What Happens to a Revocable Trust When the Grantor Dies

The short version: the trust becomes irrevocable the moment the grantor dies, the successor trustee steps in automatically, and the trust becomes a new taxpayer. Everything else — asset transfers, beneficiary notifications, tax filings — flows from those three facts. This guide explains each of them in plain language and tells you what to do in the first days, weeks, and months.

Are you in this situation right now? If a parent or spouse just died and you are named as successor trustee, this guide explains what happened legally and what you must do. The most time-sensitive actions are the S-corp election window (2 months 16 days — see below) and the § 645 election deadline. Most other tasks have more time, but some cannot be reversed if delayed.

1. The trust becomes irrevocable immediately

During the grantor's lifetime, a revocable living trust is — as the name says — revocable. The grantor can amend it, revoke it, or change beneficiaries at any time. The grantor typically serves as the initial trustee and treats the trust assets as their own for legal and tax purposes.

The moment the grantor dies, three things happen simultaneously under the trust document and applicable law (Uniform Trust Code § 602(a)):¹

The power to revoke or amend is gone forever. The trust terms are now fixed. The successor trustee must follow the trust document as written — they have no authority to change it.
The successor trustee steps in. The trust document names a successor trustee (typically an adult child) who automatically assumes fiduciary authority. No court order or probate proceeding is required.
The trust becomes a separate legal and tax entity. The grantor's Social Security Number can no longer be used for trust assets. The trust needs its own Employer Identification Number (EIN) and will file its own federal income tax return (Form 1041) going forward.

There is no waiting period, no court process, and no "probate for trusts." This is precisely why revocable trusts were created — to allow assets to pass quickly and privately without probate.

2. The successor trustee accepts the role

Under UTC § 701, a named successor trustee accepts the role by signing an acceptance document or by beginning to act as trustee.¹ In practice, most attorneys prepare a brief Trustee's Acceptance of Trusteeship document that you sign at the outset.

You have the right to decline the role, but if you do, you typically must give notice within a reasonable time and must not have already acted as trustee. If you decline, the trust document usually names a contingent successor trustee. If there is none, a court can appoint one on petition from a beneficiary.

Once you accept, you are bound by your fiduciary duties — prudent investment, loyalty, impartiality, accounting, and disclosure — and you are personally liable for breaches. You cannot "un-accept" because things get complicated.

Thinking about declining? If the trust is very complex, the family dynamics are contentious, or the assets require specialized management, declining in favor of a professional corporate trustee may be the right decision. Read Corporate Co-Trustee: When to Hire One and How to Resign as Successor Trustee before you decide. Declining before accepting is far cleaner than resigning later.

3. What changes for taxes — immediately

This is where most new trustees are caught off-guard. During the grantor's lifetime, the revocable trust is a "grantor trust" under IRC §§ 671–679.² All trust income is reported on the grantor's personal Form 1040. The trust itself files no tax return and has no EIN. For tax purposes, the trust essentially doesn't exist.

At the grantor's death, the trust loses its grantor trust status and becomes a new, independent taxpayer. The consequences:

The trust needs a new EIN

The trust must immediately apply for its own Employer Identification Number. Banks and brokerage firms will not retitle accounts into the trust's name without one, and you cannot open a trust checking account without one. Apply online at irs.gov — the process takes about 15 minutes and the EIN is issued instantly.³ See Trust EIN: Step-by-Step Guide for exact instructions.

The trust now files Form 1041

Beginning with the date of death, the trust is a separate taxpaying entity that files Form 1041 (U.S. Income Tax Return for Estates and Trusts) annually. Trust tax brackets are severely compressed: in 2026, the 37% federal bracket kicks in at approximately $16,550 of retained taxable income — compared to $751,600 for a married couple filing jointly.⁴ The 3.8% Net Investment Income Tax (NIIT) also applies at the same threshold, making retained trust income taxed at 40.8% combined federal rate.

The main tool trustees use to manage this: distributions carry out income to beneficiaries (IRC § 661), where beneficiaries pay tax at their personal rates. See Trust Distribution Decisions and Form 1041 Trustee Tax Guide.

The § 645 election — a time-sensitive opportunity

If the decedent also has a probate estate (assets that pass by will rather than through the trust), you may be able to elect under IRC § 645 to treat the revocable trust and the estate as a single entity for income tax purposes for two tax years.⁵ Benefits include: a fiscal year (which can defer income recognition), elimination of quarterly estimated tax payments for two years, and a higher personal exemption ($600 vs. $100). The deadline is the due date of the trust's first Form 1041, including extensions — and this deadline cannot be extended separately. Miss it, and it is permanently gone. See § 645 Election Guide.

4. All trust assets get a stepped-up cost basis

One of the most significant financial benefits of dying with assets inside a revocable trust: all trust property receives a new cost basis equal to fair market value as of the date of death under IRC § 1014.⁶ If your parent bought stock for $10,000 in 1985 and it's now worth $200,000, the trust's basis is reset to $200,000. If the trustee sells immediately after death, there is no capital gain.

This step-up is one of the most valuable tax planning windows in trust administration — and it closes quickly as markets move. For concentrated stock positions, the post-death window to sell and diversify at low tax cost can be weeks, not months. See Step-Up in Basis Guide and Concentrated Stock in Trust for how to act before the window closes.

What does NOT get a step-up in basis:

IRAs, 401(k)s, and other retirement accounts. These are Income in Respect of a Decedent (IRD) — the income tax deferred during the owner's lifetime is still owed when distributions are made. The trust (or individual beneficiaries) pay ordinary income tax on withdrawals. See IRAs and Trusts.
Annuities. Same IRD treatment — no step-up.
US Savings Bonds. Accrued but unpaid interest is IRD.

5. What passes through the trust — and what doesn't

The trust only controls assets that were titled in the trust's name during the grantor's lifetime. Three categories of assets typically bypass the trust entirely:

Assets with beneficiary designations. Life insurance, IRAs, 401(k)s, annuities, and accounts with TOD (transfer on death) or POD (payable on death) designations pass directly to the named beneficiaries — not through the trust. As successor trustee, you have no authority over these assets.
Jointly-owned assets with right of survivorship. A jointly-held bank account passes automatically to the surviving joint owner regardless of what the trust or will says.
Probate assets. Property that was in the grantor's name alone without a beneficiary designation must go through probate. This is the reason revocable trusts are set up in the first place — if the trust was properly funded during the grantor's lifetime, most assets should already be titled in the trust and bypass probate entirely. If key assets were not transferred to the trust ("unfunded"), there may be a probate proceeding required in parallel with trust administration.

As successor trustee, your authority is limited to trust assets. If you are also named executor in a pour-over will, you handle the probate estate separately under a different legal role. See Trustee vs. Executor: Your Dual Role.

6. Notify beneficiaries — a legal requirement

Most states following the Uniform Trust Code require the successor trustee to give written notice to all qualified beneficiaries within 60 days of the trust becoming irrevocable (UTC § 813).¹ The notice must include:

The trustee's name and contact information
The existence of the trust and the fact that the recipient is a beneficiary
The beneficiary's right to request a copy of the trust terms and any accountings

Qualified beneficiaries include current income beneficiaries plus remainder beneficiaries who would receive a distribution if the trust terminated today. If your parent's trust names children as outright remainder beneficiaries, all named children must be notified — even if you (as trustee) are also one of them.

Failure to notify extends the statute of limitations on beneficiary claims against the trustee indefinitely. This is not optional. See Trustee Accounting to Beneficiaries.

7. Estate tax — does it apply?

As of 2026, the federal estate and gift tax exemption is $15,000,000 per person — made permanent by the One Big Beautiful Bill Act (OBBBA, July 2025).⁷ The much-discussed "sunset" of the TCJA increased exemption has been permanently eliminated. Estates below $15M owe no federal estate tax. For married couples, portability allows the surviving spouse to use the deceased spouse's unused exemption, effectively doubling the exemption to $30M with a proper election.

If the estate is potentially taxable, Form 706 (United States Estate Tax Return) is due 9 months after the date of death, with a 6-month extension available (15 months total).⁸ Portability elections must also be made on Form 706 — even if no tax is due — by the same deadline. Missing the portability election means the surviving spouse loses access to the deceased spouse's unused exemption permanently.

Most estates are well below $15M, so Form 706 is not required. But if the trust holds business interests, real estate, or investment portfolios that push total combined assets toward the threshold, consult your estate attorney before the 9-month deadline.

8. The administration timeline

A typical revocable trust with liquid assets, a clear trust document, and cooperative beneficiaries takes 12–18 months to fully administer from the date of death to final distributions. The constraints are not optional paperwork — they are creditor protection periods, IRS processing timelines, and tax return due dates that cannot be accelerated. See Trust Administration Timeline: Month-by-Month for the full breakdown.

The most time-compressed deadlines in the first weeks:

Deadline	Action	Consequence of missing
2 months 16 days from death	QSST or ESBT election if trust holds S-corp stock	S-corporation election terminates for all shareholders — company loses pass-through status
Due date of first Form 1041	§ 645 election (if applicable)	Lost permanently — no fiscal year, no 2-year estimated tax exemption, no exemption pooling
9 months from death	Form 706 if taxable estate; portability election	Late filing penalties; portability permanently lost (costing surviving spouse up to $6M in exemption)
60 days from trust becoming irrevocable	Beneficiary notification (UTC § 813)	Statute of limitations on beneficiary claims doesn't begin running
Immediately	Trust EIN application	Cannot retitle accounts, open trust bank account, or begin administration

9. The successor trustee's legal duties going forward

Once you accept the role and administration begins, your ongoing duties as successor trustee are governed by the trust document and applicable state law (most states have adopted some version of the Uniform Trust Code and Uniform Prudent Investor Act). These duties are personal and non-delegable in the sense that you remain accountable even when you hire professionals to help:

Prudent investment. Under the Uniform Prudent Investor Act, you must invest as a prudent investor would given the trust's purposes, terms, and distribution requirements. Diversification is generally required; highly speculative or concentrated positions require documented justification. See Trust Investment Policy.
Impartiality. If the trust has both current beneficiaries (income) and remainder beneficiaries (future distribution), you must balance their competing interests. A portfolio that generates all income for today's beneficiary at the expense of growth for tomorrow's beneficiary may be a breach.
Loyalty. Your decisions must favor the beneficiaries collectively, not your own interests. If you are also a beneficiary (a common situation for adult children), specific self-dealing rules apply. See Can a Trustee Also Be a Beneficiary?
Accounting. Annual accountings to qualified beneficiaries are required in most states. These are formal financial statements showing all income, expenses, and distributions. See Trustee Accounting to Beneficiaries.
Liability. You are personally liable for investment losses, improper distributions, or accounting failures. Your liability exposure can exceed the value of the trust. See Trustee Liability and Protection.

Who to hire — and in what order

Most successor trustees need three professionals working in coordination:

Estate attorney. Hire first — even before you act on anything. You need interpretation of the trust terms, guidance on state-specific notification requirements, help with real estate retitling, and advice on any unusual provisions. Attorney fees run $250–$500/hour; most estates require $2,000–$15,000 in legal work depending on complexity.
CPA with fiduciary tax experience. Not all CPAs handle Form 1041 and trust-specific tax issues (DNI calculations, the § 663(b) 65-day election, K-1 preparation). Hire a specialist, not a generalist. Annual CPA fees for a trust return run $800–$3,500/year depending on complexity.
Fee-only financial advisor with trust experience. Provides investment policy design (UPIA compliance), helps evaluate the distribution vs. retain decision (compressed brackets), manages the step-up-in-basis window for concentrated positions, and — critically — charges no commissions, avoiding one of the most common trustee fiduciary complaints. See Get Matched with a Specialist.

Why the order matters. The attorney interprets what the trust requires. The CPA tells you the tax consequences of your choices. The financial advisor executes the investment and distribution strategy within those constraints. Acting without all three in place — especially for the first Form 1041 and the early distribution decisions — is where most trustee mistakes happen.

Sources

Uniform Trust Code (2000, as amended) — Uniform Law Commission. §§ 602 (revocability), 701 (acceptance of trusteeship), 813 (duty to inform and report). Enacted in 35+ states.
IRC §§ 671–679 — Grantor Trust Rules. Cornell LII. Treatment of trust income as grantor's income during the grantor's lifetime.
IRS — Apply for an EIN Online. Trusts use the "Estate of Deceased Individual" or "Trust" entity type when the grantor dies.
IRS Rev. Proc. 2025-32. 2026 trust and estate income tax brackets: 37% at $16,550 (ordinary income and short-term capital gains).
IRC § 645 — Certain Revocable Trusts Treated as Part of Estate. Cornell LII.
IRC § 1014 — Basis of Property Acquired From a Decedent. Cornell LII. Stepped-up basis to fair market value at date of death.
IRS — Estate Tax. $15,000,000 federal exemption per person (2026), made permanent by OBBBA (2025).
IRS — About Form 706, United States Estate (and Generation-Skipping Transfer) Tax Return. Due 9 months after date of death; 6-month extension available on Form 4768.

Values verified as of May 2026. Trust tax brackets per IRS Rev. Proc. 2025-32. Federal estate exemption per OBBBA (enacted July 2025). UTC provisions as enacted in applicable states — consult your estate attorney for state-specific variations.