Enter your expected 2026 numbers and you'll get your total tax, self-employment tax included, plus the quarterly payment that avoids an underpayment penalty.
Suggested quarterly payment
$0
2026 estimate for Single or Married-filing-jointly using the standard deduction and Rev. Proc. 2025-32 figures. Simplified: no credits, itemized deductions, or the 0.9% additional Medicare surtax, and state taxes aren't included. Round up: overpaying gets refunded, underpaying gets penalized. This is not tax advice.
When to pay
2026 installments are due April 15, June 15, September 15, 2026, and January 15, 2027. Pay online via IRS Direct Pay. Add every deadline to your calendar (.ics), and if you've already missed a quarter, the penalty calculator shows exactly what it's costing and how the withholding rescue can still save you.