Forever Is Not a Fortress.

Most of that promise is true. The dangerous part is what a reader may infer from it: that a trust which can last forever will also hold up against creditors forever. Duration and protection are different properties. One comes from a perpetuities statute. The other comes from how the trust is drafted, when it is funded, and who actually runs it. A family that buys the first property and assumes it got the second has confused the calendar with the fortress.

The statute is short and worth reading correctly, because the popular account gets the section wrong. The provision that ended the old rule is SDCL § 43-5-8: “The common-law rule against perpetuities is not in force in this state.” It was enacted as Session Laws 1983, chapter 304, § 4. The provision some articles cite instead, § 43-5-1, did not abolish anything. It restates a different and older rule. The “absolute power of alienation” may not be suspended for longer than lives in being plus thirty years (S.D. Codified Laws § 43-5-1, as amended SL 1983, ch 304, § 6).

South Dakota kept that rule against suspending the power of alienation, and a trust avoids it through § 43-5-4. The power is not suspended “if the trustee has power to sell, either expressed or implied, or if there is an unlimited power to terminate in one or more persons in being” (S.D. Codified Laws § 43-5-4, as amended SL 1983, ch 304, § 8). In practice, a perpetual South Dakota trust stays valid because its trustee can always sell. The permanence is conditional. It depends on drafting that keeps the assets marketable, and a trust instrument that forbids sale, or ties up an asset in ways the trustee cannot undo, gives up the protection the statute provides.

This is lawyers’ detail, but it carries a planning lesson. Even the feature South Dakota is best known for comes from how the instrument is drafted. The legislature removed a deadline. It did not write anyone’s trust.

The timing also matters. South Dakota acted in 1983, three years before Congress created the modern generation-skipping transfer tax. The empirical study of this market, by Robert Sitkoff and Max Schanzenbach, found that the rush to abolish the Rule came after 1986. States competed for dynasty trusts so donors could use the GST exemption indefinitely. Through 2003, abolishing the Rule increased a state’s reported trust assets by about $6 billion on average (roughly 20 percent), and about $100 billion in trust funds moved to take advantage of it. The authors also found that states which taxed trust income from out-of-state trusts saw no observable increase in trust business after abolishing the Rule (Robert H. Sitkoff & Max M. Schanzenbach, Jurisdictional Competition for Trust Funds: An Empirical Analysis of Perpetuities and Taxes, 115 Yale L.J. 356, 356 (2005) (abstract)). Money moved toward duration and a favourable tax climate. Duration alone did not draw it.

Duration buys a tax result. For 2026, the federal estate, gift, and GST exemption is $15 million per person under the 2025 reconciliation act, commonly called the One Big Beautiful Bill Act, and the GST exemption tracks the basic exclusion amount (I.R.C. § 2010(c)(3) (basic exclusion amount of $15,000,000 for 2026, as amended by Pub. L. No. 119-21 (2025)); I.R.C. § 2631(c) (GST exemption equal to the basic exclusion amount)). Exemption allocated to a trust that never ends can shelter the trust’s assets, and their growth, from transfer tax at each generation for as long as the trust lasts. A trust that must end after lives in being plus twenty-one years gives up that shelter at a fixed point. A perpetual trust does not.

Duration also buys continuity. It avoids the forced distribution at the end of a limited term, which in older trusts often delivered a large lump sum to a beneficiary who was not ready for it, or who had a divorce, bankruptcy, or judgment pending.

Duration does not buy creditor protection. A trust that lasts four hundred years but gives a beneficiary a fixed right to income, a power to demand principal, or control over the trustee lasts four hundred years as a source of recovery for that beneficiary’s creditors. In that case the length of the trust only extends how long creditors can reach it.

South Dakota does offer strong protection, but it lives in different chapters of the code and depends on the trust using them.

The discretionary interest. Under SDCL § 55-1-43, a discretionary interest “is neither a property interest nor an enforceable right. It is a mere expectancy.” “No creditor may force a distribution” of it, and no creditor “may require the trustee to exercise the trustee’s discretion to make a distribution.” A court may review the trustee’s discretion only if the trustee acts dishonestly, acts with an improper motive, or fails to act when it has a duty to. The statute expressly says a “reasonableness standard may not be applied” (S.D. Codified Laws § 55-1-43 (SL 2007, ch 280, § 20; SL 2009, ch 252, § 11)). The legislature also stated that it keeps the common-law line between discretionary and support trusts and affirmatively rejects contrary positions in the Restatement (Third) of Trusts and the Uniform Trust Code (S.D. Codified Laws § 55-1-25 (SL 2007, ch 280, § 2; SL 2015, ch 240, § 11)).

A lawyer should read that pairing slowly. The protection attaches to a discretionary interest. A trust that promises “all net income to my son for life” has created a support-style or mandatory interest, and it does not get the full benefit of § 55-1-43 just because it is sited in Sioux Falls. The protection comes from giving the trustee real discretion.

The trustee’s independence. Discretion is only as good as the person who holds it. If a beneficiary can remove the trustee at will and appoint a compliant replacement, or serves as trustee over distributions to himself, a court will ask whether the “discretion” is real. South Dakota’s statutory scheme expects a genuine fiduciary. The rules on dishonesty and improper motive assume someone whose motives can be tested. The state’s trust industry is a real one, with 114 chartered trust companies at the end of 2025, 69 public and 45 private (Dircks, supra). The planning point is that the structure should actually use a real, independent fiduciary, not simply hire a nominal agent for situs.

Timing, for the settlor’s own assets. South Dakota has also allowed self-settled asset protection trusts since its Qualified Dispositions in Trust Act of 2005 (S.D. Codified Laws ch. 55-16 (SL 2005, ch 261)). For a settlor’s own creditors, the fraudulent-transfer attack under that Act is “extinguished” unless brought within tight windows. For a later creditor, that window is two years after the transfer. For an existing creditor, it is the later of two years after the transfer or six months after the creditor discovered it or reasonably could have, and the creditor must prove its case by clear and convincing evidence (S.D. Codified Laws § 55-16-10, as amended through SL 2026, ch 198, § 7). Those are real advantages. However, they help a settlor who funded the trust while solvent and with no claim in sight. A transfer made after a claim is already known is still a transfer after a claim is known, whatever state holds it.

The line that non-residents can use South Dakota trusts is accurate for the trust law. It needs two caveats that popular coverage usually drops.

First, the settlor’s home state may not accept South Dakota’s rules. For a self-settled trust in particular, a non-resident settlor sued at home, or in a federal bankruptcy court, may find that the forum applies its own public policy instead of South Dakota’s statute. Federal bankruptcy law adds its own ten-year reach-back for transfers to self-settled trusts made with actual intent to hinder, delay, or defraud (11 U.S.C. § 548(e)(1)). Courts have refused to apply a distant state’s asset-protection statute to a debtor who had no real connection to it, as in In re Huber, 493 B.R. 798 (Bankr. W.D. Wash. 2013). Using a trust-friendly state is lawful. Using it as a stand-in for real planning is the mistake.

Second, the tax result depends on where the people are, not only where the trust is sited. South Dakota has no personal income tax, but the settlor’s or beneficiaries’ states may still tax the trust. The U.S. Supreme Court held in Kaestner that North Carolina could not tax a trust’s undistributed income based only on an in-state beneficiary who had not received that income, had no right to demand it, and could not count on receiving it (North Carolina Dep’t of Revenue v. Kimberley Rice Kaestner 1992 Family Trust, 588 U.S. 262 (2019)). The Court limited that holding to its facts. States that tax based on the settlor’s residence, an in-state trustee, or in-state administration were not addressed. A trust that keeps an in-state co-trustee, or lets the family adviser make decisions from the family’s home state, may bring back the state tax that the move to South Dakota was supposed to avoid. Real administration in South Dakota is part of both the protection and the tax result.

The $906 billion figure reflects a real market, not a fad, and there are sound reasons to site a long-term family trust in a jurisdiction that allows it to last. But families should judge the structure by what the trust says and how it is run, not by where it is located. The questions worth asking about any existing or proposed dynasty trust are narrower than “is it in South Dakota?”:

1. Is each beneficiary’s interest truly discretionary? Or does the instrument contain mandatory income, ascertainable-standard support language, or withdrawal rights that give creditors something to reach?

2. Who can remove and replace the trustee, and with whom? A removal power limited to an independent successor protects the discretion. A power to install oneself or a close relative weakens it.

3. Does the trustee have a real power of sale over every asset? Under § 43-5-4, that power keeps a perpetual trust valid. Restrictions on selling the family business or legacy real estate should be drafted with that statute in mind.

4. Where is the trust actually administered? Decisions made, records kept, and fiduciaries located in South Dakota support both the choice of law and the state-tax position. A South Dakota name over administration done somewhere else supports neither.

5. When was it funded, and by whom? A third-party trust funded by a parent for descendants is on the strongest footing. A settlor’s own transfers are only as good as the settlor’s solvency and the absence of known claims on the day the assets moved.

None of these questions depends on the trust lasting forever. All of them depend on the discipline that Lighthouse has always treated as the core of protection: structures that are seasoned, irrevocable and discretionary, and independently administered. The perpetuities repeal lets a well-built trust keep those qualities for generations. It cannot supply them if they are missing.

South Dakota’s 1983 amendment was a single sentence that ended a very old rule. Forty-three years later, it supports a trust industry of close to a trillion dollars, which shows how much families value continuity. The same statute book also shows what the sentence did not do. The protection is in the discretionary-interest statute, in a trustee’s independence, and in funding made well before any claim arrived.

A trust can outlast everyone who created it. It will protect the family only if it was designed and administered to do so from the start.