Dynasty Trust Planning

A dynasty trust is an irrevocable trust structured to pass wealth across multiple generations—typically 100+ years—while minimizing estate taxes, gift taxes, and generation-skipping transfer taxes. The beneficiary list typically spans children, grandchildren, great-grandchildren, and future generations.

Why dynasty trusts exploit the generation-skipping transfer tax system

The federal estate tax allows a $13.6 million lifetime exemption (2024). When someone dies, amounts above this threshold face 40% tax. Naively, a wealthy person might transfer $13.6M to a child, then $13.6M to a grandchild, paying tax at each generational step. A dynasty trust circumvents this.

A dynasty trust is created with a single generation-skipping transfer tax (GST) exemption of $13.6M per grantor. That $13.6M, plus all its appreciation, can pass through the trust to multiple generations without incurring GST tax at any level. If the trust grows from $13.6M to $100M over 30 years, the entire $100M can be distributed to great-grandchildren without any GST tax—a massive wealth transfer advantage.

The mechanism: once the $13.6M exemption is “allocated” to the dynasty trust, all future distributions to skip persons (grandchildren, great-grandchildren, etc.) are tax-exempt. This is called “exempt trust” status.

Mechanics: the rule against perpetuities and perpetual trusts

Historically, trusts were limited by the “rule against perpetuities,” which voided trusts lasting longer than “lives in being plus 21 years” (~100 years). This rule prevented the concentration of wealth in perpetual trusts that removed assets from the estate tax base forever.

In the 1990s, states began repealing the rule against perpetuities. Delaware, Nevada, South Dakota, and Wyoming led this charge, creating “perpetual trust” statutes. A wealthy person could now create a trust in one of these states and allow it to endure forever without termination. Coupled with a $13.6M GST exemption, this allowed the transfer of dynasty assets to multiple future generations without ever depleting the exemption.

For example: A grandparent creates a South Dakota dynasty trust with $13.6M in assets, allocating their full GST exemption. The trust earns 6% annually for 30 years, growing to ~$78M. All distributions to grandchildren and great-grandchildren are GST-exempt. The trust itself never terminates and can continue for centuries.

Portability and exemption stacking

The unlimited marital deduction allows spouses to transfer unlimited amounts to each other tax-free. When one spouse dies, their unused GST exemption is “portable” to the surviving spouse (as of 2013’s ATRA). This allows a married couple to combine exemptions: $13.6M + $13.6M = $27.2M (2024).

A typical strategy: a high-net-worth married couple creates a joint dynasty trust and funds it with $27.2M, allocating both spouses’ full GST exemptions. The trust grows over decades and passes to children and grandchildren entirely GST-exempt. If the couple had instead transferred assets to the child (not the trust), the grandchild’s inheritance would be subject to GST tax; the dynasty trust avoids it.

The trustee discretion and distribution control

Dynasty trusts typically vest broad discretion in the trustee to distribute or retain income and principal. A family member or professional trustee decides when to distribute funds to beneficiaries. This serves two purposes:

1. Tax deferral: Retaining income in the trust keeps income within the trust’s tax bracket, potentially lower than the beneficiary’s. The trust can accumulate income and defer distributions until a beneficiary needs funds or faces a lower tax rate.

2. Asset control: The trustee prevents individual beneficiaries from squandering inherited wealth. A reckless grandchild cannot demand the entire $78M; the trustee distributes at their discretion.

This discretion creates a peculiar situation: the beneficiaries are not true owners. They have an “income interest” or “distribution right,” but not the absolute right to call the assets. This preserves family discipline across generations and protects assets from creditors or divorcing spouses.

State law and choice-of-law strategy

Dynasty trusts must be created under the laws of a perpetual-trust state. A trust created under New York law (which has a rule against perpetuities) cannot serve as a dynasty trust; a trust created under South Dakota law can.

Smart planning: a wealthy person creates the trust in South Dakota (or another dynasty-friendly state) even though they live elsewhere. The South Dakota trustee and South Dakota law apply, allowing perpetual trust status. The settlor can include an “in-state trustee requirement” (any trustee must be a South Dakota resident), which locks the trust to South Dakota law indefinitely.

This is called “situs planning” and creates significant tax savings, especially for non-resident settlors. A California resident who creates a South Dakota dynasty trust avoids California’s strict rule against perpetuities and benefits from South Dakota’s perpetual trust statute and lower trustee fees.

Downside risks and complications

Unfunded exemptions and “claw-back” risk

Dynasty trusts lock in the federal estate tax exemption in effect when the trust is created. The 2024 exemption is $13.6M; but it is scheduled to fall to ~$7M in 2026 (TCJA sunset). If a dynasty trust is over-funded today, the excess above future exemptions faces potential “claw-back” (retroactive taxation). Conservative planners under-fund trusts or implement “decanting” strategies (moving funds to new trusts) to address future exemption changes.

State and federal tax complexity

Dynasty trusts create complex income-tax consequences. The trust itself is a separate taxpayer subject to compressed tax brackets. Income retained in the trust is taxed at rates that hit the 37% bracket at ~$14,000 of income (2024), compared to $578,000+ for individuals. Distributions to beneficiaries trigger DNI (distributable net income) pass-through, and the beneficiary’s state of residence determines state income tax on distributions.

Many dynastic families end up paying more in state and federal income tax due to compressed trust brackets than they save in GST taxes.

Creditor and divorce exposure

While the trustee has discretion, creditors of beneficiaries can sometimes pierce trusts and claim distributions. “Spendthrift” provisions (standard in modern trusts) provide some protection, but state law varies. Additionally, in a divorce, a spouse might claim a beneficiary’s interest is marital property. Though the beneficiary does not own the trust, a court might award a portion of expected distributions as an offset to the non-beneficiary spouse.

Regulatory scrutiny

The IRS has become more aggressive in auditing large dynasty trusts, especially those using questionable valuation discounts (discounting family-business interests before funding the trust). Regulators also scrutinize “intentionally defective grantor trusts” (IDGTs) paired with dynasty trusts, where the grantor retains certain tax powers while transfers are deemed complete for gift tax purposes.

Dynasty trust alternatives: non-grantor trusts and spousal-access trusts

Dynasty trusts are not the only multi-generational strategy. Alternatives include:

• Non-grantor trusts: The settlor is not treated as the trust’s owner for tax purposes, allowing income taxation at the trust level without beneficiary inclusion.
• Spousal Lifetime Access Trusts (SLATs): A newer strategy where a spouse creates a trust for the other spouse and descendants, allowing discounting and leveraging the unlimited marital deduction.
• Grantor Retained Annuity Trusts (GRATs): Short-term trusts that return an annuity to the grantor, with remainder to descendants. Growth above IRS rates is exempt from gift tax.

Each has different tax consequences and flexibility profiles.

The forever family office: dynasty trust evolution

In practice, dynastic families often evolve their trusts over time. Initial trusts capture $13.6M in GST exemptions; over decades, as exemptions reset or decline, families may create new trusts with new exemption allocations, “decant” funds to new structures, or modify trustee powers via trust protector amendments.

The most sophisticated families establish “dynasty trust offices”—professional management structures that oversee multiple trusts, coordinate trustee decisions, and ensure tax compliance across generations.