Sole Proprietorship in Indiana (2026)

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

A sole proprietorship in Indiana needs no state formation filing and no fee to start. If you use a business name, you file a county assumed-business-name certificate; if you sell taxable goods, you need a $25 Registered Retail Merchant Certificate from the Indiana Department of Revenue. Profit is reported on federal Schedule C with 15.3% self-employment tax and on your Indiana return.

What a Sole Proprietorship Is in Indiana

A sole proprietorship is an unincorporated business owned by one individual. It is the default structure in Indiana: begin selling goods or services on your own, take no steps to form an entity, and you are a sole proprietor automatically. There is no legal separation between you and the business, so you keep all the profit directly and are personally responsible for the business's debts, contracts, and liabilities. The appeal is simplicity and low cost; the trade-off is the absence of a liability shield.

Because a sole proprietorship is not a separate legal entity, it does not file organizational documents with the Indiana Secretary of State the way a corporation or a limited liability company does. That makes it the quickest way to begin, but it offers no protection for your personal assets. If you want that protection, compare a sole proprietorship with an LLC and read our S-Corp vs LLC guide; the glossary defines the terms used below.

No State Formation Filing Required

Indiana has no registration form or fee that creates a sole proprietorship. You will not find a sole-proprietor filing in INBiz, the state's business portal, which handles entities such as LLCs and corporations. Forming an Indiana LLC is a separate, deliberate step that requires filing Articles of Organization and appointing an Indiana registered agent.

What every sole proprietor must handle are the obligations that apply to any business: an assumed-business-name filing if you use a trade name, sales tax registration if you make taxable sales, an EIN in certain situations, and any local or professional licenses. None of these turn your sole proprietorship into a separate entity; they simply let you operate lawfully and collect and remit the taxes Indiana requires.

Registering an Assumed Business Name (DBA)

If you do business under your own full legal name, Indiana does not require any name filing. If you use a fictitious or assumed name — a DBA — a sole proprietor registers it by filing a Certificate of Assumed Business Name with the county recorder in the county where the business operates. This is different from LLCs and corporations, which register assumed names through the Secretary of State. Filing puts the public on notice of who is behind the name.

An assumed-name filing does not create a separate business or provide liability protection, and it does not give you exclusive statewide rights to the name. To protect a brand against competitors, look at a state or federal trademark registration, which is a distinct process. For the specific form, fee, and any recording requirements, contact your county recorder and see our overview of Indiana DBA filing.

EIN: When You Need One

An Employer Identification Number (EIN) is a free federal tax ID from the IRS. A sole proprietor without employees can generally use their Social Security number, so an EIN is optional in that case. You must obtain an EIN if you hire employees, file employment or certain excise tax returns, or set up a qualified retirement plan. Many banks also ask for an EIN to open a business account, and using one keeps your Social Security number off vendor forms such as the W-9.

Applying is free through the IRS online EIN assistant, and the number is issued immediately; avoid third-party sites that charge for it. If you are a non-U.S. individual without a Social Security number, review the IRS application rules and our guide to the ITIN. For a complete walkthrough, read how to get an EIN.

Indiana Sales Tax: The Retail Merchant Certificate

If your sole proprietorship sells tangible personal property or certain taxable services in Indiana, you must register as a retail merchant before making sales. You obtain a Registered Retail Merchant Certificate (RRMC) from the Indiana Department of Revenue through the INBiz portal, and the registration carries a $25 fee. Once registered, you collect Indiana's 7% state sales tax on taxable sales and remit it to the Department of Revenue on the schedule the state assigns. The certificate is displayed at your place of business and is periodically renewed by the state.

Indiana has no single statewide general business license that every business must hold, but many activities require specific state licenses or permits, and some cities and counties impose their own requirements. Regulated professions are licensed by their respective boards. Check both your local government and any board that governs your work. Our business license overview and the Indiana business license guide explain how to identify which apply.

Taxes: Self-Employment and Indiana Income Tax

A sole proprietorship is a pass-through for income tax: the business pays no separate federal income tax. You report business income and expenses on Schedule C with your Form 1040, and the net profit flows to your personal return. On that profit you owe self-employment tax of 15.3% — 12.4% Social Security up to the annual wage base plus 2.9% Medicare — figured on Schedule SE, half of which is deductible when computing adjusted gross income.

Because no employer withholds for you, you generally make quarterly estimated payments to the IRS (Form 1040-ES). Indiana taxes the same profit on your state return: the state imposes a flat individual income tax plus local county income taxes, and it expects estimated payments when withholding does not cover your liability. Because Indiana's flat rate is scheduled to change over time, confirm the current rate with the Department of Revenue. To model your total burden and see how an S-corporation election can reduce self-employment tax as you grow, use the self-employment tax calculator and review business tax and Indiana LLC tax filing.

Liability and Moving to an LLC

The central trade-off is liability. With no legal separation, a business debt or a lawsuit against the business is a claim against you personally, and your home, savings, and other assets can be at risk. A sole proprietorship also cannot be sold as an entity and ends when you stop operating. For a small, low-risk venture, the simplicity is often acceptable. As revenue, contracts, employees, or exposure grow, many owners convert to an Indiana LLC for a liability shield and cleaner separation of finances.

Converting means forming the LLC, moving accounts and contracts into it, and adopting an operating agreement. Your RRMC, EIN, and income-tax duties carry into the new structure. Before choosing a name, run the Indiana business entity search, and compare a single-member LLC setup with staying a sole proprietor.

Frequently Asked Questions

Do you register a sole proprietorship with the state in Indiana?

No. Indiana has no state-level formation filing for a sole proprietorship; you are one the moment you begin doing business. You may still need a county assumed-business-name filing, an RRMC, and local or professional licenses.

Does an Indiana sole proprietor need a DBA?

Only if you use a name other than your own legal name. A sole proprietor files a Certificate of Assumed Business Name with the county recorder where the business operates, not with the Secretary of State.

How much is an Indiana Registered Retail Merchant Certificate?

The RRMC costs a $25 registration fee through the Indiana Department of Revenue on INBiz. You need it to collect and remit Indiana's 7% sales tax on taxable sales.

Does an Indiana sole proprietor need an EIN?

Not always. A sole proprietor with no employees can use a Social Security number. You must get a free EIN if you hire employees, file certain excise or pension returns, or a bank requires one.

How is a sole proprietorship taxed in Indiana?

Profit passes to your personal return. You report it on federal Schedule C, pay 15.3% self-employment tax on Schedule SE, and include the income on your Indiana return, which has a flat state tax plus local county income tax.

Related

• Sole proprietorship (cluster hub)
• How to form an LLC in Indiana
• Indiana DBA filing
• How to get an EIN
• Business tax basics
• Sole proprietorship in Arkansas (sibling)
• Sole proprietorship in Hawaii (sibling)

Sources

1. IRS — Sole Proprietorships.
2. IRS — About Schedule C (Form 1040).
3. IRS — Self-Employment Tax (15.3%).
4. IRS — About Schedule SE (Form 1040).
5. IRS — Get an Employer Identification Number.
6. IRS — Do You Need an EIN?
7. IRS — Estimated Taxes.
8. IRS — About Form 1040-ES.
9. Indiana Department of Revenue — Business Tax (Registered Retail Merchant Certificate; 7% sales tax).
10. Indiana Department of Revenue — Sales Tax.
11. Indiana Department of Revenue — Individual Income Taxes (flat rate; county tax).
12. INBiz — Indiana Business Portal (RRMC registration).
13. Indiana Code — Title 23, Article 0.5 (Assumed Business Names) (via Justia).
14. Indiana Code — Title 6, Taxation (via Justia).
15. U.S. Small Business Administration — Choose a Business Structure.

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 rates change; verify current requirements with the Indiana Department of Revenue, your county recorder, and the IRS before acting.