EIN for a Trust or Estate: How to Get the Tax ID Number

Does a trust need an EIN?

The question turns on whether the trust is a separate taxpayer from the person who created it.

Revocable living trust, grantor still living

Usually no EIN. While the grantor can still amend or revoke the trust, the IRS treats it as a grantor trust: the income belongs on the grantor’s own return and the trust uses their Social Security number. Many people set up a living trust, are told by a bank that they need a tax ID, and apply for one they did not need.

Irrevocable trust

Yes. An irrevocable trust cannot be undone by the person who created it, so it is its own taxpayer with its own filing obligation and needs its own EIN. This includes a revocable trust that has become irrevocable, which is what happens when the grantor dies — the most common reason a trustee ends up on this page.

Trust created by a will

Yes. A testamentary trust comes into existence at death and is separate from both the deceased person and their estate. An executor who is also the trustee frequently needs two numbers: one for the estate and one for the trust. They are not interchangeable.

Tax ID number for an estate

An estate needs an EIN, and usually needs it early. Banks will not open an estate account without one, and the estate account is where the executor is supposed to collect the deceased person’s assets before anything is distributed. Form 1041, the income tax return for an estate, also requires it.

The estate’s EIN is not the deceased person’s Social Security number and does not replace it. The SSN belongs to the final personal return; the EIN belongs to the estate. Executors who use the SSN for estate income create a mismatch that surfaces later, when it is considerably harder to unwind.

Who applies — the executor or the trustee?

The IRS wants a responsible party: a real person with authority over the assets, named with their own Social Security number or ITIN. For an estate that is the executor, administrator or personal representative. For a trust it is the trustee. A lawyer preparing the paperwork is not the responsible party, and naming one is a common reason an application is rejected or has to be corrected afterwards.

You sign in a fiduciary capacity rather than as an owner, because that is what you are: someone holding assets for somebody else.

What the SS-4 asks that catches people out

Form SS-4 is one page, and the parts that go wrong for estates and trusts are consistent enough to name.

• Line 9a, entity type. Estate and Trust are separate boxes, and the estate box asks for the decedent’s SSN. Tick the wrong one and the IRS issues a number for the wrong kind of taxpayer — correcting it later means a letter and a wait.
• Line 10, reason for applying. A trust uses “created a trust” and must specify which type. An estate does not use that reason at all.
• Trust type. Revocable, irrevocable, guardianship, conservatorship, custodianship, escrow and bankruptcy estates are treated differently. This is the answer that decides how the trust is taxed thereafter.
• The name. An estate is generally the deceased person’s name followed by an indication that it is an estate. A trust uses the trust’s legal name from the trust document, not the trustee’s name.
• The date. For an estate this is the date of death, not the date you are filling in the form.

How to apply, and what goes wrong

The IRS’s online application issues the number in the same session when it completes. It is worth knowing what it demands of you before you start, because executors run into all three of these.

• It is open on a schedule, not around the clock, and it cannot be saved. It is one sitting, and it times out after a period of inactivity — if you stop to find the trust document or a date of death, you start again from the top.
• It rejects without explaining. The application can end in a reference number instead of an EIN, and the online tool has no way to resolve it. See reference number 101, the most common one.
• Nothing checks your answers. The entity type, trust type and responsible party are accepted as entered. A wrong Line 9a produces a valid EIN attached to the wrong kind of taxpayer, and you usually find out when a bank or the 1041 does not agree with it.

Faxing Form SS-4 avoids the session and the schedule entirely, and is the route that works when the online application will not complete. Every method and its real timeline compares all four.

Where we fit

We prepare and file the SS-4 for estates and trusts, which means the entity type, the trust type, the fiduciary capacity and the responsible party are decided by somebody who fills this form in every business day rather than by an executor reading IRS instructions for the first time. Our application asks the questions that actually determine those answers, we file it, and if the IRS blocks the application we deal with that rather than handing it back to you.

Most people settling an estate are doing it once, on a deadline, in a month they would rather not remember. That is the case for not doing this yourself — not that the form is impossible, but that the cost of a wrong box on it lands months later.

How long it takes

The online application issues the EIN immediately when it completes. Faxed applications come back in roughly four business days, and mailed ones take about four weeks. If a bank or a probate court is waiting, those differences matter — the honest timeline for every method sets out what to expect.