A legacy trust works by having one person, the grantor, permanently move assets into an irrevocable trust that a trustee manages for a chain of beneficiaries stretching across generations, with the grantor using federal gift and generation-skipping transfer exemptions to keep those assets outside the transfer-tax system for the entire life of the trust. For 2026, the federal estate and gift tax exemption is $15 million per person, so a married couple can shift up to $30 million into a legacy trust free of federal transfer tax.1Internal Revenue Service. What’s New — Estate and Gift Tax Once the assets are inside, they stay outside every future beneficiary’s taxable estate, so the same wealth can pass from children to grandchildren to great-grandchildren without being taxed again.
What a Legacy Trust Actually Is
“Legacy trust” is a planning label, not a category in any tax code. Estate attorneys usually call the same structure a dynasty trust: a long-term, irrevocable trust built to last many generations rather than terminate at one beneficiary’s death. Two features set it apart from an ordinary irrevocable trust. It is drafted to last as long as state law permits, sometimes indefinitely. And the grantor allocates a federal generation-skipping transfer (GST) exemption to it, which permanently shields the assets from the GST tax no matter how many generations benefit.
The Three Parties and Why Their Roles Matter
Every legacy trust runs on three roles, and the tax treatment depends on each one staying in its lane.
The grantor creates and funds the trust. That transfer is permanent. The grantor gives up ownership and control, and that surrender is precisely what removes the assets from the grantor’s taxable estate. If the grantor retained the right to income or the power to decide who benefits, the IRS would pull the assets back into the estate at death.2Office of the Law Revision Counsel. 26 USC 2036 – Transfers With Retained Life Estate
The trustee holds legal title and manages the assets under the trust document. A trustee is a fiduciary, so personal interests never come ahead of beneficiaries’ interests. For a trust expected to run a century or more, families often choose a corporate trustee because an institution does not die, become incapacitated, or drift.
The beneficiaries are the people who benefit, defined in successive layers: children, then grandchildren, then great-grandchildren, potentially beyond. The trust document sets when and how each generation can receive money.
Funding the Trust
A trust document without assets is just paper. Funding means formally moving ownership of each asset into the trust. Real estate needs a new deed naming the trustee. Bank and brokerage accounts have to be re-registered. Anything left in the grantor’s personal name has not actually entered the trust, whatever the document says.
Transferring assets into an irrevocable trust is a completed gift for federal tax purposes. If the value exceeds the $19,000 annual gift tax exclusion per recipient, the excess counts against the grantor’s lifetime exemption, which is $15 million per person in 2026.3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Most legacy trusts are funded in a single large transfer that uses a substantial slice of that exemption, with the grantor filing IRS Form 709 to report the gift and allocate the GST exemption at the same time.
Timing matters because appreciation after funding grows free of estate tax in the grantor’s estate. A $10 million portfolio that doubles over 20 years produces $10 million of growth that will never appear on a federal estate tax return. The exemption shelters the original gift and all future growth on it.
How the Trust Is Taxed Each Year
A legacy trust is a separate taxpayer. The trustee obtains an Employer Identification Number from the IRS and files Form 1041 each year reporting income, deductions, and distributions.4Internal Revenue Service. About Form 1041, U.S. Income Tax Return for Estates and Trusts How that income is actually taxed turns on whether the trust is a grantor trust or a non-grantor trust.
Grantor Trust Treatment
Many legacy trusts are drafted so the grantor remains responsible for income taxes on the trust’s earnings, even though the grantor no longer owns the assets. The IRS treats the grantor as owner for income tax purposes when the trust includes certain retained powers described in Sections 671 through 679 of the Internal Revenue Code.5Office of the Law Revision Counsel. 26 USC 671 – Trust Income, Deductions, and Credits Attributable to Grantors and Others as Substantial Owners
This is deliberate. The grantor’s tax payments effectively function as an extra tax-free gift to the trust, because the trust’s assets keep growing without being reduced by income taxes, and the IRS does not treat those payments as a separate gift that consumes more exemption.
Non-Grantor Trust Treatment
When the trust is not a grantor trust, or after the grantor dies and grantor trust status ends, the trust pays its own income tax. Trust brackets are steeply compressed: the top federal rate of 37% hits at just $16,000 of taxable income in 2026, while a single individual does not reach that rate until over $640,000.3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Trusts with adjusted gross income above $16,000 also face the 3.8% net investment income tax on undistributed investment income, pushing the effective top rate above 40%.
The primary tool for managing this is distributing income to beneficiaries, who then report it on their own returns at their individual rates. The trustee issues a Schedule K-1 to each beneficiary who receives a distribution, and the beneficiary reports the income on Form 1040.6Internal Revenue Service. Instructions for Schedule K-1 (Form 1041) for a Beneficiary Filing Form 1040 or 1040-SR A beneficiary in the 24% bracket saves the trust 13 percentage points on every dollar distributed compared with paying at the trust’s top rate.
How Distributions to Beneficiaries Work
Legacy trusts rarely give beneficiaries open access to the principal. The trust document grants the trustee discretion to distribute under a defined standard, and the most common is HEMS: health, education, maintenance, and support.
HEMS is more than practical guidance. The Internal Revenue Code provides that a power limited by an ascertainable standard relating to health, education, support, or maintenance is not treated as a general power of appointment.7Office of the Law Revision Counsel. 26 USC 2041 – Powers of Appointment Without that safe harbor, trust assets could be pulled into a beneficiary’s taxable estate, defeating the point of the structure.
In practice, the trustee weighs each distribution request against the standard. Paying a grandchild’s college tuition clearly qualifies. Buying a vacation home is harder to justify. The trust document can also define whether “support” means maintaining the beneficiary’s accustomed standard of living or something more modest, which gives the trustee a clearer framework for borderline requests.
How the Generation-Skipping Transfer Tax Is Neutralized
Without planning, every time wealth passes to a generation two or more levels below the grantor, the IRS imposes a generation-skipping transfer tax on top of any regular estate or gift tax. The GST rate is 40% and is calculated in addition to the estate tax, so an unplanned skip can be devastating.8Office of the Law Revision Counsel. 26 USC 2641 – Applicable Rate
A properly structured legacy trust neutralizes this tax. The grantor allocates GST exemption to the trust at funding, and the exemption equals the basic exclusion amount, $15 million in 2026.9Office of the Law Revision Counsel. 26 USC 2631 – GST Exemption Once allocated, the exemption covers the original assets and all future growth. A trust funded with $15 million that grows to $50 million owes zero GST tax when distributions reach grandchildren or great-grandchildren. The allocation is irrevocable, so getting it right at the outset is critical, and a missed or late allocation can be extraordinarily expensive to fix.
How Long a Legacy Trust Can Last
The common-law Rule Against Perpetuities requires a trust interest to vest no later than 21 years after the death of a person alive when the trust was created. Under the classic rule, that capped trust duration at roughly 90 to 120 years.
Modern legacy trusts sidestep this. About 34 states have either abolished the Rule Against Perpetuities or extended it to 360, 500, or 1,000 years. Where it has been abolished entirely, a trust can theoretically last forever, which is why “dynasty trust” became the popular name. The grantor’s choice of trust situs, meaning the state whose law governs the trust, determines which rule applies. This is why families often domicile a legacy trust in a favorable state even when no family member lives there. Situs also affects state income tax on trust earnings, which some states do not impose at all. The trust document should name the governing state explicitly, and the family usually appoints a trustee located there to anchor the connection.
Building Flexibility Into an Irrevocable Structure
An irrevocable trust sounds rigid, but several mechanisms let a legacy trust adapt over generations without giving up its tax benefits.
Trust Protectors
A trust protector is a third party, separate from the trustee, who holds specific powers meant to keep the trust current. Typical powers include changing the governing state, modifying certain terms, adding or removing beneficiaries, and replacing the trustee. The protector does not manage investments or decide distributions; the role handles the strategic changes a grantor could not have predicted decades earlier.
Directed Trusts
A directed trust splits the trustee’s traditional duties. One party handles administration and tax filing, another manages investments, and sometimes a distribution advisor decides when beneficiaries receive money. About 16 states have adopted the Uniform Directed Trust Act, and others have their own directed trust statutes. The structure lets a family keep investment control with a trusted advisor while using an institutional trustee for administration.
Decanting
Decanting transfers assets from an existing trust into a new trust with updated terms. If the original document has become outdated because of changes in tax law or family circumstances, decanting can fix the problem without going to court. Roughly 29 states have decanting statutes, and the rules vary. Some states limit what can be changed, and extending the trust beyond its original duration is often prohibited.
Choosing a Trustee and What It Costs
For a trust expected to last several generations, the trustee choice is the most consequential decision after funding. An individual trustee, such as a family member, may understand the family’s values but faces real risks: personal liability for investment mistakes, the burden of fiduciary compliance, and the certainty of eventually dying or becoming incapacitated. Individual trustees frequently end up hiring lawyers, accountants, and investment advisors anyway, which erodes any cost advantage.
A corporate trustee, typically a bank or trust company, offers institutional continuity. The entity does not retire, it maintains professional investment and compliance systems, and it brings neutrality that can keep family disputes from derailing the trust. Corporate trustees typically charge annual fees ranging from about 0.50% to 2.00% of trust assets, often on a declining scale where larger trusts pay a lower percentage.
Drafting is substantially more complex than a standard revocable living trust. Legal fees for creating and funding a multi-generational trust generally run from $5,000 to well above $10,000, depending on the assets, the number of generations planned for, and whether the structure includes trust protector provisions, directed trust features, or separate sub-trusts for different family branches.