Contractors often ask for a “California business ID” as though one number opens every account. It does not. Start with the transaction or agency asking for the number, then provide or obtain the identifier that belongs to that system.
Secretary of State entity record
A corporation or LLC files formation documents through the California Secretary of State. The resulting entity record is used to identify that legal entity in the state's business registry. A sole proprietorship does not file a formation document with the Secretary of State, according to the state's entity guidance.
Keep a formed entity's public record current through the applicable Statement of Information. The Secretary of State warns that failure to file can result in penalties and suspension or forfeiture.
Federal employer identification number
The Secretary of State's startup sequence identifies federal and state tax ID steps after business formation. A federal EIN is issued through the federal tax system. It is not a California Secretary of State entity number and not a CSLB contractor license number.
CDTFA permits and accounts
The California Department of Tax and Fee Administration administers multiple permits, licenses, and tax or fee accounts. Which one applies depends on the business activity.
CDTFA states that a seller's permit is required when a person is engaged in business in California and intends to sell or lease taxable tangible personal property at retail. Online registration is free, and an issued seller's permit must be displayed prominently at the place of business.
CSLB contractor license number
The Contractors State License Board issues the license number tied to the licensed contractor entity. Customers use it to verify the business, classifications, bond, workers' compensation information, and status. It does not replace an entity or tax identifier.
Local business and permit numbers
Cities and counties can issue their own business-license, tax-certificate, fictitious-name, and project-permit numbers. Those records are local. A state entity number or CSLB license does not automatically satisfy them.
How to identify the number you need
- Write down the exact agency or form requesting the number.
- Determine whether it is asking for the legal entity, federal taxpayer, California tax account, contractor license, or local permit.
- Use the legal business name consistently when registering.
- Save the confirmation notice and record the issuing agency beside the number.
- Do not publish tax identifiers that are not intended for public display.
- Track return and renewal dates for each account separately.
Seller's permit maintenance
CDTFA says permits and licenses are generally not transferable to a new owner. A change in ownership or business structure may require closing an existing account and registering the new business. Use CDTFA's current guidance before selling, buying, or converting the company.
Once registered, follow the filing frequency assigned to the account. CDTFA maintains a separate sales and use tax filing-date page; do not assume every account has the same return schedule.
Frequently asked questions
Is the California entity number the same as an EIN?
No. They come from different government systems and serve different purposes.
Does every contractor need a seller's permit?
Not solely because the business is a contractor. CDTFA ties the permit to taxable retail sales or leases and other account-specific activities. Confirm the company's actual transactions.
Can I transfer a seller's permit when buying a company?
CDTFA says permits and licenses are generally not transferable. Confirm closure and new-registration steps before the ownership change.
This page is general operational information, not tax or legal advice. Account requirements depend on business structure and transactions. Confirm them with the issuing agency or a California tax professional.