TCJA Sunset Provisions and the 2025 Cliff

The TCJA's sunsets were a deliberate legislative artifact, not an oversight, and understanding that origin is what separates reactive from proactive advisory. Reconciliation rules required the bill to stay under a deficit ceiling measured across a ten-year window, and a law that cut taxes permanently across the board would have blown through that ceiling. So the drafters split the law into two tiers: provisions that could survive the ten-year math permanently, and provisions that could not, and had to be written with a shutoff switch. Twenty-three separate provisions ended up on the temporary side, all set to expire December 31, 2025, unless a future Congress acted to extend, replace, or make them permanent. Bloomberg Tax has called the result a "tax cliff," a term that captures both the scale of the change and the fact that it would hit all at once rather than phasing in gradually.

That structure matters for how practitioners think about the law, because it means the cliff was never a single event. It was a set of separate expiration dates bundled under one deadline, each governed by its own statutory language and its own reversion rule, and the corporate rate cut to 21% sat outside this entire mechanism: it was drafted as permanent from the start, so the cliff never touched it. Everything at risk belonged to the individual, pass-through, and estate side of the code.

What the cliff looked like before Congress acted

Before Congress intervened, the code was set to snap back to its pre-2017 rules across four major fronts at once: individual rates, deductions, the pass-through business deduction, and estate exemptions. None of these reversions operated in isolation, and a client's total exposure depended on which combination applied to their return.

On individual rates, the top bracket would have jumped from its TCJA level back to the higher pre-TCJA top rate, and the brackets beneath it would have compressed as well, pushing many filers into higher marginal rates at lower income thresholds. The standard deduction would have taken a similarly sharp hit: the 2024 married-filing-jointly amount would have been cut by nearly half, which would have pushed a meaningful number of filers back toward itemizing for the first time in years. The Child Tax Credit would have lost half its maximum per-child value. The Section 199A qualified business income deduction would have disappeared entirely, eliminating the 20% pass-through write-off and effectively raising business tax rates meaningfully for pass-through owners.

The state and local tax picture would have moved in the opposite direction. Citrin Cooperman has pointed out that the reversion would have gone further than headline rate changes: the miscellaneous itemized deduction floors would have come back, and the mortgage interest deductibility limit would have risen, both of which reshape how taxable income gets calculated for a broad swath of middle-income households, including the wealthiest filers.

This reversion would not have hit every household the same way. Families with several dependents stood to gain from the return of personal exemptions, and some middle-income filers, once every provision was netted out, would have landed at a net-neutral or even net-positive result. The group facing the clearest and largest hit sat in the mid-six-figure income bracket, where the bracket compression alone would have meant roughly a four-percentage-point rate increase. That unevenness is the reason provision-by-provision modeling, rather than a single blended estimate, was the only way to tell a given client what the cliff actually meant for their return.

How clients and advisors were already responding before the law changed

Long before the OBBBA passed, the estate tax provisions generated the most visible planning activity, and for good reason: the exemption amount and its expiration date were both fixed numbers, which made the cost of waiting easy to quantify. High-net-worth families and their advisors moved to use the $13.99 million exemption while it stood, since a completed gift made under the higher exemption, one with no retained interest, was generally protected from clawback even after a later reversion, a point the IRS had already clarified. That clarity turned a theoretical planning window into a concrete deadline, and it explains why so much estate work accelerated in the years leading up to 2025.

Spousal Lifetime Access Trusts became one of the primary vehicles for that acceleration. A SLAT is an irrevocable trust that lets one spouse gift assets out of the estate while the other spouse, as beneficiary, retains access to distributions, which made it attractive to couples who wanted to use the exemption but were not ready to cut off both spouses' access to the transferred wealth entirely. J.P. Morgan Wealth Management has described SLATs as particularly well suited to exactly that situation, and noted that when a SLAT is structured as a grantor trust, the donor can pay the trust's income taxes personally, which shrinks the taxable estate further without triggering any additional taxable gift. Some families went a step further and allocated the generation-skipping transfer tax exemption to a SLAT built as a Dynasty Trust, extending the benefit across multiple generations rather than just to the next one. Simpler outright gifting, using the 2025 annual exclusion amount, gave clients with clear transfer intent and no creditor concerns a way to move assets without touching the lifetime exemption at all.

The same anticipatory logic appeared outside the estate context. Businesses facing the bonus depreciation phase-down were timing equipment purchases around the shrinking depreciation percentage rather than around when the equipment was actually needed operationally. None of this activity waited for Congress to act, because the risk was already quantifiable and the deadline was already fixed. The lesson embedded in all of it is that provision-level mapping, treating each piece of exposure on its own terms rather than reacting to the cliff as a single undifferentiated event, was already the correct advisory posture before the law changed. The OBBBA's passage does not retire that discipline. It gives it a new set of provisions to apply to.

What the One Big Beautiful Bill Act actually resolved and how

H.R. 1, the One Big Beautiful Bill Act, was signed into law on July 4, 2025, and it resolved most of the acute cliff risk by making the bulk of the TCJA's temporary provisions permanent.

On individual rates, the seven-bracket structure carried over by the TCJA is now permanent and indexed for inflation, which takes the feared top-rate reversion off the table entirely. The standard deduction stays permanently extended at levels meaningfully higher than the pre-TCJA amount. The Child Tax Credit is preserved and increased per child for 2025, with inflation indexing beginning in 2026. The SALT cap was raised substantially for taxpayers below a modified adjusted gross income threshold in 2025, though this is a targeted increase rather than the full restoration of unlimited deductibility that a straight reversion would have produced. The estate and gift tax exemption was made permanent and, effective 2026, increased by statute to $15 million per individual, a figure higher than the pre-OBBBA TCJA level, with inflation adjustments starting in 2027. Bonus depreciation was restored permanently for qualified property acquired on or after January 20, 2025.

Alongside these permanent fixes, the law introduced new temporary provisions running from 2025 through 2028: a sizable above-the-line deduction for individuals age 65 and older, and a deduction for a substantial amount of tip and overtime wage income. Both carry a 2028 expiration date written into the statute in the same form that produced the original TCJA cliff.

Why "Permanent" Is a Softer Guarantee Than It Sounds

Calling a provision "permanent" in the tax code means only that it lacks a built-in expiration date. It does not mean the provision is insulated from repeal, and the OBBBA's own fiscal profile is large enough to keep that risk on the table for the rest of this decade. Permanence, as a legal matter, is a property of the statutory text itself, not a constraint on what a future Congress can do to that text: lawmakers can amend or repeal a permanent provision at any time, through the same ordinary legislative process available for any other law.

Bloomberg Tax has pointed out that the reconciliation mechanics behind the original TCJA sunsets have not gone anywhere. Any future piece of revenue-constrained legislation faces the same reconciliation mechanics that forced the original TCJA sunsets. That pressure compounds if the new temporary provisions get extended further: the Committee for a Responsible Federal Budget projects that making the senior deduction, the tips and overtime deduction, and the auto loan interest deduction permanent would push the law's total cost even higher. The Tax Policy Center has raised a longer-range version of the same concern, warning that deficit accumulation crowds out private investment and slows economic growth, with the bill's fiscal drag expected to worsen after 2031 as temporary spending cuts built into the law expire.

For a practitioner advising on a multi-year plan, the 2028 expiration of the new temporary provisions is the next known cliff, while the permanence of the larger provisions is subject to whatever political economy governs the next reconciliation cycle. The permanence of the larger provisions, the brackets, the standard deduction, the estate exemption, is real in the sense that no expiration date sits in the statute, but it remains subject to whatever political and fiscal pressures shape the next reconciliation cycle. Advisors who treat "permanent" as a synonym for "settled" risk being caught by the next legislative cycle the same way clients were caught anticipating the 2025 cliff. Advisors who treat it as "no expiration date, subject to revision" keep the discipline that served clients well the first time.

Provision-level planning that remains live after OBBBA

Defusing the acute 2025 cliff did not close the file on tax planning. It opened a new one, because the OBBBA changed enough parameters, and introduced enough new temporary provisions, that every major client segment has fresh work to do.

Some clients who rushed into SLATs or outright gifts anticipating reversion of the exemption may have transferred more wealth than they needed to, and revisiting the trust structures and gift strategies built around the now-defunct sunset provisions is warranted. J.P. Morgan Wealth Management advises that even with the exemption permanent and indexed for inflation, it still makes sense to revisit estate plans, since the OBBBA changes the calculus around how and when wealth transfers should happen, not just how much can be transferred. The annual exclusion for 2025 remains a clean planning tool regardless of how the permanent-versus-temporary debate resolves, since gifts within that exclusion never touch the lifetime exemption at all.

For pass-through business owners, the permanent QBI deduction removes the urgency that was pushing some owners toward C-corp conversion, but the underlying analysis still matters for owners above the phaseout thresholds or those running specified service trades or businesses, where the deduction phases out faster. The OBBBA also extended the phaseout range itself. Some owners previously excluded from claiming the deduction at all may now qualify, so it is worth re-running the QBI calculation for anyone close to the old threshold. Windham Brannon notes that entity structure decisions should now be reconsidered in light of the permanent 21% corporate rate alongside the permanent QBI deduction, since neither is going away and the comparison is stable enough to act on.

Capital-intensive businesses gain the most straightforward resolution of the group: full bonus depreciation is restored permanently for property acquired on or after January 20, 2025, which ends the phase-down distortions that had businesses timing purchases around depreciation percentages instead of operational need. The one piece of follow-up work is administrative rather than strategic: practitioners need to confirm which client purchases fall before versus after the January 20, 2025 eligibility date, since that line creates a documentation and classification task that has to be handled purchase by purchase.

High-income filers in high-tax states land in more ambiguous territory. The raised SALT cap is a real increase over the prior limit, but it stops well short of the full deductibility that a straight reversion would have delivered, and clients above the modified AGI threshold see no benefit from the increase at all. Windham Brannon flags that changes to SALT deductibility and AMT exemption phaseouts can interact to expose more taxpayers to AMT. This calculation has to be run client by client. Across every one of these segments, the common thread from before the OBBBA passed remains the operating discipline after it: model each provision on its own terms, for each client's specific facts, rather than assuming a single law, however comprehensive, resolved the exposure once and for all.