You don’t actually file anything to create a sole proprietorship. The moment you start doing business on your own without registering as an LLC, partnership, or corporation, you are one. So the real question of how to get a sole proprietorship set up is a short checklist: register a trade name if you want one, get a federal tax ID if it helps you, pull the local licenses your city and industry require, and put a tax and bookkeeping system in place before income starts flowing.
Each piece is simple on its own. Skipping any of them can trigger fines, block you from opening a bank account, or leave you unable to prove a deduction two years from now.
You’re Already a Sole Proprietor
The Small Business Administration states it directly: you’re “automatically considered to be a sole proprietorship if you do business activities but don’t register as any other kind of business.”1U.S. Small Business Administration. Choose a Business Structure The freelance designer who sent an invoice last week and the weekend dog walker taking payment through Venmo are both operating as sole proprietors, whether they filed anything or not.
Legally, you and the business are the same person. There’s no shield between your personal assets and anything the business owes or does. That’s what makes the structure easy to start and risky to scale, and it’s the backdrop for every decision below.
Register a Business Name If You’ll Use One
If you plan to operate under your own legal name, you can skip this step. If you want a trade name — say, “Brightside Consulting” instead of “Jane Smith” — you’ll need to file a fictitious business name statement, usually called a DBA (“Doing Business As”). It doesn’t create a separate entity. It just tells the public who’s behind the name.
DBA filings are handled at the county or city level in most places. The form asks for your legal name, the trade name, and your business address. Fees generally fall between $10 and $150, with most counties in the $20 to $50 range. Some jurisdictions also require you to publish the fictitious name statement in a local newspaper, often for four consecutive weeks, before the registration is finalized. That publication adds to the total cost.
DBAs don’t last forever. Renewal periods run from one year in a few places to ten years in others, with five being the most common. Several states don’t require renewal at all and only ask you to update the filing when your information changes. Check your county clerk’s office for your expiration date so the filing doesn’t quietly lapse.
Get an Employer Identification Number
An EIN is a nine-digit tax ID the IRS assigns to businesses. As a sole proprietor with no employees, you can legally use your Social Security number for tax filings instead. Federal regulations allow sole proprietors to use their SSN for individual taxes and a separate EIN for business taxes.2eCFR. 26 CFR 301.6109-1 – Identifying Numbers But an EIN becomes mandatory once you hire employees, and the IRS also requires one if you operate a Keogh retirement plan or file excise tax returns.3Internal Revenue Service. Get an Employer Identification Number
Even when it’s optional, there are reasons to get one. It keeps your Social Security number off invoices and W-9 forms, which reduces identity theft exposure, and many banks prefer or require an EIN to open a business account.
Applying online through the IRS website is free and takes about ten minutes. The system issues your EIN at the end of the session.4Internal Revenue Service. Employer Identification Number Fax applications take about six business days. Paper applications take roughly 30 days.5Internal Revenue Service. Processing Status for Tax Forms There’s no reason to pay a service for it. The IRS charges nothing regardless of how you apply.
Pull the Local Licenses You Need to Operate
Registrations above handle your business identity. Licenses handle your permission to actually operate, and requirements vary by location and industry. The common ones sole proprietors run into:
- General business license or tax certificate. Most cities and many counties require a basic business license before you can legally operate within their jurisdiction. Fees range from under $50 in smaller towns to several hundred dollars in major metro areas. Some localities call this a “business tax certificate.”
- Sales tax permit. If you sell physical goods (and in some states, certain services), you’ll need a seller’s permit or sales tax ID from your state’s revenue department. Selling without one can result in back taxes, interest, and penalties.
- Home occupation permit. Running a business from your residence often requires a zoning permit confirming the activity is allowed in your neighborhood. These are usually inexpensive, but forgetting one can create problems if a neighbor complains.
- Industry-specific licenses. Food businesses need health permits. Contractors often need trade licenses. Cosmetologists, accountants, and other regulated professionals need their state-issued credentials.
The patchwork is where most sole proprietors stumble. Your state might require one thing, your county another, and your city a third. Start with your city clerk’s office and your state’s business portal to build the full list for your situation.
Set Up Taxes Before Income Starts Flowing
You won’t file a separate business tax return. You’ll report all business income and expenses on Schedule C, which attaches to your personal Form 1040, and your net profit gets taxed at your individual rate.6Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship)
Self-Employment Tax
On top of income tax, you owe self-employment tax on net earnings of $400 or more. This covers Social Security and Medicare — the contributions an employer would normally split with you. As a sole proprietor, you pay both halves. The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.7Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) The Social Security portion applies only to the first $184,500 of net earnings in 2026.8Social Security Administration. Contribution and Benefit Base Medicare has no cap.
You can deduct the employer-equivalent half (7.65%) when calculating your adjusted gross income. The deduction reduces your income tax but not the self-employment tax itself.7Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
Quarterly Estimated Payments
Because nobody withholds taxes from your business income, you’re expected to pay as you go. You’ll generally need to make quarterly estimated payments if you expect to owe $1,000 or more in tax for the year after subtracting withholding and refundable credits.9Internal Revenue Service. 2026 Form 1040-ES The 2026 due dates are:
- First quarter: April 15, 2026
- Second quarter: June 15, 2026
- Third quarter: September 15, 2026
- Fourth quarter: January 15, 2027
Missing a deadline triggers an underpayment penalty. You can avoid it by paying at least 90% of your current year’s tax or 100% of last year’s tax, whichever is less. If your adjusted gross income exceeded $150,000 in the prior year, that second threshold bumps to 110%.10Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty New sole proprietors routinely underestimate this and get hit with a penalty on their first return.
Open a Business Bank Account and Start Keeping Records
A dedicated business account isn’t legally required, but it’s one of the most useful early moves. Mixing personal and business transactions makes tax prep painful and weakens your position if the IRS questions a deduction. Most banks will open a business checking account with your EIN (or SSN if you don’t have one) and a business license.11U.S. Small Business Administration. Open a Business Bank Account If you filed a DBA, bring the stamped copy. Banks need it to accept deposits made to your trade name.
The IRS requires you to keep records supporting every item of income, deduction, or credit for as long as they might be relevant. In most cases that means at least three years from the filing date. The window extends to six years if you underreport income by more than 25% of gross income, and there’s no time limit at all if you file a fraudulent return or fail to file.12Internal Revenue Service. Topic No. 305, Recordkeeping A simple spreadsheet works when you’re starting out. The habit is easy to build early and painful to reconstruct later.
If You Hire Someone
Bringing on your first employee triggers several federal requirements that go beyond your initial setup. If you don’t already have an EIN, you’ll need one before issuing any paychecks.13Internal Revenue Service. Hiring Employees From there:
- Form I-9 verifies every new hire’s identity and work authorization, including for U.S. citizens.
- Form W-4 tells you how much federal income tax to withhold. Have it signed before the first paycheck.
- New hire reporting to your state’s directory is required within 20 days of the hire date.14Administration for Children and Families. New Hire Reporting
- Federal unemployment tax (FUTA) kicks in once you pay wages of $1,500 or more in any calendar quarter, or have at least one employee during any day of a week for 20 weeks in a year. The rate is 6.0% on the first $7,000 of each employee’s wages, though a credit for state unemployment taxes typically reduces the effective rate to 0.6%.15U.S. Department of Labor. Unemployment Insurance Tax Topic
You’ll also register with your state’s labor department for state unemployment insurance and workers’ compensation. Employment tax records must be kept for at least four years after the tax is due or paid, whichever comes later.12Internal Revenue Service. Topic No. 305, Recordkeeping The jump from solo operator to employer is the steepest curve in small business, and it’s the point where a payroll service or accountant usually pays for itself.
What No Filing Can Fix
One thing worth saying plainly: no step above shields your personal assets. In a sole proprietorship you have unlimited personal liability for everything the business does. If a customer slips in your shop, if a client sues over a project, if a supplier demands payment on a debt the business can’t cover, creditors can come after your personal bank account, your car, and potentially your home. The only protection comes from whatever property exemptions your state allows in collections or bankruptcy.
This is why most advisors recommend sole proprietors carry general liability insurance at a minimum. A policy doesn’t change the legal structure, but it puts a financial buffer between a business mishap and your personal savings. For low-risk service businesses, basic coverage often runs a few hundred dollars per year. When revenue, employees, inventory, or injury risk grow, many sole proprietors convert to an LLC. The right time to make that switch is before you need the liability protection, not after a lawsuit lands.