EIN for Trusts: When It’s Needed, How to Apply, and Form 1041

A trust needs its own EIN once it becomes a separate taxable entity in the eyes of the IRS. That most commonly happens when the grantor of a revocable living trust dies and the trust becomes irrevocable, but it can also happen the moment an irrevocable trust is created during life or a testamentary trust comes into being under a will. Until then, a revocable trust generally reports income under the grantor’s Social Security Number and needs no separate tax identification number at all.

When a Trust Needs Its Own EIN

The dividing line is control. If the grantor can revoke, amend, or direct the trust, the IRS treats the trust as part of the grantor’s personal tax picture and the trust piggybacks on the grantor’s Social Security Number. Once that control ends, a new taxpayer exists and it needs a nine-digit EIN of its own.

Several events cross that line:

The grantor of a revocable trust dies. The trust generally becomes irrevocable by operation of law, and the successor trustee must obtain an EIN because the trust can no longer report under the decedent’s Social Security Number.
A testamentary trust comes into existence. A trust created through a will exists only after death and needs an EIN from inception.
An irrevocable trust is created during life. If the grantor retains no powers that would make it a grantor trust, the trust needs its own EIN immediately.
A trust splits into sub-trusts after a death. Estate plans often divide a revocable trust into separate shares, such as a bypass trust and a survivor’s trust, on the grantor’s death. Each sub-trust that becomes a separate taxable entity needs its own EIN.

Any trust required to file Form 1041 must have an EIN to complete that return, and the trust’s EIN is what ties each beneficiary’s Schedule K-1 back to the trust.¹

When You Don’t Need a Separate EIN

A revocable living trust during the grantor’s lifetime typically qualifies as a grantor trust. All income, deductions, and credits flow through to the grantor’s personal return, and the trustee can report everything under the grantor’s Social Security Number without filing Form 1041.

The Form SS-4 instructions confirm that a trustee does not need an EIN when using the most common grantor-trust reporting approach, in which the trustee simply furnishes payers with the grantor’s name, Social Security Number, and the trust’s address.² Two alternative grantor-trust reporting methods do require an EIN even while the grantor is alive, but they are optional and rarely used by ordinary revocable trusts.

How to Apply for a Trust EIN

The IRS offers three application methods. The right one depends on how quickly you need the number and whether the responsible party has a U.S. taxpayer identification number.

Online

The IRS online EIN assistant is the fastest option. You answer a series of questions about the trust and the responsible party, and the EIN appears on the final screen. The tool is available Monday through Friday from 6:00 a.m. to 1:00 a.m. Eastern the next day, Saturdays from 6:00 a.m. to 9:00 p.m., and Sundays from 6:00 p.m. to midnight.³ The responsible party must have a valid Social Security Number, ITIN, or EIN to use it.

Fax

Fax a completed Form SS-4 to the IRS number for your region and include a return fax number. The IRS generally faxes the EIN back within four business days.⁴

Mail

Mailing Form SS-4 to the appropriate IRS service center works but takes about four weeks.⁴ If a grantor’s death is imminent or has just occurred, don’t wait, because the number is often needed to open bank accounts or make tax deposits.

Applicants Without a U.S. Taxpayer ID

If the responsible party has no Social Security Number or ITIN and is not eligible for one, the online application is unavailable. Enter “foreign” or “N/A” on line 7b of Form SS-4 and apply by fax or mail. International applicants whose trust has no principal place of business in the United States can also apply by phone. Fax submissions from outside the U.S. go to 304-707-9471, and mailed applications go to IRS EIN International Operation, Cincinnati, OH 45999.⁵

Information You Need Before You Apply

Pull the trust instrument and the responsible party’s personal details together before you start. Missing information will stall the application or get it rejected.

Legal name of the trust. Use the exact name from the trust document, or from the will for a testamentary trust.
Date the trust was funded or created. This is a required field.
State where the trust is administered. This determines which IRS service center handles paper filings.
Responsible party’s name and taxpayer ID. The IRS requires a specific individual who controls or manages the trust’s assets, typically the grantor or acting trustee. The responsible party must be a natural person, not an entity, and you must provide that person’s Social Security Number or ITIN.⁵

On the form itself, line 9a asks for the type of entity: select “Trust” and provide the grantor’s taxpayer identification number in the space indicated.⁶ Line 10 asks why you’re applying. For a new trust, check “Created a trust” and specify the type. If a revocable trust has converted to irrevocable status, check “Changed type of organization.”²

Authorizing a Third Party

An attorney or CPA handling the application can be named as a third-party designee on Form SS-4. That authority lets them answer IRS questions and receive the assigned EIN, and it ends the moment the EIN is released.² The official confirmation notice still goes to the trust, not to the designee.

After You Receive the EIN

The CP 575 Confirmation Notice

Once the EIN is assigned, the IRS mails an official confirmation called a CP 575. It shows the trust’s legal name, address, and assigned number. Keep it with the trust instrument and financial records; it is the primary proof of the trust’s tax identity for banks, brokerages, and the IRS itself.

Opening Financial Accounts

Banks and brokerages will not open an account in the trust’s name without the EIN. Expect to bring the confirmation notice or at least the number, the trust agreement or a certification of trust, and government-issued identification for all trustees. Some institutions also ask for a death certificate when a revocable trust has become irrevocable on the grantor’s passing. Requirements vary, so call ahead.

Filing Form 1041

A trust with its own EIN generally must file Form 1041 for each year it has income. For calendar-year trusts, the return is due April 15 of the following year. Most trusts must use a calendar year; only tax-exempt trusts, charitable trusts, and wholly grantor-owned trusts may elect a fiscal year.⁷

The penalty for filing Form 1041 late is 5% of the unpaid tax for each month or partial month the return is late, up to a maximum of 25%.⁸

Estimated Tax Payments

If the trust expects to owe $1,000 or more in tax after withholding and credits, the trustee generally must make quarterly estimated payments using Form 1041-ES. Due dates are April 15, June 15, September 15, and January 15 of the following year.⁹ Missing them triggers underpayment penalties, so new trustees should plan for the cash flow immediately.

Keeping the Trust’s Tax Record Current

The EIN stays with the trust for its entire existence, but the information behind it can change. The trustee must file Form 8822-B within 60 days of any change in the trust’s responsible party. This is a common oversight when a successor trustee steps in, and letting it slide means IRS notices go to the wrong person. Address changes on the same form are technically voluntary, but skipping them can mean you never see deficiency notices or demand letters while penalties and interest continue to accrue.¹⁰

If You Lose the CP 575

The IRS will not reissue the CP 575, but it will confirm the number two other ways. You can call the IRS business and specialty tax line at 800-829-4933 (Monday through Friday, 7 a.m. to 7 p.m. local time) and request a Letter 147C after an identity check. You can also pull an entity transcript through the IRS website.¹¹

Closing the Trust’s Tax Account

When a trust terminates and distributes all its assets, file a final Form 1041 for the last tax year. Check the “Final return” box in item F and mark the “Final K-1” box on each beneficiary’s Schedule K-1.⁷

The IRS cannot cancel an EIN, but it can deactivate the account so no future filings are expected. Send a written letter with the trust’s EIN, legal name, address, the original EIN assignment notice if available, and the reason for deactivating. All outstanding returns must be filed and any taxes owed must be paid before the IRS will process the request. Mail the letter to the IRS at MS 6055 in Kansas City, MO 64108 or MS 6273 in Ogden, UT 84201.¹²

1
Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1
2
Internal Revenue Service. Instructions for Form SS-4
3
Internal Revenue Service. Get an Employer Identification Number – Section: Availability
4
Internal Revenue Service. Instructions for Form SS-4 (12/2025) – Section: How To Apply for an EIN
5
Internal Revenue Service. Instructions for Form SS-4 (12/2025)
6
Internal Revenue Service. Form SS-4 – Application for Employer Identification Number
7
Internal Revenue Service. 2025 Instructions for Form 1041 and Schedules A, B, G, J, and K-1
8
Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax
9
Internal Revenue Service. 2026 Form 1041-ES
10
Internal Revenue Service. Change of Address or Responsible Party – Business
11
Internal Revenue Service. Employer Identification Number
12
Internal Revenue Service. If You No Longer Need Your EIN