When a Trust Needs an EIN — and When It Doesn’t

Quick Answer

Most trusts need their own EIN — but a revocable living trust generally does not while the grantor is alive, because the IRS lets it report under the grantor’s Social Security number. That changes at the grantor’s death: the trust becomes irrevocable and must obtain a new EIN. IRS Publication 1635 is explicit that a new EIN is required when "the revocable trust changes to an irrevocable trust." A trustee change, by contrast, never requires a new number.

Trust EIN questions almost always come down to one distinction: who does the IRS think owns the trust’s income? While a grantor owns it — the typical revocable living trust — the trust can be invisible for income tax purposes and use the grantor’s SSN. When no grantor owns it — an irrevocable non-grantor trust, or any trust after the grantor dies — the trust is its own taxpayer and needs its own EIN.

The rules live in IRS Publication 1635, the Form SS-4 instructions, and the Form 1041 instructions’ optional reporting methods. Here is how they fit together.

Revocable living trusts: usually no EIN while the grantor is alive

A revocable trust is a grantor trust by definition — Publication 1635 puts it flatly: "A revocable trust may be revoked and is considered a grantor trust (IRC § 676)." Because the grantor is treated as owning everything in it, the IRS’s Optional Method 1 lets the trustee skip both the EIN and Form 1041 entirely: the trustee gives payers the grantor’s name, taxpayer identification number, and the trust’s address, and all income lands directly on the grantor’s own return.

The Form 1041 instructions confirm the shortcut: grantor trusts that haven’t applied for an EIN and file under Optional Method 1 "don’t need an EIN for the trust as long as they continue to report under that method." If a bank insists on an EIN for a revocable trust account anyway, that is the institution’s policy preference — the IRS does not require the number for this arrangement.

The moment that changes: the grantor’s death

At death, the power to revoke dies too, and the trust becomes irrevocable. Publication 1635 lists this as a new-EIN event: a new number is required when "the revocable trust changes to an irrevocable trust." The Form 8855 instructions state the same rule for qualified revocable trusts: the trustee "must obtain a new employer identification number (EIN) for the QRT upon the death of the decedent."

The Form 1041 instructions add the practical step — all qualified revocable trusts must obtain the new number whether or not a section 645 election is made, and the trustee should use Form W-9 to hand the new EIN to every payer. The grantor’s SSN stops being a valid reporting number for trust income the day the grantor dies.

Also new-EIN events per Publication 1635: a trust changes to an estate, or a living (inter vivos) trust changes to a testamentary trust. NOT new-EIN events: the trustee changes, or a grantor or beneficiary changes their name or address.

Irrevocable trusts: almost always their own taxpayer

An irrevocable non-grantor trust files Form 1041 under its own EIN from the start. One nuance worth knowing: "irrevocable" does not automatically mean "non-grantor." Publication 1635 notes that an irrevocable trust "can be treated as a simple, complex, or grantor trust, depending on the powers listed in the trust instrument." An irrevocable trust that is still a grantor trust under sections 671–677 may be able to use the optional grantor-trust reporting methods — but most irrevocable trusts operate as separate taxpayers with their own numbers.

Multiple trusts, multiple numbers

The IRS counts trusts, not families. Publication 1635: "Separate EINs are needed if one person is the grantor/maker of multiple trusts. For example, if you have a trust for each of your grandchildren, each trust must have a separate EIN and file a separate tax return. However, a single trust with several beneficiaries requires only one EIN."

Applying: same free channels as any EIN

Trusts apply exactly like estates: the IRS online EIN Assistant issues the number immediately, a faxed Form SS-4 generally returns it within 4 business days, and mail takes about 4 weeks. The application is always free. For trusts, the responsible party is the grantor, owner, or trustor — and the one-EIN-per-day limit is applied to that person, not the trustee.

Frequently asked questions

Does my revocable living trust need an EIN right now?⌄
If you are the living grantor of your own revocable trust, generally no. Under the IRS’s Optional Method 1 the trustee reports under your SSN and the trust files no Form 1041 — no EIN required as long as reporting continues under that method.
What happens to the trust’s tax ID when the grantor dies?⌄
The trust must get its own new EIN. The revocable trust becomes irrevocable at death, which IRS Publication 1635 lists as a new-EIN event, and the Form 8855 instructions require a new EIN for a qualified revocable trust "upon the death of the decedent." The trustee should give the new number to payers using Form W-9.
Do we need a new EIN when the trustee changes?⌄
No. Publication 1635 is explicit: a trustee change does not require a new EIN, and neither does a grantor or beneficiary changing their name or address.
I set up a trust for each of my three grandchildren. One EIN or three?⌄
Three. The IRS requires a separate EIN and a separate return for each trust, even with a common grantor. It is one trust with several beneficiaries that needs only a single EIN.
Is an irrevocable trust always taxed as its own entity?⌄
Not always. An irrevocable trust can still be a grantor trust if the trust instrument keeps certain powers alive under IRC sections 671–677 — Publication 1635 notes an irrevocable trust can be simple, complex, or grantor depending on those powers. But a typical irrevocable non-grantor trust files its own Form 1041 under its own EIN.

Related guides

More in Estates, Trusts & Form 1041

Official sources

Tax rules, rates and deadlines change — verify current requirements against the IRS sources above before acting. This guide is general information, not tax or legal advice.

Trust now filing its own return?

When a trust becomes its own taxpayer, TaxFilingCenter e-files its Form 1041 online — with Schedule K-1s for beneficiaries and an IRS acknowledgment when the return is accepted.

Get Started