Sole Proprietorship in Indiana: How to Start One

Sole Proprietorship in Indiana: How to Start One

Sole Proprietorship in Indiana: How to Start One

A sole proprietorship is the simplest way to start a business in Indiana. There's no state filing to create the entity itself: if you start doing business under your own legal name, you're already operating as a sole proprietor. The work comes in afterward, registering a business name if you want one, getting the right tax accounts set up, and picking up any licenses your specific business needs. This guide walks through exactly what an Indiana sole proprietor needs to do, in order, with the actual costs and agencies involved.

What Is a Sole Proprietorship in Indiana?

A sole proprietorship is an unincorporated business owned and run by one person, with no legal separation between the owner and the business. There's no Secretary of State entity to form, unlike an LLC or corporation. That simplicity is the main appeal: minimal paperwork, no annual state report, and business income flows straight through to your personal tax return. The tradeoff is that you have unlimited personal liability. If the business is sued or can't pay a debt, your personal assets, car, savings, home equity, are exposed. There is no legal shield between you and the business the way there is with an indiana sole proprietorship compared to a formal entity.

If personal liability protection matters to you, an LLC is worth comparing before you commit. But if you're testing an idea, freelancing, or running a small side business, a sole proprietorship is usually the fastest and cheapest way to get moving.

What You'll Need Before You Start

  • A business name decision: your own legal name, or a separate "doing business as" (DBA) name
  • Your Social Security number (or an EIN, if you choose to get one)
  • A local address for the county recorder filing, if you're using a DBA
  • A general idea of what you're selling, goods, services, or both, since that determines your tax registrations
  • A few dollars for filing fees: DBA and Registered Retail Merchant Certificate costs are modest but real
  • Access to INBiz (inbiz.in.gov), Indiana's online business portal, for tax registration

Step-by-Step: How to Start a Sole Proprietorship in Indiana

Step 1: Decide on your business name

If you're going to operate under your own legal name (for example, "Jane Miller Photography" where Jane Miller is your actual name), you can skip name registration entirely. You're legally allowed to start working immediately.

If you want to operate under a different name, say, "Hoosier Lens Photography", that's called an assumed business name, or a DBA ("doing business as"). Indiana requires you to file for that name before using it. Take a few minutes to check that the name isn't already trademarked or heavily used by a similar local business, even though Indiana's assumed-name filing for sole proprietors doesn't run through the Secretary of State's distinguishability check the way an LLC or corporation name does.

Step 2: File your Certificate of Assumed Business Name (if using a DBA)

This is the step that trips people up most. Unlike LLCs and corporations, which file their assumed name with the Indiana Secretary of State through INBiz, sole proprietorships and general partnerships file their DBA with the recorder's office in the county where the business is located, not with the state.

Indiana has 92 counties, and each county recorder sets its own fee for recording an assumed business name, so the cost varies depending on where you're based. Contact your county recorder's office directly to confirm the current fee and their filing process (some accept walk-ins, some accept mail, and a growing number accept filings online). The state does publish a standard Certificate of Assumed Business Name form (State Form 30353), which many counties use as a starting template, though your recorder may have their own version.

Step 3: Decide whether you need an EIN

As a sole proprietor with no employees, you can generally use your Social Security number for tax purposes and skip getting an Employer Identification Number (EIN) from the IRS. That said, many sole proprietors get one anyway because it lets you avoid handing out your SSN to clients and vendors who request a W-9, and it's required the moment you hire your first employee. The IRS issues EINs for free through its online application; there's no state fee involved. If your work involves any federal excise taxes or you plan to open a business bank account, most banks will ask for one too.

Step 4: Register with the Indiana Department of Revenue

If you're selling taxable goods or certain taxable services in Indiana, you need a Registered Retail Merchant Certificate from the Indiana Department of Revenue before you make your first sale. It costs $25 and is a one-time fee (it doesn't need annual renewal like some states require). You register through INBiz at the same time you can set up other state tax accounts, including withholding tax if you plan to have employees.

Indiana's state sales tax rate is 7%, applied at the point of sale on taxable transactions, and there are no local sales tax add-ons layered on top the way some states allow. Register at the Department of Revenue's business registration page.

Step 5: Check for local and professional licensing requirements

Indiana does not have a single, statewide general business license that every business needs. What you might need instead depends entirely on what you do:

  • Profession-specific licenses: contractors, cosmetologists, healthcare providers, real estate agents, and dozens of other professions need a license from the Indiana Professional Licensing Agency.
  • Local permits: your city or county may require a general business permit, zoning approval, or a home occupation permit if you're running the business out of your house.
  • Health permits: food-related businesses typically need county health department approval.

Check with your city clerk's office and county government directly since requirements vary by location, sometimes significantly between neighboring cities.

Step 6: Understand how you'll be taxed

A sole proprietorship has no separate business tax return. All business income and expenses get reported on your personal federal Form 1040 (Schedule C), and that net income flows into your Indiana personal income tax return as well. For 2026, Indiana's flat individual adjusted gross income tax rate is 2.95%, and it's scheduled to drop to 2.90% in 2027. On top of that, you'll owe a county local income tax, which varies depending on which of Indiana's 92 counties you live in.

Because a sole proprietor doesn't have taxes withheld from a paycheck, you're generally responsible for making quarterly estimated tax payments to both the IRS and the Indiana Department of Revenue to avoid a penalty at filing time.

Step 7: Open a separate business bank account

Not legally required for a sole proprietorship, but strongly worth doing. Mixing personal and business funds in one account makes bookkeeping a headache and makes it harder to prove business expenses if you're ever audited. Most banks will ask for your DBA certificate (if you have one) and either your EIN or SSN to open the account.

Quick Reference: Indiana Sole Proprietorship Costs

ItemCostWhere to File
Assumed Business Name (DBA)Set by county recorder, varies by countyCounty recorder's office
Registered Retail Merchant Certificate$25 (one-time)Indiana Department of Revenue / INBiz
EIN (optional)FreeIRS.gov
Local/professional licensesVaries by profession and localityIndiana Professional Licensing Agency / local city or county

Tips and Common Mistakes to Avoid

  • Don't confuse the sole proprietor DBA process with the LLC process. If you search for how to file an assumed name in Indiana, you'll often land on INBiz instructions meant for LLCs and corporations. Those entities file with the Secretary of State. A sole proprietor files with the county recorder instead.
  • Don't skip the Registered Retail Merchant Certificate if you're selling anything taxable. Selling without one, even accidentally, can trigger penalties from the Department of Revenue.
  • Don't assume "no state license" means "no license." Plenty of sole proprietors get caught off guard by a city zoning requirement or a professional licensing rule they didn't know applied to them.
  • Don't wait until tax season to think about estimated payments. Underpaying throughout the year is one of the most common cash-flow surprises for new sole proprietors, at both the federal and Indiana state level.
  • Don't skip the separate bank account, even though nothing forces you to open one. It will save you hours of untangling receipts later.

What to Expect After You Start

Once your name is registered (if applicable) and your tax accounts are set up, you can generally start operating and invoicing clients or customers right away. Processing times for a county DBA filing tend to be quick, often same-day or within a few business days, though this can vary by county and is worth confirming directly with your recorder's office. Keep in mind that individual results can vary based on your specific business activities, your county's processing speed, and any profession-specific licensing timelines that may apply. If your business grows to the point where personal liability exposure or tax treatment starts to matter more, converting to an LLC later is a straightforward and common next step for many Indiana sole proprietors.

Helpful Resources

This article is for general informational purposes only and does not constitute legal or tax advice. Indiana county recorder fees, licensing requirements, and tax rules can change and vary by location and industry. For guidance specific to your situation, consult a licensed attorney or a CPA familiar with Indiana small business requirements before you start a sole proprietorship in Indiana.