Do You Have to Register a DBA in California? When and How to File

Yes, in most cases you have to register a DBA in California. If your business operates under any name that isn’t the owner’s legal personal name or the exact entity name on file with the Secretary of State, California requires you to file a Fictitious Business Name (FBN) statement with your county clerk within 40 days of starting to use that name, and then publish the filing in a local newspaper within 45 days.¹ Skip either step and you lose the right to sue on contracts made under that name until you fix it.

When You Actually Need to File

Whether you need to register comes down to whether the name you use in the market matches your legal identity on paper. The rules break down by business structure under Section 17900 of the Business and Professions Code.²

Sole proprietors have to file if the business name doesn’t include the owner’s surname, or if it suggests there are other owners. So “Premier Consulting” run by Jane Torres needs an FBN. “Torres Consulting” doesn’t. Add words like “Associates,” “and Company,” or “and Sons” to your surname and you’re back to needing one, because those additions imply other people are involved.

Partnerships need to include the surname of every general partner in the business name. Leave one out, or use language that hints at unnamed owners, and you have to file.

Corporations, LLCs, and limited partnerships need an FBN any time they do business under a name that isn’t the exact legal name registered with the Secretary of State. If Acme Holdings LLC operates a storefront called Coastal Real Estate, Coastal Real Estate needs its own FBN filing.

One restriction to know: your fictitious name can’t contain “Corporation,” “Inc.,” “LLC,” or similar entity designators unless your business genuinely is that type of entity. County clerks are required to reject filings that break this rule.³

How and Where to File

You file with the county clerk in the county where your principal place of business sits. If you don’t have a physical California location, you file in Sacramento County.² There’s no statewide registry. Everything is county-level.

The 40-day clock starts the day you begin using the name in business.² In practice you’ll want to file earlier than that, because most banks won’t open a business account under a trade name without a certified copy of your filed statement.

The form itself, set out in Section 17913, asks for:⁴

The fictitious name or names (multiple names can go on one statement only if they share the same address and ownership)
The physical street address of your principal place of business in California — P.O. boxes and mail service addresses aren’t accepted
Full legal name and mailing address of every registrant; for partnerships, all general partners; for corporations and LLCs, exactly as filed with the Secretary of State
Business type (sole proprietorship, partnership, corporation, LLC, trust, etc.)
The date you first began using the name
A signed declaration that the information is true, with the warning that a knowingly false filing is a misdemeanor

Fees vary by county. Los Angeles County charges $26 for one name and one registrant, with $5 for each additional name or registrant.⁵ Alameda County charges $40 for one name and one owner, plus $7 for each addition.⁶ Most counties land somewhere between $26 and $75 depending on how many names and owners you list.

The Newspaper Publication Step

Filing is only half of it. California law requires you to publish the FBN in an adjudicated newspaper of general circulation in the county where you filed. The first publication has to run within 45 days of your filing date, and there are no extensions.¹ Miss it and the entire filing becomes ineffective.

The notice runs once a week for four consecutive weeks. What appears in the paper has to match your filed statement exactly. Prices vary a lot; a small adjudicated paper in your county can be substantially cheaper than a large daily, so it pays to call around.

After the four-week run, the newspaper sends you an affidavit of publication. You then have 45 days to file that affidavit with the same county clerk.¹ This is where people slip up. The paper does its part, mails you the affidavit, and it sits on a desk. If it never gets back to the clerk, your FBN is treated as invalid.

What Happens If You Don’t Register

The biggest consequence isn’t a fine. It’s losing the courthouse door. Under Section 17918, a business operating under an unregistered fictitious name cannot maintain any lawsuit on a contract or transaction conducted under that name.² If a client refuses to pay a $50,000 invoice, you can’t sue to collect until you complete every step: filing, publication, and proof of publication. Your right to sue isn’t gone forever, but it’s frozen until you’re in compliance.

Knowingly filing a false statement is a separate matter. It’s a misdemeanor and carries a fine of up to $1,000.² Innocent errors aren’t the target here; deliberate use of fake addresses or fabricated owners is.

Renewal, Changes, and Abandonment

An FBN statement is good for five years from the filing date.⁷ Put the date on your calendar, because the statement simply expires if you don’t renew. If the information hasn’t changed and you file a new statement before the deadline, you don’t have to redo the newspaper publication.⁸

Any change to the facts on the statement triggers something different. New owners, a different business structure, or a new principal address cause the existing statement to expire 40 days after the change.⁷ You have that 40-day window to file a new statement, and the new statement has to go through the full publication cycle. Changing the fictitious name itself also requires a completely new filing and publication.

When you stop using a fictitious name, file a Statement of Abandonment with the same county clerk. The statute requires it, not just recommends it.² The abandonment lists the name being dropped, the address, the original filing date and file number, and registrant details. It also has to be published once a week for four weeks, with the affidavit filed afterward. If your original statement covered multiple names, you can abandon one without affecting the others.

A DBA Filing Doesn’t Protect Your Business Name

This is the piece that surprises new owners. An FBN is a public notice document, not a claim of ownership. Filing one gives you no exclusive rights to the name. Another business in your county, or anywhere else in California, can file the exact same fictitious name and operate legally next to you. The county clerk doesn’t screen for conflicts the way the Secretary of State does with corporate names.

If protecting the name matters, that’s a trademark issue, not a DBA issue. Common-law trademark rights arise from using a name in commerce, but they’re limited to the area where you actually operate. A federal trademark registered with the U.S. Patent and Trademark Office provides nationwide protection and legal standing to stop others from using a confusingly similar name for similar goods or services. Treat the FBN filing as compliance, and treat trademark registration as the separate step for protecting the brand.

1
California Legislative Information. California Code BPC 17917 – Fictitious Business Names
2
Justia Law. California Code BPC 17900-17930 – Fictitious Business Names
3
California Legislative Information. California Code BPC 17910.5 – Fictitious Business Names
4
California Legislative Information. California Code BPC 17913 – Fictitious Business Names
5
LA County Registrar-Recorder/County Clerk. Fictitious Business Name Fees
6
Alameda County Clerk-Recorder. Fictitious Business Name Filing Fees
7
California Legislative Information. California Code BPC 17920 – Fictitious Business Names
8
Solano County. Fictitious Business Name