EIN for a Trust or Estate 2026: Who Needs One, Form SS-4, Form 56

Who needs an EIN: the decision table

Most search results for “trust EIN” answer one case, the revocable trust, and stop. The IRS documents sort the cases by who is treated as owning the trust and whether the trust must file Form 1041. The table follows them. The rows marked “our reading” apply a rule to a trust type the document does not name.

Two limits sit behind the table. A trustee of two or more trusts “must make a separate return for each trust” (26 CFR 1.6012-3(a)(4)), so each trust gets its own number (our reading). And the IRS says an EIN is for business activities and never replaces your own number: “Don’t show your SSN as an EIN on returns.” (Instructions for Form SS-4).

The three optional methods, side by side

The Form 1041 instructions give a trust that is owned by its grantor three ways to report. The trustee picks one, and changing later has rules (a final Form 1041 for the year before the change, under 26 CFR 1.671-4(g)).

Six kinds of trust cannot use any of the three: a common trust fund, a foreign trust or one with assets outside the United States, a qualified subchapter S trust, a trust owned by a grantor whose tax year is not the calendar year, a trust with an owner who is not a U.S. person, and a trust with an owner who is an exempt recipient for information reporting (unless another owner is not). Those trusts file Form 1041 with their own number (Instructions for Form 1041, Exceptions).

The trade-off is plain from the text. Method 1 means no separate number and no 1099 work, but every payor holds the owner’s personal number and the owner must hand over a Form W-9. Methods 2 and 3 move that work to the trustee. None of the IRS documents we read says what a bank or a brokerage will accept; that is a matter for the institution (our reading). Our guide to putting real estate into a living trust covers the deed side, and the one on revocable versus irrevocable trusts covers who pays tax on the income.

When the grantor dies, the trust needs a new number

The Treasury Regulation is direct. A trust “all of which is treated as owned by a decedent” as of the date of death “must obtain a new taxpayer identification number following the death of the decedent if the trust will continue after the death of the decedent” (26 CFR 301.6109-1(a)(3)(i)(A)). The trustee then “must furnish payors with a new Form W-9” showing the trust’s name, the new number and the trustee’s address (paragraph (a)(3)(ii)). The Form 1041 instructions repeat the point for revocable trusts: “All QRTs must obtain a new TIN following the death of the decedent whether or not a section 645 election is made.”

What does not change the answer:

• A section 645 election. If the executor and trustee elect to treat the trust as part of the estate, the trust still gets a new number at death. The election period runs from the date of death to the earlier of the day all assets are distributed or the day before the applicable date, which is 2 years after death if no Form 706 is required. Form 8855 is due by the due date of the estate’s first Form 1041. Our guide to trust and estate tax brackets works through the election with numbers.
• A trust with several owners. If one owner dies and the decedent’s portion stays in the original trust with the other portions, the trust keeps the number assigned before the death (26 CFR 301.6109-1(a)(3)(i)(B)).
• The end of a 645 election. An electing trust that continues afterwards needs no new TIN unless an executor agreed to the election after the trust filed as an estate, or no executor was appointed and the revocable trust was the filing trust (Instructions for Form 1041).

Applying: line by line for a trust and for an estate

The Form SS-4 instructions are specific about the entries that differ. The table lists them for the two entities.

How fast the number comes:

Three cautions from the instructions. Use one method per entity: “Use only one method for each entity so you don’t receive more than one EIN for an entity.” Report a change of responsible party on Form 8822-B within 60 days. And if the number has not arrived when a return is due, write “Applied For” and the date, not the SSN.

Form 56: the second filing for an executor or trustee

Form 56 is the notice of fiduciary relationship under section 6903. The Instructions for Form 56 (Rev. June 2026) say it notifies the IRS “of the creation or termination of a fiduciary relationship,” and the regulation says every person acting for another in a fiduciary capacity “shall give notice thereof to the district director in writing” (26 CFR 301.6903-1(a)). The consequence of skipping it is spelled out: if the notice is not filed before a notice of deficiency is sent, “no notice of the deficiency will be sent to the fiduciary” (paragraph (c)). The notice goes to the taxpayer’s last known address instead.

• Order. Publication 559 says to file it “as soon as all the necessary information (including the EIN) is available,” so the estate’s EIN comes first.
• One per person. “File a separate Form 56 for each person for whom you’re acting in a fiduciary capacity.” An executor who files the decedent’s final Form 1040 and the estate’s return files one for the decedent (with the decedent’s SSN) and one for the estate (with its EIN).
• Proof. For a testate or intestate estate with a court appointment, attach current letters testamentary or a court certificate (lines 1a and 1b). A trustee checks line 1e, “named a trustee under a valid instrument,” and enters the date of appointment or of the transfer of assets.
• Ending it. The notice stays in effect until a Form 56 reports the end of the relationship. Publication 559 says the same form is used when a successor is appointed.
• What it is not. It does not update an address (use Form 8822 or Form 8822-B), and it is not a power of attorney (use Form 2848).

One estate, one rental: the numbers on a first-year timeline

The assumptions are ours and round. An owner dies on March 10, 2026. The owner held a rental house directly, at $2,400 of rent a month, and no trust owned it. The executor is appointed and receives letters.

• Why an EIN at all. Income received after the date of death belongs on the estate’s Form 1041, not on the decedent’s final Form 1040 (Publication 559). The filing line is $600 of gross income. One rent payment of $2,400 is 4.0 times the line (2,400 divided by 600), and at $2,400 a month the line is reached in 7.5 days of rent (600 divided by 2,400, times 30); a full year is $28,800 (our arithmetic).
• Which number the rent is reported under. Publication 559 warns: “Don’t use the deceased individual’s identifying number to file an individual income tax return after the decedent’s final tax return.” After the final Form 1040, the decedent’s SSN is no longer the number for the rent; the estate’s EIN is.
• When the first return is due. On a calendar year, the 2026 Form 1041 is due April 15, 2027. If the executor picks a fiscal year ending February 28, 2027, the return is due the 15th day of the fourth month after the close, June 15, 2027, with a 5½-month extension available on Form 7004 (our arithmetic on the Form 1041 instructions). For how the year choice moves income between returns, see trust tax brackets and the estate fiscal year.
• Estimated tax. An estate does not owe estimated tax for a tax year ending before 2 years after the date of death (Instructions for Form 1041), which in this example means before March 10, 2028.

If the house sat in a trust instead, with the grantor living and Method 1 in use, the same rent would stay on the grantor’s own Form 1040 and no estate would exist. After the grantor’s death a continuing trust would need a new number (26 CFR 301.6109-1(a)(3)(i)(A)). The probate guide covers the step before the EIN, and the step-up in basis guide covers the tax basis the house takes at death.

If the rental sits in a limited liability company. The Form SS-4 instructions say a domestic LLC with one member is, by default, “disregarded as an entity separate from its owner,” and one with two or more members “is treated as a partnership.” An LLC that “has acquired one or more additional owners and its classification has changed to partnership” applies for an EIN checking the Partnership box. Reading that against an inherited LLC: if the interests pass to two or more heirs, the LLC’s classification may change and a new EIN may be needed; whether it does depends on the state-law result, not on anything in the Form SS-4 instructions (our reading). The LLC for rental property guide covers the entity.

What a reader can do with this

• Find out which trust you have. Read the trust document for who can revoke it and who is treated as owner. The answer decides whether the rows above for Method 1, 2 and 3 apply or the trust is a separate taxpayer.
• Ask the trustee which reporting method is in use. A trust that gives payors the grantor’s number is on Method 1. One that gives them its own number is on Method 2, 3 or Form 1041.
• Mark the death date. If the grantor dies, the new number and new Forms W-9 for every payor are the trustee’s first filing job.
• Apply online yourself. The Form SS-4 instructions say the online application is free of charge, and the mail and fax routes take days or weeks.
• Keep the two notices straight. The EIN goes on the returns and to payors; Form 56 goes to the IRS with the court papers and the EIN.

Whether a particular trust should report under Method 1, 2 or 3, and whether a section 645 election fits, is a question for the attorney who drafted the documents and the preparer who files the returns.

FAQ

Sources, read and saved on October 22, 2026: Instructions for Form SS-4 (Rev. December 2025) and Form SS-4 (Rev. December 2025), irs.gov; Instructions for Form 56 (Rev. June 2026) and Form 56 (Rev. June 2026), irs.gov; Instructions for Form 1041 and Schedules A, B, G, J and K-1 (2025), irs.gov; IRS Publication 559, Survivors, Executors, and Administrators (2025); 26 CFR 301.6109-1, 1.671-4, 1.6012-3 and 301.6903-1 (eCFR, current to October 2026). Timelines, the rent-versus-threshold ratios and the fiscal-year due date are our arithmetic on the assumptions stated. This is analysis of public documents, not investment, legal or tax advice.