Professional services
Quarterly Tax Calculator
Quarterly estimated payments, including the safe harbour amount that avoids penalties.
Result
Not tax advice, and not a filing calculation. This estimates what to set aside using rates you supply. Brackets, thresholds, deductions, credits and state rules change every year and interact with the rest of your return in ways no single calculator models. Confirm anything that affects a payment or a filing with an accountant. Safe harbour rules let you avoid an underpayment penalty by paying a set percentage of the prior year's tax even if you end up owing more, which is useful when income is unpredictable. The percentage rises for higher incomes and the rules change; confirm the current figures. Payment deadlines are not evenly spaced across the year.
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About this calculator
What is the safe harbour?
Paying a specified percentage of last year's total tax generally avoids an underpayment penalty regardless of what you actually owe. It is valuable when this year's income is hard to predict.
What happens if I skip a quarter?
Penalties accrue by quarter, so catching up in December does not undo an underpayment from April. The penalty is calculated period by period.
Are the quarters evenly spaced?
No. The due dates are not three months apart and the payment periods differ in length, which surprises people the first year.
The formula
required = the lower of projected tax and the safe harbour percentage of last year's tax, less withholding
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