A legacy trust is an irrevocable trust designed to hold assets for children, grandchildren, and later descendants while permanently removing those assets — and all of their future growth — from the federal estate tax. For 2026, an individual can move up to $15 million into this kind of structure without triggering gift tax, and a married couple can shelter up to $30 million combined.1Internal Revenue Service. What’s New – Estate and Gift Tax The trade-off is complete: once you fund the trust, you cannot take the assets back, change the terms, or dissolve the arrangement.
What Sets a Legacy Trust Apart
“Legacy trust” is not a formal legal category. It describes an irrevocable trust — sometimes called a dynasty trust — structured specifically to hold wealth for multiple generations. The defining feature is permanence. A revocable living trust leaves you in full control, so the assets remain in your estate and face estate tax when you die. A legacy trust does the opposite. You give up control, access, and the right to change your mind.
That surrender is what makes the tax treatment work. Under federal law, if you transfer property but keep the right to income from it, or the ability to decide who benefits, the property gets pulled back into your taxable estate at death.2Office of the Law Revision Counsel. 26 USC 2036 – Transfers With Retained Life Estate A legacy trust passes the test because the grantor retains nothing. That clean separation is what lets the assets, and every dollar of appreciation on them, sit outside the estate forever.
The compounding is where the real value lives. If you transfer $5 million into a legacy trust and the investments grow to $50 million over 30 years, the entire $50 million bypasses estate taxation. The longer the trust exists, the more growth accumulates free of estate tax.
The Three Federal Taxes It Addresses
A legacy trust is built to answer three separate tax systems at the same time. Each one behaves differently, and the structure has to be drafted and funded with all three in mind.
Estate Tax
Because the grantor surrenders ownership and control, the transferred assets leave the gross estate permanently. When the grantor dies, those assets are not subject to the federal estate tax, which applies at a flat 40% rate on the taxable portion of an estate. Every dollar of appreciation that occurred inside the trust after funding is also excluded.
Gift Tax on the Initial Transfer
Funding a legacy trust is a completed gift. You are giving assets to the beneficiaries through the trust, and the IRS treats that transfer as a taxable event that must be reported on Form 709.3Internal Revenue Service. About Form 709, United States Gift (and Generation-Skipping Transfer) Tax Return No gift tax is actually owed as long as the value of the transfer falls within your remaining lifetime exemption, which is $15 million for 2026.1Internal Revenue Service. What’s New – Estate and Gift Tax
The One, Big, Beautiful Bill, signed into law on July 4, 2025, set the basic exclusion amount at $15 million for 2026, with inflation adjustments in later years.4Office of the Law Revision Counsel. 26 USC 2010 – Unified Credit Against Estate Tax If the transferred assets exceed your remaining exemption, gift tax of 40% applies immediately to the excess. That makes valuation critical, especially for business interests or real estate. A qualified appraisal has to accompany the Form 709 filing, and aggressive undervaluation invites IRS scrutiny.
Generation-Skipping Transfer Tax
The generation-skipping transfer (GST) tax exists to prevent families from avoiding estate tax by leapfrogging a generation. The GST tax rate equals the maximum federal estate tax rate — currently 40% — and it stacks on top of any other transfer tax.5Office of the Law Revision Counsel. 26 USC Chapter 13 Tax on Generation-Skipping Transfers – Section 2641 Applicable Rate Without planning, a transfer that eventually benefits grandchildren could face both estate tax and GST tax.
The defense is a separate GST exemption, also $15 million for 2026, that the grantor allocates to the trust when funding it. The allocation is reported on Schedule D of Form 709.6Internal Revenue Service. 2025 Instructions for Form 709 When the exemption allocated matches the value transferred, the inclusion ratio drops to zero.7Office of the Law Revision Counsel. 26 USC 2642 – Inclusion Ratio A zero inclusion ratio means no GST tax at funding, no GST tax when distributions pass to grandchildren, and no GST tax when the trust eventually terminates. Failing to make this allocation at funding is one of the most expensive mistakes in this area, because retroactive correction is limited and often impossible.
One point of stability: the IRS has issued final regulations confirming that large gifts made between 2018 and 2025 under the temporarily elevated exemption will not be clawed back if the exemption later decreases.8Internal Revenue Service. Final Regulations Confirm Making Large Gifts Now Won’t Harm Estates After 2025 The estate tax credit at death is calculated using whichever is higher: the exemption when the gift was made or the exemption at death.
The Cost Side: Loss of the Basis Step-Up
This is where the strength of the structure produces its most significant drawback. Assets you own at death generally receive a step-up in tax basis to fair market value on the date of death, wiping out any unrealized capital gains for your heirs. Assets in an irrevocable trust that are excluded from your gross estate do not qualify for that step-up. The step-up rule only applies to property included in the decedent’s gross estate or that passes from the decedent in specific ways the statute enumerates, and legacy trust assets don’t meet those criteria.9Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent
The consequence is real money. Transfer stock with a $1 million cost basis into a legacy trust, watch it grow to $10 million, and the trust or its beneficiaries will owe capital gains tax on $9 million of appreciation when the shares are sold. Kept in your own estate, the same stock would give your heirs a stepped-up basis of $10 million and zero capital gains on an immediate sale.
The math means legacy trusts make the most sense for families whose total wealth comfortably exceeds the estate tax exemption and for assets expected to be held long-term. If your estate is close to the exemption threshold, forfeiting the basis step-up can outweigh the estate tax savings. This calculation, run honestly with an advisor, is the most consequential decision in the entire process.
Income Tax Inside the Trust
Irrevocable trusts pay income tax on retained earnings, and the bracket structure is compressed hard compared with individual rates. For 2026, a trust hits the top federal rate of 37% on taxable income above just $16,000.10Internal Revenue Service. 2026 Form 1041-ES Estimated Income Tax for Estates and Trusts The full schedule for 2026:
- 10% on taxable income up to $3,300
- 24% from $3,301 to $11,700
- 35% from $11,701 to $16,000
- 37% over $16,000
On top of those brackets, trusts also face the 3.8% net investment income tax on income above the top bracket threshold, pushing the effective top rate to 40.8% on retained investment income.10Internal Revenue Service. 2026 Form 1041-ES Estimated Income Tax for Estates and Trusts This is why trustees rarely let income accumulate. The standard move is to distribute income to beneficiaries, who are almost always in lower brackets. The trust deducts the distributed income, the beneficiary reports it, and the trustee issues each beneficiary a Schedule K-1 with the annual Form 1041 filing.11Internal Revenue Service. About Form 1041, U.S. Income Tax Return for Estates and Trusts
Federal regulations also let the trustee elect to treat distributions made within the first 65 days of a new tax year as if they were made on December 31 of the prior year, up to the trust’s distributable net income.12eCFR. 26 CFR 1.663(b)-1 Distributions in First 65 Days of Taxable Year That window gives the trustee time to review year-end figures and push income out to beneficiaries retroactively.
Who Is Involved
A legacy trust needs several clearly defined roles, and getting them right at the outset prevents management gaps that could stretch across decades.
Grantor
The grantor creates and funds the trust, then steps away. You generally cannot serve as the sole trustee of your own legacy trust, and you cannot retain any beneficial interest in the property. Any retained control risks pulling the assets back into your taxable estate.
Trustee and Successor Trustees
The trustee holds legal title, manages investments, and makes distributions within the limits the trust document sets. Because a legacy trust can last a century or more, the document needs a chain of successor trustees who step in automatically when a current trustee dies, resigns, or becomes unable to serve. Many families use a corporate trustee — a bank or trust company — for at least part of the role, since institutions don’t die. Corporate trustee fees typically run between 1% and 2% of trust assets annually, with lower percentages on larger trusts.
Trust Protector
A trust protector is an optional but increasingly common role with narrow, specifically defined powers to adjust the trust when circumstances change. Typical powers include removing and replacing the trustee, modifying the trust in response to new tax laws, changing the state where the trust is administered, and adjusting beneficial interests. The protector has no role in daily management. Whether the protector owes fiduciary duties to the beneficiaries depends on state law, so the document should address it directly.
Beneficiaries
Current beneficiaries receive distributions during their lifetimes. Remainder beneficiaries receive whatever is left when the trust eventually terminates, which could be several generations later. What each group can receive and under what circumstances comes down to how the distribution standard is drafted.
The HEMS Distribution Standard
Most legacy trusts limit distributions to an ascertainable standard tied to health, education, maintenance, and support, known as HEMS. Federal tax law treats a power limited to that standard as not a general power of appointment.13Office of the Law Revision Counsel. 26 USC 2041 – Powers of Appointment The distinction matters enormously. If a beneficiary held a general power of appointment over the trust, the assets would be pulled into that beneficiary’s estate at death, defeating the whole purpose. HEMS gives the trustee enough flexibility to cover real needs while keeping the assets out of beneficiaries’ taxable estates.
What to Put Into the Trust
What you fund the trust with matters as much as the structure itself. The gift tax value is locked in at the time of transfer, and all future appreciation grows free of estate tax, so the ideal assets are those with the highest expected growth relative to their current value.
Highly appreciating assets are the classic choice. Shares in a fast-growing company, private equity interests, or investment real estate that you expect to multiply over the coming decades generate the most tax leverage. Transferring early in the growth cycle locks in the low current value for gift tax purposes.
Closely held business interests are often transferred using valuation discounts for minority ownership and lack of marketability. A 30% interest in a family business is typically worth less for gift tax purposes than 30% of the total business value, because a minority owner can’t force a sale or control operations. Properly supported by a qualified appraiser, these discounts reduce the amount of lifetime exemption consumed by the transfer. Aggressive discounting is one of the most commonly challenged positions on Form 709, so the appraisal work needs to be solid.
Life insurance is often held in a related structure called an irrevocable life insurance trust (ILIT). The ILIT owns the policy and pays premiums from trust funds. When the insured dies, the death benefit passes to the trust free of estate tax. Contributions to the ILIT can qualify for the $19,000 annual gift tax exclusion per beneficiary for 2026 if the trust includes withdrawal rights, commonly called Crummey powers, that give beneficiaries a temporary right to withdraw contributions before they merge into the principal.1Internal Revenue Service. What’s New – Estate and Gift Tax
Every transfer requires formal retitling from the grantor’s name to the trustee’s name. Real estate needs a new deed. Brokerage accounts need account transfers. Sloppy transfers, where legal title never actually changes hands, leave assets in the grantor’s estate despite years of assuming otherwise.
Asset Protection, With Limits
Beyond taxes, a well-drafted legacy trust shields assets from beneficiaries’ creditors, divorcing spouses, and lawsuits. Because the beneficiaries don’t own the assets — the trustee does — and because distributions are limited to HEMS or trustee discretion, creditors generally cannot reach the trust principal.
The protection is not absolute. Transfers made while the grantor has existing debts or pending claims can be challenged as fraudulent conveyances. Under the Uniform Voidable Transactions Act adopted by most states, creditors generally have four years to bring a claim, and some states allow additional time from when the creditor discovers the transfer. The IRS has its own 10-year window for fraudulent conveyance claims. Fund the trust when your financial position is strong and no lawsuits are on the horizon; transferring assets under known liabilities is the fastest way to have a court unwind the entire plan.