Trust taxation confuses almost everyone, including many financial advisors. But the core rules are straightforward once you separate revocable trusts from irrevocable trusts.
Revocable Trust Taxation: Nothing Changes
A revocable living trust is invisible to the IRS during the grantor's lifetime. You do not file a separate tax return for it. You do not get a separate tax ID number. All income earned by trust assets is reported on your personal Form 1040, exactly as if the trust did not exist.
Why? Because you maintain full control over the trust. The IRS does not tax entities where the grantor retains control -- it taxes the person who controls the assets.
When the grantor dies, the revocable trust becomes irrevocable. At that point, it needs its own tax ID number (EIN) and may need to file its own tax return.
Irrevocable Trust Taxation: The Compressed Bracket Problem
Irrevocable trusts are separate tax entities. They file Form 1041 (U.S. Income Tax Return for Estates and Trusts) and pay taxes on income they retain. Here is where the problem starts.
Trust tax brackets are extremely compressed. In 2026, the brackets look approximately like this:
- 10% on the first $3,150 of income
- 24% on income between $3,150 and $11,450
- 35% on income between $11,450 and $15,650
- 37% on income over $15,650
Compare that to individual brackets, where the 37% rate does not kick in until about $609,000 of income. A trust hits the top rate at just $15,650. Congress designed it this way to discourage people from shifting income to trusts to avoid taxes.
The solution: distribute income to beneficiaries. When a trust distributes income, the trust gets a deduction and the beneficiary reports the income on their personal return (at their presumably lower tax rate). This pass-through mechanism is the foundation of irrevocable trust tax planning.
The Distribution Deduction
Form 1041 includes a "distribution deduction" that reduces the trust's taxable income by the amount distributed (or required to be distributed) to beneficiaries. The beneficiaries then receive a Schedule K-1 showing their share of trust income, which they report on their personal returns.
Example: An irrevocable trust earns $50,000 in income. If the trust keeps all $50,000, it pays approximately $16,250 in federal income tax (hitting the top bracket quickly). If instead the trust distributes $50,000 to two beneficiaries ($25,000 each), and each beneficiary is in the 22% bracket, the total tax is about $11,000. The family saves $5,250 by distributing instead of retaining.
Distributable Net Income (DNI)
DNI is the maximum amount of a distribution that is taxable to the beneficiary. It is essentially the trust's taxable income, with some adjustments. The trust cannot distribute more taxable income than it has. If the trust earns $30,000 but distributes $50,000, only $30,000 is taxable to the beneficiary. The remaining $20,000 is a non-taxable distribution of trust principal.
The 65-Day Rule
Trustees have a special option: they can make distributions within 65 days after the end of the tax year and elect to treat them as if they were made in the prior year. This gives trustees time to review the trust's actual income for the year and make tax-efficient distribution decisions after the fact. The election is made on the trust's tax return (Form 1041).
Grantor Trust Rules
Some irrevocable trusts are "grantor trusts" for income tax purposes. This means the IRS ignores the trust and taxes all income to the grantor personally, even though the grantor does not own or control the assets. This sounds bad, but for estate planning purposes it is often desirable.
Why? Because the grantor paying the income tax is essentially making a tax-free gift to the trust. The payment reduces the grantor's estate without counting as a gift for gift tax purposes. Meanwhile, the trust assets grow without being diminished by income taxes.
Intentionally defective grantor trusts (IDGTs) are a common estate planning technique that takes advantage of this quirk. The trust is "defective" for income tax (the grantor pays the tax) but effective for estate tax (the assets are out of the grantor's estate).
Capital Gains in Trusts
Capital gains in trusts are usually allocated to principal, not income. This means they are generally not included in DNI and do not pass through to beneficiaries on the K-1. The trust pays capital gains tax at its own compressed rates.
Exception: In the year a trust terminates, capital gains can be allocated to beneficiaries. Also, if the trust document specifically allocates gains to income, or if the trustee has discretion to do so, gains can be passed through.
State Income Taxes on Trusts
States tax trusts based on various factors:
- Where the trust was created
- Where the trustee is located
- Where the beneficiaries live
- Where the grantor lived when the trust became irrevocable
States with no income tax (Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, Wyoming) do not tax trust income. This makes them attractive locations for irrevocable trust situs.
Some states (California and New York, for example) tax trusts based on the beneficiary's residence, regardless of where the trust is located. Tax planning around state trust taxes requires careful analysis of your specific situation.
The Net Investment Income Tax (NIIT)
Trusts with undistributed net investment income above $15,200 (in 2026) pay an additional 3.8% tax on top of regular income tax. This applies to interest, dividends, capital gains, rents, and royalties. Distributing investment income to beneficiaries who are below the NIIT threshold ($200,000 for individuals) is another reason to prefer distributions over retention.
Our platform does not prepare tax returns, but it generates trust documents with tax-efficient provisions. The trust wizard asks about your tax situation and recommends trust structures that minimize the tax burden. For trusts with significant income, we recommend working with a CPA who specializes in trust taxation.