Why Wealthy Families Are Establishing South Dakota Trusts

Is South Dakota the Best State for Trusts for Wealthy Families?

Protecting and growing significant wealth takes more than good investment returns. It takes thoughtful structural planning, the kind of decisions that don’t show up on a quarterly statement but compound for decades and generations afterward.

For wealthy families across the United States, South Dakota has become the leading destination for trust planning. 

The state’s combination of no income tax, perpetual dynasty trusts, the strongest privacy protections in the country, and unmatched asset protection statutes has earned it the top spot in trust jurisdiction rankings year after year. 

But the reason South Dakota matters to wealthy families isn’t really the list of features. It’s what those features actually do for the lives of the people inside the trust.

This guide walks through why South Dakota has emerged as the jurisdiction of choice — and, importantly, what the right structure looks like at different levels of wealth.

Key Takeaways

• South Dakota has become the preferred jurisdiction for wealthy families across the U.S., combining no state income, capital gains, or inheritance tax with perpetual dynasty trusts, unmatched privacy protections, and the strongest asset protection statutes in the country.
• The right trust structure depends on your wealth tier and goals. A family with $10M needs something different from a family with $200M. Directed trusts, dynasty planning, private family trust companies, and family governance provisions all become more relevant as wealth and complexity grow.
• Trust planning at this level isn’t just about taxes. It’s about control, privacy, generational continuity, and how wealth shapes the lives of the people who inherit it. South Dakota’s legal framework offers the most complete toolkit for addressing all of these concerns.

What “Wealthy” Actually Means in Trust Planning

“Wealthy” isn’t a single category. A family with $10 million has very different needs than a family with $200 million, and both are different again from a family with $1 billion. Trust planning at each level looks different, and a thoughtful approach starts with knowing which tier you’re really in.

For the purposes of this guide, we’ll use the wealth tiers commonly cited in industry reports like Knight Frank’s Wealth Report and Capgemini’s World Wealth Report:

• High net worth (roughly $5M–$25M of investable assets). At this level, federal estate tax exposure is real (the federal exemption is scheduled to drop substantially after 2025, putting more families in scope), and the asset protection and tax planning conversations start to have meaningful dollar weight.
• Very high net worth (roughly $25M–$100M). Here, state income tax on retained trust income becomes a significant ongoing cost, and structures like directed trusts and multi-generational dynasty planning produce real economic value.
• Ultra-high net worth (roughly $100M+). At this level, the conversation expands beyond tax efficiency into family governance, private family trust companies, and the privacy and continuity issues that come with wealth that will outlive the people who created it.

These are different tiers and require different toolkits, but South Dakota law accommodates all of them.

Why South Dakota for Your Trust Situs?

South Dakota has spent four decades methodically refining its trust laws. The state was the first to abolish the rule against perpetuities (in 1983), the first to enact directed trust legislation, and has remained at the front of the pack on decanting, asset protection, and privacy ever since. A Governor’s Task Force on Trusts meets annually to keep the state’s laws ahead of the field.

The result: South Dakota consistently ranks #1 in independent assessments of U.S. trust jurisdictions, including the widely cited Oshins Dynasty Trust State Rankings. Trade publications and major financial media – Forbes, Fortune, and others – have repeatedly highlighted the state’s role as the leading domestic trust jurisdiction.

For wealthy families, that ranking matters because it reflects a stable, long-term commitment from the state. Trust planning operates on a multi-decade horizon. A state that has spent forty years getting this right, and continues to refine it’s trust laws, is a different proposition than a jurisdiction that’s just recently entered the conversation.

The Core Advantages and Benefits to You

1. No State Income, Capital Gains, or Inheritance Tax

South Dakota imposes no state income tax, no capital gains tax, and no inheritance or estate tax on trust assets. For a trust holding income-producing assets, the savings compound dramatically over time.

What this means in practice: Consider a $25M trust earning a 6% return. That’s roughly $1.5M of annual income. In a state with a 10% trust income tax (California, for example, taxes trust income based on factors that often pull a trust into its tax net), that’s roughly $150,000 of state tax per year. Reinvested at the same rate over 30 years, those payments would have grown to several million dollars of additional trust assets. Over a multi-generational dynasty trust, the figure runs into the tens of millions.

The dollar weight only grows with the size of the trust. For a $200M trust, the same math produces annual state tax savings that easily fund philanthropic distributions, support family members, or simply continue to compound inside the trust.

(One important caveat: some states tax trust income based on the residence of the grantor or beneficiaries, not the trust’s situs. This is addressed this in the FAQ at the bottom of this article.)

2. Perpetual Dynasty Trusts

South Dakota was the first state in the country to abolish the rule against perpetuities, which means trusts created in South Dakota can last indefinitely. Other top jurisdictions have followed, but South Dakota’s track record is the longest.

What this means in practice: Most wealthy families have heard of dynasty trusts, but the full implications of “indefinitely” are easy to underestimate. With current federal gift and GST exemptions, a family can gift a meaningful amount of wealth into a dynasty trust today, fully exempt from future estate and GST tax, and have those assets grow inside the trust for hundreds of years, funding education, housing, business ventures, and philanthropy for descendants who haven’t been born yet.

For a family at the $100M+ level, the planning math here is enormous. For a family at the $10M–$25M level, it’s still meaningful, particularly given that the federal estate tax exemption is scheduled to drop materially after 2025, putting many more families into the tax net.

3. The Strongest Asset Protection in the U.S.

South Dakota’s domestic asset protection trust (DAPT) statutes are among the strongest in the country, with a short statute of limitations on creditor claims and broad protection against most categories of claims, including divorce-related claims in many circumstances.

What this means in practice: This is the concern most wealthy families don’t talk about openly but think about constantly. A surgeon worried about malpractice exposure. A real estate developer worried about a single project’s liability. A founder whose company might one day face product or employment claims. An adult child whose marriage shows strain. South Dakota’s framework is designed to protect family wealth from these scenarios when properly structured in advance.

It’s worth being honest about what asset protection trusts do and don’t do. They don’t help once a claim is already on the horizon. Fraudulent transfer rules apply. But used proactively, well before any specific exposure exists, they provide a layer of protection that’s difficult to match in other jurisdictions.

4. Privacy That Holds Up Under Pressure

South Dakota has the strongest privacy protections of any U.S. trust jurisdiction. Trust litigation can be sealed by court order, and unlike many states, that seal is automatic, permanent, and not subject to expiration. Trust documents are not filed with the state, and beneficiary information is not publicly accessible.

What this means in practice: For most wealthy families, privacy isn’t paranoia, it’s about being smart. A founder selling a company doesn’t want the local paper running a feature on the size of their newly liquid estate. A public company executive doesn’t want their family’s wealth becoming a topic at the next board meeting. A high-profile professional doesn’t want their children’s inheritance becoming a story.

This matters even more when wealth becomes generational. A great-grandchild three generations from now should not have their inheritance discoverable by a journalist, a litigant, or a future spouse without their consent. South Dakota’s privacy framework is built for exactly this kind of multi-generational discretion.

5. Directed Trusts and Structural Flexibility

South Dakota pioneered directed trust legislation, which allows the grantor to separate the traditional trustee role into distinct functions:

• An investment advisor or committee managing the assets.
• A distribution committee or trust protector controlling distributions.
• An administrative trustee handling recordkeeping, tax filings, and operations.

What this means in practice: Wealthy families often have a long-standing investment advisor, family office, or hedge-fund manager they want to keep managing the assets. They also want institutional-quality administration without forcing their existing advisor to be replaced. Directed trusts let the family keep the relationships they’ve built while gaining the protections of South Dakota law.

For families with operating businesses, concentrated stock positions, real estate portfolios, or unusual asset mixes, this flexibility is often the deciding factor in choosing South Dakota over alternative jurisdictions.

6. Private Family Trust Companies (PFTCs)

For families at the ultra-high-net-worth level, South Dakota is one of the leading jurisdictions for forming a Private Family Trust Company, a regulated entity that serves as trustee for a single family’s trusts.

What this means in practice: A PFTC gives a family institutional governance, like committees, formal recordkeeping, and independent oversight, while keeping decision-making within the family or its trusted advisors. For families with the wealth and complexity to support it (typically $100M+), a PFTC is often the structure of choice. South Dakota’s PFTC framework is among the most developed in the country.