AMT Private Activity Bonds 2026 Calculator
AMT private activity bonds 2026: add PAB interest to regular taxable income, apply $88,100 single / $137,000 joint exemption with phase-out starting $626,350 / $1,252,700, tax at 26%/28% brackets, pay the higher of AMT or regular tax under IRC §55-59.
| Regular taxable income | — |
| + Preferences & add-backs | — |
| + Private activity bond interest | — |
| = Alternative Minimum Taxable Income (AMTI) | — |
| AMT exemption (after phase-out) | — |
| AMTI after exemption | — |
| Tentative minimum tax (26%/28%) | — |
| Less regular tax | — |
| AMT owed (additional) | — |
The Alternative Minimum Tax (AMT) under IRC §55-59 is a parallel tax computed by adding preference items — including private activity bond (PAB) interest — back to taxable income, applying a 2026 exemption of $88,100 single / $137,000 joint with phase-out starting at $626,350 / $1,252,700, then taxing the result at 26% (up to $239,100) and 28% (above). You pay the higher of regular tax or tentative AMT.
Why Private Activity Bonds Trigger AMT
Most municipal bond interest is tax-free for both regular and AMT purposes. However, private activity bonds issued after August 7, 1986 — bonds whose proceeds finance private business activity rather than purely governmental purposes — keep their regular tax exemption but become a preference item under IRC §57(a)(5). Investors in PABs face an unpleasant surprise: a "tax-free" bond can push them into AMT and create real tax. The American Recovery and Reinvestment Act exempted PABs issued 2009-2010 from AMT preference, but bonds outside that window remain preferences.
2026 AMT Exemption and Phase-Out (Rev. Proc. 2025-32)
The 2026 AMT exemption is $88,100 single / $137,000 joint / $68,500 MFS, reduced by 25 cents for every $1 of AMTI above $626,350 single / $1,252,700 joint. The exemption fully phases out at AMTI of ~$978,750 single / $1,800,700 joint. AMT brackets are 26% up to $239,100 AMTI excess (after exemption) and 28% above. Capital gains keep their preferential rates inside AMT.
Common AMT Triggers and Minimization Strategies
The biggest AMT triggers in 2026: ISO bargain element exercised but not sold in the same year; PAB interest; large state and local tax deductions (now capped at $10K under TCJA so less of a trigger than pre-2018); accelerated depreciation on real and personal property. Strategies: (1) time ISO exercises to use the AMT cliff carefully; (2) avoid PABs if you're regularly near AMT — buy regular municipals instead; (3) track prior-year AMT credit carryforward on Form 8801 to recover AMT paid on deferral items; (4) accelerate income into a known-AMT year if your regular rate exceeds 28%.
Last updated May 2026. Sources: IRC §55-59, IRS Form 6251, Rev. Proc. 2025-32.