A California EIN lookup splits into two very different tasks. If you’re trying to find your own federal Employer Identification Number, the fastest route is calling the IRS Business and Specialty Tax Line at 800-829-4933, where a representative can verify your identity and give you the number over the phone. If you’re researching another business, the federal EIN is only publicly available for nonprofits (through IRS filings) and publicly traded companies (through SEC filings). California’s own business databases show a state entity number and status information, but the federal EIN doesn’t appear there.
Finding Your Own EIN
The IRS assigns each business a single EIN, and it never expires or gets reissued. Before calling anyone, check your own records. The original notice the IRS sent when you applied is the cleanest source. Past business tax returns carry the number. So does the paperwork from opening a business bank account, and state or local license applications often include it.
If those come up empty, call the IRS Business and Specialty Tax Line at 800-829-4933, open Monday through Friday from 7 a.m. to 7 p.m. local time (Alaska and Hawaii follow Pacific). After verifying your identity, a representative can read the number to you on the call or fax a 147C verification letter, which is the official confirmation document. Only someone authorized to act for the entity can make this request: a corporate officer, the sole proprietor, or a person holding a valid power of attorney.1Internal Revenue Service. Employer Identification Number
One common mix-up worth naming. Form SS-4 is the application you filed to request the EIN, not the confirmation you got back.2Internal Revenue Service. About Form SS-4, Application for Employer Identification Number (EIN) The IRS no longer returns a stamped SS-4 as proof of anything. When a bank, lender, or vendor asks for proof of your EIN, the 147C letter is what they mean.
Why the State’s Public Databases Won’t Show a Federal EIN
The California Secretary of State runs the bizfileOnline portal at bizfileonline.sos.ca.gov, where anyone can search for corporations, LLCs, and limited partnerships registered in the state.3California Secretary of State. bizfile Online Search Type in a business name or entity number, pick a filter, and the system returns matching records.
Clicking through gets you the entity’s current status (active, dissolved, suspended, and so on), its formation or registration date, the state entity number, the registered agent, and PDF copies of filed documents. The Statement of Information filings list officers, directors, or managers, plus business and agent addresses. LLC filings add a short description of the business and the chief executive officer, if there is one.
What you will not find is a federal EIN. The Secretary of State doesn’t collect or display it. For a private California business that isn’t a nonprofit or publicly traded, the federal EIN simply isn’t in any public state database. Your options are to ask the business directly or look at a document where they’ve disclosed it voluntarily, such as a W-9 they provided in a business transaction.
The California Numbers People Confuse With an EIN
California assigns several of its own identifiers, and callers frequently mean one of these when they say “California EIN.” They are separate systems run by different agencies.
- The Secretary of State entity number is assigned when you register a corporation, LLC, or limited partnership. It appears in bizfileOnline results and on every filing you make with that office. It isn’t a tax number.
- The State Employer Identification Number (SEIN) is the eight-digit number the Employment Development Department issues when you register as an employer for California payroll taxes. You use it for wage reporting, unemployment insurance, and state disability insurance, and you can manage it through the EDD’s e-Services for Business.4Employment Development Department. e-Services for Business
- The Franchise Tax Board entity number tracks the business for state income and franchise tax purposes. You’ll find it on any FTB correspondence or on your California tax returns.
When someone asks for your California EIN, ask which number they need. Payroll processors want the SEIN. The Secretary of State needs the entity file number. Your federal EIN goes on IRS filings and is what most banks, vendors, and the IRS itself require.
Looking Up a Nonprofit’s EIN
Nonprofits are the cleanest public exception. Tax-exempt organizations file annual Form 990 information returns with the IRS, and those returns are public. Each 990 shows the organization’s EIN, its financial data, officer compensation, and details about programs.
The IRS Tax Exempt Organization Search tool (TEOS) lets you search by name or EIN, view an organization’s exempt status, and pull filed returns. It also includes the automatic revocation list, showing names, EINs, and effective dates for organizations that lost tax-exempt status after failing to file for three consecutive years.5Internal Revenue Service. Search for Tax Exempt Organizations
Third-party platforms such as GuideStar (now part of Candid) aggregate 990 filings with additional context like program descriptions and financial ratios. The IRS TEOS tool is the authoritative source, and it’s free.
Looking Up a Public Company’s EIN
Companies that sell securities to the public file periodic reports with the SEC, and those filings show the EIN on the cover page. The Form 10-K template specifically requires the IRS Employer Identification Number.6U.S. Securities and Exchange Commission. Form 10-K
Use the SEC’s EDGAR search to pull it. Look up the company by name or ticker, open the most recent 10-K or 10-Q, and the EIN sits on the first or second page.7U.S. Securities and Exchange Commission. EDGAR Full Text Search This works for any publicly traded company, not just California-based ones.
Verifying a Private California Business When the EIN Isn’t Available
Most of the time, when someone tries to look up another business’s EIN, what they actually need is to confirm the company is real and operating legitimately. Two free California tools handle that without the EIN.
The bizfileOnline portal, described above, tells you whether the entity is registered, when it was formed, who the registered agent is, and what its current status is with the Secretary of State.
The Franchise Tax Board’s Self Serve Entity Status Letter, at webapp.ftb.ca.gov/eletter, tells you whether a corporation or LLC is in good standing, suspended, or has had its powers forfeited for failure to file returns or pay taxes.8Franchise Tax Board. Self Serve Entity Status Letter Partnerships are not included. A company whose powers have been suspended can’t enforce contracts, maintain lawsuits, or defend itself in court until it clears up its tax obligations, so this check is worth running before signing anything significant.
Neither tool displays an EIN. Together they answer the practical question behind most private-company lookups: is this business real, and is it currently authorized to operate in California? If you genuinely need the federal EIN itself (for issuing a 1099, for example), request a completed Form W-9 from the business directly. That is the standard way federal tax identification numbers move between private parties, and it puts the responsibility for accuracy on the business providing the number.