Yes, you generally pay taxes on a trust fund, but who actually writes the check depends on the trust’s structure and where the money sits at year-end. Income from a revocable trust is taxed to the grantor on their personal return. Income from an irrevocable trust is taxed either to the trust itself (at brackets that reach 37% above just $16,000 of taxable income in 2026) or to the beneficiaries who receive it. The original assets placed into a trust, called principal, typically aren’t taxed again when they’re paid out, because tax was already paid before the transfer.
Revocable Trusts: The Grantor Pays
A revocable trust is one the grantor can change or dissolve at will. Because the grantor never truly gave up control, federal tax law treats the trust as if it doesn’t exist as a separate entity. Under IRC Section 676, a grantor who retains the power to take back trust assets is treated as the owner of those assets for income tax purposes.1Office of the Law Revision Counsel. 26 U.S. Code 676 – Power to Revoke Every dollar of interest, dividends, rental income, and capital gains generated inside the trust gets reported on the grantor’s individual Form 1040.
There’s no separate Employer Identification Number needed while the grantor is alive. The grantor uses their own Social Security number on trust accounts and tax filings.2Internal Revenue Service. Understanding Your EIN From a filing standpoint, a revocable trust adds nothing new.
That changes when the grantor dies. The trust typically becomes irrevocable, needs its own EIN, and starts filing its own return.
Irrevocable Trusts: The Trust Pays on Retained Income
An irrevocable trust is a separate taxpayer. Once a grantor permanently transfers assets in, those assets belong to the trust. The trustee must obtain an EIN and file Form 1041 each year to report income, deductions, gains, and losses.3Internal Revenue Service. About Form 1041, U.S. Income Tax Return for Estates and Trusts
What surprises most people is how quickly the brackets climb. For 2026, trust income is taxed at:
- 10% on taxable income up to $3,300
- 24% on income from $3,301 to $11,700
- 35% on income from $11,701 to $16,000
- 37% on income above $16,000
An individual married filing jointly doesn’t reach 37% until taxable income exceeds roughly $626,350. A trust hits it at $16,000.4Internal Revenue Service. Rev. Proc. 2025-32 – 2026 Inflation Adjustments This compression is the single biggest reason trustees push income out to beneficiaries rather than let it accumulate.
The 3.8% Net Investment Income Tax
On top of ordinary income tax, trusts owe a 3.8% surtax on net investment income, which covers interest, dividends, capital gains, rental income, and royalties. The tax applies to the lesser of undistributed net investment income or the amount by which adjusted gross income exceeds the threshold where the top ordinary bracket begins.5Office of the Law Revision Counsel. 26 U.S. Code 1411 – Imposition of Tax For 2026, that threshold is again $16,000.4Internal Revenue Service. Rev. Proc. 2025-32 – 2026 Inflation Adjustments
The effective top rate on undistributed trust investment income comes to 40.8%. An individual doesn’t face the NIIT until modified adjusted gross income exceeds $200,000 (single) or $250,000 (married filing jointly). The gap between the two is the whole reason trust distribution planning exists.
Beneficiaries: Tax on Distributed Income, Not Principal
When a beneficiary receives money from a trust, the tax treatment depends on what the money represents. Distributions of principal are generally not taxable, because those assets were already taxed before entering the trust. The taxable event is a distribution of the trust’s current-year income.
The trustee reports each beneficiary’s share of taxable income on Schedule K-1 (Form 1041), which the beneficiary carries onto their personal return. The amount the trust can push through to beneficiaries is capped by Distributable Net Income, or DNI. DNI prevents double taxation: the trust deducts what it distributes, the beneficiary reports the same amount on their K-1, and no dollar gets taxed twice.6Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1
For a beneficiary receiving a distribution, this is the practical takeaway: expect a K-1 in the mail, and expect to owe tax at your own individual rate on whatever income portion the trust passes through. If the check is entirely principal, it doesn’t hit your return.
The 65-Day Rule
Trustees who realize at year-end that too much taxable income has piled up inside the trust have a narrow escape hatch. Under IRC Section 663(b), a trustee can elect to treat distributions made in the first 65 days of a new tax year as if they were made on the last day of the prior year. For a calendar-year trust, that covers distributions through March 6 (or March 7 in a leap year).
The election is not automatic. The trustee must check the box on the prior year’s Form 1041, and once made, the choice is irrevocable for that year. If December closes with $50,000 sitting in the trust and taxed at 37%, a January distribution can shift the tax to the beneficiary’s lower rate while giving the trust the prior-year deduction.
Gift and Estate Tax When Funding a Trust
Moving assets into an irrevocable trust is a gift for federal tax purposes. If the value transferred to any single person exceeds the annual gift tax exclusion, $19,000 per recipient in 2026, the excess counts against the grantor’s lifetime exemption.7Internal Revenue Service. What’s New — Estate and Gift Tax The grantor files Form 709 for the year of the transfer to document the gift.8Internal Revenue Service. Instructions for Form 709 (2025)
The lifetime exemption for 2026 is $15,000,000 per individual, following the enactment of the One Big Beautiful Bill (Public Law 119-21).9Office of the Law Revision Counsel. 26 U.S. Code 2010 – Unified Credit Against Estate Tax Married couples can effectively shelter up to $30,000,000 combined through portability, where the surviving spouse claims the deceased spouse’s unused exemption. Transfers at death are reported on Form 706.10Internal Revenue Service. About Form 706, United States Estate (and Generation-Skipping Transfer) Tax Return
Understating the value of transferred assets can trigger accuracy-related penalties of 20% of the resulting tax underpayment, rising to 40% for a gross valuation misstatement.11Internal Revenue Service. 20.1.5 Return Related Penalties Professional appraisals are typically needed for real estate, closely held business interests, and other hard-to-value property.
State Estate and Inheritance Taxes
Federal rules aren’t the whole picture. Roughly a dozen states and the District of Columbia impose their own estate taxes, and a handful of states levy inheritance taxes on beneficiaries. State exemption thresholds are often far lower than the federal figure, sometimes starting at $1,000,000. In states that tax inheritances, the rate and exemption typically depend on the beneficiary’s relationship to the deceased, with spouses and children treated most favorably. A trust that owes nothing federally can still generate a real state tax bill, so check your state’s rules before assuming the federal exemption is the end of the analysis.
Foreign Trusts Carry Separate Reporting
If the trust is foreign, additional filings apply, and the penalties for missing them are severe. U.S. persons who create, transfer assets to, or receive distributions from a foreign trust must file Form 3520, due with the filer’s income tax return including extensions.12Internal Revenue Service. Instructions for Form 3520
Failure to file on time, or filing with incomplete information, triggers an initial penalty equal to the greater of $10,000 or 35% of the gross reportable amount. If the failure continues more than 90 days after the IRS sends notice, an additional $10,000 penalty accrues for each 30-day period the filing remains outstanding.13Office of the Law Revision Counsel. 26 U.S. Code 6677 – Failure to File Information With Respect to Certain Foreign Trusts Reasonable-cause waivers exist but are applied strictly.
Filing Deadlines and Estimated Payments
Form 1041 is due by the 15th day of the fourth month after the trust’s tax year ends. For calendar-year trusts, that means April 15.14Internal Revenue Service. Forms 1041 and 1041-A: When to File Schedule K-1s must go out by the same date so beneficiaries can complete their own returns. Filing Form 7004 before the original due date grants an automatic five-and-a-half-month extension, pushing the deadline to September 30 for calendar-year trusts.15Internal Revenue Service. Instructions for Form 7004 The extension covers paperwork only. Any tax owed is still due in April.
Trusts expecting to owe $1,000 or more for the year, after withholding and credits, generally must make quarterly estimated payments on Form 1041-ES. For calendar-year trusts in 2026, those payments are due April 15, June 15, September 15, and January 15 of the following year.16Internal Revenue Service. 2026 Form 1041-ES Estimated Income Tax for Estates and Trusts The January payment can be skipped if the trustee files the annual Form 1041 and pays the full balance by January 31. If the trust holds income-producing assets and doesn’t distribute everything, it needs to be making these quarterly payments the same way a self-employed individual would.