Self-Employment Tax Calculator 2025
Calculate your Social Security and Medicare self-employment tax with the 2025 wage base cap of $168,600.
How it works:
1. 92.35% of net income is subject to SE tax
2. Social Security: 12.4% on first $168,600
3. Medicare: 2.9% on all SE earnings
4. Additional Medicare: 0.9% above $200,000
5. You can deduct 50% of SE tax from income
Taxable SE Earnings (92.35%)
$0
Total Self-Employment Tax
$0
Social Security (12.4%)
$0
Medicare (2.9%+)
$0
Deductible Half (50%)
$0
Above-the-line deduction on Form 1040
Effective SE Tax Rate
0%
Understanding Self-Employment Tax
Self-employment tax is the way self-employed individuals pay into Social Security and Medicare, the same programs funded by FICA payroll taxes for traditional employees. If you are a freelancer, independent contractor, sole proprietor, or gig worker, you are responsible for paying both the employer and employee portions of these taxes, which together total 15.3% on net self-employment earnings.
How the Calculation Works
The IRS does not tax 100% of your self-employment income. Instead, you first multiply your net earnings by 92.35% (0.9235) to arrive at your taxable self-employment earnings. This adjustment mirrors the fact that employers pay half of FICA and that portion is not taxable income. From this base, 12.4% goes to Social Security on earnings up to the 2025 wage base cap of $168,600, and 2.9% goes to Medicare on all earnings with no cap. If your earnings exceed $200,000 ($250,000 for married filing jointly), an additional 0.9% Medicare surtax applies to the amount above the threshold.
The 50% Deduction
One important benefit for self-employed individuals is the ability to deduct half of your self-employment tax as an above-the-line adjustment to income on your federal tax return. This reduces your adjusted gross income and therefore your income tax, partially offsetting the burden of paying both halves of the payroll tax. This deduction is automatic and does not require itemizing. Be sure to factor it in when estimating your total tax liability and planning quarterly estimated payments.
Disclaimer: This calculator is for informational purposes only and does not constitute financial, tax, or legal advice. Always consult a qualified professional for decisions specific to your situation.
Frequently Asked Questions
What is self-employment tax?
Self-employment tax covers Social Security and Medicare contributions for people who work for themselves. It is the equivalent of the FICA taxes split between employers and employees. Self-employed individuals pay both halves, totaling 15.3% (12.4% Social Security + 2.9% Medicare).
Why is self-employment tax 15.3%?
The 15.3% rate combines both the employer (7.65%) and employee (7.65%) shares of FICA tax. Since self-employed people are both employer and employee, they pay both halves. However, they can deduct the employer-equivalent half when calculating income tax.
Can I deduct half of self-employment tax?
Yes. You can deduct 50% of your self-employment tax as an above-the-line deduction on your income tax return. This lowers your adjusted gross income and reduces your income tax liability. The deduction is taken on Schedule 1 of Form 1040.
Do I need to make quarterly estimated tax payments?
Yes, if you expect to owe $1,000 or more in taxes. Estimated payments are due April 15, June 15, September 15, and January 15 using Form 1040-ES. This covers both income tax and self-employment tax. Underpayment may result in penalties.