How to Start a Sole Proprietorship in 2025

A sole proprietorship is the simplest and most affordable business structure to launch—registering costs as little as $50–$500 depending on your state, and you can often complete the process in 1–3 business days. According to the U.S. Bureau of Labor Statistics, approximately 70–80% of small businesses start as sole proprietorships, making it the most common business structure for independent workers. This guide covers everything you need to launch your sole proprietorship legally, financially, and strategically.

Understanding the Sole Proprietorship Structure

A sole proprietorship is an unincorporated business owned and operated by a single individual. The owner retains 100% of the profits but also assumes unlimited personal liability for business debts and legal obligations. This structure requires no formal registration with state or federal agencies unless you operate under a business name different from your legal name.

Key characteristics of sole proprietorships include:

• Simplicity: No corporate filings, shareholder agreements, or board meetings required
• Pass-through taxation: Business income “passes through” to your personal tax return, avoiding double taxation
• Control: You make all decisions independently without partners or investors
• Limited growth potential: Inability to sell equity or bring on partners limits scaling opportunities

According to the IRS, over 24 million sole proprietorships filed tax returns in the most recent reporting year, representing roughly 73% of all business tax returns. The average sole proprietor earns approximately $45,000–$55,000 annually before taxes, according to Census Bureau data, though income varies dramatically by industry.

Step-by-Step Registration Process

1. Verify Your Business Name

If you plan to operate under your legal name (e.g., “John Smith”), no additional registration is needed. However, if you want to use a fictitious business name or trade name, you must file a “ DBA” (Doing Business As) statement with your county clerk’s office. Costs range from $10–$150 depending on jurisdiction.

2. Obtain Required Licenses and Permits

Depending on your industry and location, you may need:

• General business license: $25–$300 annually
• Professional licenses (contractors, accountants, hairstylists): Varies by profession
• Sales tax permit: Free through your state’s revenue department
• Zoning permits: Typically $50–$200

The U.S. Small Business Administration (SBA) recommends checking with your city or county clerk and reviewing the SBA’s “Business License Lookup” tool to identify all required permits.

3. Obtain an EIN (Employer Identification Number)

Even without employees, sole proprietors should obtain an EIN from the IRS for tax filing, banking, and client invoicing purposes. The application is free and can be completed online in minutes at IRS.gov. According to IRS data, over 4 million EINs are issued annually, with sole proprietors representing the majority.

4. Open a Business Bank Account

Separating personal and business finances is critical for tax compliance and liability protection. Most banks require an EIN and DBA filing (if applicable) to open a business checking account. Average business checking account fees range from $0–$25 monthly, with many major banks offering fee waivers for new businesses.

5. Understand Quarterly Tax Obligations

Sole proprietors must pay self-employment tax (Social Security and Medicare) quarterly if expecting to owe $1,000 or more annually. The IRS Form 1040-ES provides quarterly estimated tax vouchers. For 2024, self-employment tax rates are 15.3% on net earnings up to $168,600, with additional Medicare tax of 0.9% on income above $200,000 (individual) or $250,000 (married filing jointly).

Financial and Tax Considerations

Expense Tracking and Deductions

Sole proprietors can deduct ordinary and necessary business expenses including home office costs, equipment, software subscriptions, marketing, and professional services. The IRS allows the home office deduction using either the simplified method ($5 per square foot up to 300 sq ft) or the regular method (actual expenses proportional to office space). According to TurboTax, sole proprietors who track expenses save an average of $2,000–$5,000 annually in taxes compared to those who don't.

Record Keeping Requirements

The IRS requires sole proprietors to maintain records for at least 3 years from the filing date (or longer for certain situations). Essential records include:

• Income and expense receipts
• Bank statements and cancelled checks
• Mileage logs for vehicle deductions (2026 standard mileage rate: 67 cents per mile)
• Contracts and client agreements

Insurance Considerations

While not legally required, sole proprietors should consider:

• General liability insurance: $500–$2,000 annually for small businesses
• Professional liability (E&O) insurance: $1,000–$3,000 annually depending on industry
• Health insurance: Individual plans average $400–$800 monthly for self-employed owners (with potential deductions under the self-employed health insurance deduction)

Growing Your Sole Proprietorship

As revenue increases, many sole proprietors eventually convert to an LLC or S-corporation structure for tax benefits and liability protection. The IRS allows a sole proprietorship to file an election to become an LLC taxed as a disregarded entity (for single-member LLCs) or as an S-corporation (potentially reducing self-employment taxes). For businesses exceeding $80,000–$100,000 in annual profit, S-corporation election can save $10,000–$20,000 annually in self-employment taxes, according to CPA recommendations.

Consider consulting a certified public accountant (CPA) or tax attorney when your business reaches $50,000+ in annual revenue to optimize your tax strategy and entity structure. The National Association of Self-Employed estimates that 25–30% of sole proprietors transition to LLC structures within five years of launch.

Frequently Asked Questions

How much does it cost to start a sole proprietorship?

Starting a sole proprietorship costs as little as $0 if you operate under your legal name. However, expect to spend $50–$500 for DBA filings, business licenses, and EIN registration. Additional annual costs include business license renewals ($25–$300) and potential insurance premiums.

Do I need a business bank account as a sole proprietor?

While not legally required, a separate business bank account is highly recommended. It simplifies tax preparation, establishes business credibility, and provides clearer documentation if the IRS audits your returns or a client disputes an invoice. Most clients and vendors expect payments to come from a business-named account.

Can a sole proprietorship have employees?

Yes, sole proprietors can hire employees. You’ll need to register for payroll taxes, obtain workers' compensation insurance (required in most states), and comply with federal and state employment regulations. Hiring your first employee typically costs $1,000–$3,000 in setup and compliance expenses.

Conclusion

Starting a sole proprietorship remains the fastest and most cost-effective path to self-employment, with minimal paperwork and full operational control. For most independent professionals—freelancers, consultants, contractors, and small-service providers—the structure provides sufficient flexibility and tax simplicity. Before launching, ensure you have the required licenses, an EIN, and a system for tracking income and expenses. As your business grows beyond $50,000–$80,000 in annual profit, revisit your entity structure with a qualified tax professional to maximize deductions and protect your personal assets.