Sole Proprietorship in Maryland (2026)

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

A Maryland sole proprietorship requires no state formation filing - you and the business are the same legal person, and you report profit on your personal return. You may register a trade name with SDAT (commonly $25), get a free EIN if you hire employees, and obtain any local and sales tax licenses your activity requires.

Quick Answer

Formation
No state filing to create a sole proprietorship
Liability
Unlimited - no separation between owner and business
Trade name (DBA)
Optional registration with SDAT (commonly $25)
EIN
Needed if you hire employees or file certain taxes
Income tax
Report on Schedule C plus 15.3% self-employment tax
Licenses
Sales/use tax license (free) and local licenses as applicable

What a Maryland Sole Proprietorship Is

A sole proprietorship is the simplest way to do business: one individual owns and runs it, and there is no legal separation between the owner and the business. In Maryland, you do not file anything with the state to create a sole proprietorship — you become one automatically when you start offering goods or services for profit. The tradeoff for that simplicity is the absence of a liability shield.

Because the owner and business are the same legal person, all business income is the owner's income, and all business debts are the owner's personal responsibility. Many Marylanders start as sole proprietors and later form an LLC when liability or growth becomes a concern. See the glossary for how a sole proprietorship compares to other structures.

Liability and Why Owners Convert to an LLC

The biggest limitation of a sole proprietorship is unlimited personal liability. If the business is sued or cannot pay its debts, your personal assets — home, car, savings — can be at risk, because there is no separate entity to absorb the liability. Business insurance helps but does not create the legal separation an entity provides.

For this reason, many Maryland owners form an LLC once they have meaningful revenue, assets, or risk. An LLC creates a separate legal person that generally shields the owner's personal assets, while still allowing pass-through taxation. If liability protection matters to you, compare a sole proprietorship with forming a Maryland LLC before you commit.

Registering a Trade Name (DBA) with SDAT

A sole proprietor operates under their own legal name by default. If you want to do business under a different name — a trade name or DBA — you register it with the Maryland Department of Assessments and Taxation (SDAT). The trade name registration commonly costs $25 and puts the public on notice of who is behind the name.

Registering a trade name does not create a separate legal entity or provide liability protection, and it does not give you trademark rights. If you want to protect a brand name, that is a separate trademark process. Banks often ask for a trade name registration to open an account under your business name. See what is a DBA and Maryland DBA filing.

Do You Need an EIN?

A Maryland sole proprietor with no employees can generally use their Social Security number for federal taxes and is not required to have an EIN. However, you must get a free federal EIN if you hire employees or file certain excise or employment tax returns, and many get one anyway to avoid sharing an SSN with clients and banks.

An EIN also helps establish business credit and is required if you later convert to an LLC taxed as a corporation. The EIN is free from the IRS and issued immediately online. Getting one is a low-risk step that keeps your personal SSN more private. See how to get an EIN for the process.

How a Maryland Sole Proprietor Is Taxed

A sole proprietor reports business income and expenses on Schedule C attached to their personal federal return, and the net profit flows to Maryland's individual income tax as well. On top of income tax, the owner owes self-employment tax of 15.3% (12.4% Social Security up to the annual wage base, plus 2.9% Medicare) on net earnings, reported on Schedule SE.

Because no employer withholds taxes for you, you generally must make quarterly estimated tax payments to both the IRS and Maryland to cover income and self-employment tax. Maryland's local (county) income taxes also apply. Keep good records of income and deductible expenses. See business tax and the self-employment tax calculator to estimate what you owe.

Maryland Licenses and Sales Tax

Even without a formation filing, a Maryland sole proprietor may need licenses. If you sell taxable goods, you must obtain a sales and use tax license from the Comptroller of Maryland (free) before making sales. Maryland also requires many retailers to hold a trader's license, obtained through the Circuit Court clerk in your county, with a fee based on inventory.

Depending on your activity and location, you may also need local and professional licenses. Research county and municipal requirements early, because operating without a required license can lead to penalties. See business license in Maryland and the general licensing guide to identify what applies to you.

Converting to an LLC Later

Many Maryland sole proprietors eventually convert to an LLC to gain liability protection and flexibility. To do so, you form an LLC by filing Articles of Organization with SDAT, transfer your business assets and accounts to the new entity, update your EIN or obtain a new one if required, and re-register any licenses under the LLC's name.

The conversion is a good moment to adopt an operating agreement and reassess your tax setup, including whether an S-corp election makes sense. Timing the switch when your revenue or risk grows lets you start simple and add structure when it is worth the added compliance. See how to form an LLC in Maryland.

Practical Steps to Set Up and Run the Business

Beyond the tax and license basics, a few practical steps keep a Maryland sole proprietorship running smoothly. Open a dedicated business bank account, even though the law does not require one, so your income and expenses are cleanly separated for tax time and for tracking profitability. Use it for every business transaction rather than mixing funds with personal accounts.

Keep organized records of income and deductible expenses throughout the year; as a sole proprietor you report everything on Schedule C, and good records maximize legitimate deductions and simplify your filing. Consider accounting software or a bookkeeper once your volume grows, and set aside money for taxes with each payment you receive, since no employer is withholding for you.

Adequate insurance is especially important for a sole proprietor, because there is no entity to absorb liability - general liability or professional liability coverage can protect your personal assets where the business structure does not. Review your coverage as the business changes.

Finally, revisit the structure periodically. Once revenue, assets, or risk grows, forming a Maryland LLC - and possibly electing S-corp taxation - can add liability protection and tax flexibility that a sole proprietorship cannot offer.

Understand your Maryland tax calendar as a sole proprietor. Because no employer withholds for you, you generally pay quarterly estimated taxes to both the IRS and the Comptroller of Maryland to cover federal and state income tax plus the 15.3% self-employment tax. Maryland's county (local) income tax is collected with the state return, so factor it into your estimates. Underpaying during the year can trigger penalties, so set aside a percentage of each payment you receive.

If you registered a trade name or hold a sales and use tax license, keep those current and file sales tax returns on the schedule the Comptroller assigns, even for periods with no sales. Renew any trader's or local license annually. Keeping clean books, separating business and personal accounts, and tracking these deadlines makes tax time far easier and positions you to convert cleanly to an LLC when the time comes.

Frequently Asked Questions

Do I have to register a sole proprietorship in Maryland?

No. Maryland requires no state formation filing to create a sole proprietorship — you become one by doing business. You may optionally register a trade name with SDAT and must obtain any licenses your activity requires.

Does a Maryland sole proprietor need an EIN?

Not always. You can use your Social Security number if you have no employees, but you must get a free EIN if you hire employees or file certain taxes. Many get one anyway to protect their SSN and open a bank account.

How is a Maryland sole proprietorship taxed?

You report business profit on Schedule C and pay Maryland individual income tax, plus 15.3% self-employment tax on net earnings via Schedule SE. Quarterly estimated payments to the IRS and Maryland are generally required.

What is a Maryland trade name?

A trade name (DBA) lets a sole proprietor operate under a name other than their legal name. You register it with SDAT for about $25. It does not create a separate entity or provide liability protection.

Is a sole proprietor personally liable in Maryland?

Yes. A sole proprietorship has no legal separation from its owner, so the owner is personally liable for all business debts and lawsuits. Forming an LLC is the common way to gain liability protection.

Do Maryland sole proprietors need a business license?

Often yes. You may need a sales and use tax license from the Comptroller (free) and a trader's license from the Circuit Court clerk if you sell goods, plus any local or professional licenses.

Related

More Maryland business guides

Form an LLC Registered Agent Get an EIN Foreign LLC LLC Cost Annual Report Articles of Organization Operating Agreement Dissolve an LLC Business License

Sources

  1. Maryland SDAT - Maryland trade name filing.
  2. Maryland SDAT - Register your Maryland business.
  3. Comptroller of Maryland - Sales and use tax license.
  4. Comptroller of Maryland - Maryland business taxes.
  5. Maryland Statutes - Maryland business regulation code.
  6. Cornell LII - Sole proprietorship.
  7. Cornell LII - Limited liability company (LLC).
  8. IRS - About Schedule C (Form 1040), Profit or Loss From Business.
  9. IRS - Self-Employment Tax (Social Security and Medicare Taxes).
  10. IRS - About Schedule SE (Form 1040), Self-Employment Tax.
  11. IRS - Get an Employer Identification Number.
  12. IRS - About Form SS-4, Application for Employer Identification Number.
  13. IRS - Estimated Taxes.
  14. IRS - Single Member Limited Liability Companies.

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 thresholds change; verify current requirements with the the Maryland Department of Assessments and Taxation and the Comptroller of Maryland before acting.