Free estimated quarterly tax calculator
Enter your expected income, deductions, and prior-year tax — this quarterly estimated tax calculator shows each 2024 payment amount and confirms your safe-harbor threshold, updated live, as you type.
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Estimated only. Actual withholding depends on your W-4 elections, filing status, and local laws. Consult your payroll provider for exact figures.
Results are estimates. Consult a professional.
How the estimated quarterly tax calculator works
The US tax system is pay-as-you-go: income tax is due when income is earned, not just when you file in April. For employees, employers do this automatically through payroll withholding. For the self-employed, freelancers, investors with dividends or capital gains, and anyone whose withholding is insufficient, the IRS requires quarterly estimated tax payments. The calculator figures out how much to send and when.
Worked example: freelance consultant with no withholding
Taylor is a single freelance consultant with $95,000 in expected net self-employment income for 2024 and no W-2 withholding. Taylor's prior-year tax was $28,000 and prior AGI was $112,000 (below $150,000, so the 100% safe harbor applies). Here is exactly how Taylor's quarterly payments are calculated.
2024 quarterly due dates and safe-harbor payments
The table below shows the four 2024 payment deadlines and illustrative quarterly payment amounts based on total expected tax, using the current-year method (÷ 4). Safe-harbor amounts shown assume prior AGI ≤ $150,000; if your prior AGI exceeded $150,000 multiply the prior-year tax by 110% before dividing by 4.
| Due date | Period covered | $50k expected tax | $75k expected tax | $100k expected tax | $150k expected tax |
|---|---|---|---|---|---|
| April 15, 2024 | Jan 1 – Mar 31 | $12,500 | $18,750 | $25,000 | $37,500 |
| June 17, 2024 | Apr 1 – May 31 | $12,500 | $18,750 | $25,000 | $37,500 |
| September 16, 2024 | Jun 1 – Aug 31 | $12,500 | $18,750 | $25,000 | $37,500 |
| January 15, 2025 | Sep 1 – Dec 31 | $12,500 | $18,750 | $25,000 | $37,500 |
Source: IRS Form 1040-ES (2024) payment vouchers. Amounts shown are equal-quarter estimates using the current-year method. Annualized income installment method (Schedule AI) may allow unequal payments for uneven income.
Tips for estimated quarterly tax payments
Getting quarterly payments right requires a little planning at the start of the year and a mid-year check-in. These five practices keep freelancers and investors out of penalty territory.
- Default to the prior-year safe harbor if your income is unpredictable. Paying 100% of last year's tax (or 110% if prior AGI exceeded $150,000) in four equal installments fully protects you from the underpayment penalty — even if you end up owing much more at filing. It removes guesswork when income swings are hard to forecast.
- Use the annualized income installment method for lumpy income. If you earn most of your income in Q3 (say, from a large project or capital gain), Schedule AI lets you pay more later and less earlier without incurring a penalty for the underpaid early quarters.
- Set aside 25–30% of every invoice or freelance payment into a separate savings account. Transfer it immediately so it is never mentally available to spend. This creates a self-funded quarterly tax reserve that keeps cash flow predictable.
- Adjust payments immediately after a major income change. A large unexpected client, a big capital gain, or a real-estate sale can push you into a higher bracket mid-year. Recalculate your total estimated tax and increase Q3 or Q4 payments to catch up.
- Pay online via IRS Direct Pay or EFTPS — never mail a paper check without tracking. Electronic payments post instantly and generate a confirmation number. Missing a deadline by even one day starts penalty interest; online payment eliminates USPS delivery risk.
Accuracy and limitations
This calculator estimates quarterly payments using the equal-installment method (total ÷ 4) and applies the 2024 self-employment tax rate of 15.3% on net earnings up to $168,600 (Social Security wage base), then 2.9% (Medicare only) above that. It uses 2024 standard deductions and income tax brackets. It does not calculate state estimated taxes — most states that have income tax require separate quarterly payments on their own schedule.
The calculator does not model the annualized income installment method (Form 2210, Schedule AI), which can reduce required payments in early quarters if income is back-loaded. If your income varies widely by quarter, consult IRS Form 2210 instructions or a tax professional. The underpayment penalty rate changes each quarter; the calculator uses the current IRS rate (federal short-term rate + 3%) as a planning estimate.
Estimated tax terms defined
About this estimated quarterly tax calculator
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