Dynasty Trust: Funding, State Choice, and Tax Costs

A dynasty trust is an irrevocable trust designed to hold family wealth across multiple generations without ever paying federal estate or generation-skipping transfer (GST) tax. You fund it once using your lifetime gift and GST exemptions, and from that point forward the assets and all their growth sit outside every descendant’s taxable estate. For 2026, an individual can move up to $15 million into a dynasty trust, and a married couple can shelter up to $30 million, with the sheltered amount compounding tax-free for grandchildren, great-grandchildren, and beyond.¹

What a Dynasty Trust Actually Does

The federal transfer tax system imposes a 40% tax on estates above the basic exclusion amount, which is $15 million per individual in 2026, with inflation adjustments beginning in 2027.¹ That same figure doubles as the lifetime gift tax exemption and the GST tax exemption.²

A dynasty trust works by using all three of those exemptions at the moment the trust is funded, then keeping the assets outside every beneficiary’s taxable estate from that point forward. If a transfer tax would otherwise hit the family at every generation, a dynasty trust collapses the lifetime cost to zero if structured correctly. The GST tax rate itself is calculated as the maximum federal estate tax rate multiplied by the trust’s inclusion ratio.³ Drive the inclusion ratio to zero, and the GST tax on every future distribution to grandchildren and later generations is permanently zero.

The Zero Inclusion Ratio

The GST tax exists to prevent families from skipping a generation of estate tax by leaving assets directly to grandchildren. It targets transfers to “skip persons,” meaning anyone two or more generations below the person making the transfer.⁴ A dynasty trust neutralizes this tax through the inclusion ratio formula: one minus a fraction whose numerator is the GST exemption allocated to the trust and whose denominator is the value of property transferred.⁵ When those two numbers match, the ratio drops to zero.

Getting this right at funding is non-negotiable. A $15 million transfer paired with a $15 million GST exemption allocation produces a permanent zero inclusion ratio. But if assets are undervalued, or the exemption is only partially allocated, the trust ends up with a fractional inclusion ratio, and a slice of every future generation-skipping distribution will be taxed at 40%. Precise appraisals and careful reporting on IRS Form 709 are what separate a dynasty trust that works from one that leaks tax at every generation.⁶

How to Fund One

Direct Gifts

The simplest approach is a direct gift. You transfer assets, report the transfer on Form 709, allocate the GST exemption, and shelter the full amount under the lifetime gift tax exemption. For cash or publicly traded securities, matching the appraised value to the allocated exemption is straightforward. For closely held business interests, real estate, or other illiquid assets, an independent appraisal is essential, because an undervaluation is what creates a fractional inclusion ratio later. Assets expected to appreciate heavily are the natural candidates: once inside the trust, all future growth is outside your estate and carries the trust’s zero inclusion ratio.

Installment Sale to an Intentionally Defective Grantor Trust

For grantors who want to move more value into the trust than their remaining exemption can cover, the workhorse technique is an installment sale to an intentionally defective grantor trust (IDGT). You first make a “seed gift” to the trust, typically around 10% of the total intended funding, covered by the lifetime gift and GST exemptions. You then sell high-appreciation assets to the trust in exchange for a promissory note bearing interest at the Applicable Federal Rate.⁷

The sale works because the IDGT is treated as a grantor trust for income tax purposes. Under the grantor trust rules, you are treated as the owner of the trust’s assets for income tax purposes, so the sale is ignored by the income tax system entirely.⁸ No capital gains on the sale. No interest income recognized. For estate and gift tax purposes, however, the sale is respected as a legitimate transaction, and the sold assets leave your estate. All appreciation above the AFR passes to the trust’s beneficiaries free of transfer taxes.

Valuation Discounts

If you are transferring interests in a family limited partnership or a closely held business, qualified appraisals can often support valuation discounts for lack of control and lack of marketability. A minority interest with restrictions on transferability is worth less than a pro-rata share of the underlying assets, and the discount reduces the taxable value of the gift. The result: more underlying asset value moved into the trust while consuming less of the $15 million exemption.

Choosing the State

A dynasty trust only works as a multi-generational vehicle if the trust can legally last that long. Under the traditional common-law Rule Against Perpetuities, trust interests must vest within lives in being plus 21 years, which in practice caps most trusts at roughly 90 to 120 years.⁹ A number of states have either abolished the rule or extended it to 360 or 1,000 years, and those states actively compete for trust business.

You do not need to live in the chosen state. You typically just need a trustee located in that jurisdiction. State income tax is the other half of the decision. Several states that permit perpetual trusts also impose no state income tax on trust income, or exempt trusts with no in-state beneficiaries. Measured across centuries, even a modest state income tax rate compounds into a substantial drag, so situs selection combines perpetual duration with favorable state tax treatment as a single decision.

The Powers of Appointment Trap

This is where most dynasty trusts go wrong in the drafting. The whole point is to keep assets out of every beneficiary’s taxable estate, but giving a beneficiary the wrong kind of power over trust property pulls those assets right back in.

A “general power of appointment” is a power that lets the holder direct trust assets to themselves, their estate, their creditors, or the creditors of their estate. If any beneficiary holds a general power over trust assets, those assets are included in that beneficiary’s gross estate at death.¹⁰ That defeats the purpose of the trust and can also destroy the zero inclusion ratio.

A limited or special power of appointment restricts the holder to directing assets only among a defined group that excludes the holder, the holder’s estate, and the holder’s creditors. Limited powers are commonly included so beneficiaries can redirect trust assets among descendants or other family members without triggering estate inclusion. There is one important exception on the general-power side: a power limited by an ascertainable standard relating to health, education, support, or maintenance is not treated as a general power, even if it lets the holder benefit themselves.¹⁰ This is how a beneficiary can also serve as a trustee with distribution authority. The drafting has to be precise. Vague language like “for the beneficiary’s comfort and happiness” does not qualify, and a court could treat it as a general power.

Income Tax Costs You Accept

A dynasty trust eliminates transfer taxes, but it introduces income tax consequences that can be significant.

Compressed Trust Brackets

Trusts hit the top federal income tax bracket at a fraction of the income level that applies to individuals. For 2026, a trust reaches the 37% rate on income above just $16,000, compared to the hundreds of thousands of dollars it takes an individual filer to get there. Undistributed trust income is taxed at the highest rate almost immediately. Distributing income out to beneficiaries in lower brackets manages this, but each distribution reduces the trust’s long-term growth, and the trustee must weigh tax efficiency against the goal of preserving wealth inside the trust.

No Step-Up in Basis

Ordinarily, assets in a decedent’s estate receive a basis step-up to fair market value at death, which erases embedded capital gains. Assets inside a dynasty trust do not get this benefit. The IRS confirmed in Revenue Ruling 2023-2 that assets in an irrevocable grantor trust are not included in the grantor’s gross estate and therefore do not qualify for a stepped-up basis. The trust’s basis stays whatever the grantor’s basis was at the time of transfer. Over multiple generations, that can leave enormous built-in capital gains inside the trust. The core trade-off: you avoid 40% transfer taxes but accept potential income tax on appreciated assets when they are sold.

Grantor Trust Status During Your Lifetime

While the grantor trust rules apply, you pay the income tax on all trust earnings personally. That is actually a benefit. Trust assets grow without being reduced by tax payments, and your tax payments are not treated as additional gifts to the trust.⁸ After your death, the trust becomes a separate taxpayer and the compressed brackets apply.

Creditor and Divorce Protection

Because the trust owns the assets rather than any beneficiary, creditors of individual beneficiaries generally cannot reach trust property. The strength of this protection depends on the distribution language. When the trustee has sole discretion over whether to distribute, creditors cannot compel a payout. If the trust requires mandatory income distributions, creditors can intercept those payments whether or not they have actually been made.

The same principle applies in divorce. A beneficiary’s interest in a purely discretionary dynasty trust is typically not treated as a marital asset subject to division. Mandatory distribution rights may be. This is one reason experienced estate planners favor purely discretionary standards, even though they give beneficiaries less certainty about access. These protections do not extend to assets a beneficiary contributed to the trust themselves. A trust funded by a third party, which is how dynasty trusts are structured by design, is where the strongest protection comes from.

Keeping a Centuries-Long Trust Flexible

A trust intended to last for centuries needs mechanisms to adapt when laws change or family circumstances shift. Several tools allow meaningful flexibility without jeopardizing the trust’s tax status.

Decanting

Decanting allows a trustee to transfer assets from the original trust into a new trust with modified terms, pouring from one vessel into another. Trustees use decanting to update administrative provisions, change the trust’s governing jurisdiction, adjust distribution standards, or correct drafting problems that only became apparent years later. Most states that permit perpetual trusts also have robust decanting statutes, though the scope of permitted changes varies.

Non-Judicial Settlement Agreements

A non-judicial settlement agreement (NJSA) lets all interested parties, including the trustee and the beneficiaries, modify certain terms by agreement rather than going to court. NJSAs are typically limited to administrative provisions and cannot change beneficial interests in ways that would affect the trust’s tax status. They are a faster, cheaper route than a court proceeding for routine updates.

Trustees and Fees

Most dynasty trusts use a corporate or institutional trustee, at least as a co-trustee, to secure professional management and continuity across generations. Corporate trustees typically charge an annual fee based on a percentage of assets, often in the range of 0.25% to 1.5% depending on size and complexity. Over a multi-century trust, those fees compound along with everything else, so investment performance has to exceed the combined drag of fees, taxes on undistributed income, and inflation for the trust to grow in real terms.

Reporting Requirements

Funding a dynasty trust triggers an obligation to file IRS Form 709 for the year of the gift, reporting both the taxable gift and the allocation of the GST exemption.⁶ Getting the GST allocation right on this return is the single most consequential filing step in the entire plan, because that is where the zero inclusion ratio is established. A missed or incorrect allocation can leave the trust partially exposed to GST tax on every future distribution, and fixing the mistake after the fact is difficult and sometimes impossible.

After funding, the trust files its own annual income tax return on Form 1041. While grantor trust status is in effect, the return is informational and the income flows to the grantor’s personal return. Once grantor trust status ends, the trust pays income tax as a separate entity at the compressed trust rates. Distributions of income to beneficiaries are reported on Schedule K-1 and taxed at the beneficiary’s individual rate, which is almost always lower than what the trust itself would pay.

1
Internal Revenue Service. What’s New — Estate and Gift Tax
2
Office of the Law Revision Counsel. 26 USC 2631 – GST Exemption
3
Office of the Law Revision Counsel. 26 US Code 2641 – Applicable Rate
4
Office of the Law Revision Counsel. 26 US Code 2613 – Skip Person and Non-Skip Person Defined
5
Office of the Law Revision Counsel. 26 USC 2642 – Inclusion Ratio
6
Internal Revenue Service. About Form 709, United States Gift (and Generation-Skipping Transfer) Tax Return
7
Internal Revenue Service. Applicable Federal Rates
8
Office of the Law Revision Counsel. 26 USC 671 – Trust Income, Deductions, and Credits Attributable to Grantors and Others as Substantial Owners
9
Legal Information Institute. Rule Against Perpetuities
10
Office of the Law Revision Counsel. 26 USC 2041 – Powers of Appointment