How Much Does It Cost to Start a Sole Proprietorship?

The cost to start a sole proprietorship is usually between $0 and about $800 in the first year, and the structure itself is free because no state formation filing is required. Most owners spend a modest amount on a trade name registration, a local business license, and liability insurance. The bigger financial hit — self-employment tax — shows up later, and it catches new owners off guard more than any startup fee does.

Why the Structure Itself Is Free

You don’t file formation documents with your state to become a sole proprietor. No articles of organization, no filing fee, no waiting period. The moment you offer goods or services for profit, you’re operating as a sole proprietor by default.¹ Compare that to an LLC or corporation, where formation fees alone run $50 to $500 depending on the state.

The trade-off is that you and the business are the same legal person. Every debt and every lawsuit belongs to you personally. There’s no liability shield. That matters when you weigh the free formation against what you’re giving up in protection, and it’s the reason insurance shows up on nearly every sole proprietor’s budget.

Trade Name (DBA) Registration

If you operate under any name other than your own legal name, you need to register a “Doing Business As” name, sometimes called a fictitious business name. Maria Chen selling under “Lakeside Design” needs a DBA. Maria Chen selling as Maria Chen doesn’t.¹

Filing fees typically run $10 to $100, depending on whether your county or your state handles it. Many jurisdictions also require you to publish the new business name in a local newspaper for several weeks, which adds roughly $40 to $200. All in, budget $50 to $300 for the DBA process. Most registrations expire after five years and need to be renewed at a similar fee. Skipping the filing can create real problems: some jurisdictions treat it as a misdemeanor, and banks often won’t open a business account without proof of the DBA.

Employer Identification Number

An EIN is a nine-digit number the IRS assigns for tax filing and reporting.² A sole proprietor with no employees isn’t strictly required to have one and can use a Social Security number instead. You will need an EIN if you hire anyone, open certain business bank accounts, or file excise tax returns.³

It’s free. The IRS issues EINs immediately through its online tool, and the agency specifically warns against third-party sites that charge for the service.⁴ Never pay for one.

Licenses and Permits

You may still need one or more licenses to operate legally, even though the business structure itself doesn’t get registered. What you need depends entirely on where you are and what you do.

A general city or county business license typically runs $50 to $400 per year. Some jurisdictions scale the fee to projected revenue or employee count.
Professional licenses for regulated fields like contracting, accounting, cosmetology, real estate, and healthcare vary from under $100 to well over $500, with annual renewals on top.
Working from home may require a zoning or home occupation permit, usually $50 to $200.
Industry-specific permits — food service, hazardous materials, alcohol, certain construction work — can each add $100 to $500 or more for health inspections, fire clearances, or environmental compliance.

Start with your city or county government website to identify what applies. The SBA also maintains a directory of state licensing requirements.¹

Insurance

Because a sole proprietorship offers no personal liability protection, insurance is your main financial safety net. Most sole proprietors aren’t legally required to carry general liability coverage, but going without it means a slip-and-fall at a client site or a product defect claim can reach your personal savings and home.

General liability policies for small, low-risk sole proprietorships typically cost $300 to $1,000 per year. Higher-risk work, larger revenue, or broader coverage pushes premiums up. If you provide professional advice or services, an errors-and-omissions policy (also called professional liability) adds another layer at a comparable annual cost.

Workers’ compensation is generally not required if you have no employees, though some states carve out exceptions for certain contractors and high-risk occupations. Check your state before assuming you’re exempt.

A Realistic First-Year Cost Picture

Here’s what a typical service-based sole proprietor operating from home might spend:

State formation filing: $0 (not required)
DBA registration and publication: $50 to $300, or skip if using your legal name
EIN: $0
General business license: $50 to $400
Professional license: $0 to $500 or more, if your field requires one
Home occupation or zoning permit: $0 to $200
General liability insurance: $300 to $1,000 per year
Accounting software: $0 to $600 per year
Tax preparation: $200 to $600 per year

A bare-bones launch using your legal name, no employees, and no professional license can come in under $100. Most sole proprietors end up spending $200 to $800 on initial filings, permits, and first-year insurance.

The Bigger Cost Most New Owners Miss: Self-Employment Tax

Startup fees are the small part of the bill. Self-employment tax is the larger one, and it doesn’t appear on any launch checklist because it hits after you start earning.

Sole proprietors pay self-employment tax on net business earnings to cover Social Security and Medicare — the contributions an employer would normally split with an employee. The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.⁵

The Social Security portion applies only to net earnings up to $184,500 in 2026.⁶ The Medicare portion has no cap. If your net self-employment income exceeds $200,000 ($250,000 for married couples filing jointly), an additional 0.9% Medicare surtax applies to the amount above the threshold.⁷ Half of your self-employment tax is deductible as an adjustment to gross income on your personal return, which lowers your income tax but not the self-employment tax itself.⁵

Quarterly Estimated Payments

W-2 employees have taxes withheld from every paycheck. Sole proprietors don’t, so the IRS wants estimated payments four times a year. You must make them if you expect to owe $1,000 or more in total tax for the year after subtracting withholding and refundable credits.⁸

The 2026 deadlines for calendar-year filers:

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 calculated using the IRS’s quarterly interest rates.⁹ You can generally avoid the penalty by paying at least 90% of your current-year tax liability or 100% of last year’s tax (110% if your adjusted gross income exceeded $150,000). New sole proprietors with no prior-year return to reference should set aside 25% to 30% of net earnings to cover both income tax and self-employment tax.

Sole proprietors report business income and expenses on Schedule C, filed with Form 1040, and calculate self-employment tax on Schedule SE.³ None of these forms carry filing fees. The cost is your time or a preparer’s fee.

Ongoing Costs After Launch

You aren’t required to hire an accountant or buy software, but clean records save money at tax time and protect you in an audit. Cloud-based accounting tools built for sole proprietors start at $0 per month for basic plans and run $25 to $50 per month for invoicing, expense tracking, and tax categorization, so roughly $0 to $600 per year.

A CPA or enrolled agent typically charges $200 to $600 for a straightforward Schedule C return. Multiple income streams, home office deductions, or estimated tax planning push that higher. A startup consultation with a business attorney for contract templates or liability advice runs $150 to $350 per hour depending on your market.

Opening a separate business bank account is strongly recommended even though sole proprietors aren’t required to have one. Most banks offer business checking with no monthly fee or with fees waivable at modest balance thresholds. Keeping business and personal finances separate makes bookkeeping simpler and strengthens your position if the IRS questions your deductions.

If You Hire Employees, the Math Changes

Everything above assumes you’re working alone. Hiring even one employee adds payroll tax withholding, employer-side Social Security and Medicare matching, federal and state unemployment tax, mandatory workers’ compensation insurance in nearly every state, and payroll processing costs of roughly $20 to $50 per month for basic software. Late deposits and missed filings carry steep IRS penalties, so if you plan to hire, budget separately for that transition rather than folding it into your startup number.

1
U.S. Small Business Administration. Register Your Business
2
Internal Revenue Service. About Form SS-4, Application for Employer Identification Number (EIN)
3
Internal Revenue Service. Sole Proprietorships
4
Internal Revenue Service. Get an Employer Identification Number
5
Internal Revenue Service. Topic No. 554, Self-Employment Tax
6
Social Security Administration. Contribution and Benefit Base
7
Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
8
Internal Revenue Service. 2026 Form 1040-ES, Estimated Tax for Individuals
9
Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty