No, an entity number is not the same as an EIN. An Employer Identification Number is a nine-digit federal tax ID issued by the IRS, while an entity number is the registration ID your state’s Secretary of State assigns when you file your formation documents. They come from different levels of government and do different jobs, and most formally registered businesses end up with both.
What Each Number Is
An EIN is assigned by the IRS to businesses and other organizations for federal tax filing and reporting. It functions as a Social Security Number for your business. The IRS issues EINs to employers, sole proprietors, corporations, partnerships, LLCs, estates, trusts, tax-exempt organizations, and retirement plans.1Internal Revenue Service. Employer Identification Number You need one if you have employees, operate as a partnership or corporation, or file employment or excise taxes. A single-member LLC taxed as a disregarded entity can often use the owner’s SSN instead, but a single-member LLC that elects corporate taxation still needs its own EIN.
An entity number is what your state assigns when it approves your Articles of Incorporation or Articles of Organization. Depending on the state, the same identifier may be called a file number, charter number, or registration number. There’s no national standard for the label or the format, but the function is consistent: it identifies your business within that state’s records. The number appears on the stamped copies of your formation documents and in the state’s online business search, and the state uses it to track whether you’ve filed your annual or biennial reports and remain in good standing.
One key contrast: the entity number has no federal tax purpose. It exists so the state can confirm your business is legally recognized within its borders and current on its obligations.
Where Each Number Belongs
The two numbers show up on different paperwork, and using the wrong one can stall a filing or create compliance headaches.
Your EIN belongs on federal tax documents: income tax returns (Form 1120 for corporations, Form 1065 for partnerships), quarterly payroll filings like Form 941, W-2s issued to employees, and 1099s issued to contractors.2Internal Revenue Service. Instructions for Form 941 Banks require it to open a business account, and lenders use it for federal loan reporting.
Your state entity number belongs on state-level filings: annual reports, franchise tax returns, statements of information, and applications to register your business to operate in another state (foreign qualification).
The Uniform Commercial Code financing statement, used to record security interests in business assets, is a clean illustration. The form has separate fields for the debtor’s tax ID (your EIN or SSN) and the organizational ID (your state-assigned entity number). They sit side by side on the form because they are distinct identifiers with distinct jobs.3OAS.org. Instructions for National UCC Financing Statement (Form UCC1)
One Can Lapse While the Other Stays Active
The two identifiers are independent, and their status can drift apart. If you skip your state’s annual report, the state can suspend or revoke your entity number and knock the business out of good standing, but your EIN with the IRS is unaffected and remains valid. The reverse timing shows up when a business is new: your state entity number is issued the moment your formation documents are approved, but your EIN may take a few days to arrive if you applied by mail rather than through the IRS online tool.
An EIN, once assigned, is permanent. The IRS never reissues it or gives the same number to a different entity, and a business should have only one.1Internal Revenue Service. Employer Identification Number A name change or address change alone does not require a new EIN. Structural changes (incorporating a sole proprietorship, dissolving and reforming, or certain mergers) can trigger a new one under IRS rules that vary by entity type.4Internal Revenue Service. When to Get a New EIN State entity numbers, by contrast, are tied to the specific entity on file with that specific state; dissolve the entity or withdraw from the state and the number is deactivated.
How to Find Each Number
If you’ve lost track of either identifier, both are recoverable.
Your EIN appears on the IRS confirmation notice (CP 575) sent when it was first issued. If that letter is gone, the number is also on any prior federal tax return your business has filed and on file with your business bank. As a last resort, call the IRS Business and Specialty Tax Line at 800-829-4933, Monday through Friday, 7:00 a.m. to 7:00 p.m. local time; after identity verification, an agent will provide the number by phone.1Internal Revenue Service. Employer Identification Number
Your state entity number is on the stamped formation documents the Secretary of State returned to you, on any annual report or statement of information you’ve filed, and in the state’s online business search. Nearly every state offers a free lookup where you can pull up your business by name and see the entity number, standing, and registered agent.
Applying for an EIN if You Don’t Have One
The IRS issues EINs at no cost. The online application at irs.gov is the fastest route and returns your number immediately once approved. It’s available Monday through Friday from 6:00 a.m. to 1:00 a.m. Eastern, Saturday from 6:00 a.m. to 9:00 p.m., and Sunday from 6:00 p.m. to midnight.5Internal Revenue Service. Get an Employer Identification Number To use the online tool, your principal place of business must be in the United States or a U.S. territory, and you’ll need the responsible party’s SSN or ITIN. Businesses based outside the U.S. apply by phone, fax, or mail using Form SS-4.6Internal Revenue Service. Instructions for Form SS-4 (12/2025) The IRS never charges a fee; any site that asks for one is a third-party service, not the IRS.
Other Business ID Numbers That Get Confused With These
A few other identifiers routinely get mistaken for an EIN or an entity number when onboarding forms ask vaguely for a “business number.” None of them are the same as either.
A state tax ID is separate from both the EIN and the state entity number. It’s issued by your state’s department of revenue or taxation (not the Secretary of State) and is used for state income tax withholding, sales tax collection, or unemployment insurance.7U.S. Small Business Administration. Get Federal and State Tax ID Numbers
A Unique Entity ID (UEI) is assigned through SAM.gov to businesses that work with the federal government. It replaced the older DUNS Number and is used across federal award systems.8U.S. General Services Administration. Unique Entity ID is Here It has no connection to your EIN or state entity number.
Cities and counties often issue local business license numbers for tax or zoning purposes, and regulated industries (insurance, finance) may receive separate IDs from a state department of financial services. These don’t overlap with the EIN or the state entity number either.
One boundary point worth flagging on the FinCEN Beneficial Ownership ID: as of March 2025, FinCEN issued an interim final rule exempting all U.S.-formed companies from beneficial ownership reporting. Only entities formed under foreign law and registered to do business in a U.S. state or tribal jurisdiction still file. If you formed your LLC or corporation in a U.S. state, you currently have no BOI filing obligation, though FinCEN has said it intends to finalize the rule.9FinCEN.gov. FinCEN Removes Beneficial Ownership Reporting Requirements for U.S. Companies and U.S. Persons
When in doubt about which number a form wants, look at who is asking. Federal agencies and federal tax forms want the EIN. State agencies filing formation, compliance, or franchise tax paperwork want the state entity number. State tax authorities want your state tax ID. Match the identifier to the government office and the number will almost always sort itself out.