When the grantor of a revocable living trust dies, the trust becomes an irrevocable, separate taxpayer, and the decedent’s trust tax rules split cleanly into two tracks: income tax on anything the trust earns from the date of death forward, reported on IRS Form 1041, and potentially federal estate tax on Form 706 if the total estate exceeds $15 million in 2026. Form 1041 uses a sharply compressed rate schedule that hits the top 37% bracket at just $16,000 of taxable income, which is why nearly every tax decision the successor trustee makes revolves around whether to hold income inside the trust or push it out to beneficiaries.
What Changes the Moment the Grantor Dies
During the grantor’s lifetime, a revocable living trust was invisible for tax purposes. Income flowed through to the grantor’s personal 1040, and the trust used the grantor’s Social Security number. Death ends that arrangement. The trust locks into an irrevocable structure, its assets separate permanently from the decedent’s personal finances, and it becomes its own taxpayer going forward.
The successor trustee named in the trust document takes over immediately and owes fiduciary duties to the beneficiaries. First priorities are securing trust assets, notifying financial institutions of the change in authority, and re-titling accounts held in the decedent’s individual name into the trust under the new trustee. Assets already titled in the trust stay put. If the decedent had a pour-over will directing personal assets into the trust, those assets must clear probate before they join it.
Getting the Trust a New Tax ID
The first administrative task is obtaining an Employer Identification Number for the trust by filing Form SS-4 with the IRS online, by fax, or by mail.1Internal Revenue Service. About Form SS-4 The new EIN is required before the trustee can open bank accounts, receive investment income, or file the trust’s return.
The trustee should also file Form 56 to formally notify the IRS of the fiduciary relationship and establish that the trustee is now the responsible party for the trust’s tax matters.2Internal Revenue Service. About Form 56, Notice Concerning Fiduciary Relationship Separate bank accounts under the new EIN hold all post-death income — rent, dividends, interest — and all administrative expenses flow out of them. Commingling trust money with personal money is one of the quickest paths to personal liability.
Stepped-Up Basis and What Doesn’t Get It
Federal law resets the cost basis of assets acquired from a decedent to fair market value as of the date of death.3Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent This applies to property held in a revocable trust where the grantor retained the right to revoke or amend during life. Stock bought decades ago for $10,000 and worth $200,000 at death takes a new basis of $200,000. Sold the next day for $200,000, the taxable gain is zero. Establishing fair market value for every trust asset as of the date of death is essential because those valuations become the starting point for every future capital gains calculation.
Not everything steps up. Items classified as income in respect of a decedent keep the decedent’s original tax characteristics. The most common examples are traditional IRA and 401(k) balances, unpaid wages, and deferred compensation. When those assets are eventually distributed, the recipient pays ordinary income tax on the full amount, just as the decedent would have.4Office of the Law Revision Counsel. 26 USC 691 – Recipients of Income in Respect of Decedents Identifying and segregating IRD items early prevents reporting mistakes later.
How Trust Income Is Taxed on Form 1041
Any income the trust earns after the grantor’s death goes on Form 1041, U.S. Income Tax Return for Estates and Trusts. A trust must file if it has any taxable income for the year, has gross income of $600 or more, or has a nonresident alien beneficiary.5Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 Form 1041 is entirely separate from the decedent’s final personal return on Form 1040, which still has to be filed by the surviving spouse or personal representative to cover the period from January 1 through the date of death.6Internal Revenue Service. How to File a Final Tax Return for Someone Who Has Passed Away
The Compressed Brackets
Trusts and estates pay income tax on an unforgiving rate schedule. For 2026:7Internal Revenue Service. 2026 Form 1041-ES
- 10% on taxable income up to $3,300
- 24% from $3,301 to $11,700
- 35% from $11,701 to $16,000
- 37% on anything over $16,000
An individual taxpayer doesn’t hit 37% until well over $600,000 of taxable income. A trust gets there at $16,000. The 3.8% net investment income tax also applies to trusts once adjusted gross income exceeds the threshold where the 37% bracket starts, which for 2026 is $16,000.8Internal Revenue Service. Topic No. 559, Net Investment Income Tax Undistributed investment income can face a combined federal rate above 40%.
Distributable Net Income and the K-1
The mechanism that decides whether the trust or the beneficiary pays the tax is distributable net income, essentially the trust’s net income available to pass through. When the trustee distributes income to beneficiaries, the trust claims a corresponding deduction on Form 1041, and the tax liability shifts to the beneficiaries, who report their share on their personal returns and usually pay at a lower rate because individual brackets are so much wider.9Office of the Law Revision Counsel. 26 USC 643 – Definitions Applicable to Subparts A, B, C, and D
The trustee reports each beneficiary’s share on Schedule K-1 (Form 1041), which must be provided to the beneficiary by the Form 1041 due date.5Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 The K-1 breaks income down by type — interest, dividends, capital gains, rental income — so each category keeps its character on the beneficiary’s return.10Internal Revenue Service. Instructions for Schedule K-1 (Form 1041) for a Beneficiary Filing Form 1040 or 1040-SR
Simple Trusts, Complex Trusts, and Capital Gains
A simple trust must distribute all income every year and cannot distribute principal or make charitable gifts. Because the income leaves, the beneficiaries usually pay the tax. A complex trust can accumulate income, distribute principal, or give to charity. Any income it keeps gets taxed at the compressed trust rates. Most irrevocable trusts formed from a formerly revocable living trust end up as complex trusts because they have discretion over distributions.
Capital gains from selling appreciated trust assets are generally treated as part of principal under fiduciary accounting rules, not income. They typically stay at the trust level and get taxed there rather than passing through on DNI. The main exceptions are when the trust document specifically allocates gains to income, when gains go out with principal, or when they arise during the trust’s final year, at which point remaining gains flow to the beneficiaries on their K-1s.9Office of the Law Revision Counsel. 26 USC 643 – Definitions Applicable to Subparts A, B, C, and D
Two Elections That Can Cut the Bill
Section 645 Election
If the decedent also had a probate estate, the trustee and executor can jointly elect under Section 645 to treat the revocable trust as part of the estate for income tax purposes.11Office of the Law Revision Counsel. 26 USC 645 – Certain Revocable Trusts Treated as Part of Estate Estates can choose a fiscal year, potentially deferring income into a later period and giving beneficiaries more time before their first K-1 income lands.
The election runs until the earlier of the date all assets are distributed or the “applicable date.” Where no Form 706 is required, the applicable date is two years after death. Where Form 706 is required, it is the later of two years after death or six months after the estate tax liability is finally determined.12eCFR. 26 CFR 1.645-1 – Election by Certain Revocable Trusts to Be Treated as Part of Estate It must be made by the due date (with extensions) of the estate’s first income tax return, and once made it cannot be revoked.
The 65-Day Rule
Under Section 663(b), a trustee can elect to treat distributions made within the first 65 days after the close of the tax year as if they were made on the last day of the prior tax year.13eCFR. 26 CFR 1.663(b)-1 – Distributions in First 65 Days of Taxable Year That gives the trustee until early March to look at the prior year’s trust income and push it out to beneficiaries retroactively, keeping it out of the 37% bracket. The election applies only to the year made and cannot exceed the trust’s DNI for that year.
Federal Estate Tax and Form 706
If the decedent’s total taxable estate exceeds the federal estate tax exemption, the estate owes a separate tax of up to 40% on the excess. For 2026, the exemption is $15 million per person following enactment of the One Big Beautiful Bill Act, signed into law July 4, 2025, which replaced the expiring TCJA provisions with no sunset date and inflation adjustments starting in 2027.14Internal Revenue Service. What’s New – Estate and Gift Tax
When required, Form 706 is due nine months after the date of death. The executor can request an automatic six-month extension by filing Form 4768 before the original deadline, though the estimated tax must still be paid on time.15Internal Revenue Service. Filing Estate and Gift Tax Returns16Internal Revenue Service. About Form 4768, Application for Extension of Time to File a Return and/or Pay US Estate (and Generation-Skipping Transfer) Taxes
One point trips up families: assets in a revocable living trust are included in the decedent’s gross estate for estate tax purposes even though they avoid probate. A revocable trust avoids the probate process, not the estate tax. Every dollar in the trust counts toward the $15 million threshold.
Portability for a Surviving Spouse
Married couples effectively have a combined $30 million exemption because the surviving spouse can claim the deceased spouse’s unused exclusion amount. Portability is not automatic. The executor must file a complete Form 706 to elect it, even if the estate is well below the filing threshold and owes zero tax.17Internal Revenue Service. Instructions for Form 706 Missing the filing means the unused exemption is lost. For estates that miss the nine-month deadline, the IRS allows a late portability election up to five years after the date of death under simplified procedures.
Deductions the Trust Can Take
Form 1041 lets the trust reduce taxable income before the compressed brackets bite. Administrative expenses tied to managing trust assets or producing income are deductible, including legal fees for trust administration, accounting fees for preparing the return, and trustee compensation. State and local income taxes paid by the trust during the year are also deductible.
Where the estate is large enough to require Form 706, the trustee faces a choice: administrative expenses can be deducted on Form 1041 to reduce income tax, or on Form 706 to reduce estate tax, but not both.18Internal Revenue Service. How Do I Deduct the Administration Expenses of My Father’s Estate? Which return produces the greater savings usually takes running the numbers both ways.
Filing Deadlines and Penalties
Form 1041 is due by the 15th day of the fourth month after the close of the trust’s tax year. For a calendar-year trust, that is April 15 of the following year.19Internal Revenue Service. Forms 1041 and 1041-A: When to File The trustee can extend the return, but any tax owed must still be paid by the original due date to avoid interest.
Trusts expecting to owe $1,000 or more for the year must make quarterly estimated payments using Form 1041-ES. Missing them triggers underpayment penalties on top of the already-high trust rates.20Internal Revenue Service. About Form 1041-ES, Estimated Income Tax for Estates and Trusts
Late filing of Form 1041 carries a penalty of 5% of the unpaid tax for each month or partial month the return is late, up to 25%. If the return is more than 60 days overdue, the minimum penalty is the lesser of $525 or the total tax due. The IRS will waive the penalty for reasonable cause.
Distributing Assets and Closing the Trust
Once debts are settled, taxes paid, and administrative tasks finished, the trustee distributes what remains to the beneficiaries named in the trust document. Each asset type has its own transfer process. Real estate needs a new deed, typically a trustee’s deed, prepared and recorded in the county where the property sits. Financial accounts need transfer paperwork with each institution to re-title the assets into the beneficiary’s name. Before final distributions go out, the trustee should give beneficiaries a full accounting of every dollar of income received, expenses paid, and distributions made during administration.
The trust’s legal existence ends with the filing of the final Form 1041, marked “Final Return.” Any remaining income, deductions, and unused tax attributes flow out to the beneficiaries on their last K-1s. The trust is not legally terminated until every asset has been distributed and that final return is filed.