A charter number for an LLC is the unique identification code your state’s filing office assigns to your company when it approves your formation paperwork. The number is generated automatically, with no separate application and no extra fee, and it appears on the stamped or certified copy of your Articles of Organization that the state sends back. It stays with the business for its lifetime.
What Your State Might Call It Instead
Only a few states actually use the words “charter number.” Maine is one. Most states label the same thing differently. Florida calls it a “document number.” California uses “entity number.” You’ll also see “file number,” “control number,” “business ID,” and “registration number,” all pointing to the same record.
So if a bank, vendor, or government form asks for your charter number and your state calls it something else, you’re looking for the same thing. Any multi-digit number stamped or printed by the state on your formation document is it.
Where to Find Your Charter Number
The fastest place to look is the stamped copy of your Articles of Organization (or Certificate of Formation) that the state returned after approving your filing. The number is typically printed or stamped near the top of the document, often next to or above the filing date.
If you’ve lost that document or never received a paper copy, every state runs a free online business entity search through its Secretary of State website or equivalent portal. Search by your LLC’s exact legal name, and the charter number (whatever the state calls it) will appear in the entity details along with your formation date, status, and registered agent. This information is public.
You can also call or email the Secretary of State’s office and ask for it. Certified copies of formation documents may cost a small fee, but a simple lookup is free in every state.
Charter Number vs. EIN
These get confused constantly, and mixing them up on forms delays tax filings and bank account openings. They are two different numbers issued by two different authorities.
- Charter number. Issued by your state’s Secretary of State (or equivalent office) when you form the LLC. It identifies your business in state records and is used for state-level filings like annual reports and amendments.
- EIN. Issued by the IRS. It identifies your business for federal tax purposes and is required if you have employees, file certain tax returns, or operate as a partnership or corporation for tax purposes.
One common misconception is that you need your charter number to apply for an EIN. Form SS-4 asks for your entity type, your legal name as it appears on your formation documents, and the Social Security number or taxpayer ID of the responsible party. There is no field for a state-issued charter or entity number.1Internal Revenue Service. Instructions for Form SS-4 (12/2025) The IRS does require you to form your LLC with the state before applying for an EIN, so you’ll have the charter number by that point whether the application asks for it or not.2Internal Revenue Service. Employer Identification Number
When You’ll Actually Use It
Your charter number comes up less often than your EIN in day-to-day business, but some situations require it specifically.
- Annual or biennial reports. Most states require LLCs to file periodic reports to keep registration active, and the charter number identifies which entity is filing.
- Amendments to formation documents. Changing your LLC’s name, adjusting members listed in the articles, or switching registered agents means filing an amendment tied to the charter number.
- Opening a business bank account. Banks typically ask for your Articles of Organization or Certificate of Formation, which carry the charter number, along with your EIN.3U.S. Small Business Administration. Open a Business Bank Account
- Good standing certificates. When you need to prove your LLC is current on filings and fees, the state issues a certificate of good standing tied to the charter number.
- Foreign registration. When you expand into another state, you’ll file for foreign LLC registration there and receive a separate entity number from that state’s filing office.
LLCs Registered in More Than One State
When your LLC operates in a state other than where it was formed, you typically register as a foreign LLC in that additional state. Each state assigns its own entity number on approval. An LLC formed in one state and registered in three others ends up with four different state-issued identification numbers, one per state.
Keep a record of every state-issued number alongside the state it belongs to. Using the wrong state’s number on a filing causes rejections and delays, especially during tax season when you may be filing across jurisdictions.
What Happens If You Ignore State Filings
The charter number itself doesn’t expire, but the LLC registration behind it can lapse. Miss annual or biennial report deadlines or skip required fees, and most states will impose late penalties and eventually move the LLC to “inactive” or “administratively dissolved” status. The number still exists in state records at that point, but it’s attached to an entity that has lost its legal protections.
Reinstatement is available in most states, and a reinstated LLC generally keeps its original charter number. Fees run higher than the original filing would have, and the gap in active status can create liability exposure for members. The charter number is the thread connecting your original formation to any future reinstatement, which is one more reason to keep it on file somewhere you can find it.