Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Each quarterly payment
$6,543
Total annual tax
$26,173
Self-employment tax
$11,304
Federal income tax
$11,152
State income tax
$3,717
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How to use this
- 1Enter expected annual net profit ($).
- 2Enter other w-2 income ($).
- 3Enter effective income tax rate (%).
- 4Enter state tax rate (%).
- 5Read your each quarterly payment on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Self-employed income has no withholding, so you pay four times a year. This estimates income tax plus self-employment tax and splits it into quarters.
Worked example
Using the values the calculator loads with:
Inputs
- Expected annual net profit: 80000 $
- Other W-2 income: 0 $
- Effective income tax rate: 15 %
- State tax rate: 5 %
Results
- Each quarterly payment: $6,543
- Total annual tax: $26,173
- Self-employment tax: $11,304
- Federal income tax: $11,152
- State income tax: $3,717
What each field means
Inputs
- Expected annual net profit ($)
- The expected annual net profit used in the calculation, measured in $. Starts at 80000 $ so you have a working example on load.
- Other W-2 income ($)
- The other w-2 income used in the calculation, measured in $. Starts at 0 $ so you have a working example on load.
- Effective income tax rate (%)
- The effective income tax rate used in the calculation, measured in %. Starts at 15 % so you have a working example on load. Accepted range: 0–50 %.
- State tax rate (%)
- The state tax rate used in the calculation, measured in %. Starts at 5 % so you have a working example on load. Accepted range: 0–15 %.
Results
- Each quarterly payment
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total annual tax
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Self-employment tax
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Federal income tax
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- State income tax
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the quarterly estimated tax calculator work?
Self-employed income has no withholding, so you pay four times a year. This estimates income tax plus self-employment tax and splits it into quarters. The underlying maths is: SE tax on 92.35% of profit + income tax on profit − half SE tax
What do I need to enter?
4 values: expected annual net profit, other w-2 income, effective income tax rate, and state tax rate. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the each quarterly payment result mean?
It is returned as a money amount in US dollars and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Who is this tool for?
It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Quarterly Estimated Tax Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/quarterly-tax-estimate
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/quarterly-tax-estimate" target="_blank" rel="noopener">Quarterly Estimated Tax Calculator — RevenueLab</a> (2026).</p>
Source: [Quarterly Estimated Tax Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/quarterly-tax-estimate) (2026).