Estimated Tax Calculator (US)

This estimated tax calculator helps freelancers, contractors, business owners, investors, and people with untaxed income estimate annual tax and quarterly payment needs.

Estimated tax planning matters when tax is not fully withheld from wages. That can happen with self-employment income, investment income, rental income, side income, or major changes in deductions and credits.

If your projected annual tax liability is $18,000 and $6,000 will be withheld from wages, the remaining $12,000 may need to be covered through estimated payments. Split evenly, that is about $3,000 per quarter.

The exact safe payment can depend on prior-year tax, current-year income, withholding, credits, and IRS safe harbour rules.

Waiting until tax filing season can create a cash crunch if income has grown or withholding has been too low. Quarterly planning spreads the cost and helps reduce the chance of underpayment penalties.

Estimated payments are especially useful when income is uneven. Recalculating after a strong quarter can prevent a large surprise later.

Update the estimate when income changes, keep a separate tax savings account, and compare projected payments with actual year-to-date withholding.

This calculator is a planning aid. Confirm payment deadlines, safe harbour rules, and state requirements with IRS guidance or a tax professional.

Use this calculator to turn annual business income, expenses, tax already paid, an estimated tax rate, and payments remaining into a per-payment estimate.

The component does not calculate IRS safe harbour, exact quarterly due dates, or a full tax return. It uses the rate you enter to estimate annual tax.

Use self-employment tax first when you need a self-employment tax and net-profit estimate before sizing payments.

Use tax withholding when W-2 withholding is the main payment source and you want to compare withholding with annual federal tax.

Label saved scenarios with the tax rate and number of payments remaining, because those two assumptions drive the per-payment amount.

Treating the entered tax rate as if the calculator has derived it from brackets, credits, or self-employment tax rules.

Forgetting to subtract tax already paid or withheld before splitting remaining payments.

Leaving payments remaining at four late in the year, which can understate the amount needed per remaining payment.

Forgetting state estimated payments when this page is only being used for a simplified federal-style estimate.

Using this page as a penalty or safe-harbour calculator. Those rules are outside the component.

Example: enter $80,000 of business income, $15,000 of expenses, $0 already paid, a 22% estimated tax rate, and 4 payments remaining.

The calculator estimates taxable income, annual tax, remaining tax after payments already made, and the amount for each remaining payment.

If one payment has already been made, reduce payments remaining or add the amount already paid so the remaining payment estimate stays realistic.

Change income and expenses as the year develops rather than relying on the first projection.

Use self employment tax to estimate self-employment tax and take-home from net profit.

Use federal income tax when you need a bracket-based federal income tax estimate before choosing a manual rate here.

Use tax withholding when withholding and estimated payments need to be compared against one expected annual tax figure.

Use state tax separately if state estimated payments matter.

Check whether the tax rate you entered includes income tax, self-employment tax, and any other tax layers you intended.

Check whether payments already made include both estimated payments and withholding.

Check actual IRS and state due dates before sending payments.

Rerun this estimated tax calculator when business income, expenses, tax already paid, estimated rate, or payments remaining changes.

Recheck after a strong or weak quarter so the next payment is based on the newest income picture.

If this estimate differs from tax software, trace the manual tax rate, deductions, already-paid amount, and payment count separately.