Estate Planning · Haute Lawyer Network

What Is a Dynasty Trust?

Last reviewed: October 2026 · Jurisdiction: United States (federal estate, gift and GST tax; state law varies)

A dynasty trust is an irrevocable trust designed to hold and grow family wealth for children, grandchildren and later generations. It is set up to last as long as state law allows, sometimes hundreds of years. If you allocate your federal generation-skipping transfer (GST) tax exemption to it, $15 million per person in 2026, the assets can pass down through generations without estate or GST tax at each generation. In some states it can last indefinitely.

How a dynasty trust works

You fund an irrevocable trust during life (a gift) or at death (through your will or revocable trust).
You allocate GST exemption to the trust, on a timely filed Form 709 gift tax return for lifetime gifts. IRC §2632(c) also automatically allocates unused exemption to certain lifetime transfers to "GST trusts" unless you elect out.
The trustee holds the assets for multiple generations. Trustees often make discretionary distributions to children and grandchildren rather than giving them outright ownership.
Because beneficiaries don't own the assets outright, the trust property is generally not included in their own taxable estates when they die, and the trust can continue to the next generation.

Why the GST exemption is the key

The federal tax code has three transfer taxes: gift, estate, and the generation-skipping transfer tax. The GST tax applies to transfers to "skip persons", such as grandchildren, that would otherwise avoid a layer of estate tax.

The 2026 exemption is $15,000,000 per person. IRC §2631(c) sets the GST exemption equal to the basic exclusion amount. After P.L. 119-21, that amount is $15,000,000 for 2026, indexed for inflation after 2026.
The rate is steep without exemption. The GST tax rate is the maximum federal estate tax rate (currently 40%) multiplied by the trust's "inclusion ratio" (IRC §2641).
A trust fully covered by exemption has an inclusion ratio of zero (IRC §2642). Distributions to grandchildren, and the end of a generation's interest, then carry no GST tax, including on later growth.
Each spouse has his or her own GST exemption. The estate-tax "portability" election does not carry over unused GST exemption, because the GST exemption is tied to the basic exclusion amount (§2631(c)) rather than to the deceased spouse's unused exclusion. See What is portability of the estate tax exemption?

Illustration (arithmetic only, not tax advice):

Fully exempt: you transfer $15,000,000 to a dynasty trust in 2026 and allocate $15,000,000 of GST exemption. The inclusion ratio is 0, so the GST rate on future distributions and terminations is 0%.
Partly exempt: you transfer $20,000,000 and allocate $15,000,000. The applicable fraction is 0.75 and the inclusion ratio is 0.25. The effective GST rate is 0.25 × 40% = 10% on every later generation-skipping transfer from that trust.
This is why planners often use separate exempt and non-exempt trusts.

Dynasty trust states: the rule against perpetuities

How long a trust can last depends on state law. The traditional common-law rule against perpetuities limits a trust to roughly a life in being plus 21 years. Many states have changed that rule. Examples verified from the statutes:

State	What the statute says	Citation
Delaware	No interest in personal property held in trust is void under any perpetuities rule. Real property held in trust must be distributed after 110 years.	25 Del. C. §503(a)–(b)
Florida	Trusts created on or after July 1, 2022: 1,000 years. Trusts created Jan. 1, 2001 through June 30, 2022: 360 years.	Fla. Stat. §689.225(2)(f)
Nevada	Interests must vest or terminate within 365 years (or under the traditional lives-in-being-plus-21 test).	NRS 111.1031
South Dakota	"The common-law rule against perpetuities is not in force in this state."	SDCL 43-5-8

Other states have their own rules, and choosing a state for a trust involves much more than its perpetuities period: trustee location, state income tax, creditor protection and the trust's governing-law clause. An attorney licensed in the relevant state should advise on where to site the trust.

Common features

Spendthrift clause: limits a beneficiary's ability to assign their interest and a creditor's ability to reach it. See What is a spendthrift trust?
Trust protector or directed-trust roles: let someone other than the trustee adjust administrative terms or direct investments over a long horizon. See What is a trust protector? and What is a directed trust?
Decanting authority, where state law allows: lets a trustee move assets into a new trust with updated terms. See What is trust decanting?
Grantor trust status: you pay the trust's income tax during life, which lets more value stay in the trust. See What is a grantor trust?

Trade-offs to weigh

Irrevocability. You give up ownership and, generally, control. Flexibility has to be built into the document.
Long-term administration. Trustee fees, accounting and governance over decades or centuries.
Exemption use. Exemption you allocate here isn't available for other gifts. A partly exempt trust carries GST tax on every later generation-skipping transfer.
Law can change. The exemption amount and state rules are set by legislatures. Current federal figures are from P.L. 119-21.
Pairing with other techniques. A GRAT is a poor fit for GST planning, because GST exemption generally can't be allocated until the annuity term ends (IRC §2642(f)). See What is a GRAT?

Dynasty trust vs. generation-skipping trust vs. SLAT

	Dynasty trust	Generation-skipping trust	SLAT
Main goal	Hold wealth for many generations	Pass assets to grandchildren	Use exemption while a spouse keeps indirect access
Duration	As long as state law allows	Often ends at the grandchildren's generation	Often the spouse's lifetime, then continuing trusts
GST exemption allocated?	Yes, central to the design	Yes	Optional (can be drafted as a dynasty-style trust)

See What is a generation-skipping trust? and What is a SLAT?

Questions to ask an estate planning attorney

How much GST exemption should go to the dynasty trust versus other gifts?
Which state's law should govern the trust, and who should serve as trustee there?
Should the trust be a grantor trust, and can that status be turned off later?
How will we keep the trust fully exempt (inclusion ratio of zero)?
What flexibility tools (trust protector, decanting, powers of appointment) should we include?

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This page is general information, not legal or tax advice. Laws change and vary by state; consult a licensed attorney and tax advisor about your situation.

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