Self-Employment Tax Calculator

Description

The Self-Employment Tax Calculator helps freelancers, independent contractors, sole proprietors, and other self-employed individuals determine their self-employment (SE) tax liability for the current tax year. Unlike W-2 employees whose employers withhold and match Social Security and Medicare taxes, self-employed individuals must pay both the employee and employer portions of these taxes — a combined rate of 15.3% consisting of 12.4% for Social Security and 2.9% for Medicare. This calculator walks you through the complete SE tax computation, starting with your net self-employment income from Schedule C (or other self-employment sources), applying the 92.35% factor that simulates the employer-equivalent deduction, calculating the Social Security component up to the annual wage base limit, computing the Medicare component on all earnings with no cap, adding the Additional Medicare Tax of 0.9% for high earners, and determining the deductible half of SE tax that reduces your adjusted gross income on Form 1040. The calculator also accounts for situations where you have both self-employment income and W-2 wages, properly coordinating the Social Security wage base between the two income sources to avoid over-calculation. For cross-border self-employed individuals, the calculator includes an option to account for Totalization Agreement exemptions that may reduce or eliminate SE tax on foreign self-employment income earned in treaty partner countries. This tool is essential for any self-employed individual who needs to understand their total tax burden, plan for quarterly estimated payments, and make informed decisions about business structure, retirement contributions, and tax planning strategies.

Input Fields

Formula Explanation

Self-employment tax is calculated as follows: (1) Multiply net SE income by 92.35% to get the SE tax base. (2) Apply 12.4% Social Security tax on the SE tax base up to the Social Security wage base minus any W-2 wages. (3) Apply 2.9% Medicare tax on the entire SE tax base. (4) Add 0.9% Additional Medicare Tax on combined SE and W-2 income exceeding $200,000 (single) or $250,000 (MFJ). (5) The deductible half of SE tax equals 50% of the total SE tax calculated.

Example Calculation

Frequently Asked Questions