The $15 Million Question Is Now Permanent: How the OBBBA Rewrote the Estate Playbook

For most of the past decade, estate planning for the very rich ran on a countdown clock. The generous exemption enacted in 2017 was always scheduled to expire at the end of 2025, roughly halving overnight. Every advisor worth their retainer spent years urging clients to gift aggressively before the window slammed shut. Then the window stopped closing.

The One Big Beautiful Bill Act, signed into law last summer, did something the planning industry quietly assumed Congress would never manage: it made the number permanent. Beginning in 2026, each individual can shield $15 million from federal estate and gift tax, or $30 million for a married couple, with the figure indexed for inflation starting in 2027. As Kiplinger has detailed, the generation-skipping transfer exemption rises in lockstep, and the top rate above the threshold holds at 40 percent. The scheduled sunset that framed a generation of planning is simply gone.

The Death of the Deadline

The immediate casualty is urgency itself. The entire architecture of recent gifting advice rested on a single premise: use the exemption now, or watch half of it vanish. That premise no longer holds. A couple who had not yet moved assets into an irrevocable structure has lost nothing, and a couple who rushed to gift $20 million in December 2025 may now be wishing they had kept some of that capital, and some of that flexibility, closer to hand.

This is not a small psychological shift. Removing a hard deadline changes what "optimal" means. When the clock was ticking, the cost of waiting was measured in millions of forfeited exemption. Now the cost of waiting is close to zero, which means the real question becomes not when to give but whether a given structure still earns its keep once the tax pressure that justified it has eased.

Permanence is a strange gift: it removes the excuse for acting, and forces families to justify the plan on its merits.

SLATs and Dynasty Trusts, Reconsidered

Spousal lifetime access trusts were the deadline era's signature move, a way to lock in the exemption while keeping a spouse's indirect access to the assets. Many were assembled at speed, sometimes as near-mirror images of each other, a construction that invites unwelcome IRS attention under the reciprocal trust doctrine. With permanence in place, there is finally room to build these vehicles deliberately rather than defensively, or to unwind the ones that were bolted together under duress and never truly fit the family.

Dynasty trusts tell a similar story. Their appeal was never solely about beating a sunset; it is about compounding wealth across generations outside the transfer-tax system entirely. That logic survives intact, arguably strengthened, because families can now fund them on a considered timeline instead of front-loading everything into a single panicked tax year. The smart money is treating the permanent exemption not as a reason to do less, but as license to sequence gifts thoughtfully, coordinate them with valuations and liquidity events, and stop letting the calendar dictate the strategy.

Permanent Until It Isn't

A note of realism belongs here. "Permanent" in tax law means only that no expiration date is written into the statute; it does not mean immune to a future Congress with different priorities and a different arithmetic. The prudent read is that families now have breathing room, not a guarantee. Structures worth having under a $15 million exemption should be structures that still make sense if a later administration decides $15 million was too generous.

What has genuinely changed is the tenor of the conversation. For years, the wealthy were sold urgency. Now they are being sold judgment, and the difference is enormous. The families who navigate this well will not be the ones who reacted fastest to a deadline, but the ones with the best counsel in the room before the questions even arise, the private advisors, peers, and quiet networks where a change of this magnitude is understood and acted upon months before it filters down. In wealth, as in everything, the advantage was never the information. It was proximity to the people who had it first.