How trusts can lower your estate tax bill

A trust can reduce estate tax by moving assets out of your taxable estate during your lifetime or by splitting the tax burden between spouses. The most common approach is an irrevocable life insurance trust (ILIT), which removes life insurance proceeds from your estate. Another is a bypass trust (also called a credit shelter trust), which lets married couples use both spouses' federal exemptions instead of losing one when the first spouse dies. A grantor retained annuity trust (GRAT) can shift future growth to heirs with minimal gift tax cost. The strategy that makes sense depends on your estate size, whether you are married, and how much control you want to keep over the assets.

Trusts do not eliminate estate tax on their own — they are a structure that holds assets in a way the tax code treats differently than individual ownership. The tax savings come from either removing assets from your taxable estate entirely, or from using exemptions more efficiently. If your estate is below the federal exemption (which is $13.61 million per person in 2024, but is scheduled to drop to roughly $7 million in 2026), a trust may not save you federal tax at all. State estate taxes, which exist in about 17 states, have much lower thresholds and are where trusts often deliver real savings.

Key Takeaways

  • An irrevocable life insurance trust removes life insurance death benefits from your taxable estate, which can save hundreds of thousands in tax if the policy is large.
  • A bypass trust lets a married couple use both spouses' federal exemptions, preventing the second spouse's exemption from being wasted when the first dies.
  • Trusts only reduce federal estate tax if your estate exceeds the exemption threshold, but they can save state estate tax in states with lower limits.
  • Once you fund an irrevocable trust, you cannot change your mind or take the assets back, so this strategy requires certainty about your long-term plans.
  • A trust is a legal document that must be drafted carefully and funded properly — straightforward naming it in your will does not set up its tax benefits.

Irrevocable life insurance trusts (ILITs)

An ILIT is a trust that owns a life insurance policy on your life. When you die, the death benefit goes to the trust, not to your estate. This keeps the proceeds out of your taxable estate, which can save 40% in federal tax plus state tax on a large policy. For example, a $2 million policy in your personal name adds $2 million to your taxable estate; the same policy owned by an ILIT does not.

To set up an ILIT, you work with an attorney to draft the trust document, then explore for a new policy in the trust's name (you cannot transfer an existing policy to an ILIT and get the same benefit — there is a three-year lookback period). The trust pays the premiums, which you fund by making gifts to the trust. Those gifts use your annual gift tax exclusion (currently $18,000 per person per year) or your lifetime exemption. The trustee — often a family member or professional — manages the policy and collects the death benefit when you die.

The main trade-off is control. Once the trust is irrevocable, you cannot change the beneficiaries, borrow against the policy, or cancel it. If your circumstances change — you remarry, have more children, or your health improves and you no longer need the insurance — you are stuck. This is why an ILIT makes most sense when you are certain you want the death benefit to go to specific heirs and you want to lock in that plan.

Bypass trusts for married couples

A bypass trust (also called a credit shelter trust or family trust) is designed to use both spouses' federal exemptions. Without it, many married couples waste the first spouse's exemption. Here is why: when the first spouse dies, their assets pass to the surviving spouse tax-free under the unlimited marital deduction. But that means the first spouse's exemption is never used. When the second spouse dies, only the second spouse's exemption applies to the combined estate.

A bypass trust solves this by splitting assets at the first death. Assets up to the first spouse's exemption amount go into the bypass trust for the benefit of the surviving spouse and children. The surviving spouse can receive income from the trust and, in some cases, principal. When the surviving spouse dies, those assets pass to the children outside the surviving spouse's taxable estate. The rest of the estate passes to the surviving spouse outright and uses the marital deduction.

Example: A married couple has a $20 million estate. The first spouse dies in 2024. Without a bypass trust, $13.61 million goes to the surviving spouse tax-free (using the first spouse's exemption), and $6.39 million goes into a bypass trust. When the second spouse dies, the $13.61 million in the bypass trust is not taxed again, and the surviving spouse's $13.61 million exemption applies to their remaining assets. If there is no bypass trust, the second spouse's exemption is wasted on assets that were already sheltered by the marital deduction.

Bypass trusts are set up in your will or revocable living trust and are created automatically at the first death. You do not need to fund them during life. The downside is that the surviving spouse's access to the trust assets is limited by the trust terms — they cannot straightforward withdraw money whenever they want, and the trustee has discretion over distributions. This can create friction if the surviving spouse needs liquidity or wants to change the plan.

Grantor retained annuity trusts (GRATs)

A GRAT is a trust that lets you shift future asset growth to your heirs with little or no gift tax. Here is how it works: you fund the trust with assets expected to grow (often stocks or real estate), and the trust pays you an annuity — a fixed payment — for a set term, usually two to ten years. At the end of the term, whatever is left in the trust goes to your heirs tax-free.

The gift tax value of a GRAT is calculated by subtracting the present value of the annuity payments you will receive from the value of the assets you put in. If the assets grow faster than the IRS interest rate used in the calculation, the excess growth passes to your heirs without using any of your exemption. If the assets grow slower than expected, you straightforward get back what you put in, and no gift tax is owed. This is why a GRAT is sometimes called a "heads I win, tails I break even" strategy.

GRATs work best when you expect strong growth in a short time — for example, if you own a business about to have a liquidity event, or if you have concentrated stock holdings. They are complex to set up and require annual tax filings. If you die during the GRAT term, the assets come back into your estate, so the strategy only works if you survive the term. Because of the complexity and the need to time them well, GRATs are usually used by people with estates over $10 million and with professional tax and legal guidance.

Charitable remainder trusts and donor-advised funds

If you want to reduce estate tax and support charity, a charitable remainder trust (CRT) can do both. You fund the trust with appreciated assets, receive an income stream for life or a set term, and the remainder goes to charity. You get an when ready income tax deduction for the present value of the charitable gift, and the assets are removed from your taxable estate.

A donor-advised fund (DAF) is simpler and more flexible. You contribute appreciated assets or cash to the fund, receive an when ready tax deduction, and then recommend grants to charities over time. The fund is irrevocable — you cannot get the money back — but you have flexibility in when and where the money goes. DAFs have lower setup costs than CRTs and no annual tax filings.

Both strategies work best if you are charitably inclined and have appreciated assets you were planning to sell anyway. The income tax deduction can be substantial, and removing assets from your estate reduces estate tax. The trade-off is that the money goes to charity, not to your heirs. These strategies are most useful when combined with other planning — for example, using a GRAT or ILIT to pass other assets to family, and a CRT or DAF for the assets you want to give away.

State estate tax and why it matters more than federal tax

Seventeen states and Washington, D.C. have their own estate taxes, and most have exemptions far below the federal level. New York's exemption is $6.94 million (2024); Massachusetts has $1 million; Oregon has $1 million. If you live in one of these states or own real estate there, state estate tax can explore even if federal tax does not.

A trust does not automatically avoid state tax, but it can be structured to do so. For example, if you move to a state with no estate tax before you die, your estate may avoid that state's tax. If you own real estate in a high-tax state, a trust can hold the property in a way that minimizes state exposure. Some people use a trust to split assets between spouses in states with lower exemptions, similar to a bypass trust strategy.

State tax planning is highly specific to where you live and where you own property. If you are in a state with an estate tax and your estate is close to the threshold, a trust strategy can save tens of thousands of dollars. This is where a local tax attorney or estate planner becomes essential — they know the rules in your state and can structure a trust that actually saves money.

When a trust does not save estate tax

If your estate is well below the federal exemption, a trust will not reduce federal estate tax. In 2024, the exemption is $13.61 million per person; for a married couple, it is $27.22 million. If your estate is $5 million, you have no federal estate tax exposure, and a trust does not change that. A straightforward will or revocable living trust (which avoids probate) may be all you need.

Trusts also do not save tax if they are not properly funded. A trust is just a document until you transfer assets into it. If you create an irrevocable trust but never fund it, or if you fund it but keep control over the assets, the IRS may disregard the trust structure and tax the assets in your estate anyway. Funding requires changing titles, deeds, and account registrations — it is not automatic.

Finally, trusts do not save tax if you change your mind. An irrevocable trust cannot be undone. If you set up an ILIT or GRAT and later want the assets back, you cannot get them without triggering gift or income tax. This is why these strategies require careful planning and certainty about your long-term goals. If you are unsure, a revocable living trust (which can be changed) may be a better starting point.

Working with an attorney and tax professional

Trust-based estate tax planning requires coordination between your attorney (who drafts the trust), your tax professional (who advises on the tax impact), and your financial advisor (who helps fund and manage it). Each plays a different role, and they need to communicate.

An attorney drafts the trust document and ensures it complies with your state's law. They also advise on funding — which assets should go into the trust, how to retitle them, and what documents are needed. A tax professional calculates the gift tax impact, advises on whether the strategy makes sense for your situation, and handles the tax filings (Form 709 for gifts, Form 1041 for trust income, Form 3520 for certain trust transactions). Your financial advisor helps you understand the ongoing costs and whether the assets in the trust are invested appropriately.

The cost of setting up a trust varies. A straightforward revocable living trust might cost $1,000 to $3,000. An ILIT or GRAT can cost $2,000 to $5,000 or more, depending on complexity. A bypass trust built into a comprehensive estate plan might cost $3,000 to $10,000. These are one-time costs, though some trusts require annual tax filings (which cost $500 to $2,000 per year). For estates large enough to benefit from these strategies, the tax savings usually far exceed the cost.

Frequently Asked Questions

Can I use a trust to avoid estate tax if I am not married?

Yes, but the strategies are different. An ILIT works for anyone and removes life insurance from your taxable estate. A GRAT can shift growth to heirs. A bypass trust is designed for married couples, but a single person can use a similar structure called a "credit shelter trust" to shelter assets for heirs. The federal exemption still applies — you get $13.61 million (in 2024) whether you are married or single.

What happens to my trust if I die before the term ends?

It depends on the type of trust. If you die during a GRAT term, the assets come back into your taxable estate, so the strategy does not work. If you die while an ILIT is in force, the death benefit goes to the trust as planned, which is the whole point. A bypass trust is created at your death, so timing is not an issue. Always discuss life expectancy and term length with your attorney before setting up a time-limited trust.

Can I change my mind about an irrevocable trust?

Not easily. An irrevocable trust cannot be amended or revoked by you once it is signed. In some cases, a trustee can petition a court to modify the trust if circumstances have changed dramatically, but this is expensive and not may provide. If you are unsure about your long-term plans, start with a revocable living trust instead, which you can change anytime.

Do I need a trust if my estate is small?

Probably not for tax reasons. If your estate is under the federal exemption and your state has no estate tax, a trust will not save you estate tax. You may still want a revocable living trust to avoid probate, but that is a different benefit. Talk to an attorney about whether probate avoidance is worth the cost in your situation.

What is the difference between a revocable and irrevocable trust?

A revocable trust can be changed or canceled by you during your lifetime. It does not reduce estate tax but does avoid probate. An irrevocable trust cannot be changed once signed, and it removes assets from your taxable estate, which can reduce tax. The trade-off is control: you keep control with a revocable trust but lose it with an irrevocable one. Most people use a revocable trust as their main estate plan and add irrevocable trusts (like an ILIT) for specific tax goals.