HesapHanem

Quarterly Estimated Tax Calculator

Enter income, rate and withholding to size each quarterly payment.

How it is calculated

The tool applies one flat rate to the income you enter: annual tax = income × rate ÷ 100, with the rate as a percentage (22 means 22%). It then subtracts tax already withheld: owed = max(0, annual tax − withheld), so an over-withheld year shows zero rather than a negative number. Each instalment is owed ÷ 4. Amounts are shown in dollars. There are no brackets, deductions, credits or self-employment tax in the calculation, and the real due dates are not evenly spaced. Treat the rate as your own estimated effective rate on the income you enter, and check the rules of your tax authority, since requirements and safe-harbour thresholds differ by country.

Worked example

Expected income 80,000 at an effective rate of 22%, with 2,000 already withheld. Annual tax: 80,000 × 22 ÷ 100 = $17,600.00. Owed after withholding: 17,600 − 2,000 = $15,600.00. Four equal payments: 15,600 ÷ 4 = $3,900.00 per quarter. If withholding had been 20,000 instead, owed would be capped at $0.00 and the quarterly payment shown would be $0.00.

Try this example →

Common mistakes

  • Typing the rate as a decimal such as 0.22. The field is in percent, so 0.22 means 0.22% and the tax comes out a hundred times too small.
  • Using the top marginal bracket rate instead of an effective rate. Bracketed tax on the whole income is lower than the top rate times everything.
  • Entering gross revenue rather than expected taxable income after business expenses and deductions.
  • Forgetting that this model leaves out self-employment or social-security contributions, which freelancers usually owe on top of income tax.
  • Assuming a negative balance means a refund: the result floors at zero, it never shows money coming back.

About this calculator

In the US, taxpayers who don't have enough tax withheld automatically from a paycheck — self-employed people, freelancers, and small business owners chief among them — are required by the IRS to pay estimated tax in four installments throughout the year (roughly mid-April, mid-June, mid-September, and mid-January) rather than settling the whole bill at filing time, using Form 1040-ES as the standard worksheet. The math is straightforward: estimated annual tax minus any withholding, divided into four equal payments, though the actual due dates aren't perfectly quarterly.

This calculator takes your expected annual income, effective tax rate, and any withholding already covered, and sizes each quarterly payment. Freelancers, gig-economy workers, independent contractors, and small business owners use it to budget for tax payments throughout the year and avoid the IRS underpayment penalty that applies when too little is paid before the deadline.

Was this helpful?

You can pick up to 3 reactions.

Comments (1)

  • Editorial team

    The rate you type decides this result. A reasonable way to find your own effective rate is to take last year's total tax from your return and divide it by last year's taxable income, then enter that percentage here. The tool applies a single flat rate and no country's rules, so use it for planning the size of each instalment, not for filing. What kind of income are you setting money aside for?

Popular calculators

Loan Calculator

Monthly payment, total interest and full amortization schedule.

Percentage Calculator

Percent change, percent of, and ratio calculations.

Discount Calculator

Calculate final price, savings, and discount amount.

BMI Calculator

Body mass index from height and weight (metric or imperial).

Age Calculator

Compute your exact age in years, months and days from a birth date.

Compound Interest Calculator

Calculate the final amount and interest earned with compounding.

All Calculators