How to Find Your State's DBA Filing Requirements

Step 1: Identify Which Agency Actually Handles DBAs in Your State

Start with your state's Secretary of State (or equivalent) business filings page and search for "DBA," "trade name," "fictitious name," or "assumed name," since states use different terms for the same filing. Most states handle DBAs through this office, but not all; Washington routes trade name registration through its Department of Revenue, as part of the standard Business License Application, rather than through its Secretary of State. If the Secretary of State's page doesn't mention DBAs, check whether a different state agency handles business licensing generally, since that's often where the requirement lives instead.

Step 2: Check Whether Your State Files at the County or City Level Instead

A meaningful number of states don't maintain one statewide DBA database at all. Kansas has no statewide DBA registry; trade names are handled at the county or city level, according to the Kansas Secretary of State. Nevada routes DBA filings to the county clerk in each county where a business operates, not to the Secretary of State. California requires a Fictitious Business Name Statement filed with the county clerk-recorder in the county of the business's principal place of business. If your state works this way, your state's own business filings page usually says so directly and points you to your specific county or city's clerk instead.

Step 3: Watch for States That Use an Unusual Agency

Beyond the Secretary of State and county clerks, a few states route DBAs somewhere less obvious. Delaware's trade name registration moved to the Division of Revenue, through the Delaware One Stop portal, as a statewide registry effective February 2, 2026, after previously running through county Superior Court Prothonotaries. Massachusetts routes its "Business Certificate" filing through the city or town clerk in the municipality where the business is located, rather than a state-level agency at all. These exceptions are exactly why it's worth confirming the specific agency for your state rather than assuming every state works the same way.

Step 4: Find the Specific Form and Current Fee

Once you've identified the right agency, look for the specific form name, such as a "Certificate of Assumed Name" or "Trade Name Registration," and its current filing fee on that agency's own page. Fees change periodically; Delaware's trade name fee, for example, stayed at $25 through its 2026 move to a statewide registry, but other states adjust fees from year to year, so a number from an older source may no longer be current.

Step 5: Check for a Publication Requirement

Some states require publishing notice of the new DBA in a local newspaper before or after filing, which is easy to miss if you only read the application form itself. Florida requires advertising the name once in a newspaper in the county of the business's principal place of business before filing, according to the Florida Department of State. Search the filing agency's FAQ page, not just the form, for this kind of requirement, since it's often explained separately from the application itself.

Step 6: Confirm the Renewal Term Before You File

Finally, check how long the DBA lasts and what renewing it costs, since this varies widely: some states require renewal every two, three, or five years, and some, like Rhode Island, don't require renewal at all. Knowing this upfront helps you calendar the right reminder instead of discovering a lapsed registration later.

Bookmark the Official Page, Not a Summary

Third-party summaries, including this one, are useful for understanding the general process, but fees, forms, and requirements change. Bookmark the actual state or county agency's page you'll file through, and check it again close to your filing date.

If You Operate in More Than One State

If your business operates in more than one state, research each state's requirements separately rather than assuming one state's process applies elsewhere; a DBA filed in your home state generally isn't recognized in a state where you're separately registered as a foreign entity.

When the Agency's Website Doesn't Have a Clear Answer

If a state or county's page doesn't clearly answer a specific question, such as whether publication is required or what the current fee is, most filing agencies list a phone number or email for business filings; a short call can save you from filing an incomplete or outdated application.

Not Legal Advice

This guide describes a general research process; it isn't a substitute for reading your specific state's current statute or agency instructions. Talk to a business attorney if your situation involves more than a standard, single-state DBA filing.