Self-Employment Tax Calculator 2025
Calculate your self-employment tax, federal income tax, and quarterly estimated payments. Built for freelancers, independent contractors, gig workers, and small business owners.
Your Information
Your Tax Summary
Self-Employment Tax Breakdown
Quarterly Estimated Payments
To avoid underpayment penalties, pay at least the amount shown each quarter.
Where Your Money Goes
How Self-Employment Tax Works in 2025
What Is Self-Employment Tax?
Self-employment (SE) tax is the equivalent of the Social Security and Medicare taxes that employees and employers split. When you're self-employed, you pay both halves — the employee portion and the employer portion — for a combined rate of 15.3%.
This is separate from federal income tax. As a freelancer, you owe SE tax in addition to regular income tax on your profits.
The 15.3% Rate Explained
- Social Security (12.4%): Applies to net earnings up to $176,100 in 2025 (up from $168,600 in 2024)
- Medicare (2.9%): Applies to all net earnings — no cap
- Additional Medicare (0.9%): Applies to earnings above $200,000 (single) or $250,000 (married filing jointly)
The 92.35% Adjustment
Before calculating SE tax, you multiply your net profit by 92.35% (0.9235). This adjustment represents the "employer half" of SE tax and mirrors how traditional employees are treated — their employer-paid FICA taxes aren't included in taxable wages.
The Deductible Half
You can deduct 50% of your SE tax from your adjusted gross income (AGI). This is an "above the line" deduction — you get it even if you take the standard deduction. This lowers the income tax you owe but does not reduce your SE tax itself.
Example: $80,000 Net Profit
Quarterly Estimated Tax Payments for 2025
Self-employed individuals don't have taxes withheld from their pay, so the IRS requires you to make quarterly estimated tax payments. If you expect to owe $1,000 or more when you file your return, you generally must make these payments to avoid penalties.
How Much Should You Pay?
You can use either of these methods to calculate safe quarterly payments:
Common Self-Employment Tax Deductions
Reducing your net profit directly lowers both your self-employment tax and your income tax. Here are the most valuable deductions for freelancers and contractors:
Home Office
Simplified method: $5/sq ft up to 300 sq ft ($1,500 max). Regular method: actual expenses proportional to office space.
Vehicle / Mileage
Standard mileage rate: 70¢/mile for 2025. Or deduct actual vehicle expenses proportional to business use.
Equipment & Software
Computers, phones, tools, and software subscriptions used for business. Section 179 allows full first-year deduction.
Health Insurance
Self-employed individuals can deduct 100% of health, dental, and vision insurance premiums for themselves and dependents.
Retirement Contributions
SEP IRA (up to 25% of net profit, max $70,000) or Solo 401(k) contributions reduce taxable income significantly.
Education & Training
Courses, books, conferences, and certifications that maintain or improve skills in your current business.
Frequently Asked Questions
What is the self-employment tax rate for 2025?
The self-employment tax rate for 2025 is 15.3%, consisting of 12.4% for Social Security and 2.9% for Medicare. The Social Security portion only applies to net earnings up to $176,100 (the wage base for 2025). Medicare applies to all net earnings, with an additional 0.9% surtax on earnings above $200,000 for single filers or $250,000 for married filing jointly.
How do I calculate self-employment tax?
Start with your gross self-employment income and subtract business expenses to get net profit. Multiply net profit by 92.35% to get your SE tax base. Apply 12.4% for Social Security (up to the wage base) and 2.9% for Medicare (no limit). You can then deduct half of your SE tax from your adjusted gross income when calculating income tax.
When are quarterly estimated tax payments due?
For 2025, quarterly estimated tax payments are due: April 15 (Q1), June 16 (Q2), September 15 (Q3), and January 15, 2026 (Q4). Missing deadlines can result in underpayment penalties, even if you pay in full when filing.
Do I owe self-employment tax on all my income?
You owe SE tax only on your net self-employment earnings — gross 1099/freelance income minus business expenses. W-2 wages are not subject to SE tax (your employer already pays half of FICA). However, W-2 wages do count toward the Social Security wage base, potentially reducing the SS portion of your SE tax.
Can I reduce my self-employment tax?
Yes, the most direct way is to reduce your net profit through legitimate business deductions. Common strategies include maximizing the home office deduction, tracking all vehicle mileage, contributing to a SEP IRA or Solo 401(k), and deducting health insurance premiums. Some high-earning self-employed individuals also benefit from forming an S-corporation, which can reduce SE tax on a portion of earnings.
What's the difference between self-employment tax and income tax?
Self-employment tax covers Social Security and Medicare — it's a flat-rate tax (15.3%) on net SE earnings. Income tax is the progressive federal tax on all your taxable income (wages + SE profit - deductions) at rates from 10% to 37%. As a freelancer, you owe both. The total combined rate is often 25-40% depending on your income level.
Need the Full Picture?
Our federal tax calculator includes all income sources, deductions, credits, and gives you a complete tax estimate beyond just self-employment.