Step 1: determine business profit
Reconcile income and subtract allowable business expenses. A rough percentage of revenue cannot replace this step.
Freelancer tax guide
How to Calculate Self-Employment Tax
Follow the Schedule SE sequence from business profit to Social Security and Medicare tax, including wage-base coordination.
Complete the business schedules first, combine qualifying net earnings, apply the current Schedule SE net-earnings factor, and calculate the Social Security and Medicare components under the filing-year limits.
Step 2: complete Schedule SE
Use the current filing-year form to calculate net earnings and the Social Security and Medicare portions. Wages already subject to Social Security tax affect how much wage base remains.
Step 3: include the result in planning
Add self-employment tax to the projected regular income tax and other taxes, then subtract credits, withholding, and payments. Also include the employer-equivalent adjustment where the return allows it.
Questions & answers
Can I multiply profit by one rate?
That shortcut can miss the Schedule SE net-earnings factor, wage-base coordination, and additional Medicare rules.
Do W-2 wages matter?
Yes. They may use part or all of the annual Social Security wage base before self-employment earnings are considered.
Official sources
Educational information only. Tax rules and filing details change; verify the filing-year instructions or work with a qualified tax professional.
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