Do You Need a Social Security Number to Set Up a Trust Fund?

You do not necessarily need a Social Security Number to set up a trust fund, but some taxpayer identification number is required. A revocable living trust generally uses the grantor’s SSN while the grantor is alive. An irrevocable trust, or a revocable trust after the grantor dies, needs its own Employer Identification Number from the IRS. Which number applies depends on the type of trust, who created it, and whether that person is still living.

When Your Own SSN Is Enough

If you create a revocable living trust, you generally do not need a separate identification number for the trust at all. The IRS treats a revocable trust as an extension of you, the grantor, while you’re alive. Income from trust assets is reported on your personal Form 1040 under your own SSN. Federal law requires every return and tax document to include a proper identifying number, and for individuals that number is the SSN.¹

Most people setting up a basic living trust can stop worrying at that point. You use your SSN, report trust income on your personal return, and move on. The stricter identification rules start once the trust becomes irrevocable or you pass away.²

When the Trust Needs Its Own EIN

An Employer Identification Number is a nine-digit number the IRS assigns to entities like businesses, estates, and certain trusts. It functions as the trust’s own tax ID. Several situations require one:

Irrevocable trusts. Once a trust is irrevocable, the IRS treats it as a separate taxpayer that must file its own Form 1041.
Death of the grantor. When the person who created a revocable trust dies, the trust typically becomes irrevocable. The grantor’s SSN can no longer be used, and the successor trustee must obtain a new EIN.
Trusts with reportable income. Any trust required to file Form 1041 must have an EIN. The filing threshold is $600 or more in gross income, or any amount of taxable income.

Every trust required to file Form 1041 must have an EIN.² Banks and brokerages will also use the EIN when opening or maintaining accounts in the trust’s name, so the trust can’t hold assets or process transactions without one.

Successor trustees who put off getting a new EIN after the grantor dies run into practical problems fast. Banks may freeze accounts tied to the deceased grantor’s SSN, and the trust cannot file its required tax return without an EIN. There is no separately published deadline for getting the number itself, but the trust’s first Form 1041 is due by the 15th day of the fourth month after the close of its tax year, and that return can’t be filed without one.

How to Get a Trust EIN

Getting an EIN from the IRS is free. You should not pay a third-party website for this service, despite many sites that try to charge for it.³

The fastest method is the IRS online application at irs.gov/EIN. The person applying (usually the trustee) needs their own SSN or ITIN to verify identity. During the application, you select “trust” as the entity type, choose whether the trust is revocable or irrevocable, enter the trustee’s information, provide the trust name and the date it was funded, and submit. If approved, the IRS issues the EIN immediately on screen. The online system is available Monday through Friday, 7:00 a.m. to 10:00 p.m. Eastern.⁴

If online isn’t an option, you can also apply by fax or mail using Form SS-4. Fax applications typically take about four business days. Mail applications should be sent four to five weeks before you’ll need the number.⁴

Beneficiaries and Their Own Numbers

Beyond the trust itself, individuals connected to the trust need their own taxpayer identification numbers for tax reporting. The IRS treats a trust’s tax return as a document with respect to each beneficiary, so the trust must furnish each beneficiary’s identifying number on its filings.¹

When a trust distributes income, the trustee reports each beneficiary’s share on Schedule K-1 of Form 1041. That form includes the beneficiary’s SSN, although copies sent to the beneficiary may show only the last four digits for security.⁵ Beneficiaries then use the K-1 to report trust income on their own personal returns. To collect the right information, trustees typically ask beneficiaries to complete Form W-9, which certifies name, address, and taxpayer identification number.⁶

Being named as a beneficiary does not mean an SSN has to appear in the trust document itself. The SSN is needed for tax reporting, not for the legal creation of the trust. Keeping SSNs out of trust documents is common practice, since trusts can sometimes become part of court records.

Beneficiaries Without an SSN: The ITIN Route

Not everyone involved in a trust is eligible for a Social Security Number. Non-resident aliens named as beneficiaries of U.S. trusts still need a taxpayer identification number to receive distributions and satisfy IRS reporting. The answer is an Individual Taxpayer Identification Number, a nine-digit number the IRS issues to individuals who need a U.S. taxpayer ID for federal tax purposes but don’t qualify for an SSN.⁷

The trustee needs the beneficiary’s ITIN to complete Schedule K-1, and the beneficiary may need it to claim treaty benefits or to file a U.S. return reporting trust income.⁸ Applying requires Form W-7 along with original identity documents or certified copies from the issuing agency proving both identity and foreign status.⁹ The IRS advises allowing seven weeks for processing, and during tax season (January 15 through April 30) or for overseas applicants, nine to eleven weeks.⁷ If a distribution depends on having the beneficiary’s ITIN in hand, plan for that timeline well in advance.

What Missing or Wrong Numbers Cost

Failing to provide the right taxpayer identification number for a trust carries real financial consequences.

Backup Withholding

If a beneficiary doesn’t furnish a correct TIN, or if the IRS notifies the payor that the TIN on file is wrong, the payor must withhold 24% of the payment under federal backup withholding rules.¹⁰ The beneficiary receives significantly less than expected until the withheld amount is reclaimed on a tax return.

Information Return Penalties

Trustees who file information returns with missing or incorrect TINs face per-return penalties. For 2026, the IRS schedule is:

Filed up to 30 days late: $60 per return
Filed 31 days late through August 1: $130 per return
Filed after August 1 or not filed at all: $340 per return
Intentional disregard: $680 per return, with no maximum cap

The intentional disregard tier has no ceiling.¹¹ For trusts with multiple beneficiaries and frequent distributions, these penalties stack quickly.

Quick Reference by Trust Type

Revocable trust while the grantor is alive: grantor’s SSN; no separate EIN needed.
Irrevocable trust: the trust’s own EIN, obtained free from the IRS.
Revocable trust after the grantor’s death: new EIN required; the grantor’s SSN can no longer be used.
Beneficiaries receiving distributions: each beneficiary’s SSN or ITIN is needed for Schedule K-1.
Foreign beneficiary without an SSN: must apply for an ITIN using Form W-7 before distributions can be properly reported.

The EIN is always free from the IRS and can be obtained online in minutes.³ The most common and costly mistake is not failing to pick the right number, but delaying too long after a triggering event like the grantor’s death, which can freeze accounts and produce penalties that were entirely avoidable.

1
Office of the Law Revision Counsel. 26 USC 6109 – Identifying Numbers
2
Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 (2025)
3
Internal Revenue Service. Get an Employer Identification Number
4
Internal Revenue Service. Instructions for Form SS-4 Application for Employer Identification Number
5
Internal Revenue Service. 2025 Instructions for Schedule K-1 (Form 1041) for a Beneficiary Filing Form 1040 or 1040-SR
6
Internal Revenue Service. Form W-9 Request for Taxpayer Identification Number and Certification
7
Internal Revenue Service. Individual Taxpayer Identification Number (ITIN)
8
Internal Revenue Service. U.S. Taxpayer Identification Number Requirement
9
Internal Revenue Service. Instructions for Form W-7 (12/2024)
10
Internal Revenue Service. Backup Withholding
11
Internal Revenue Service. Information Return Penalties