Revocable trusts are taxed at death in three distinct ways: the trust’s assets are included in the grantor’s gross estate and may owe federal estate tax if the total estate exceeds $15 million in 2026, the trust itself becomes a separate income taxpayer on earnings it produces after the grantor dies, and beneficiaries who inherit trust property generally take it with a stepped-up cost basis that reduces capital gains tax when they later sell.
Why Trust Assets Stay in the Taxable Estate
A revocable trust does not shrink the estate. Because the grantor kept the right to alter, amend, or cancel the trust at any time while alive, federal tax law treats everything inside it as still owned by the grantor at death.1Office of the Law Revision Counsel. 26 U.S.C. 2038 – Revocable Transfers A companion provision pulls in any property where the grantor retained the right to use it or receive its income.2Office of the Law Revision Counsel. 26 U.S.C. 2036 – Transfers With Retained Life Estate
The practical effect: every asset titled to the trust — real estate, brokerage accounts, business interests — counts toward the estate’s total value for federal estate tax purposes. Funding a revocable trust during life is a probate-avoidance and management tool, not an estate-tax reduction tool.
The 2026 Federal Estate Tax Threshold
Federal estate tax kicks in only when the gross estate exceeds the basic exclusion amount. For deaths in 2026, that threshold is $15 million per individual, or effectively $30 million for a married couple who uses portability.3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 The higher exemption originally set by the Tax Cuts and Jobs Act was made permanent by later legislation rather than reverting to roughly half that amount.
Estates above the exemption face a graduated rate that reaches 40 percent on taxable estate amounts over $1 million after the exemption is applied.4Office of the Law Revision Counsel. 26 U.S.C. 2001 – Imposition and Rate of Tax Valuation is based on fair market value at the date of death across all assets, inside and outside the trust. For hard-to-value property — closely held businesses, real estate, collectibles — a professional appraisal protects against underreporting.
If asset values fall sharply in the six months after death, the executor can elect to value the estate as of that later date, but only if doing so reduces both the gross estate and the total transfer taxes owed. The election is irrevocable once made.5Office of the Law Revision Counsel. 26 U.S.C. 2032 – Alternate Valuation
Portability for a Surviving Spouse
When the first spouse dies without using the full $15 million exemption, the leftover amount — the deceased spousal unused exclusion, or DSUE — can transfer to the surviving spouse. Claiming it requires the executor to file a complete Form 706 federal estate tax return, even when the estate is far below the filing threshold.6Internal Revenue Service. Instructions for Form 706
The surviving spouse’s own exemption is applied first to any future taxable gifts, then the DSUE. Only the DSUE from the most recently deceased spouse counts, so remarriage followed by the new spouse’s death can wipe out a DSUE inherited from a prior spouse.
Executors who miss the original deadline for the portability election may still file Form 706 up to five years after the date of death under a special IRS procedure, so long as no estate tax return was otherwise required. The return must state at the top that it is filed under that procedure.7Internal Revenue Service. Revenue Procedure 2022-32 Miss that window and the unused exemption is lost for good.
Stepped-Up Basis for Beneficiaries
This is where inheriting trust assets often produces a large tax break. The cost basis of each asset resets to its fair market value on the date of death, erasing any built-up gain from the grantor’s lifetime.8Office of the Law Revision Counsel. 26 U.S.C. 1014 – Basis of Property Acquired From a Decedent
Say the grantor bought stock for $10,000 and it was worth $50,000 at death. The new basis is $50,000. A beneficiary who sells it later for $55,000 has only a $5,000 capital gain, not $45,000. The same rule applies to real estate, mutual funds, and other capital assets held in the trust.
The step works in both directions. If the asset lost value, the basis steps down to the lower date-of-death value, and beneficiaries cannot claim a loss based on what the grantor originally paid. When the executor elects the alternate valuation date, basis reflects the value at that later date instead.
Income Tax on the Trust After Death
While the grantor was alive, the trust was invisible for income tax and everything ran through the grantor’s personal return. That ends at death. The trust becomes its own taxpayer with its own tax identification number and its own return.
Interest, dividends, rent, and other income the trust earns after the date of death go on Form 1041. If the successor trustee distributes that income to beneficiaries, the trust deducts what it passed out, and the beneficiaries pick it up on their personal returns instead. That prevents the same dollar from being taxed at both the trust and beneficiary level.9Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 (2025)
Compressed Trust Tax Brackets
Income kept inside the trust is taxed on a schedule that reaches the top rate far faster than an individual’s. For 2026, trusts and estates hit the 37 percent bracket once taxable income exceeds $16,000.3Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 The full 2026 schedule for trusts and estates:
- 10 percent on income up to $3,300
- 24 percent on income from $3,301 to $11,700
- 35 percent on income from $11,701 to $16,000
- 37 percent on income over $16,000
An individual taxpayer does not reach 37 percent until income far exceeds those amounts. Undistributed net investment income in the trust may also owe the 3.8 percent Net Investment Income Tax on top, pushing the effective rate above 40 percent. Trustees who have discretion to distribute typically do so, because the same income taxed on a beneficiary’s return usually pays less.
Calendar Year and the Section 645 Election
Trusts must use a calendar year for tax reporting.10Office of the Law Revision Counsel. 26 U.S. Code 644 – Taxable Year of Trusts Estates can choose a fiscal year, which is why one election is worth knowing about: the executor and trustee can jointly elect to treat the revocable trust as part of the estate for income tax purposes.11Office of the Law Revision Counsel. 26 U.S.C. 645 – Certain Revocable Trusts Treated as Part of Estate Both must agree, and Form 8855 must be filed by the due date (including extensions) of the estate’s first income tax return.12Internal Revenue Service. About Form 8855, Election to Treat a Qualified Revocable Trust as Part of an Estate
The election lets the combined entity use a fiscal year, which can defer tax, and consolidates two returns into one. It runs until two years after death if no estate tax return is required, or six months after estate tax liability is finalized if a return is required. Once made, it cannot be revoked.
State Estate and Inheritance Taxes
Federal exemption is not the whole picture. Roughly a dozen states and the District of Columbia impose their own estate tax, and several states impose an inheritance tax paid by the beneficiary rather than the estate. A few states impose both. State estate tax exemptions are often much lower than the federal threshold, ranging from about $1 million to roughly $7 million depending on the state. A revocable trust does not shield assets from any of these.
Inheritance tax rates typically depend on the beneficiary’s relationship to the deceased. Spouses are usually exempt, children and close relatives pay lower rates, and unrelated beneficiaries face the highest. Trustees should check the rules of any state where the decedent lived or owned real property, because either can trigger a filing obligation even when no federal tax is owed.
What the Successor Trustee Has to File
The person stepping in as trustee inherits a set of tax deadlines. Missing them costs money.
New Employer Identification Number
The trust cannot keep using the grantor’s Social Security number. The trustee applies for a new EIN with Form SS-4; the online application issues the number immediately.13Internal Revenue Service. Employer Identification Number
Form 1041, the Trust’s Income Tax Return
If the trust has $600 or more in gross income during a tax year, or any taxable income, the trustee must file Form 1041.9Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 (2025) Because trusts use a calendar year, the return is generally due April 15 of the following year.14Internal Revenue Service. Forms 1041 and 1041-A – When to File The trustee also sends each beneficiary a Schedule K-1 showing their share of distributed income.
Form 706, the Federal Estate Tax Return
If the gross estate exceeds the $15 million threshold for 2026, Form 706 is due within nine months of the date of death. Form 4768 filed before that deadline buys an automatic six-month extension.15Internal Revenue Service. Instructions for Form 706 Estates below the threshold should still consider filing 706 to elect portability for a surviving spouse.
The Grantor’s Final Form 1040
Someone — usually the surviving spouse, executor, or personal representative — files a final personal income tax return for the deceased covering January 1 through the date of death. It’s due by the normal April deadline of the following year.16Internal Revenue Service. Filing a Final Federal Tax Return for Someone Who Has Died The final 1040 is separate from the trust’s 1041, which covers only income earned after death.
Penalties for Late Filing and Undervaluation
The late-filing penalty on Form 1041 is 5 percent of unpaid tax for each month or partial month the return is late, capped at 25 percent. If the return is more than 60 days late, the minimum penalty is the lesser of $525 or the full tax due.17Internal Revenue Service. 2025 Instructions for Form 1041 and Schedules A, B, G, J, and K-1 Interest runs on unpaid tax from the original due date even when an extension to file was granted.
Undervaluation on the estate tax return has its own penalty. If the reported value of an asset is 65 percent or less of the correct value and the resulting underpayment exceeds $5,000, the IRS can impose a 20 percent accuracy-related penalty on the underpaid amount. The penalty doubles to 40 percent if the reported value is 40 percent or less of the correct amount.18Office of the Law Revision Counsel. 26 U.S.C. 6662 – Imposition of Accuracy-Related Penalty on Underpayments Qualified appraisals on real estate, closely held business interests, and other hard-to-value assets are the standard defense.