Estimated Tax Calculator
US, 2025 tax year · figures follow that year's rules
Estimated tax calculator works out Self-employment tax and Social Security portion from Net self-employment earnings, W-2 wages already earned this year and Tax year. The default figures on this page give self-employment tax of 11,303.64; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
5 steps
- Net earnings subject to SE tax = 80000 x 0.9235 = 73880
- The full 176100 Social Security base is available.
- Social Security portion at 12.4% = 9161.12
- Medicare portion at 2.9% = 2142.52
- Total self-employment tax = 11303.64; half of the regular portion (5651.82) is deductible.
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
5 sources
Keep this result
Save it, change one figure, then compare the two
The calculation stays free. Save this scenario, adjust one assumption, save that too, and put them side by side to see exactly what the change costs you. A free account keeps 5 scenarios and 2 comparisons; Personal makes both unlimited and adds exports and private links. Nothing is saved unless you press Save.
What the estimated tax calculator calculates
Computes SE tax on net self-employment earnings, the deductible employer-equivalent half, and the resulting quarterly estimated payments.
How to use this estimated tax calculator
Enter Net self-employment earnings, W-2 wages already earned this year, Tax year and Filing status. Self-employment tax updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Self-employment tax, Social Security portion and Medicare portion.
The method follows IRS Schedule SE (Form 1040), Self-Employment Tax, IRS Revenue Procedure 2024-40, inflation-adjusted items for tax year 2025, IRS Revenue Procedure 2025-32, modifying Rev. Proc. 2024-40 for the One Big Beautiful Bill ACT (P.L. 119-21), IRS, Federal income tax rates and brackets and Social Security Administration, Contribution and Benefit Base.
80,000 of net earnings in 2025 example
With Net self-employment earnings: 80000, Tax year: 2025, the calculator returns Net earnings subject to SE tax: 73880, Self-employment tax: 11303.64. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Self-employment tax, Social Security portion and Medicare portion. The inputs you can vary are Net self-employment earnings, W-2 wages already earned this year, Tax year and Filing status.
Understanding Self-employment tax, Social Security portion and Medicare portion
An estimate. Confirm with a tax professional before making estimated payments.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
How do I know how much estimated tax I need to pay?
On the figures this page opens with — net self-employment earnings 80,000 USD — the self-employment tax is 11,303.64. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
What information do I need for the estimated tax calculator?
You need Net self-employment earnings, W-2 wages already earned this year, Tax year and Filing status. The page opens with default figures that give self-employment tax of 11,303.64, so you can see the scale before entering your own.
What does this estimated tax calculator show?
It shows Self-employment tax, Social Security portion, Medicare portion, Additional Medicare, Net earnings subject to SE tax, Deductible half of SE tax, Estimated quarterly payment and Effective SE tax rate, with the working and any warnings for your entries.
Can I check how the estimated tax calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.