Can You Have More Than One EIN Number? IRS Rules and Limits

Yes, you can have more than one EIN. The IRS assigns an Employer Identification Number to a business entity, not to a person, so a single individual can be the responsible party on as many EINs as they have separate entities. Two LLCs, a trust you serve as trustee for, and an estate you’re administering could easily leave you associated with four active EINs at once. What you cannot do is get two EINs for the same entity: each entity is limited to one.¹

Why One Person Ends Up With Multiple EINs

The rule that trips people up is really two rules pointing in different directions. One entity gets one EIN. One person can be tied to many entities. Put those together and stacking EINs is normal, not an exception.

A retail store organized as an LLC and a consulting firm organized as a separate LLC each need their own EIN because each files its own return. The retail LLC might file Form 1065 as a partnership while the consulting LLC files Form 1120 as a corporation, depending on how each elected to be taxed.² Keeping the identifiers separate preserves the legal protection each entity provides and prevents the IRS from tangling one business’s obligations with another’s.

Estates and trusts add more EINs to the pile. When someone dies, the estate typically needs its own EIN to handle income earned during probate and to settle debts. An irrevocable trust needs one to report income generated by trust assets on Form 1041. Household employers who hire a nanny or housekeeper need an EIN for employment tax reporting, though if you already have one from a business you can sometimes use that same number for your household employees.³

If you accidentally end up with two EINs for the same entity, call the Business and Specialty Tax Line at 800-829-4933 so the IRS can tell you which one is the one of record. Duplicates for a single entity create filing confusion and trigger notices.¹

When You Need Another EIN

The IRS requires a new EIN whenever the fundamental legal identity of an entity changes. The rules differ by starting entity type.⁴

Sole Proprietors

You need a new EIN if you incorporate, form a partnership, or declare bankruptcy. Each of those creates a new tax-paying entity the IRS tracks separately from your old sole proprietorship.⁴

Corporations

A corporation needs a new EIN when it receives a new charter from a secretary of state, creates a subsidiary, converts to a partnership or sole proprietorship, or merges with another corporation to form a new entity.⁴

Partnerships

Partnerships need a new EIN when they incorporate, when one partner takes over and operates as a sole proprietor, or when the partnership ends and a new one begins.⁴

Buying an Existing Business

Purchasing a business almost always means getting your own EIN. Using the previous owner’s number could link you to their unpaid taxes, unresolved audits, or improperly claimed credits.¹

Bankruptcy

When an individual files Chapter 7 or Chapter 11, the bankruptcy estate is treated as a separate taxable entity. The trustee or debtor-in-possession must obtain a new EIN for that estate and use it on all returns filed during the proceedings. The debtor’s Social Security number cannot substitute.⁵

When You Don’t Need Another EIN

This is where people waste time. Across every entity type, changing your business name or moving to a new location does not require a new EIN.⁴ Relocating to a different state keeps your existing number intact. A corporation reorganizing solely to change its identity or location keeps its EIN. A partnership that undergoes an ownership change without technically terminating keeps its EIN. Sole proprietors don’t need a new EIN just for opening a second location or operating in a different state.

If an entity changes its tax classification under the IRS check-the-box rules but keeps its legal form, it keeps its existing EIN. Federal regulations specifically state that any entity retains its EIN when its federal tax classification changes under those rules.⁶ The legal entity didn’t change; only its tax treatment did.

Single-Member LLCs: The Common Gray Area

Single-member LLCs get tripped up on EIN questions more than any other structure. When the IRS treats your LLC as a “disregarded entity” (meaning it ignores it for income tax purposes), you generally use your own Social Security number or existing EIN on income-related filings like a W-9. The LLC doesn’t file its own income tax return; income flows through to your personal return.⁷

Most single-member LLCs still end up needing their own EIN anyway. If the LLC has employees, it must use its own name and EIN for employment tax reporting and payments. Same for excise tax obligations. Even without employees, a single-member LLC may need an EIN to open a bank account or satisfy state requirements. Only a disregarded-entity LLC with no employees and no excise tax liability can skip getting one entirely.⁷

When a single-member LLC later changes classification and becomes recognized as a separate entity for federal tax purposes, it must use its existing EIN if it already has one. If it never obtained an EIN, it needs to apply at that point and stop using the owner’s number.⁶

The Daily Limit: One EIN Per Responsible Party Per Day

The IRS caps EIN issuance at one per responsible party per day, regardless of how you apply. If you need EINs for three new entities, plan on three separate days.⁸ For trusts, the limit applies per grantor. For estates, per decedent or debtor. So while there’s no lifetime cap on how many EINs you can hold, there is a pacing rule when you’re building a portfolio of entities.

How to Apply for an Additional EIN

Applying is free. The IRS states plainly: “You never have to pay a fee for an EIN.”⁹ Third-party sites that charge for the service are simply filling out the same form you can complete yourself.

The fastest route is the IRS online application, which issues your EIN immediately upon completion. The responsible party must have a valid Social Security number or ITIN to use the online tool, and you should download the confirmation notice right away because the IRS does not make it available for download later.⁹ If you can’t use the online tool, submit Form SS-4 by fax (roughly four business days) or mail (about four to five weeks). Applicants whose principal place of business is outside the United States cannot use the online tool and must call 267-941-1099 or submit the form by fax or mail.¹⁰

Before you start, have the entity’s legal name (matching what you filed with the state), the responsible party’s name and SSN or ITIN, the reason for applying, and a description of the business activity along with an estimate of the highest number of employees you expect over the next 12 months.⁸

Check Before You Apply Again

If you’re not sure whether an existing entity already has an EIN, look before you apply. Check the original IRS confirmation notice (CP 575), old bank records, prior business tax returns, or any state or local license applications where you listed the number.¹

If none of those turn it up, call the Business and Specialty Tax Line at 800-829-4933, Monday through Friday, 7:00 a.m. to 7:00 p.m. local time. After verifying your identity, they’ll give you the number over the phone. You can also request an EIN Verification Letter (Letter 147C), which the IRS can fax or mail as a replacement for the original CP 575.¹ Applying for a fresh EIN when the entity already has one is exactly the duplication the IRS wants you to avoid.

1
Internal Revenue Service. Employer Identification Number
2
Internal Revenue Service. LLC Filing as a Corporation or Partnership
3
Internal Revenue Service. Publication 926 (2026), Household Employer’s Tax Guide
4
Internal Revenue Service. When to Get a New EIN
5
Internal Revenue Service. Publication 908, Bankruptcy Tax Guide
6
eCFR. 26 CFR 301.6109-1 – Identifying Numbers
7
Internal Revenue Service. Single Member Limited Liability Companies
8
Internal Revenue Service. Instructions for Form SS-4 (Rev. December 2025)
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Internal Revenue Service. Get an Employer Identification Number
10
Internal Revenue Service. Instructions for Form SS-4 (12/2025)