How to File a DBA in Delaware (2026)

Fact-checked by the LegalGlass editorial team against primary sources · Published Aug 6, 2026 · Last updated Aug 6, 2026

Yes, a Delaware business using a name other than its owner's or entity's legal name must register a DBA. You file a Registration of Trade, Business and Fictitious Name Certificate with the Prothonotary of the Superior Court in each Delaware county where you operate, under Title 6 of the Delaware Code. A DBA is not a separate legal entity.

Quick Answer

What it is
A trade name (DBA / fictitious name) an owner or entity operates under
Document
Registration of Trade, Business and Fictitious Name Certificate
Where filed
Prothonotary, Superior Court, in each county of operation
Counties
New Castle, Kent, Sussex
Governing law
Title 6, Chapter 31 of the Delaware Code
Liability effect
None; a DBA gives no liability protection or trademark rights

What a DBA Is in Delaware

A DBA, short for "doing business as," is a trade name (also called a fictitious or assumed name) under which a person or company operates that differs from its own legal name. In Delaware, a sole proprietor named Jordan Lee who runs "Riverfront Coffee," or an LLC formed as "Blue Harbor Ventures LLC" that markets as "Blue Harbor Design," is using a DBA. The registration puts the public and creditors on notice of who actually stands behind the trade name. It does not, by itself, form a business or protect the owner's personal assets. For the national overview, see what is a DBA.

Delaware handles trade names differently from many states. Entity formation, such as an LLC or corporation, goes through the Delaware Division of Corporations, but a trade name registration is a county court filing made with the Prothonotary of the Superior Court. Under Title 6, Chapter 31 of the Delaware Code, a person or firm carrying on business under an assumed name must register that name in the county where the business is conducted.

Why bother with a trade name at all? The main reasons are practical rather than legal protection. A DBA lets a sole proprietor operate under a customer-facing brand instead of a personal name, which looks more professional on signage, invoices, and websites. It also lets a single owner or company run several distinct brands without forming a separate entity for each. And because most banks will not open an account in a trade name until the name is registered, filing the certificate is often the practical gateway to accepting checks and card payments under the brand. Registration also creates a public record connecting the trade name to the responsible owner, which is exactly what the notice statute is designed to accomplish.

Where and How to File a Delaware DBA

Filing a Delaware trade name is a county-level process. Follow these steps for each county in which you do business.

  1. Choose and check the trade name. Pick the name you will market under and make sure it is not deceptively similar to an existing business or a registered trademark. A DBA registration is for public notice and does not grant you exclusive rights to the name.
  2. Complete the certificate. Fill out the Registration of Trade, Business and Fictitious Name Certificate, listing the trade name, the owner's legal name, and the business address. The certificate is typically signed and notarized.
  3. File with the Prothonotary in each county. Submit the certificate to the Prothonotary of the Superior Court in every county where you transact business: New Castle, Kent, and/or Sussex. Pay the county filing fee. If you operate statewide, you register in all three counties.
  4. Handle taxes and licensing. Register with the Delaware Division of Revenue for a business license and any tax accounts, and obtain an EIN from the IRS if your business needs one.

Keep a stamped copy of each filed certificate. Banks and licensing offices often ask for proof of the trade name registration when you open an account or apply for a license under the DBA.

Filing Fee, Renewal, and Records

The Prothonotary charges a filing fee per county, set by the Superior Court, and because the filing is made in each county of operation, a statewide business pays the fee in each county where it registers. Fees are modest but change over time, so confirm the current amount with the Prothonotary of the relevant county before filing rather than relying on a figure that may be out of date. Unlike an annual entity report, a Delaware trade name certificate generally remains on file until the business stops using the name or the owner formally withdraws it.

Because the certificate is a public record, anyone can look up who is behind a Delaware trade name at the county Prothonotary. If your ownership or address changes, or you stop using the name, update or withdraw the registration so the public record stays accurate. Keeping the filing current matters for banking, contracts, and any dispute over who is liable for the trade name's obligations.

DBA vs. LLC, Trademark, and Liability

A DBA is often confused with forming a company or with owning a trademark, but the three are distinct. Registering a trade name does not create a separate legal entity and does not shield your personal assets. If a customer sues "Riverfront Coffee" and that is only a DBA of a sole proprietor, the owner is personally liable. To limit liability, you form an entity such as an LLC or corporation, which is a separate step from any DBA.

A DBA is also not a trademark. Trade name registration provides public notice within Delaware; it does not give you exclusive nationwide rights to the name. Trademark rights come from actual use in commerce and, for the strongest protection, from federal registration with the USPTO. Before adopting a trade name, it is wise to run a trademark search so you do not build a brand on a name someone else already owns. Many owners hold an LLC, a DBA under that LLC, and a federal trademark all at once, each doing a different job.

Delaware Business License and Taxes

Separate from the trade name filing, most businesses operating in Delaware must obtain a Delaware business license from the Delaware Division of Revenue and may owe the state's gross receipts tax depending on their activity. The business license and gross receipts registration are tied to the entity or owner, not to the DBA itself, so registering a trade name does not remove the need to license and register for taxes. If you have employees or operate as an entity, you also use your federal EIN for those registrations.

Local requirements can apply on top of the state license. Some municipalities require their own business licenses or permits, and regulated professions have additional licensing. Check both the Division of Revenue and your local government so the DBA, the state license, and any local permits are all in place before you begin operating. See business licenses and business tax for how these fit together.

A common sequence for a new Delaware venture looks like this: decide whether to operate as a sole proprietorship or form an entity; if forming an entity, file with the Division of Corporations; register any trade name with the county Prothonotary; obtain an EIN from the IRS; and then register for the state business license and gross receipts tax with the Division of Revenue. Doing the steps in that order keeps the names consistent across every record, so your bank, your customers, and the state all see the same trade name tied to the same owner. If you later stop using the DBA, withdraw it at the county level and update your license and tax accounts so nothing keeps running under a name you no longer use. Treat the trade name as one piece of a larger compliance picture rather than a substitute for entity formation, licensing, or trademark protection.

Frequently Asked Questions

Where do I file a DBA in Delaware?

You file a Registration of Trade, Business and Fictitious Name Certificate with the Prothonotary of the Superior Court in each Delaware county where you do business: New Castle, Kent, or Sussex. It is a county filing, not a Division of Corporations filing.

Does a Delaware DBA create a separate legal entity?

No. A DBA (trade name) is only an alternate name under which an existing person or entity operates. It provides no liability protection and does not create a corporation or LLC. For liability protection you must form an entity.

How much does a Delaware DBA cost?

The Prothonotary charges a filing fee per county, set by the Superior Court, and you file in each county where you operate. Confirm the current amount with the Prothonotary before filing, since fees can change.

Does an LLC need a DBA in Delaware?

Only if the LLC operates under a name different from its registered legal name. An LLC that uses its exact registered name needs no DBA, but one that markets under a different brand should register that trade name.

Is a DBA the same as a trademark?

No. A DBA registers the name for public notice; it does not grant exclusive rights. Trademark rights come from use and from federal registration with the USPTO. You can hold both, and a trademark search is wise before adopting a name.

Do I still need a Delaware business license with a DBA?

Yes, in most cases. A trade name registration is separate from the Delaware business license issued by the Division of Revenue. Most businesses operating in Delaware need that license regardless of whether they use a DBA.

Related

More Delaware business guides

Form An Llc In Business License In Dissolve An Llc In Annual Report Articles Of Organization Business Entity Search Get An Ein In Llc Tax Filing Operating Agreement Registered Agent

Sources

  1. Delaware Code - Title 6, Chapter 31, Trade Names (registration of assumed names).
  2. Delaware Code - Title 6, Chapter 31, Subchapter I (registration requirement).
  3. Delaware Courts - Superior Court (Prothonotary offices by county).
  4. Delaware Courts - Prothonotary (county filing office).
  5. Delaware Division of Revenue - Business Tax Forms (business license and gross receipts).
  6. Delaware Division of Revenue - Business Tax (registration overview).
  7. Delaware Division of Corporations - Registered Agents (entity formation, distinct from trade names).
  8. Delaware Division of Corporations - How to Form a New Business Entity.
  9. Delaware One Stop - Business First Steps (state business registration portal).
  10. IRS - Get an Employer Identification Number (free EIN).
  11. IRS - Business Name Change (name and EIN considerations).
  12. USPTO - Trademark Search (checking name availability).
  13. USPTO - Trademark Basics (rights differ from a DBA).
  14. Cornell Legal Information Institute - Trade Name (legal definition).
  15. Cornell Legal Information Institute - Doing Business As (DBA).
  16. Cornell Legal Information Institute - Trademark (rights and scope).

LegalGlass provides general information for educational purposes and is not a law firm or a substitute for advice from a licensed attorney or tax professional. Laws, fees, and procedures change; verify current requirements with the Delaware Superior Court Prothonotary and the Delaware Division of Revenue before acting.