United States · Federal tax
Quarterly estimated tax calculator.
Start with your expected federal tax, subtract withholding and payments already made, then split the remaining amount into four equal planning installments.
Your amounts
Planning result
How this estimate works
The calculator subtracts expected federal withholding and payments already made from your expected federal tax, then divides any positive balance by four. It does not apply the annualized-income installment method, prior-year safe harbor, credits, penalties, self-employment tax, state tax or special exceptions.
Official source: IRS Publication 505 explains estimated tax and penalty rules. See the 2026 due-date reference for the payment schedule.
Planning estimate only
Use Form 1040-ES or a tax professional to determine required installments. This result is not tax advice and cannot confirm penalty protection.