Updated September 4, 2026. Quick answer. The Alternative Minimum Tax exemption for 2026 is $90,100 for single filers and $140,200 for married filing jointly, beginning to phase out once AMT income passes $500,000 (single) or $1,000,000 (joint), at a 50% reduction rate. Those phase-out thresholds are new this year: the One Big Beautiful Bill Act made the higher, TCJA-era exemption structure permanent and reset the phase-out starting points lower while doubling the reduction rate from the old 25%. The 2027 figures are not officially announced, and no named forecaster has published a projection.
What’s actually settled, vs. still open
Settled for 2026 (Revenue Procedure 2025-32): exemption $90,100 single / $140,200 joint; phase-out begins $500,000 single / $1,000,000 joint. The 28% AMT rate applies above $244,500 of AMTI for all taxpayers ($122,250 married filing separately).
Open: the 2027 exemption and phase-out thresholds, governed by 26 U.S.C. §55(d). The statute carries two regimes: §55(d)(1) is the older, lower default (base $78,750 joint / $50,600 single, 25% phase-out rate, indexed from a 2011 base); §55(d)(4) is the elevated post-TCJA regime (base $109,400 joint / $70,300 single, 50% phase-out rate, $1,000,000 phase-out start). OBBBA made §55(d)(4)’s elevated regime permanent, removing its scheduled expiration after 2025.
The numbers, year by year
| Year | Exemption, single | Exemption, joint | Phase-out start, single | Phase-out start, joint |
|---|---|---|---|---|
| 2022 | $75,900 | $118,100 | $539,900 | $1,079,800 |
| 2023 | $81,300 | $126,500 | $578,150 | $1,156,300 |
| 2024 | $85,700 | $133,300 | $609,350 | $1,218,700 |
| 2025 | $88,100 | $137,000 | $626,350 | $1,252,700 |
| 2026 | $90,100 | $140,200 | $500,000* | $1,000,000* |
*The 2026 phase-out thresholds are lower than 2025’s despite the exemption itself rising: OBBBA reset the phase-out starting points as part of the same structural change that raised the reduction rate to 50%. Don’t extrapolate the phase-out column visually against the prior years; it is not a simple continuation of the earlier trend.
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Why the phase-out column jumped
Before OBBBA, the exemption phased out at a 25% rate starting around $626,350 (single) / $1,252,700 (joint) for 2025, thresholds that had drifted upward for years under ordinary indexing. OBBBA's permanent elevated regime instead pins the phase-out start at flat $500,000 / $1,000,000 marks and doubles the rate at which the exemption erodes above them, which is a policy reset, not an inflation adjustment. Anyone comparing this page's 2026 phase-out figures against an older 2025 table should expect them to look like a decrease, not an increase, even though the exemption amount itself went up.
Sources
2026 figures: IRS, “IRS releases tax inflation adjustments for tax year 2026, including amendments from the One, Big, Beautiful Bill,” read at irs.gov on 2026-09-04, quoting Revenue Procedure 2025-32. Statute: 26 U.S.C. §55(d), read at law.cornell.edu on 2026-09-04; OBBBA's permanence and phase-out changes cross-confirmed via legal summaries (Kahn Litwin/KLR, Basswood Counsel). No 2027 figure or forecaster projection was found as of this date.
This page is updated the day the official figure is announced, and any projection above will be struck through rather than deleted, so the record of what was projected vs. what actually happened stays visible. See the 2027 numbers hub for every figure this program tracks, projected vs. official. General information, not tax or legal advice.