AMT Exposure Calculator
Estimate 2026 Alternative Minimum Tax exposure with Form 6251-style AMTI adjustments, ISO bargain element, private activity bond interest, exemption phaseout, preferential capital gain treatment, and regular-tax comparison.
Last Updated: May 31, 2026
AMT Exposure Inputs
Compare regular tax with tentative minimum tax using 2026 Form 6251-style AMTI adjustments, exemption phaseout, ISO bargain element, private activity bond interest, and preferential capital gain treatment.
Controls the 2026 AMT exemption, phaseout range, and capital gain thresholds.
Usually Form 1040 taxable income before AMT adjustments.
Use the Form 6251 line 10 equivalent after applicable nonrefundable credits.
Schedule A tax add-back or standard deduction amount when not itemizing.
Enter positive or negative state-tax refund and tax benefit adjustments.
Tax-exempt private activity bond interest can be an AMT preference item.
Spread between fair market value and exercise price for unsold ISO shares.
Used for the simplified preferential-rate AMT path.
Optional Form 6251 AMT foreign tax credit estimate.
Alternative Minimum Tax
$36,590.00
Tentative Minimum Tax
$83,590.00
Alternative Minimum Taxable Income
$406,100.00
Allowed AMT Exemption
$90,100.00
Regular Tax Room
$0.00
AMT Status
AMT currently due
Form 6251 Exposure Readout
The modeled AMTI is $406,100.00. After the $90,100.00 allowed exemption, taxable AMTI is $316,000.00 and tentative minimum tax is $83,590.00. Current status: AMT currently due.
- 2026 exemption before phaseout
- $90,100
- Phaseout status
- Below exemption phaseout
- Exemption phaseout reduction
- $0.00
- Phaseout starts at
- $500,000
- Complete phaseout at
- $680,200
- Room before phaseout
- $93,900.00
- 28% AMT breakpoint
- $244,500
- Room before 28% AMT rate
- $0.00
- Marginal tentative AMT rate
- 28.00%
- ISO-sensitive AMT
- $36,590.00
- Effective TMT rate on AMTI
- 20.58%
- Regular tax needed to clear AMT
- $36,590.00
AMT Worksheet Trace
| Worksheet item | Amount |
|---|---|
| Regular taxable income | $210,000.00 |
| Total AMT adjustments and preferences | $196,100.00 |
| Alternative minimum taxable income | $406,100.00 |
| AMT exemption before phaseout | $90,100.00 |
| Exemption reduction | $0.00 |
| Allowed AMT exemption | $90,100.00 |
| Taxable AMTI after exemption | $316,000.00 |
| Tentative minimum tax before AMT FTC | $83,590.00 |
| AMT foreign tax credit | $0.00 |
| Tentative minimum tax | $83,590.00 |
| Regular tax for comparison | $47,000.00 |
| Alternative minimum tax | $36,590.00 |
Preferential Rate Check
- Preferential income used
- $0.00
- Ordinary AMT taxable income
- $316,000.00
- 0% preferential bucket
- $0.00
- 15% preferential bucket
- $0.00
- 20% preferential bucket
- $0.00
- Preferential-rate method used
- No
Review Notes
- The ISO bargain element is driving part of the modeled AMT. Review possible future minimum tax credit treatment on Form 8801.
AMT Adjustment Breakdown
Review which entries are regular income, AMT preferences, AMT adjustments, and AMT credits before relying on the comparison.
| Item | Category | Amount |
|---|---|---|
| Regular taxable income | regular income | $210,000.00 |
| Taxes or standard deduction add-back | preference | $16,100.00 |
| Tax refund or tax benefit adjustment | adjustment | $0.00 |
| Investment interest adjustment | adjustment | $0.00 |
| Medical deduction adjustment | adjustment | $0.00 |
| Private activity bond interest | preference | $0.00 |
| ISO bargain element | preference | $180,000.00 |
| Depreciation and passive adjustments | adjustment | $0.00 |
| Loss limit and NOL adjustments | adjustment | $0.00 |
| Other AMT adjustments | adjustment | $0.00 |
| AMT foreign tax credit | credit | $0.00 |
2026 AMT constants used: $90,100 single exemption, $140,200 joint exemption, 50% exemption phaseout rate, and $244,500 28% breakpoint for most filing statuses.
AMT Planning Estimate Disclaimer
This calculator is an educational estimate for individual taxpayers. It does not replace Form 6251, Form 8801, Schedule D worksheets, AMT foreign tax credit limits, tax software, or professional review for estates, trusts, carryovers, business adjustments, passive activity rules, or complex credit interactions.
Professional Review Status
This YMYL page has internal methodology review, but no external credentialed professional review is recorded yet.
- Reliance status
- Credentialed tax review required before professional reliance
- Required credentials
- CPA, Enrolled Agent, licensed tax professional
- Review scope
- tax formulas, jurisdiction assumptions, withholding language, filing-sensitive examples, and compliance caveats
Current reviewer: Iliyas Khan, Internal tax and sales-tax methodology reviewer.
This page is educational planning support. A named CPA, EA, or licensed tax professional should review the page before it is positioned as tax advice or used for filing decisions.
Tax credentialed review: professional reliance limit
This page is educational planning support. A named CPA, EA, or licensed tax professional should review the page before it is positioned as tax advice or used for filing decisions. Results should be treated as a preliminary estimate, not a filing instruction, diagnosis, product recommendation, eligibility decision, or compliance sign-off. Required professional review: CPA, Enrolled Agent, licensed tax professional. Source expectation: Review should cite current IRS, state revenue department, payroll-tax, or official tax authority sources where applicable.
Checked by Iliyas Khan
AMT Exposure Calculator is checked for formula labels, source links, and result limits.
Iliyas Khan, Chief Operating Officer. Updated May 31, 2026. Scope: tax calculators.
Tax credentialed review: Named internal reviewer: Iliyas Khan, Chief Operating Officer. External credentialed professional review is still required before this page is treated as professional advice.
Internal tax and sales-tax methodology reviewer. Review scope: calculator assumptions, labels, source context, workflow clarity, and compliance-sensitive disclaimers.
Relevant review context: CalculatorWallah tax and sales-tax calculator workflow owner; Source-first review of IRS, state revenue, rate, and filing-sensitive references; Compliance-sensitive labels, assumptions, and user-facing disclaimer review.
Required professional credentials: CPA, Enrolled Agent, licensed tax professional. Scope: tax formulas, jurisdiction assumptions, withholding language, filing-sensitive examples, and compliance caveats.
This page is educational planning support. A named CPA, EA, or licensed tax professional should review the page before it is positioned as tax advice or used for filing decisions.
How To Use The AMT Exposure Calculator
Start with regular taxable income and the regular-tax amount used for the AMT comparison. The regular-tax amount is important because AMT is only due when tentative minimum tax is higher than regular tax.
Add AMT adjustments and preference items one group at a time. ISO bargain element, private activity bond interest, taxes or standard deduction, depreciation differences, passive activity adjustments, investment interest, and loss or NOL items can all change alternative minimum taxable income.
If qualified dividends or long-term capital gains are included in taxable income, enter that amount separately. The calculator then compares the regular 26%/28% AMT calculation with a simplified preferential-rate AMT path.
Step 1: Enter filing status and regular taxable income
Filing status controls the 2026 AMT exemption, exemption phaseout band, 28% breakpoint, and capital gain thresholds.
Step 2: Enter regular tax for the AMT comparison
Use the regular-tax amount that Form 6251 compares with tentative minimum tax after applicable nonrefundable credits.
Step 3: Add AMT adjustments and preference items
Model taxes or standard deduction, ISO bargain element, private activity bond interest, depreciation or passive adjustments, investment interest, and other Form 6251 items.
Step 4: Separate preferential capital gain income
Qualified dividends and long-term gains can receive preferential AMT rates, so entering them separately improves the exposure estimate.
Step 5: Review tentative minimum tax versus regular tax
AMT is modeled only when tentative minimum tax exceeds regular tax. The calculator also shows phaseout status, ISO-sensitive AMT, and near-crossover warnings.
How The 2026 AMT Formula Works
The Alternative Minimum Tax is a parallel tax system. You start with regular taxable income, add AMT adjustments and preferences, subtract the allowed AMT exemption, apply AMT rates, then compare tentative minimum tax with regular tax.
For 2026, the IRS published AMT exemptions and phaseout bands in Internal Revenue Bulletin 2025-45. The exemption phases out at 50% of AMTI above the phaseout start, which means the effective marginal tentative minimum tax rate can be higher inside the phaseout zone.
| Filing status | 2026 exemption | Phaseout starts | Complete phaseout | 28% breakpoint |
|---|---|---|---|---|
| Single | $90,100 | $500,000 | $680,200 | $244,500 |
| Married filing jointly | $140,200 | $1,000,000 | $1,280,400 | $244,500 |
| Married filing separately | $70,100 | $500,000 | $640,200 | $122,250 |
| Head of household | $90,100 | $500,000 | $680,200 | $244,500 |
| Qualifying surviving spouse | $140,200 | $1,000,000 | $1,280,400 | $244,500 |
AMT Exposure Guide: Form 6251, AMTI Adjustments, ISO Exercise Planning, Exemption Phaseout, Capital Gains, And Regular-Tax Crossover
What counts as an AMT adjustment or preference?
AMT exposure usually comes from items that regular tax either deducts, excludes, or times differently. The calculator keeps these drivers visible so a taxpayer can see whether the risk is an ISO exercise, a deduction add-back, private activity bond interest, capital gains, or a business timing adjustment.
| AMT driver | Calculator field | Why it matters |
|---|---|---|
| Taxes or standard deduction | Schedule A tax add-back or standard deduction | State/local taxes and the standard deduction do not reduce AMTI the same way they reduce regular taxable income. |
| Incentive stock options | ISO bargain element | Unsold ISO shares can create AMT income even without a regular-tax sale. |
| Private activity bonds | Tax-exempt private activity bond interest | Some tax-exempt interest is still an AMT preference item. |
| Depreciation and passive items | Business or property AMT adjustment | Depreciation methods and passive loss treatment can differ under AMT. |
| Preferential income | Qualified dividends and long-term gains | Capital gains may still get preferential AMT rates but can raise AMTI and phase out the exemption. |
Why ISO exercises are a common AMT problem
Incentive stock options can create AMT income when the fair market value at exercise is higher than the exercise price and the shares are not sold in the same year. The calculator labels ISO-sensitive AMT by comparing the scenario with and without the ISO bargain element. That amount is a review flag for possible future minimum tax credit analysis, not a final Form 8801 credit.
Preferential gains still matter
Long-term capital gains and qualified dividends can still use preferential rates in the AMT calculation, but they can raise AMTI and reduce the exemption. That is why a large gain can indirectly increase AMT even when the gain itself is not taxed at the ordinary 26% or 28% AMT rates.
Common planning triggers
| Trigger | AMT effect | How to model it |
|---|---|---|
| ISO exercise before sale | The bargain element can increase AMTI. | Run before exercising, after exercising, and after a same-year sale scenario. |
| High-income phaseout year | AMT exemption can shrink by 50% of AMTI above the phaseout start. | Watch the marginal tentative minimum tax rate, not just the 26% and 28% headline rates. |
| Large long-term gain year | Preferential gain rates may lower AMT but the gain can still affect exemption phaseout. | Enter the gain in taxable income and in the preferential-income field. |
| Private activity bond income | Regular-tax exempt interest may become an AMT preference. | Enter it separately so the worksheet trace makes the driver visible. |
Official video source note
CalculatorWallah reviewed official and institutional video sources for a current, concise AMT or Form 6251 walkthrough. No suitable official or recognized institutional video was found, so this calculator page relies on IRS written sources, including Form 6251, the Form 6251 instructions, Topic 556, and the 2026 IRS inflation adjustment bulletin.
Connect AMT to other tax tools
Use this page when the main question is AMT exposure. If you still need to estimate regular federal tax first, start with the Federal Income Tax Calculator. If the scenario is a stock sale, use the Capital Gains Tax Calculator. For a deeper plain-English walkthrough, read the AMT Calculator Guide.
Keep the research moving with Federal Income Tax Calculator, Capital Gains Tax Calculator, NIIT 3.8% Tax Calculator, and Roth Conversion Tax Calculator.
Frequently Asked Questions
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Read guideSources & References
- 1.IRS Internal Revenue Bulletin 2025-45 - 2026 tax inflation adjustments(Accessed May 2026)
- 2.IRS - About Form 6251, Alternative Minimum Tax - Individuals(Accessed May 2026)
- 3.IRS Topic No. 556 - Alternative Minimum Tax(Accessed May 2026)
- 4.IRS Instructions for Form 6251(Accessed May 2026)
- 5.IRS Form 6251 - Alternative Minimum Tax - Individuals(Accessed May 2026)
- 6.IRS Interactive Tax Assistant(Accessed May 2026)