Self-Employment Tax & Estimated Payment Calculator

First, multiply your net self-employment income by 92.35% (this accounts for the deductible half of SE tax). This is your SE tax base. Then apply 12.4% for Social Security (up to the $168,600 wage base) and 2.9% for Medicare (no cap). If your income exceeds $200,000 ($250,000 married), add 0.9% Additional Medicare on the excess. Half of your total SE tax is deductible as an above-the-line adjustment on Form 1040, Schedule 1, Line 15.

Yes, if you expect to owe more than $1,000 in tax after subtracting withholding and refundable credits. Most self-employed individuals need to pay quarterly. The due dates are: April 15 (Q1), June 15 (Q2), September 15 (Q3), and January 15 of the next year (Q4). You can avoid underpayment penalties by paying either 90% of your current year tax liability or 100% of your prior year tax liability (110% if your prior year AGI was over $150,000).

Yes. One of the most important deductions for self-employed individuals is the deductibility of half of your self-employment tax. This deduction is taken as an above-the-line adjustment to income on Schedule 1 of Form 1040. It reduces your adjusted gross income (AGI) without needing to itemize. For example, if your total SE tax is $12,000, you can deduct $6,000 directly from your gross income, which also reduces your income tax liability.

Self-employment tax and income tax are two separate taxes. SE tax funds Social Security and Medicare - it's calculated on your net self-employment income at 15.3%. Income tax is calculated on your total taxable income (including both SE and other income) using progressive tax brackets (10%, 12%, 22%, 24%, 32%, 35%, 37% for 2024). You pay both taxes, and they are reported on separate parts of your tax return. The SE tax is calculated on Schedule SE and reported on Schedule 2, while income tax is calculated using the Tax Tables or Tax Computation Worksheet.

If you fail to make timely estimated tax payments, you may be subject to an underpayment penalty (Form 2210). The penalty is calculated based on the amount of underpayment and the number of days it was unpaid, using the current federal short-term interest rate plus 3%. The IRS may waive the penalty if the underpayment was caused by a casualty, disaster, or other unusual circumstance, or if you retired (after age 62) or became disabled during the tax year.

Absolutely. This calculator runs 100% in your browser. Your income data, filing status, and tax projections are processed locally on your device and are never sent to any server, stored, or tracked. No signup or account is needed.

Yes - this calculator is 100% free with no signup, no account, and no usage limits. Run as many scenarios as you need with different income levels, filing statuses, and deduction assumptions, completely free forever.