Yes, most trusts need a tax ID number from the IRS

A trust tax ID, officially called an Employer Identification Number (EIN), is a nine-digit number the IRS assigns to identify a trust for tax purposes. Most trusts that earn income—from investments, rental property, or business operations—must obtain one. The main exception is a revocable living trust that reports all income on the grantor's (creator's) personal tax return during their lifetime; those trusts do not need a separate EIN.

If your trust generates taxable income, holds assets in its own name, or will file its own tax return, you will need an EIN. The IRS uses this number to track the trust's income, deductions, and tax obligations. Without one, you cannot open a trust bank account, file a trust tax return, or report the trust's financial activity to the IRS.

Key Takeaways

  • Revocable living trusts that report income on the grantor's personal return do not need an EIN, but irrevocable trusts and trusts earning significant income almost always do.
  • You can obtain an EIN for a trust online through the IRS website, by phone, by mail, or through a tax professional, and the online method is fastest.
  • The EIN process requires the trust document, the grantor's or trustee's Social Security number, and basic information about the trust's structure and income sources.
  • Once assigned, an EIN is permanent and does not change even if the trustee changes or the trust is modified.
  • A trust with an EIN must file Form 1041 (U.S. Income Tax Return for Estates and Trusts) if it has taxable income above a certain threshold, which varies by year.

When a trust must have an EIN

An irrevocable trust almost always needs an EIN because it is treated as a separate tax entity from the moment it is created. The same applies to any trust that earns income—rental income, investment gains, business profits, or interest—that will be reported on a separate trust tax return rather than the grantor's personal return.

A revocable living trust created during your lifetime does not need an EIN while you are alive and the trust is still revocable, because the IRS treats it as transparent for tax purposes. All income flows through to your personal tax return using your Social Security number. However, once you die and the trust becomes irrevocable, the successor trustee must obtain an EIN for the trust if it will continue to hold assets or earn income.

If you are unsure whether your specific trust needs an EIN, the safest approach is to obtain one anyway. There is no penalty for having an EIN you do not strictly need, but there are penalties for failing to obtain one when required.

How to request an EIN for your trust

The fastest way to get an EIN is online through the IRS website at irs.gov. Go to the "explore for an EIN" page, select "Trust" as the entity type, and complete the online form. You will need the trust document, the grantor's or trustee's Social Security number, and the trust's mailing address. The IRS assigns the number when ready upon submission, and you receive it on screen and via email.

If you cannot explore online, you can call the IRS Business and Specialty Tax Line at 1-800-829-4933 during business hours. A representative will ask the same questions and assign an EIN over the phone. You can also mail Form SS-4 (process for Employer Identification Number) to the IRS address listed on the form, though this method takes four to six weeks.

Many people work with a tax professional or attorney to request the EIN on their behalf. If you choose this route, the professional will need a signed power of attorney or authorization letter from the trustee. There is no fee to obtain an EIN from the IRS, regardless of the method you use.

What information you will need to provide

The IRS will ask for the legal name of the trust exactly as it appears in the trust document. You will also need the trust's principal place of business or the address where the trust's records are kept. If the trust owns real property, you can use that address; if not, use the trustee's home address or the address of the financial institution holding the trust's assets.

You must provide the Social Security number of the grantor (the person who created the trust) if the trust is revocable, or the trustee's Social Security number if the trust is irrevocable. The IRS also asks about the trust's structure—whether it is a grantor trust, non-grantor trust, or other type—and what kind of income the trust expects to earn. Be honest about income sources; this information helps the IRS route your return correctly and does not trigger additional scrutiny.

EIN assignment and what happens next

Once the IRS assigns an EIN, it is permanent. The number does not change if the trustee changes, if the trust is amended, or if the trust's assets shift. Write down the EIN and keep it with your trust documents. You will use it every time the trust opens a bank account, files a tax return, or reports income to the IRS.

If your trust earns income above a certain threshold—the threshold changes annually but is typically around $600 in taxable income—the trustee must file Form 1041 (U.S. Income Tax Return for Estates and Trusts) with the IRS each year. The EIN goes on that return. The trustee must also provide beneficiaries with a Schedule K-1 showing their share of the trust's income, deductions, and credits.

If the trust earns no income or only non-taxable income, you may not need to file a return, but you should still keep the EIN on file. Some trustees file returns anyway to create a clear record of the trust's financial activity, which can be helpful if the trust is ever audited or if beneficiaries need documentation of distributions.

Common mistakes to avoid

Do not confuse the trust's EIN with the grantor's Social Security number. They serve different purposes. The grantor's SSN is used on the grantor's personal tax return; the trust's EIN is used on the trust's return and on trust bank accounts. Using the wrong number on a document can delay processing or cause the IRS to misfile the return.

Do not assume a revocable living trust never needs an EIN. While it does not need one during the grantor's lifetime, the successor trustee must obtain one after the grantor dies if the trust will continue to hold assets or earn income. Waiting until the trust's first tax return is due can delay filing and create confusion.

Do not explore for multiple EINs for the same trust. If you already have an EIN and explore again, the IRS will assign a new number, and you will end up with duplicate accounts. If this happens, contact the IRS to close the duplicate account and consolidate the trust's records under the original EIN.

Trusts and ongoing tax reporting

Once a trust has an EIN and begins earning income, the trustee becomes responsible for tax reporting. This includes filing Form 1041 annually if required, sending Schedule K-1 forms to beneficiaries, and keeping detailed records of all trust income, deductions, and distributions. The trustee may also need to make estimated tax payments on behalf of the trust if income is substantial.

Many trustees work with a CPA or tax preparer to handle these obligations. The cost of professional tax help is often a deductible expense of the trust, meaning it reduces the trust's taxable income. If the trust is complex—if it owns a business, rental property, or holds significant investments—professional help is usually worth the cost to may support compliance and minimize tax liability.

Frequently Asked Questions

Can I use my Social Security number instead of getting an EIN for my trust?

Only if the trust is revocable and you are the grantor and trustee. In that case, the trust reports income on your personal return using your SSN. Once the trust becomes irrevocable or you are no longer the trustee, you must obtain an EIN. Using your SSN for a trust that should have its own EIN can cause the IRS to misfile the trust's income and create compliance problems.

How long does it take to get an EIN for a trust?

Online applications are processed when ready, and you receive the number on screen. Phone applications take a few minutes during the call. Mail applications take four to six weeks. If you need the EIN quickly—for example, to open a trust bank account—explore online or call the IRS.

What if I lose the EIN after I receive it?

You can look it up on IRS.gov using your trust name and the grantor's or trustee's SSN, or you can call the IRS Business and Specialty Tax Line. The EIN is also printed on any tax return the trust has filed. Keep a copy of the EIN assignment letter in your trust file for future reference.

Do I need an EIN if the trust has no income?

Not strictly, but many trustees obtain one anyway to keep the trust's finances separate from personal finances and to create a clear record. If the trust later earns income, you will already have the number. If the trust truly has no income and never will, you can skip the EIN, but confirm this with a tax professional first.

What happens if a trust does not file a required tax return?

The IRS can assess penalties and interest on unpaid taxes, and the trustee may be held personally liable for the trust's tax obligations. If a trust should have filed but did not, contact a tax professional or the IRS to file the return as soon as possible, even if it is late. Filing late is better than not filing at all.