Does a Living Trust Need an EIN or Tax ID Number?

A revocable living trust does not need an EIN while the grantor is alive; it uses the grantor’s Social Security number, and the IRS treats the trust and the grantor as the same taxpayer. That changes the moment the grantor dies or if the trust was irrevocable from day one. At that point the trust becomes its own tax entity and the trustee must apply to the IRS for an Employer Identification Number before the trust can keep operating.

Why the Grantor’s SSN Is Enough During Life

A revocable living trust is one the grantor can amend or revoke at will. Because the grantor keeps that control, the tax code classifies it as a “grantor trust,” and all income the trust’s assets produce is reported on the grantor’s personal Form 1040 under the grantor’s own Social Security number.¹ The trust files no separate return and owes no separate tax.

The IRS Internal Revenue Manual directs its own staff not to assign an EIN in these ordinary cases. When the same person is both grantor and trustee, or when spouses are the sole grantors and file a joint return, the trust uses the grantor’s SSN and everything flows through the personal 1040.² Banks and brokerages keep operating under the SSN, no Form 1041 is filed, and no separate tax year has to be tracked.

There are optional reporting methods a grantor trust can elect that do require an EIN even during the grantor’s life, but they are aimed at unusual setups such as trusts with an independent trustee or multiple unrelated grantors. The default for a typical revocable living trust is to give payers the grantor’s SSN, report on the 1040, and skip the EIN entirely.³

When a Living Trust Does Need an EIN

A living trust must have its own EIN in any of the following situations:

The grantor has died. A revocable trust typically becomes irrevocable at the grantor’s death, and the grantor’s SSN can no longer be used for the trust’s reporting.
The trust was irrevocable from the start. Some trusts are set up as irrevocable on day one, meaning the grantor has permanently given up control. These are separate tax entities from the moment they exist.
The trust has multiple grantors who are not married or do not file jointly. A single SSN cannot cover the trust’s income in that situation.²
The trust elects one of the optional grantor-trust reporting methods that require a trust EIN.

What the Successor Trustee Should Do After the Grantor Dies

The grantor’s death is what catches most families off guard. One day the trust is invisible for tax purposes, and the next it is a standalone entity with its own filing obligations.

Apply for the EIN right away. Financial institutions will freeze the trust’s accounts once they learn of the grantor’s death and will not release them until the trustee provides a new EIN. The fastest route is the IRS online application, which issues the number within minutes.⁴ Without an EIN the trust cannot open new accounts, sell assets, or make distributions.

Notify every bank and brokerage holding trust assets so they can issue 1099s under the trust’s new identity rather than the deceased grantor’s SSN going forward.

Then split the year’s income correctly. The grantor’s final Form 1040 covers income earned up to the date of death. The trust’s Form 1041 covers income earned from the date of death onward. Getting this split wrong is one of the most common mistakes successor trustees make, and it creates problems with the IRS when the numbers do not reconcile.

The Section 645 Election: One Return Instead of Two

When the grantor leaves both a revocable trust and a probate estate, the trustee and executor can jointly elect to treat the trust as part of the estate for income tax purposes. This is the Section 645 election, and it lets the trust and estate file a single combined Form 1041 rather than two returns.⁵

The election is made on Form 8855, signed by both the executor and the trustee, and it is due by the due date (including extensions) of the estate’s first income tax return. Once made, it cannot be revoked.⁵

The benefits are practical. Estates can pick a fiscal year, while standalone trusts are stuck on a calendar year. Estates get a $600 personal exemption instead of the $100 or $300 available to trusts. And estates are exempt from making estimated tax payments for the first two years after the decedent’s death, which helps cash flow during administration. The election lasts until all assets have been distributed or the applicable date arrives: two years after death if no estate tax return is required, or six months after the estate tax liability is finalized if one is.

How to Apply for the Trust’s EIN

Applying is free, and the IRS offers three ways to do it:

Online at irs.gov. The application walks the trustee through a short questionnaire and issues the number immediately on approval. This is the fastest and most common method.⁴
Fax a completed Form SS-4. The IRS typically returns the EIN within four business days.
Mail Form SS-4. Processing takes several weeks.

You will need the trust’s legal name as it appears in the trust document, the trustee’s name and SSN, the trust’s mailing address, the type of trust, and the reason for applying. The online system is only available during limited hours, roughly 7 a.m. to 10 p.m. Eastern, Monday through Friday, so plan around that if you are working against a deadline.

What Filing Looks Like Once the Trust Has an EIN

Once the trust is a separate taxable entity, it must file Form 1041 for any year in which it has taxable income, gross income of $600 or more regardless of taxable income, or a beneficiary who is a nonresident alien.⁶ That $600 threshold is low enough that virtually any trust holding investments or rental property will need to file. For calendar-year trusts, Form 1041 is due April 15.⁷

When the trust distributes income to beneficiaries, the trustee issues each one a Schedule K-1 reporting their share of income, deductions, and credits. Beneficiaries then carry those amounts to their own Form 1040.⁸ Income distributed to beneficiaries is generally taxed at the beneficiary’s individual rate rather than the trust’s.

That distinction matters more than it sounds. Trust tax brackets are compressed to a degree that surprises many trustees. For 2025, a trust hits the top 37% rate on taxable income above $15,650, while an individual does not reach that same 37% rate until taxable income exceeds roughly $609,000. Keeping income inside the trust is almost always more expensive than distributing it to beneficiaries in lower brackets, and timing distributions with that gap in mind is one of the more useful levers a trustee has.

1
Office of the Law Revision Counsel. 26 U.S. Code 671 – Trust Income, Deductions, and Credits Attributable to Grantors and Others as Substantial Owners
2
Internal Revenue Service. 21.7.13 Assigning Employer Identification Numbers (EINs) – Section: 21.7.13.5.8.3 Determining the Need for an EIN: Trusts
3
Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 – Section: Optional Filing Methods for Certain Grantor Type Trusts
4
Internal Revenue Service. Get an Employer Identification Number
5
Office of the Law Revision Counsel. 26 U.S. Code 645 – Certain Revocable Trusts Treated as Part of Estate
6
Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1
7
Internal Revenue Service. Forms 1041 and 1041-A: When to File
8
Internal Revenue Service. Instructions for Schedule K-1 (Form 1041) for a Beneficiary Filing Form 1040 or 1040-SR