You do not need an EIN for a revocable living trust while you are alive and the trust can still be changed. The IRS treats you and the trust as the same taxpayer during that period, so your Social Security number covers everything the trust earns or reports. A separate EIN becomes necessary once the trust turns irrevocable, which for most people happens at the grantor’s death.1Office of the Law Revision Counsel. 26 U.S. Code 676 – Power to Revoke
While You’re Alive, Your SSN Is Enough
Federal tax law treats anyone who keeps the power to revoke a trust as the owner of everything in it for income tax purposes.1Office of the Law Revision Counsel. 26 U.S. Code 676 – Power to Revoke Because you can pull the assets back at any time, the IRS sees no meaningful separation between you and the trust. Interest, dividends, rental income, capital gains, all of it gets reported on your personal Form 1040 under your Social Security number. The trust does not file a separate tax return.2Internal Revenue Service. Abusive Trust Tax Evasion Schemes – Questions and Answers
The same rule holds if you become incapacitated and a successor trustee steps in to manage things for you. As long as you are alive and the trust document still permits revocation, it remains a grantor trust. The successor trustee keeps using your Social Security number on trust accounts.
When Banks Ask for an EIN Anyway
Some banks will tell you an EIN is required to open or retitle an account in the trust’s name, even while you are alive and acting as trustee. The IRS does not require this. If a bank insists, that is internal bank policy, not a legal obligation. You can try another branch or institution, or simply apply for an EIN to satisfy the request. Getting one is free and does not by itself create a tax filing requirement.
When the Trust Does Need Its Own EIN
Once the trust can no longer be revoked, it stops being an extension of you for tax purposes and becomes its own taxpayer. That transition is what triggers the need for a separate EIN. A few situations cause it.
Death of the Grantor
This is by far the most common trigger. When the grantor dies, the trust becomes irrevocable by operation of law. The successor trustee should apply for an EIN promptly so that post-death income can be reported under the trust’s own number. Financial institutions typically freeze trust accounts once they learn of the death and will not release the freeze until the successor trustee provides the new EIN.3Internal Revenue Service. Publication 1635 – Understanding Your EIN
Other Irrevocability Triggers
Some trust documents make the trust irrevocable before the grantor dies, for instance when the grantor reaches a specified age or when a particular event occurs. If the trust becomes irrevocable for any reason while the grantor is alive, it generally needs an EIN at that point because it is no longer a grantor trust.
A Trust With Employees or an Operating Business
If the trust runs a business with employees, it needs an EIN regardless of whether it is revocable or irrevocable. Payroll tax withholding and reporting require one. A trust that holds only investment assets and employs nobody avoids this requirement while the grantor is alive.
Foreign Trust Reporting
A less obvious trigger involves foreign structures. If a revocable trust holds assets through a foreign trust, it may need an EIN to file Form 3520-A, the annual information return for foreign trusts with a U.S. owner.4Internal Revenue Service. Foreign Trust Reporting Requirements and Tax Consequences The IRS requires the foreign trust to use an EIN rather than the grantor’s Social Security number on that form, even while the grantor is alive.
How to Apply
Applying is free. The IRS is explicit that no fee is ever charged for an EIN.5Internal Revenue Service. Get an Employer Identification Number Third-party sites that charge for the service are simply filling out the same free application for you.
There are three ways to apply:6Internal Revenue Service. Instructions for Form SS-4 (12/2025) – Application for Employer Identification Number (EIN)
- Online, which issues the EIN immediately.
- By fax, using Form SS-4, with the EIN typically returned by fax within four business days.
- By mail, using Form SS-4, which takes four to five weeks.
The application asks for the legal name of the trust as it appears in the trust document, the trustee’s name on the “care of” line, the mailing address, and the name and Social Security number of the trust’s “responsible party.” For trusts, the responsible party is the grantor. If the grantor has died and the successor trustee is applying, the responsible party is typically the successor trustee.7Internal Revenue Service. Instructions for Form SS-4 (Rev. December 2025) – Application for Employer Identification Number (EIN) You will also select a reason for applying, such as “trust” or “created a trust.” A later change of trustee does not require a new EIN; the trust keeps its existing number.
After the Grantor Dies: The Section 645 Option
When a grantor dies and there is also a probate estate, the successor trustee and the executor can jointly elect to treat the revocable trust as part of the estate for income tax purposes. This is the Section 645 election, and it can simplify administration and buy useful time.8Office of the Law Revision Counsel. 26 U.S. Code 645 – Certain Revocable Trusts Treated as Part of Estate
Here is why it matters. An irrevocable trust without the election must use a calendar tax year, so its first return covers the stub period from the date of death through December 31. An estate can choose any fiscal year ending within 12 months of the date of death. If the grantor dies in September, the estate could pick an August 31 year-end, pushing the first filing deadline well into the following year. That extra time helps with gathering records and making distribution decisions.
The election also exempts the trust from making estimated tax payments during the election period, which generally runs for two years after death if no estate tax return is required, or six months after the estate tax liability is finalized if one is. During that window, the estate and trust file a single Form 1041 rather than two returns.9Internal Revenue Service. Form 8855 – Election To Treat a Qualified Revocable Trust as Part of an Estate
To make the election, the trustee and executor file Form 8855 by the due date, including extensions, of the estate’s first income tax return. The election is irrevocable once made. If trust assets are not fully distributed by the time the election period ends, the trust will need a new EIN and will begin filing its own returns on a calendar-year basis.
What Filing Looks Like Once the Trust Has an EIN
An irrevocable trust with its own EIN is responsible for filing Form 1041, the income tax return for estates and trusts. The return is required for any year in which the trust has at least $600 in gross income or has a nonresident alien as a beneficiary.2Internal Revenue Service. Abusive Trust Tax Evasion Schemes – Questions and Answers
It is due by the 15th day of the fourth month after the close of the trust’s tax year. For a calendar-year trust, that means April 15.10Internal Revenue Service. Forms 1041 and 1041-A – When To File Unless the Section 645 election applies, the trust must use a calendar year.11Internal Revenue Service. Tax Years
Trust income tax brackets are severely compressed compared to individual brackets, which is worth understanding before income starts piling up inside the trust. For 2026, a trust hits the top 37% federal rate on taxable income above just $16,000. An individual would not reach that rate until income exceeded roughly $626,000. Any income retained in the trust rather than distributed to beneficiaries is taxed at the top rate very quickly. Distributing income to beneficiaries in lower brackets is one of the most common ways trustees manage this, since distributed income generally shifts the tax to the beneficiary’s personal return.
Trusts are also generally required to make quarterly estimated tax payments, and underpayment carries penalties. The Section 645 election waives estimated payments during the election period, which is one of its more practical benefits while a successor trustee is still sorting out the trust’s finances.