What This Calculator Does
You went freelance last year and earned $80,000 in net profit. Then you discovered the self-employment tax bill: about $11,304 on top of your regular income tax. That is the cost of being both the employer and the employee for Social Security and Medicare. This calculator runs the Schedule SE math so you know the number before April.
Enter your net self-employment profit from Schedule C and your filing status. The tool applies the 92.35% adjustment, the 2026 Social Security wage base of $184,500, the 12.4% Social Security rate, the 2.9% Medicare rate, and the 0.9% additional Medicare tax where it applies. It also returns the deductible half of your SE tax, which lowers your adjusted gross income.
According to the Social Security Administration, the maximum Social Security tax an employee pays in 2026 is $11,439, while a self-employed person pays the full $22,878 on earnings at or above the wage base. The deductible half is what keeps the self-employed from paying a penalty compared to a W-2 worker.
Inputs Required
- Net Self-Employment Profit: Your Schedule C net profit, before any SE tax deduction. Enter 0 for a loss year.
- Filing Status: Single or Married Filing Jointly. This sets the threshold for the additional 0.9% Medicare tax.
Outputs Provided
- Net Earnings from SE: Your profit multiplied by 92.35%, the figure Schedule SE actually taxes
- Social Security Tax: 12.4% of net earnings up to the $184,500 wage base
- Medicare Tax: 2.9% of all net earnings, with no cap
- Additional Medicare Tax: 0.9% on earnings above $200,000 single or $250,000 married
- Deductible Half: Half of your total SE tax, deducted on Schedule 1 to reduce AGI
How the Calculation Works
Schedule SE follows a specific sequence. First, your net profit is reduced by 7.65% to approximate the employer half of FICA that a W-2 worker never sees. Then the Social Security and Medicare rates apply to that adjusted figure.
Net Earnings = Net Profit x 0.9235
SS Tax = min(Net Earnings, $184,500) x 12.4%
Medicare Tax = Net Earnings x 2.9%
Additional Medicare = max(0, Net Earnings - Threshold) x 0.9%
Total SE Tax = SS Tax + Medicare Tax + Additional Medicare
Deduction = Total SE Tax / 2
The 92.35% multiplier is the part most freelancers miss. It exists because employees only pay 7.65% out of pocket while their employer pays the other 7.65%. For the self-employed, the IRS lets you subtract the employer-equivalent half before calculating the tax, so you are taxed on a smaller base. The deductible half at the end serves a similar purpose on your income tax return.
For the $80,000 profit example: net earnings are 80,000 x 0.9235 = $73,880. Social Security tax is 73,880 x 0.124 = $9,161. Medicare tax is 73,880 x 0.029 = $2,142. Total SE tax is $11,304, and the deductible half is $5,652. That deduction lowers your AGI, which in turn lowers your income tax.
How to Use the Calculator
- Find your net profit on Schedule C, line 31. This is your revenue minus business expenses.
- Enter that number as your net self-employment profit.
- Select your filing status. The additional Medicare tax threshold depends on it.
- Read the total SE tax. This is separate from your income tax and is reported on Schedule 2.
- Note the deductible half. You will claim this on Schedule 1, line 15.
If you also have W-2 wages from a day job, those wages count toward the Social Security wage base. The calculator above assumes no W-2 wages. For a combined situation, subtract your W-2 wages from the $184,500 base before applying the 12.4% rate. You can estimate your full income tax including SE tax with our Income Tax Calculator.
Example Calculations
Example 1: A Full-Time Freelancer at $80,000
Priya is a freelance graphic designer with $80,000 in Schedule C net profit. She files single. Net earnings are $73,880. Social Security tax is $9,161 (12.4% of $73,880, well under the wage base). Medicare tax is $2,142. No additional Medicare tax applies because she is under $200,000. Total SE tax is $11,304, and her deductible half is $5,652. Her AGI for income tax purposes drops from $80,000 to $74,348.
Example 2: A High-Earning Consultant at $300,000
Marcus runs a one-person consulting firm with $300,000 in net profit and files single. Net earnings are 300,000 x 0.9235 = $277,050. Social Security tax is capped at 184,500 x 0.124 = $22,878. Medicare tax is 277,050 x 0.029 = $8,035. Additional Medicare tax is (277,050 - 200,000) x 0.009 = $693. Total SE tax is $31,606. The deductible half is $15,803, which is a significant AGI reduction. Even though the SS portion caps out, Medicare never does.
Real World Scenarios
A Side Hustle on Top of W-2 Wages
Sarah earns $150,000 in W-2 wages and $60,000 in freelance profit. Her W-2 wages already use up $150,000 of the $184,500 Social Security wage base, so only $34,500 of her SE net earnings is subject to the 12.4% Social Security tax. Her SE net earnings are 60,000 x 0.9235 = $55,410. SS tax is 34,500 x 0.124 = $4,278 instead of $6,871. Medicare tax is still 55,410 x 0.9235 x 2.9% = $1,607. This is why high earners with side income should track their combined wages to avoid overpaying the SS portion.
A Loss Year With No SE Tax
David's startup lost $20,000 in its first year. Schedule C shows a net loss, so Schedule SE produces zero self-employment tax. He owes no SE tax and gets no deduction. He can carry the loss forward or back to offset other income. The calculator returns $0 for all tax fields when profit is 0 or negative.
Choosing Between an S Corp and Sole Proprietorship
A consultant earning $250,000 as a sole proprietor pays SE tax on the full net earnings. If she forms an S Corp and pays herself a $100,000 salary, she pays FICA only on the $100,000 W-2 wages, and the remaining $150,000 of profit distributions escape Social Security tax entirely. The trade-off is payroll administration, corporate tax returns, and the requirement to pay a reasonable salary. The SE tax savings can be $15,000 or more per year, but the added costs and IRS scrutiny of reasonable compensation make this a decision for a CPA.
Common Mistakes to Avoid
- Forgetting the deductible half: Half of your SE tax is deductible against your gross income. Many new freelancers miss this and overpay their income tax. It goes on Schedule 1, line 15.
- Ignoring the wage base with W-2 wages: If you have a day job, your W-2 wages reduce the amount of SE income subject to Social Security tax. Failing to account for this means overpaying the 12.4% portion.
- Confusing SE tax with income tax: SE tax is the equivalent of FICA. Income tax is separate and stacked on top. A freelancer with $80,000 in profit owes both the $11,304 SE tax and several thousand in federal income tax.
- Not making estimated tax payments: Because no employer withholds for you, you must pay SE tax and income tax quarterly through estimated payments. Underpaying triggers penalties. Use the result from this calculator to set your quarterly amounts.
Limitations of This Calculator
This tool assumes your entire net profit is subject to SE tax and that you have no W-2 wages that reduce the Social Security wage base. It does not handle farm income, church employee income, or the optional methods for computing net earnings. It does not calculate your income tax, which is separate and additional. The additional Medicare tax figure here is an estimate based on SE earnings only; if you have W-2 wages or other income, the threshold is applied to your combined earnings. For an exact figure, file Schedule SE with your tax return or consult a tax professional.
Authoritative Research and Resources
- IRS: Self-Employment Tax (Social Security and Medicare Taxes) - The official IRS guide to Schedule SE, the rates, the wage base, and the deductible half.
- Social Security Administration: Maximum Taxable Earnings - Current and historical Social Security wage base figures, updated each October when the new limit is announced.
For related tools, estimate your federal income tax with our Income Tax Calculator, plan self-employed retirement savings with our SEP IRA Calculator, or find your marginal rate with our Tax Bracket Calculator.