A trust is a legal vehicle through which a strategy is implemented. While the mechanics of trusts are consistent, their structure varies depending on the objective. That is why a trust can be used as a Domestic Asset Protection Trust (DAPT), a Grantor Retained Annuity Trust (GRAT), or a Spousal Lifetime Access Trust (SLAT). The differences in these structures are intentional and are designed to meet the needs of a particular planning situation. Effective wealth management begins with selecting the trust structure that best aligns with your financial goals, family circumstances, and long-term planning objectives, rather than assuming one type of trust is appropriate for every situation.
The SLAT rose in popularity in the early 2010s following a temporary increase in the federal estate tax exemption. During that period, couples had the opportunity to transfer significantly more wealth without incurring estate tax. With the possibility that the increase would revert to lower limits, there was urgency to act.
While the exemption did not revert as expected and was later expanded under the Tax Cuts and Jobs Act, the underlying uncertainty remained. Planning decisions were being made against a shifting policy backdrop. At the same time, state estate tax systems did not always move in parallel with federal law. Historically, state regimes were often tied to federal policy, which allowed for more coordinated planning. As federal law began to shift independently, that alignment broke down. The result was a more complex planning environment, where exposure could exist at the state level even when federal exposure was reduced or eliminated.
The SLAT grew in popularity, and remains a viable planning strategy today, because of its ability to address these dynamics. It allows couples to capture and lock in estate tax exemptions while they are high, without fully severing access to the wealth. The trust terms can be structured so that the beneficiary spouse has access to income or principal, while the transfer itself remains complete for estate tax purposes. It meets the moment when policy uncertainty creates “use it or lose it” pressure and places assets within a bona fide irrevocable trust.
Where a SLAT is administered can be just as important as how it is drafted. While the strategy itself is governed by federal tax law, the trust operates under the laws of the jurisdiction in which it is established. South Dakota has become one of the nation’s leading trust jurisdictions because it provides modern trust statutes, experienced professional trustees, and the flexibility to administer sophisticated irrevocable trusts over long periods of time. For families implementing a SLAT, the jurisdiction is part of the strategy, not merely an administrative detail.
Access to the wealth within a SLAT is dependent on the beneficiary spouse. As with any trust, distributions must follow the terms of the trust and are made at the discretion of the trustee. The grantor no longer controls or owns the assets, marking a clear transfer out of the taxable estate. In practice, access exists, but it is conditional and not within the discretion of the grantor. This separation is what allows the structure to withstand scrutiny if it is ever challenged.
That makes trustee administration especially important; a SLAT must continue operating properly for decades. South Dakota’s sophisticated trust industry and modern fiduciary laws make it well suited for administering long-term irrevocable trusts. The objective is not simply to create a sound estate plan today, but to ensure the structure continues functioning as intended as tax laws, family relationships, and financial circumstances evolve.
Although a SLAT can be an effective strategy, it involves real tradeoffs.
The first is the risk associated with the reciprocal trust doctrine. This arises when spouses establish similar SLATs for each other, often around the same time and with similar assets. In those cases, the IRS may view the arrangement as functionally equivalent to a self-settled trust and include the transferred assets back in the grantor’s taxable estate. This risk can be mitigated by establishing the trusts at different times or funding them with different assets, but it cannot be eliminated entirely. In practice, this creates a tension. Establishing only one SLAT reduces the risk, but it also requires determining which spouse will be the grantor and which will be the beneficiary.
The second is the risk of death or divorce. If the beneficiary spouse dies first, access to the trust is effectively lost. The grantor has no remaining pathway to benefit from the assets and cannot be added as a beneficiary. Divorce creates a similar outcome. The structure that allowed for indirect access no longer exists, and the grantor is left with a completed transfer and no practical benefit from the trust.
The third is loss of control. This is not a possibility but a certainty when using irrevocable trusts. Once the transfer is complete, the trust owns and controls the assets. Their management and distribution are governed by the terms of the trust and carried out by its fiduciaries. Although SLATs are often described as allowing someone to “have their cake and eat it too,” there are real scenarios in which that is not the outcome. Death, divorce, and trustee discretion can all result in a situation where the estate tax planning is successful, but the grantor no longer benefits from the transferred wealth.
High-net-worth couples facing estate tax exposure, whether at the federal or state level, need to be intentional in their planning. There are lawful ways to mitigate that exposure, but every option involves tradeoffs. Choosing the right strategy is only part of the decision. Selecting the right jurisdiction to administer that strategy is equally important.
For many families, that jurisdiction is South Dakota. Its modern trust laws, experienced professional trustees, favorable trust tax environment, strong privacy protections, and flexibility in trust administration have made it one of the country’s premier jurisdictions for irrevocable trusts. Those advantages do not eliminate the tradeoffs inherent in a SLAT, but they provide a legal framework in which sophisticated planning strategies can operate reliably over time.
Estate planning decisions are made in the face of incomplete information. Tax laws change, family circumstances evolve, and planning structures must operate over long periods of time. The success of a SLAT depends on accepting its constraints, not avoiding them, and implementing a structure that can function as intended as those conditions change.