the relationship reverses in later years as AMT depreciation catches up.

Expert commentary

Calculate to see how much this year's depreciation timing difference adds to AMTI.

Module 10 · Capital Gains

AMT Capital Gains Calculator

Since long-term capital gains keep the same preferential rate under AMT, this isolates the ordinary AMT income actually taxed at 26%/28%.

Filing status

Total AMTI

Net long-term capital gains + QDI

Capital gains rate

Ordinary AMT Base (taxed at 26%/28%)

—

Component	Amount
Total AMTI	$0
Less: AMT exemption	$0
Less: capital gains / QDI	$0
Ordinary AMT base	$0
Tax on ordinary base (26%/28%)	$0
Tax on capital gains (preferential)	$0
Total tentative minimum tax	$0

AMTI composition by tax treatment

Formula & methodology

Ordinary Base = max(0, AMTI − Exemption − Capital Gains)
TMT = 26%/28% × Ordinary Base + Cap Gains Rate × Capital Gains
Mirrors the Part III "Tax Computation Using Maximum Capital Gains Rates" worksheet on Form 6251.

Analysis

Calculate to see how much of your AMTI is actually exposed to the 26%/28% rates versus preferential capital gains rates.

Module 11 · Minimum Tax Credit

AMT Credit Carryforward Calculator

Tracks the Minimum Tax Credit (MTC) generated by AMT you paid in prior years and projects when you can use it to offset future regular tax.

Prior-year MTC carryforward

AMT paid this year

Only the portion attributable to timing/deferral preferences (e.g. ISO exercises) generates credit; permanent preferences like SALT do not.

Next year's projected regular tax

Next year's projected TMT

Ending MTC Carryforward

—

Total credit pool available$0

Your prior carryforward plus this year's newly generated AMT credit — the total balance you can draw on going forward.

Usable next year$0

The amount of credit you can apply next year, limited to the excess of your regular tax over next year's TMT.

Years to fully exhaust (projected)—

A straight-line estimate of how many years it will take to use up the full credit pool at next year's projected usage rate.

Multi-year credit balance projection

Formula & methodology

Usable = min(Credit Pool, max(0, Regular Tax − TMT))
Ending Carryforward = Credit Pool − Usable
The Minimum Tax Credit under IRC §53 never expires and can be carried forward indefinitely until fully used.

Analysis

Calculate to project how many years it will take to recover your AMT credit.

Module 12 · Rate Bracket

26%/28% AMT Bracket Threshold Calculator

Determines whether your next dollar of AMTI is taxed at the 26% or 28% AMT rate, and how much income sits in each band.

Filing status

AMTI

Marginal AMT Rate

26%

—

AMTI above exemption$0

The portion of your AMTI that is actually subject to AMT rates, after subtracting your 2026 exemption amount.

Taxed at 26%$0

The slice of your excess AMTI that falls in the lower 26% band, up to the $244,500 breakpoint (or $122,250 if married filing separately).

Taxed at 28%$0

The slice of your excess AMTI above the breakpoint, taxed at the higher 28% AMT rate.

Blended effective AMT rate0%

Your total tentative minimum tax divided by total excess AMTI — the true average rate across both bands combined.

AMT rate ladder

Formula & methodology

Excess = max(0, AMTI − Exemption)
Tax = 26% × min(Excess, $244,500) + 28% × max(0, Excess − $244,500)
2026 breakpoint per IRC §55(b)(1), indexed by IRS Rev. Proc. 2025-32 ($122,250 for married filing separately).

Expert commentary

Calculate to see exactly where your AMTI sits on the two-tier AMT rate ladder.

Important Notice

Disclaimer This calculator is for informational purposes only and does not constitute Professional advice. Consult a licensed advisor before making decisions.

A comprehensive, step-by-step resource for understanding, calculating, and navigating the Alternative Minimum Tax system during the 2025 and 2026 tax years.

What Is the Alternative Minimum Tax?

The Alternative Minimum Tax (AMT) is a parallel tax calculation system enacted in 1969 to ensure that high-income individuals, corporations, estates, and trusts pay at least a minimum amount of federal income tax, regardless of deductions, credits, or exclusions they claim under the regular tax system.

Historical Context

Originally created when Congress discovered that 155 wealthy taxpayers legally paid zero federal income tax in 1969, the AMT was designed to close loopholes that allowed excessive use of tax preferences. While initially targeting the ultra-wealthy, the AMT began affecting middle-income taxpayers because it wasn’t indexed for inflation until 2013.

Current Impact

Following the Tax Cuts and Jobs Act (TCJA) of 2017 and the One Big Beautiful Bill Act (OBBBA) of 2025, the AMT now primarily affects:

Taxpayers with annual incomes exceeding $500,000
Those exercising Incentive Stock Options (ISOs)
Residents of high-tax states with substantial state and local tax deductions
Individuals with certain tax-exempt income from private activity bonds

Key Principle: You calculate your taxes twice—once under regular tax rules and once under AMT rules—and pay whichever amount is higher.

How AMT Is Calculated

The Core Formula

The AMT calculation follows this sequence, as detailed on IRS Form 6251:

Start with: Adjusted Gross Income (AGI) from Form 1040, Line 11
Add back: Tax preference items and AMT adjustments
Equals: Alternative Minimum Taxable Income (AMTI)
Subtract: AMT exemption amount (based on filing status and income)
Equals: AMT tax base
Multiply by: AMT tax rate (26% or 28%)
Equals: Tentative Minimum Tax (TMT)
Compare: If TMT > Regular Tax, you owe AMT

Visual Representation

Regular Taxable Income

+ Standard Deduction (added back)

+ State and Local Taxes (added back)

+ ISO Bargain Element

+ Private Activity Bond Interest

+ Other Adjustments

= Alternative Minimum Taxable Income (AMTI)

– AMT Exemption

= AMT Tax Base

× AMT Tax Rate (26% or 28%)

= Tentative Minimum Tax

If TMT > Regular Tax → Pay TMT

If TMT ≤ Regular Tax → Pay Regular Tax (no AMT)

2025 Tax Year Data (Filing in 2026)

Source: IRS Revenue Procedure 2024-40

AMT Exemption Amounts for 2025

Filing Status	Exemption Amount	Phase-Out Begins At	Phase-Out Rate
Single / Head of Household	$88,100	$626,350	25%
Married Filing Jointly	$137,000	$1,252,700	25%
Married Filing Separately	$68,500	$626,350	25%
Estates and Trusts	$30,550	$102,700	25%

Phase-Out Mechanics: For every dollar of AMTI above the threshold, your exemption decreases by $0.25. This continues until the exemption reaches zero.

Example: A single filer with $700,000 AMTI exceeds the threshold by $73,650 ($700,000 – $626,350). The exemption reduces by $18,412.50 (25% × $73,650), leaving an exemption of $69,687.50 ($88,100 – $18,412.50).

AMT Tax Rates for 2025

AMTI Range (After Exemption)	Tax Rate	Applies To
$0 to $239,100	26%	All filers except MFS
Above $239,100	28%	All filers except MFS
$0 to $119,550	26%	Married Filing Separately
Above $119,550	28%	Married Filing Separately

Source: Tax Foundation, IRS Revenue Procedure 2024-40

Standard Deduction for 2025

These amounts are added back for AMT purposes:

Filing Status	Standard Deduction
Single / Married Filing Separately	$15,750
Married Filing Jointly	$31,500
Head of Household	$23,625

Source: IRS Revenue Procedure 2024-40, as adjusted by OBBBA

2026 Tax Year Changes Under OBBBA

Source: IRS Revenue Procedure 2025-32, Tax Foundation

On July 4, 2025, the One Big Beautiful Bill Act (OBBBA) permanently extended the TCJA’s AMT provisions with significant modifications that take effect for the 2026 tax year.

AMT Exemption Amounts for 2026

Filing Status	Exemption Amount	Phase-Out Begins At	Phase-Out Rate	Change from 2025
Single / Head of Household	$90,100	$500,000	50%	Threshold lowered by $126,350
Married Filing Jointly	$140,200	$1,000,000	50%	Threshold lowered by $252,700
Married Filing Separately	$70,100	$500,000	50%	Threshold lowered by $126,350
Estates and Trusts	$31,400	N/A	50%	Minimal change

Source: IRS Revenue Procedure 2025-32

Critical Changes for 2026

1. Lower Phase-Out Thresholds

The phase-out now begins at income levels comparable to 2018:

Single filers: Drops from $626,350 (2025) to $500,000 (2026)
Joint filers: Drops from $1,252,700 (2025) to $1,000,000 (2026)

2. Accelerated Phase-Out Rate

The exemption phases out twice as fast in 2026:

2025: 25 cents per dollar
2026: 50 cents per dollar

3. Impact Analysis

Taxpayers with AMTI between $500,000 and $1,000,000 are significantly more likely to owe AMT in 2026 compared to 2025, even though the base exemption increased slightly.

2026 AMT Tax Rates

AMTI Range (After Exemption)	Tax Rate	Applies To
$0 to $244,500	26%	All filers except MFS
Above $244,500	28%	All filers except MFS
$0 to $122,250	26%	Married Filing Separately
Above $122,250	28%	Married Filing Separately

Source: IRS Revenue Procedure 2025-32

Comparative Example: 2025 vs. 2026

Married couple with $1,100,000 AMTI:

2025 Calculation:

Exemption: $137,000 (full amount, as income is below $1,252,700 threshold)
AMT Base: $963,000
Tax: Approximately $250,240

2026 Calculation:

Income exceeds threshold by: $100,000 ($1,100,000 – $1,000,000)
Exemption reduction: $50,000 (50% × $100,000)
Exemption: $90,200 ($140,200 – $50,000)
AMT Base: $1,009,800
Tax: Approximately $262,480

Result: The couple pays approximately $12,240 more in AMT in 2026 despite the slightly higher base exemption.

Source: Porte Brown LLC analysis, September 2025

Common AMT Triggers

Primary Triggers

1. Incentive Stock Options (ISOs)

The “bargain element”—the difference between the exercise price and fair market value at exercise—is taxable for AMT purposes even if you haven’t sold the stock.

Example: You exercise ISOs with a strike price of $10 per share when the fair market value is $50 per share for 10,000 shares.

Bargain element: ($50 – $10) × 10,000 = $400,000
This $400,000 is added to your AMTI, potentially triggering substantial AMT liability.

Source: Carta.com, Bankrate

2. State and Local Taxes (SALT)

While SALT deductions are capped at $10,000 for regular tax (increased to $40,000 for 2025-2029 under OBBBA), they are completely disallowed for AMT purposes.

2025-2029 SALT Changes Under OBBBA:

Deduction increases to $40,000 ($20,000 for MFS) for tax years 2025-2029
Phases down by 30% for MAGI between $500,000-$600,000
Reverts to $10,000 in 2030 unless extended
Still disallowed for AMT

Source: Charles Schwab, Baker Tilly, H&R Block

3. Standard Deduction

Under AMT rules, you cannot claim the standard deduction. The entire amount is added back to taxable income when calculating AMTI.

4. Private Activity Bond Interest

Interest from certain private activity municipal bonds is tax-free for regular tax but fully taxable for AMT purposes.

Secondary Triggers

Accelerated depreciation on certain property
Depletion deductions in excess of basis
Passive activity losses from certain investments
Long-term contracts not using percentage-of-completion method
Net operating loss deductions (limited for AMT)

Source: IRS Form 6251 Instructions, TurboTax

Calculation Examples

Example 1: Single Filer with ISOs (2025 Tax Year)

Scenario:

Filing Status: Single
AGI: $200,000
ISO Bargain Element: $50,000
Standard Deduction: $15,750
Regular Tax Owed: $45,000

Step 1: Calculate AMTI

AGI $200,000

+ ISO Bargain Element +$50,000

+ Standard Deduction +$15,750

= AMTI $265,750

Step 2: Apply Exemption

AMTI ($265,750) < Phase-out threshold ($626,350)
Full exemption applies: $88,100

AMTI $265,750

– Exemption -$88,100

= AMT Tax Base $177,650

Step 3: Calculate Tentative Minimum Tax

Base ($177,650) < $239,100, so use 26% rate

$177,650 × 0.26 = $46,189 (TMT)

Step 4: Compare and Determine AMT

Tentative Minimum Tax $46,189

Regular Tax $45,000

AMT Owed $1,189

Total Tax Liability: $46,189

Example 2: Married Couple with High SALT (2025 Tax Year)

Scenario:

Filing Status: Married Filing Jointly
AGI: $400,000
State and Local Taxes Paid: $60,000
SALT Deduction (Regular Tax): $40,000 (under OBBBA increase)
SALT Deduction (AMT): $0
Itemized Deductions: $70,000
Regular Tax Owed: $75,000

Step 1: Calculate AMTI

Taxable Income (AGI – Itemized) $330,000

+ SALT Add-Back +$60,000

= AMTI $390,000

Step 2: Apply Exemption

AMTI ($390,000) < Phase-out threshold ($1,252,700)
Full exemption applies: $137,000

AMTI $390,000

– Exemption -$137,000

= AMT Tax Base $253,000

Step 3: Calculate Tentative Minimum Tax

First $239,100 at 26%: $62,166
Remaining $13,900 at 28%: $3,892

$62,166 + $3,892 = $66,058 (TMT)

Step 4: Compare and Determine AMT

Tentative Minimum Tax $66,058

Regular Tax $75,000

AMT Owed $0

Result: No AMT owed; regular tax is higher.

Example 3: High-Income Couple with Phase-Out (2026 Tax Year)

Scenario:

Filing Status: Married Filing Jointly
AMTI: $1,200,000
Regular Tax: $300,000

Step 1: Calculate Reduced Exemption

AMTI $1,200,000

– Phase-out threshold -$1,000,000

= Excess $200,000

Exemption reduction = $200,000 × 50% = $100,000

Base exemption $140,200

– Reduction -$100,000

= Adjusted exemption $40,200

Step 2: Calculate AMT Tax Base

AMTI $1,200,000

– Adjusted exemption -$40,200

= AMT Tax Base $1,159,800

Step 3: Calculate Tentative Minimum Tax

First $244,500 at 26% $63,570

Remaining $915,300 at 28% $256,284

= TMT $319,854

Step 4: Compare and Determine AMT

Tentative Minimum Tax $319,854

Regular Tax $300,000

AMT Owed $19,854

Total Tax Liability: $319,854

This demonstrates how the 2026 phase-out changes significantly increase AMT exposure for high-income taxpayers.

Avoidance Strategies

1. Manage ISO Exercises

Timing Strategies:

Exercise ISOs early in the year to monitor AMT impact throughout the year
Spread exercises across multiple tax years to stay below exemption thresholds
Consider disqualifying dispositions in years when AMT is triggered
For 2025: Exercise more ISOs before 2026’s stricter phase-out rules take effect

Source: Kitces.com, Bankrate

2. Optimize Income Timing

Deferral Techniques:

Maximize pre-tax retirement contributions (401(k), 403(b), 457 plans)
Contribute to Health Savings Accounts (HSAs)
Use Flexible Spending Accounts (FSAs) where applicable
Defer bonuses or other variable compensation when approaching AMT territory

3. Strategic Tax Planning Around SALT

2025-2029 Considerations:

Take advantage of the $40,000 SALT deduction if not subject to AMT
Avoid prepaying state taxes if you’re in AMT zone (it provides no benefit)
Consider Pass-Through Entity Tax (PTET) elections in eligible states
Be aware that SALT is still fully disallowed for AMT despite the increased regular tax deduction

Source: Baker Tilly, Charles Schwab

4. Tax Loss Harvesting

Realize capital losses to offset capital gains
Reduces overall AGI and AMTI
Can carry forward unused losses to future years

5. Review Investment Holdings

Identify and consider selling private activity bonds if AMT-prone
Replace with investments that don’t trigger AMT preference items
Evaluate cost-benefit of tax-exempt vs. taxable investments

6. Consider AMT Credit (Form 8801)

If you paid AMT in prior years due to “deferral items” (like ISOs), you may be eligible for a Minimum Tax Credit in future years when:

You’re no longer subject to AMT, AND
Your regular tax exceeds your tentative minimum tax

Source: IRS Instructions for Form 8801

Frequently Asked Questions

Who is most likely to pay AMT?

High-income taxpayers with these characteristics:

Annual income between $500,000 and $2,000,000
Exercising substantial ISOs
Living in high-tax states (CA, NY, NJ, CT, IL)
Significant private activity bond interest

Source: Tax Foundation, Bankrate

How do I know if I’m subject to AMT?

You must complete IRS Form 6251 or use tax preparation software that automatically calculates both systems. Most modern tax software (TurboTax, H&R Block, TaxAct) includes this calculation automatically.

What is Form 6251?

Form 6251 (Alternative Minimum Tax – Individuals) is the IRS form used to calculate your AMT liability. It walks through all adjustments and preferences to determine if you owe AMT.

Filing Requirements:

Attach to Form 1040 or 1040-SR
Due by April 15, 2026 for 2025 taxes (or October 15, 2026 with extension)
File electronically along with your main return

Source: IRS Form 6251, SmartAsset

Can I avoid AMT completely?

While complete avoidance is difficult for high-income earners with certain income types, you can minimize exposure through:

Strategic income and deduction timing
Careful ISO exercise planning
Maximing retirement contributions
Multi-year tax planning

What happens if I paid AMT in previous years?

You may be eligible for a Minimum Tax Credit using Form 8801. This credit can offset future regular tax liability in years when you’re not subject to AMT. The credit generally applies only to “deferral” preference items (like ISOs), not “exclusion” items (like SALT or standard deduction).

Source: IRS Form 8801 Instructions

Do capital gains count toward AMT?

Yes, capital gains are included in AMTI, but they’re generally taxed at the same preferential rates (0%, 15%, or 20%) under both the regular tax system and AMT. However, the AMT can indirectly affect capital gains taxation by reducing your available exemption amount.

What is the “$600 rule” and does it affect AMT?

The “$600 rule” refers to third-party payment network reporting requirements (Form 1099-K). While unrelated to AMT triggers, any income reported via 1099-K increases your AGI, which is the starting point for AMTI calculations.

Current Status: The OBBBA modified the strict $600 threshold, implementing a phased approach with higher thresholds for casual sellers.

Source: IRS, H&R Block

Additional Resources

Official IRS Resources

IRS Form 6251: Download PDF
Form 6251 Instructions: Download PDF
IRS Revenue Procedure 2024-40: 2025 inflation adjustments
IRS Revenue Procedure 2025-32: 2026 inflation adjustments
Form 8801: Credit for Prior Year Minimum Tax

Legislative References

Tax Cuts and Jobs Act (TCJA) – P.L. 115-97 (December 2017)
One Big Beautiful Bill Act (OBBBA) – P.L. 119-21 (July 4, 2025)

Important Disclaimers

Tax Law Complexity: The information provided in this guide is for educational purposes only and should not be considered professional tax advice. Tax laws are complex and frequently change. Individual circumstances vary significantly.

Seek Professional Advice: Always consult with a qualified tax professional, CPA, or tax attorney for advice specific to your situation, especially if:

You have substantial ISO exercises
Your income exceeds $500,000
You’re considering complex tax strategies
You have international income or investments

Accuracy and Updates: While every effort has been made to ensure accuracy, tax laws and IRS guidance continue to evolve. The IRS typically releases final forms and instructions in late fall for the upcoming tax year.

Not Legal or Financial Advice: This guide does not constitute legal, financial, investment, or accounting advice. Readers should not act upon this information without seeking professional counsel.

Glossary of Key Terms

Adjusted Gross Income (AGI): Total income minus specific deductions, calculated on Form 1040.

Alternative Minimum Taxable Income (AMTI): Your income as calculated under AMT rules, including add-backs of preference items.

Bargain Element: For ISOs, the difference between the exercise price and fair market value at exercise.

Incentive Stock Options (ISOs): Employee stock options with special tax treatment that can trigger AMT.

Phase-Out: The gradual reduction of the AMT exemption as income increases beyond specified thresholds.

Preference Items: Income and deductions that receive favorable treatment under regular tax but are adjusted for AMT.

Private Activity Bonds: Municipal bonds whose interest is tax-free for regular tax but taxable for AMT.

SALT (State and Local Taxes): State and local income, property, and sales taxes.

Tentative Minimum Tax (TMT): Your tax liability calculated under AMT rules before comparison with regular tax.

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