Self-employed taxes explained

Freelancers, contractors, and small-business owners pay taxes differently from W-2 employees. There is no employer to withhold income tax or cover half of Social Security and Medicare. Instead, you owe self-employment tax on net earnings and must often make quarterly estimated payments to stay current with the IRS.^[1] Understanding both layers — income tax and self-employment tax — is essential for pricing your work, setting aside cash, and avoiding April surprises.

Net self-employment income is generally your gross business receipts minus ordinary and necessary business expenses. That net amount flows to your Form 1040 and triggers Schedule SE for self-employment tax, in addition to regular income tax at your marginal bracket.

Self-employment tax: the employer half you pay

W-2 workers split FICA: employees pay 7.65% and employers match another 7.65% on wages up to the Social Security wage base. Self-employed individuals pay both halves — 15.3% on net earnings — though you can deduct half of self-employment tax when calculating income tax.^[2][4]

The 15.3% combines 12.4% Social Security (on earnings up to the annual wage base) and 2.9% Medicare (on all net earnings, plus an additional 0.9% Medicare surtax above certain income thresholds). This is often the biggest shock for new freelancers who budget only for income tax, not the full FICA equivalent.

Use our self-employed tax calculator to estimate self-employment tax, income tax, and total liability from net profit, filing status, and other income.

Quarterly estimated payments

The U.S. tax system is pay-as-you-go. When no employer withholds, you generally must make estimated tax payments four times a year if you expect to owe at least $1,000 after withholding and credits.^[3] Due dates are typically April 15, June 15, September 15, and January 15 of the following year (adjusted when weekends or holidays intervene).

Safe-harbor rules protect you from underpayment penalties if you pay either 90% of current-year tax or 100% of prior-year tax (110% if prior-year adjusted gross income exceeded $150,000). Many self-employed workers use the prior-year safe harbor while tracking current-year income quarterly and increasing payments if business is stronger than expected.

The income tax estimator helps project total federal liability when you combine W-2 wages with freelance profit.

Deductions that reduce net profit

Legitimate business expenses lower both income tax and self-employment tax because they reduce net earnings. Common categories include home office (if exclusive and regular use), software and equipment, professional services, marketing, travel, and health insurance premiums (with specific rules for self-employed health insurance deductions).

The qualified business income (QBI) deduction may reduce taxable income for eligible pass-through business income, though it does not reduce self-employment tax itself — only income tax. Retirement contributions through a SEP-IRA or solo 401(k) can reduce income tax; see our 401(k) vs. IRA guide for account-type trade-offs.

Keep contemporaneous records: receipts, mileage logs, and separate business bank accounts simplify audit defense and make quarterly estimates more accurate.

Self-employed vs. W-2: side-by-side

• Withholding: W-2 employers withhold automatically; self-employed workers pay via estimated taxes (and optional W-4 extra withholding if they also have a W-2 job)
• FICA: W-2 split 50/50 with employer; self-employed pay 15.3% on net earnings via Schedule SE
• Expenses: employees rarely deduct unreimbursed job costs; self-employed deduct ordinary business expenses against gross receipts
• Forms: clients may issue 1099-NEC for payments of $600 or more; you report everything on Schedule C even if no 1099 was sent

If you also earn W-2 wages, read our W-4 withholding guide for adjusting employer withholding to cover tax on side income, and the paycheck calculator to see how much room remains in each check after current withholding.

Planning cash flow for tax season

A practical rule: set aside 25–30% of net self-employment profit in a dedicated tax savings account, then adjust after your first full year of actual liability. Pay estimated taxes on schedule even when cash is tight — penalties and interest on underpayment often exceed short-term borrowing costs.

Consider working with a CPA if you have multi-state income, employees, inventory, or significant equipment purchases. Software can handle straightforward Schedule C filing, but entity choice (sole prop vs. S-corp) and reasonable salary decisions for S-corps benefit from professional advice.