Estimated tax safe harbor calculator

Compute the minimum federal estimated tax payments to avoid the underpayment penalty — using the lesser of 90% of current year or 100/110% of prior year.

Prior year total tax

Current year projected tax

Current year W-2 withholding

Prior year AGI

>$150k AGI requires 110% of prior year for safe harbor.

Quarterly estimated payment

Show the work

Total required payments$32,800
Safe harbor target$37,800
Prior year multiplier (100% or 110%)1