Alternative Minimum Tax (AMT) Planning for High Earners: 2026 Guide

The One Big Beautiful Bill Act (OBBBA) changed AMT in ways that hit the $2M–$20M bracket directly: the exemption phaseout rate doubled from 25% to 50%, and the phaseout threshold was reset lower. More high-income taxpayers owe AMT in 2026 than in recent years — and the most common triggers (ISO exercises, SALT, real estate depreciation) are exactly what this audience faces.

What AMT is and why it hits this bracket

The alternative minimum tax is a parallel tax system that runs alongside regular income tax. You compute your taxes twice — once under regular rules, once under AMT rules — and pay whichever is higher. The "extra" you pay above your regular tax is the AMT.

AMT was designed to ensure that high earners with significant deductions still pay a floor of tax. It does this by:

• Stripping out certain deductions (state/local taxes, miscellaneous itemized deductions)
• Adding back certain "preference items" (ISO bargain elements, accelerated depreciation differences, private activity bond interest)
• Applying a lower exemption that phases out faster at higher incomes
• Using a flat 26%/28% rate structure rather than the progressive regular brackets

The $2M–$20M bracket is particularly exposed because the most common AMT triggers — large ISO exercises, significant SALT deductions, and real estate depreciation — are precisely what accumulating professionals and business owners in this range encounter.

2026 AMT numbers: what OBBBA changed

The OBBBA (July 2025) made permanent the TCJA's higher exemption amounts but simultaneously reset the phaseout thresholds lower and doubled the phaseout rate. The net result: exemptions are generous if your income is moderate, but erode twice as fast once you cross the thresholds.¹

The four most common AMT triggers for this audience

1. Incentive stock option (ISO) exercises

When you exercise an ISO, the difference between the exercise price and the fair market value (the "bargain element") is not counted as regular income — but it is added to AMTI in full. A $500,000 bargain element on an ISO exercise adds $500,000 to AMTI, potentially creating a six-figure AMT bill even for a taxpayer with no other AMT issues.

This is the single most common AMT trigger at this wealth level. Executives and tech employees with large ISO grants face this decision every time they plan an exercise: which options, which year, how many shares, and at what stock price do they exercise to maximize the spread while controlling the AMT cost?

Note: when you later sell the ISO shares, the AMT credit (Form 8801) offsets future regular tax — the AMT on ISO exercises is often a timing cost, not a permanent one. But you still need the cash to pay it in the year of exercise.

See also: Equity Compensation: RSUs, ISOs, and NQSOs →

2. State and local tax (SALT) add-back

Under regular income tax, you can deduct state and local taxes on Schedule A (subject to limits). Under AMT, no SALT deduction is allowed at all — the full amount is added back to AMTI. For a California or New York resident paying $50,000–$100,000+ in state income tax, this add-back alone can create a meaningful AMT gap.

High-income taxpayers in low-deduction years (where AMT might not otherwise apply) often find that SALT is the difference-maker that pushes their AMTI above their regular taxable income.

3. Real estate depreciation

Under regular tax rules (MACRS), real estate depreciation is accelerated. Under AMT, the allowed depreciation is computed differently, and the excess is added back to AMTI as an AMT preference item. If you own significant investment real estate with large depreciation deductions, this can create an AMT exposure even without ISO exercises or large SALT payments.

Note: the OBBBA permanently restored 100% bonus depreciation for property placed in service after January 19, 2025. For personal property (equipment, etc.) this actually reduces the AMT preference issue since regular and AMT treatment converge when bonus depreciation fully expensed. Real property (buildings) still has the timing difference.²

4. Private activity bond interest

Tax-exempt interest from most municipal bonds is exempt from regular income tax. But interest from "private activity bonds" (bonds issued to fund private projects) is added to AMTI. For high-net-worth investors with large muni portfolios, this is worth checking — though most investors inadvertently hold some private activity bonds through muni bond funds.

AMT estimator calculator

Enter your 2026 figures to estimate whether you'll owe AMT and how much. This calculator uses a simplified regular-tax estimate alongside the AMTI calculation. For precise planning, work with your tax advisor — but this gives you a directionally accurate picture.

Six strategies to reduce AMT exposure

1. Time ISO exercises across multiple years

The most powerful AMT lever for executives with ISOs. If you have $1M in ISO bargain element available, exercising all in one year may create $200,000+ in AMT. Spreading exercises across 2–3 years — keeping the bargain element in each year just below the level that creates AMT — can eliminate most of the cost.

The calculation: what is the maximum bargain element you can exercise in a given year before your tentative minimum tax exceeds your regular tax? Run this calculation each year before your ISO grant expiration dates create forced decisions. See also: ISO planning guide →

2. Avoid AMT trigger years for large capital-gain harvesting

If you're already in an AMT year (due to ISO exercise or high SALT), adding more taxable income (capital gain harvesting, Roth conversions) compounds the problem. In non-AMT years, your effective marginal rate is lower — better timing for these events.

The insight: AMT creates an uneven rate landscape. Planning large income events in non-AMT years (even at technically higher regular-tax brackets) can produce lower total tax than clustering events in AMT years.

3. Defer SALT-heavy years to non-AMT years

For business owners and executives who have flexibility in how income is received (S-corp distributions, partnership K-1 income, bonus timing), shifting income to years with lower AMTI keeps SALT from becoming an AMT trigger. This requires multi-year planning rather than year-end scrambling.

4. Roth conversions: AMT credit absorption

If you paid significant AMT in a prior year due to ISO exercises, you have an AMT credit (Form 8801) that can be used to offset regular tax in future years. Roth conversions in low-income years accelerate the absorption of that credit — the higher regular tax from the Roth conversion "uses up" the credit faster.

This is a nuanced strategy. See: Roth Conversion Guide →

5. Real estate: monitor depreciation preference items

If you own investment real estate with large depreciation deductions, run an AMT calculation each year that includes the depreciation preference item. In years where the depreciation add-back creates AMT, consider whether the regular-tax benefit of the deduction still exceeds the AMT cost. For most real estate investors, it still does — but the calculation matters at the margin.

Note: real estate held in opportunity zone funds may have different depreciation rules; see QOZ planning →

6. Review muni bond allocation

If you hold municipal bonds in a taxable account, confirm what percentage are "private activity bonds" (PABs). PAB interest is taxable under AMT but not regular tax. Most national muni bond funds hold 5–15% PABs. In AMT years, this creates phantom income. Switching to "AMT-free" muni funds (which hold only governmental bonds) in AMT-heavy years can trim AMT exposure at the margin.

The AMT credit: your future tax refund

Any AMT paid above regular tax generates an AMT credit (Form 8801) that carries forward indefinitely. In future years when your regular tax exceeds your tentative minimum tax, the credit offsets that excess — effectively giving you back the AMT you paid.

This is particularly relevant for ISO-driven AMT: the "cost" of AMT in the exercise year is often recovered over 3–7 years as the credit is absorbed. The real risk is liquidity — you need cash to pay AMT in year one. If you exercise ISOs at a privately-held company (no liquidity), you may owe AMT on a bargain element for shares you can't sell.

What makes this hard to do without a specialist

AMT planning is inherently multi-year. The optimal ISO exercise strategy in year 1 depends on projected AMTI in years 2 and 3. The Roth conversion window interacts with AMT credit absorption. SALT-heavy years interact with bonus timing. Real estate depreciation varies by asset class and holding period.

A fee-only financial advisor who specializes in this income bracket models these interactions together — not one provision at a time. They run the ISO exercise optimization as part of a multi-year tax projection that includes Roth conversions, RMD planning, IRMAA bands, and estate strategy.

See also: Equity Compensation (RSUs, ISOs, NQSOs) → | Roth Conversion Strategy → | IRMAA Planning → | Tax-Loss Harvesting →

Sources

1. IRS — 2026 Cost-of-Living Adjustments (Rev. Proc. 2025-61). 2026 AMT exemption: $90,100 (single/HOH), $140,200 (MFJ). AMT 28% rate threshold: $244,500 (all filers except MFS). OBBBA permanently extended TCJA exemption levels with annual inflation adjustment. Phaseout thresholds reset to $500,000 (single) / $1,000,000 (MFJ) per OBBBA § [AMT]. Phaseout rate: 50% (OBBBA doubled from 25%). Values verified May 2026.
2. KLR — AMT Changes Under the One Big Beautiful Bill Act. Analysis of OBBBA AMT phaseout rate change from 25% to 50%, threshold reversion to $1M MFJ / $500K single, and implications for 2026 taxpayers. Notes that more high-income filers will owe AMT starting 2026 due to faster exemption phaseout.
3. Charles Schwab — One Big Beautiful Bill Act Tax Cuts Summary. Overview of OBBBA permanent provisions including 100% bonus depreciation (post-Jan 19 2025 property), AMT exemption permanence, and estate/gift exemption at $15M. Notes interplay between bonus depreciation and AMT depreciation preferences.
4. Crestwood Advisors — ISOs, AMT, and New OBBBA Rules. Detailed analysis of ISO bargain element as AMT preference item, multi-year ISO exercise planning framework, and AMT credit (Form 8801) recovery mechanics. Updated for 2026 phaseout changes.

AMT exemption amounts, phaseout thresholds, rates, and regular income tax brackets verified against IRS Rev. Proc. 2025-61 and OBBBA provisions, May 2026. This page is educational — AMT planning requires analysis of your specific tax situation by a qualified CPA or financial advisor.