EIN for an Irrevocable Trust: When It Is Required and How the Trustee Gets It

Why an irrevocable trust cannot use the grantor’s SSN

A revocable living trust is ignored for tax while its creator is alive; the creator can undo it at any time, so the IRS treats its income as theirs and its accounts run under their SSN. An irrevocable trust is the opposite arrangement. The grantor gave the property away, cannot take it back, and the trust is a separate taxpayer with its own return. Banks know this, which is why the first request when you open a trust account is the trust’s EIN. Revocable versus irrevocable, and the moment one becomes the other.

The trusts this covers

• Irrevocable life insurance trust (ILIT). Needs the EIN to own the policy and to hold the account premiums are paid from.
• Special needs or supplemental needs trust. Holds assets for a beneficiary receiving benefits; the account is in the trust’s name under its EIN.
• Asset protection or Medicaid planning trust. Created to move property out of the grantor’s estate years in advance.
• Trust for a minor or a spendthrift beneficiary.
• A formerly revocable trust after the grantor’s death. It became irrevocable on that date and needs a number then; that case has its own guide.

The grantor-trust exception

Some irrevocable trusts are drafted so the grantor keeps a specific tax power, which makes the trust a “grantor trust” for income tax even though it is irrevocable for every other purpose. An intentionally defective grantor trust is the usual example. The IRS lets such a trust report under the grantor’s SSN using one of the optional reporting methods, so an EIN is not strictly required for tax. In practice the trustee gets one anyway: banks and brokerages ask for it, and the trust will need it the day the grantor dies. If your trust document was drafted with a grantor-trust power, your attorney will have said so.

Who applies, and what the SS-4 asks

The trustee applies. The trustee is the responsible party on Line 7, with their own SSN or ITIN, because the trustee controls the trust’s assets. The grantor is named in a different place.

• Line 1. The trust’s name as written in the trust document, including the date if the name carries one, for example “The Smith Family Irrevocable Trust dated March 3, 2026”.
• Line 3. The trustee’s name.
• Lines 7a and 7b. The trustee, with the trustee’s SSN or ITIN.
• Line 9a. Trust, with the grantor’s SSN in the box beside it. This is where the grantor goes.
• Line 10. Created a trust, naming the type.
• Line 11. The date the trust was funded, which is usually the date it was signed.
• Line 12. December. Trusts must use a calendar year.
• Signature. The trustee, with the title “Trustee”.

Every line of the SS-4, explained.

After the number arrives

Open the trust’s account under the EIN, retitle the assets being transferred into the trust, and note the filing obligation: Form 1041 each year the trust has any taxable income or gross income above the filing floor, with a Schedule K-1 to each beneficiary who received a distribution. Most states with an income tax want a matching trust return. Keep the IRS confirmation; a lost one is replaced with a 147C letter.

Quick answers

The grantor is alive. Does the trust still need an EIN?

Yes, if it is irrevocable and not a grantor trust. The grantor being alive is what lets a revocable trust skip the EIN; it does not help an irrevocable one.

Can the grantor be the responsible party?

Only if the grantor is also the trustee. The responsible party is whoever controls the trust’s assets, and for most irrevocable trusts that is deliberately someone else.

Does the trust need a new EIN when the trustee changes?

No. The trust keeps its number. Report the new trustee to the IRS on Form 8822-B. Every change that does and does not need a new EIN.

Does a revocable trust need an EIN?

Not while the grantor is alive and is a trustee. Why a trust needs an EIN at all covers when the answer flips.