Alternative Minimum Tax 2026 — What Business Owners and High-Income Taxpayers Need to Know
- Pathfinding Consultants
- May 11
- 10 min read
Updated: May 19
Pathfinding Consultants | Tax Preparation & Business Solutions | Orange County, CA | May 2026
Source: IRS Topic No. 556, Alternative Minimum Tax — irs.gov/taxtopics/tc556 | IRS Rev. Proc. 2025-32 | One Big Beautiful Bill Act (OBBBA), July 2025
IRS DISCLAIMER: This blog is for general informational purposes only and does not constitute tax advice. Tax laws are complex and subject to change. Every taxpayer situation is different. Please consult a qualified tax professional before making any tax-related decisions. For official IRS guidance on the Alternative Minimum Tax, visit irs.gov/taxtopics/tc556. |
Most small business owners and high-income taxpayers in Orange County have heard of the Alternative Minimum Tax but do not fully understand how it works or whether it applies to them. The AMT is a parallel tax system that runs alongside the regular federal income tax. It was originally designed to ensure that wealthy taxpayers could not use deductions and credits to eliminate their tax liability entirely. Today it catches many business owners, investors, and high-income professionals who do not expect it — especially in 2026, when the One Big Beautiful Bill Act (OBBBA) made changes that lower the income thresholds at which the AMT exemption begins to disappear. Business tax compliance now requires understanding whether your business income, investment activity, or deduction strategy could trigger the AMT. Pathfinding Consultants provides business tax preparation and tax compliance services across Orange County and this guide explains exactly how the AMT works in 2026, what triggers it, and what business owners should do about it. Source: IRS Topic No. 556 — irs.gov/taxtopics/tc556
What Is the Alternative Minimum Tax? — IRS Topic No. 556 Explained
According to IRS Topic No. 556, the Alternative Minimum Tax applies to taxpayers with high economic income by setting a limit on certain tax benefits. It helps to ensure that those taxpayers pay at least a minimum amount of tax. The AMT is the excess of the tentative minimum tax over the regular tax. You only owe AMT if your tentative minimum tax for the year is greater than your regular tax for that year.
How the AMT is calculated — in plain language Step 1: Calculate your regular taxable income. Step 2: Add back certain deductions and preferences that are allowed under the regular tax but not under the AMT. This gives you your Alternative Minimum Taxable Income (AMTI). Step 3: Subtract your AMT exemption from your AMTI. Step 4: Apply the AMT rate (26% or 28%) to the remaining AMTI. Step 5: If this tentative minimum tax is higher than your regular tax, you pay the difference as AMT. The key concept is that you always pay the higher of your regular tax or your tentative minimum tax — never both, but always the larger of the two. |
The AMT eliminates or limits many deductions that reduce your regular taxable income. The most significant items added back to calculate AMTI include the state and local tax (SALT) deduction, standard deduction (not allowed under AMT), certain depreciation differences, percentage depletion in excess of adjusted basis, and the bargain element when exercising incentive stock options. Business tax planning that relies heavily on any of these items should always include an AMT check.
2026 AMT Exemption Amounts and Phase-Out Thresholds — Official IRS Numbers
The following 2026 AMT exemption amounts are sourced directly from IRS Revenue Procedure 2025-32 and reflect changes made by the One Big Beautiful Bill Act signed in July 2025. These numbers apply to tax returns filed for the 2026 tax year.
Filing Status | 2026 Exemption | Phase-Out Begins | Phase-Out Rate |
Single / Head of Household | $90,100 | $500,000 | 50 cents per $1 |
Married Filing Jointly | $140,200 | $1,000,000 | 50 cents per $1 |
Married Filing Separately | $70,100 | $500,000 | 50 cents per $1 |
Source: IRS Rev. Proc. 2025-32 | IRS Topic No. 556 — irs.gov/taxtopics/tc556 Phase-out rate of 50 cents per dollar reflects the OBBBA change effective January 1, 2026. Under prior TCJA rules the phase-out rate was 25 cents per dollar. |
2026 AMT Tax Rates
Alternative Minimum Taxable Income (AMTI) After Exemption | AMT Tax Rate |
Up to $244,500 (MFJ and single) | 26% |
Over $244,500 (MFJ and single) | 28% |
Over $122,250 (married filing separately) | 28% |
Source: IRS Rev. Proc. 2025-32 | IRS Topic No. 556 — irs.gov/taxtopics/tc556 Phase-out rate of 50 cents per dollar reflects the OBBBA change effective January 1, 2026. Under prior TCJA rules the phase-out rate was 25 cents per dollar. |
What the exemption phase-out means in practice If you are a single filer and your AMTI is $600,000 in 2026 — your AMTI exceeds the $500,000 phase-out threshold by $100,000. At a 50-cent phase-out rate, your exemption is reduced by $50,000. Your remaining exemption is $90,100 minus $50,000 = $40,100. Your AMTI subject to AMT rates is $600,000 minus $40,100 = $559,900. At 26% on the first $244,500 and 28% on the remainder, your tentative minimum tax is approximately $173,000. If your regular tax is lower than $173,000, you owe the difference as AMT. This is business tax compliance at a level where a qualified tax professional is essential. |
Not sure if you owe the AMT in 2026?
Pathfinding Consultants reviews every business and high-income tax return for AMT exposure as part of our business tax preparation process. Book your consultation today.
The Big 2026 Change — How the One Big Beautiful Bill Act Affects the AMT
The One Big Beautiful Bill Act signed in July 2025 made permanent many of the favorable AMT provisions from the Tax Cuts and Jobs Act of 2017 — but it also introduced two changes that increase AMT exposure for higher-income taxpayers beginning January 1, 2026. Understanding these changes is a critical part of business tax compliance and business tax planning for 2026.
Change 1 — Phase-out thresholds reverted to lower 2018 levels Under the TCJA (2018-2025), the AMT exemption phase-out began at $626,350 for single filers and $1,252,700 for married couples. Beginning in 2026, the OBBBA reduced these thresholds back to $500,000 for single filers and $1,000,000 for married couples. This means the exemption begins to disappear at a lower income level than it did under the TCJA. Business owners and investors who were comfortably below the phase-out range under prior law may find themselves in the phase-out zone for the first time in 2026. |
Change 2 — Phase-out rate doubled from 25% to 50% Under the TCJA, every dollar of AMTI above the phase-out threshold reduced the exemption by 25 cents. Beginning in 2026, the OBBBA doubled this rate to 50 cents per dollar. The practical effect is that the exemption disappears twice as fast once the phase-out begins. For a single filer, the full $90,100 exemption is completely eliminated once AMTI reaches $680,200 ($500,000 threshold plus $90,100 exemption divided by 50%). Under prior law it took $862,800 of AMTI to eliminate the same exemption. Business tax saving strategies that previously kept taxpayers safely below the full elimination point may no longer work in 2026. |
What stayed the same under OBBBA The OBBBA permanently extended the TCJA provisions that eliminate certain AMT adjustments that existed before 2018 — including the personal exemption add-back, the miscellaneous itemized deduction add-back, and the home equity loan interest add-back. These items will not come back as AMT adjustments. The exemption amounts themselves ($90,100 single, $140,200 MFJ) are higher than pre-TCJA levels and continue to be indexed for inflation. The overall number of taxpayers subject to AMT is not expected to return to pre-TCJA levels — but more high-income taxpayers will be affected than in 2018-2025. |
What Triggers the AMT for Business Owners — The Key Add-Back Items
Business tax compliance requires identifying your specific AMT exposure before filing. The following are the most common items that increase AMTI and trigger AMT liability for business owners and self-employed taxpayers. If any of these apply to your business or personal tax situation, a qualified business tax consultant should review your AMT position before your return is filed.
1. State and Local Tax (SALT) Deduction Add-Back California has one of the highest state income tax rates in the country — up to 13.3%. Under the regular tax system, SALT is deductible up to the TCJA cap. Under the AMT, the SALT deduction is completely disallowed and must be added back to calculate AMTI. Orange County business owners and high-income individuals who itemize and claim significant California state income tax deductions are among the most common AMT targets because of this add-back. |
2. Accelerated Depreciation Differences Business tax saving through accelerated depreciation — including Section 179 expensing and bonus depreciation — can create differences between regular tax depreciation and AMT depreciation. For certain types of property, the AMT requires a slower depreciation method than what the regular tax allows. The difference between the two depreciation amounts is added back to AMTI. Businesses with significant equipment purchases that used bonus depreciation should check whether an AMT depreciation adjustment applies. |
3. Incentive Stock Option (ISO) Exercise This is one of the most powerful individual AMT triggers. When you exercise an incentive stock option, the bargain element — the difference between the fair market value of the stock and the price you paid — is not taxed for regular tax purposes in the year of exercise. But it is added back as AMT income in the year of exercise. For business owners and employees who hold significant ISO equity, exercising options in a high-income year can push AMTI well above the exemption and generate a substantial AMT liability. |
4. Pass-Through Income from S-Corporations and Partnerships The IRS specifically lists income or loss from pass-through entities — S-Corps, partnerships, and LLCs taxed as partnerships — as a potential AMT adjustment item. If the pass-through entity itself has AMT adjustments, those flow through to individual shareholders and partners on Schedule K-1. Business owners receiving Schedule K-1 income should verify whether any AMT adjustments are included in their K-1 package before finalizing their personal return. |
5. Percentage Depletion Certain natural resource businesses — oil, gas, and mineral extraction — can claim percentage depletion deductions that exceed their adjusted basis in the property under regular tax rules. The amount of percentage depletion that exceeds the adjusted basis of the property must be added back to AMTI. Business owners in oil and gas or mining industries should review their depletion calculations for AMT purposes. |
Form 6251 — How to Calculate Your AMT
The AMT is calculated on IRS Form 6251, Alternative Minimum Tax — Individuals. You are required to complete and attach Form 6251 to your Form 1040 if the IRS determines your tentative minimum tax may exceed your regular tax. The Instructions for Form 1040 include specific guidance on the AMT line and whether you need to complete Form 6251. Business tax preparation by a qualified consultant will include an automatic AMT review on Form 6251 for any return where AMT exposure is possible.
AMT credit carryforward — Form 8801 If you paid AMT in a prior tax year and you are not liable for AMT in the current year, you may be eligible for a special minimum tax credit against your regular tax. This credit is calculated on IRS Form 8801, Credit for Prior Year Minimum Tax. The AMT credit carries forward indefinitely until it can be used in a year when your regular tax exceeds your tentative minimum tax. Pathfinding Consultants reviews prior-year AMT credit carryforwards for every new client whose prior returns show AMT liability. |
What Business Owners Should Do About the AMT in 2026
The AMT is not something most small business owners can evaluate accurately on their own. The calculation requires comparing two parallel tax systems, identifying which items trigger add-backs, and determining whether the tentative minimum tax exceeds the regular tax. However, there are several proactive steps that business tax planning and business tax compliance services from Pathfinding Consultants can take to manage AMT exposure:
• Review AMTI before year-end — knowing whether you are in an AMT-risk zone before December 31 allows timing decisions that reduce exposure • Identify all K-1 AMT adjustments — review every Schedule K-1 received from S-Corps, partnerships, and LLCs for AMT-specific line items • Review ISO exercise timing — if you hold incentive stock options, exercising in a year when your regular income is lower reduces the AMT risk from the bargain element add-back • Check prior-year AMT credit — if you paid AMT in prior years, Form 8801 may generate a credit against your current year regular tax • Review depreciation methods — certain property categories depreciated using accelerated methods for regular tax may require an AMT adjustment that should be calculated before filing • Work with a business tax consultant for any return involving pass-through income, ISOs, significant depreciation, or SALT deductions above $10,000 |
Pathfinding Consultants provides business tax preparation and business tax compliance services for Orange County small and mid-size businesses. For every business tax return where AMT exposure is possible, we complete the Form 6251 analysis as a standard part of the engagement. Business tax saving starts with knowing exactly where you stand — including whether the AMT is part of your tax picture. If you are searching for a business tax consultant near me in Orange County who understands the 2026 AMT changes under the One Big Beautiful Bill Act, Pathfinding Consultants is ready to help.
Find out if the AMT affects your 2026 business tax return
Pathfinding Consultants reviews AMT exposure for every eligible business and individual return across Orange County. Schedule your business tax consultation now and get a clear answer before the filing deadline.
Key Takeaways — Alternative Minimum Tax 2026
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IRS DISCLAIMER: This blog is for general informational purposes only and does not constitute tax advice. Tax laws are complex and subject to change. Every taxpayer situation is different. Please consult a qualified tax professional before making any tax-related decisions. For official IRS guidance on the Alternative Minimum Tax, visit irs.gov/taxtopics/tc556. |
Ready to review your 2026 AMT exposure with a qualified business tax consultant?
Pathfinding Consultants serves Orange County small and mid-size businesses with transparent, reliable tax preparation services. Book your consultation at calendly.com/pathfindingconsultants/30min
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