Quarterly Estimated Tax Calculator
Find your quarterly estimated tax payment.
Enter your values
Enter the projected annual net self-employment income in $.
Enter the estimated effective income tax rate in %.
Enter the self-employment tax rate in %.
Enter the se tax deduction adjustment in % of net income subject to SE tax.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Self-employment tax
- $12,716.60
- Estimated income tax
- $16,200.00
- Total annual tax estimate
- $28,916.60
- Quarterly payment
- $7,229.15
Quick answer
Estimated taxes are typically paid in four installments through the year, based on projected income tax plus self-employment tax on net self-employment earnings.
Quarterly payment = (income tax + SE tax) / 4
At a glance
| What it does | Find your quarterly estimated tax payment. |
|---|---|
| Category | Finance |
| Inputs needed | Projected annual net self-employment income, Estimated effective income tax rate, Self-employment tax rate, SE tax deduction adjustment |
| Main output | Self-employment tax |
| Formula | Quarterly payment = (income tax + SE tax) / 4 |
| Cost | Free — no sign-up, no download |
How to use the Quarterly Estimated Tax Calculator
- 1Enter your projected annual net self-employment income.
- 2Enter your estimated effective income tax rate and the self-employment tax rate (15.3% covers Social Security and Medicare).
- 3Divide the total by four for each quarterly payment, due on the IRS's quarterly deadlines.
Inputs explained
- Projected annual net self-employment income($)
- Enter the projected annual net self-employment income in $.
- Estimated effective income tax rate(%)
- Enter the estimated effective income tax rate in %.
- Self-employment tax rate(%)
- Enter the self-employment tax rate in %.
- SE tax deduction adjustment(% of net income subject to SE tax)
- Enter the se tax deduction adjustment in % of net income subject to SE tax.
Worked example
Using the values the calculator loads with:
Inputs
- Projected annual net self-employment income90000 $
- Estimated effective income tax rate18 %
- Self-employment tax rate15.3 %
- SE tax deduction adjustment92.35 % of net income subject to SE tax
Results
- Self-employment tax$12,716.60
- Estimated income tax$16,200.00
- Total annual tax estimate$28,916.60
- Quarterly payment$7,229.15
Frequently asked questions
What happens if I underpay?
The IRS can charge an underpayment penalty unless you meet a safe harbor, such as paying 100-110% of last year's total tax.
Can I deduct half of self-employment tax?
Yes — half of SE tax is deductible from income for federal income tax purposes, which this calculator approximates via the adjustment factor.
What do I need to enter into the Quarterly Estimated Tax Calculator?
Just 4 values: projected annual net self-employment income, estimated effective income tax rate, self-employment tax rate, se tax deduction adjustment. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Quarterly Estimated Tax Calculator work out the answer?
Estimated taxes are typically paid in four installments through the year, based on projected income tax plus self-employment tax on net self-employment earnings. It applies the formula Quarterly payment = (income tax + SE tax) / 4 and shows the working so you can check each step by hand.
Is the Quarterly Estimated Tax Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.