Self-Employment Tax Calculator

Estimate Your 1099 Taxes

Calculate 2025 self-employment tax including Social Security, Medicare, and federal income tax. Determine quarterly estimated payments and total tax liability.

Income & Details

Gross Self-Employment Income

$0$500,000

Business Expenses

Office supplies, equipment, mileage, meals, and other deductible business costs.

Filing Status

Additional Medicare tax threshold varies by filing status.

Other W-2 Income

Wages, salaries, or other W-2 employment income from your job.

Quarterly Estimated Payments Already Made

Total amount already paid to IRS for 2025 estimated tax.

Tax Estimate

Effective Rate: 0.0%

Tax Breakdown

Federal Tax

Social Security

Medicare

Take-Home

Quick Summary

Net SE Income $0

Social Security Tax $0

Medicare Tax $0

Federal Income Tax $0

Quarterly Estimated Payments

Per Quarter (÷4) $0

Already Paid $0

Remaining Balance $0

Understanding Self-Employment Tax

Self-employment tax covers Social Security and Medicare taxes for those who work for themselves. Unlike W-2 employees who split these taxes with their employer, self-employed individuals pay both the employee and employer portions, totaling approximately 15.3% of net self-employment income (12.4% Social Security + 2.9% Medicare, plus 0.9% additional Medicare if income exceeds thresholds).

Net Self-Employment Income: Start with your gross self-employment income and subtract deductible business expenses. This gives you net SE income, which is the basis for calculating self-employment tax.

SE Tax Calculation: You multiply your net SE income by 92.35% to account for the employer portion of SE tax, then apply the Social Security rate (12.4% up to the wage base of $176,100 for 2025) and Medicare rate (2.9% on all income). If your SE income exceeds certain thresholds ($200,000 single/$250,000 MFJ), an additional 0.9% Medicare tax applies to the excess.

Deductible Half of SE Tax: You can deduct half of your self-employment tax from your income, which lowers your Adjusted Gross Income (AGI) and reduces your federal income tax liability. This deduction helps offset the burden of paying both employer and employee portions.

Quarterly Estimated Payments: If you expect to owe $1,000 or more in federal taxes for the year, you must make quarterly estimated tax payments (usually April 15, June 15, September 15, and January 15). Failure to make these payments may result in penalties and interest.

2025 Key Rates: The Social Security wage base for 2025 is $176,100. Additional Medicare tax applies to net self-employment income above $200,000 (single)/$125,000 (MFS)/$250,000 (MFJ)/$200,000 (HOH). Standard deductions: Single $15,000, MFJ $30,000, MFS $15,000, HOH $22,500.

Common Questions

Self-employment income is your gross revenue from your business or freelance work. Net self-employment income is what you have after subtracting all deductible business expenses—office supplies, equipment, mileage, professional services, home office deduction, and other legitimate business costs. Your self-employment tax is calculated on this net income, so keeping good expense records can significantly reduce your tax burden.

W-2 employees pay half of Social Security and Medicare taxes (about 7.65%), and their employer pays the other half. Self-employed individuals pay both portions directly—approximately 15.3% total. However, you can deduct half of your self-employment tax from your income, which reduces your federal income tax, partially offsetting the extra burden. This calculator includes that deduction in computing your total tax liability.

Quarterly estimated payments are amounts you pay directly to the IRS throughout the year to cover your expected federal income tax and self-employment tax. Payments are typically due April 15 (Q1), June 15 (Q2), September 15 (Q3), and January 15 (Q4). If you don't make sufficient quarterly payments, you may owe penalties and interest when you file. This calculator helps you estimate what you owe annually so you can divide it by four and adjust payments as needed.

Yes. After calculating your net self-employment income and subtracting half of your SE tax, your resulting Adjusted Gross Income (AGI) is then reduced by your standard deduction (or itemized deductions if they're larger) to determine your taxable income for federal income tax purposes. Self-employment income is not exempt from the standard deduction calculation.

Common deductible business expenses include: office supplies, equipment and tools, software subscriptions, professional services (accounting, legal), business insurance, home office deduction (if you have a dedicated workspace), vehicle mileage for business purposes, advertising and marketing, continuing education, and business-related travel. Keep receipts and records for all expenses. Consult a tax professional or IRS guidelines for what qualifies in your specific situation.

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Tax Disclaimer

This calculator provides estimates for educational purposes and should not replace professional tax advice. Self-employment tax rules are complex and vary based on individual circumstances, business structure (sole proprietor, LLC, S-corp), and state taxes. Consult a qualified tax professional, CPA, or tax software to file your actual tax return. The IRS provides official guidance at irs.gov.