A DBA (doing business as) is a filing that lets a person or company operate under a name other than its legal name. Depending on the state, it may be called an assumed name, fictitious business name or trade name. It doesn't create a separate legal entity.
Also called: Doing business as, Assumed name, Fictitious business name, Trade name
A DBA puts a business name on the public record next to the person or company that owns it. That lets you use the name on your truck, website, estimates and invoices, and it lets customers look up who they're actually hiring.
Example: Dana works alone as a sole proprietor and wants her van and invoices to say "Clear Path Drain Service." Without a DBA, her business name is her own name. With one, she can advertise and bill as Clear Path Drain Service, but the business is still her: same taxes, same personal responsibility for its debts. The names are made up for illustration.
A DBA is only a name filing. It doesn't:
Where you file depends on your state, and sometimes on your county or city. Start with your secretary of state's office; if DBAs are filed locally where you are, it can point you to the right office. Ask two more questions when you file: whether the filing has to be renewed, and whether you must publish a notice in a local newspaper, because some places require one or both. If your state files DBAs by county and you work in several counties, ask whether you need a filing in each.
If your trade needs a license, ask your licensing board how a trade name must appear on the license and in your advertising before you letter a truck. Then match the name across your bank account, insurance certificates, W-9s, estimates, invoices, website and Google Business Profile. Ask your bank what it needs to open an account in the trade name, and bring your filed DBA. Commercial customers may compare these documents when they set you up as a vendor, and a mismatch can hold up payment.
If you change the name later, update every one of them at the same time, starting with the license.