Free Tax Tool
Check whether you meet the IRS safe harbor for 2026, estimate your underpayment penalty by installment period, and see how payment timing or extra withholding changes the math. Want the full rules? Read our Safe Harbor guide.
Enter your email to unlock the detailed calculator: the quarter-by-quarter penalty table and the what-if tools (estimated payment vs. extra withholding). You can keep editing the numbers afterward.
Enter a valid email to unlock.
Your accountant doesn't need to be local. Fraim CPA is based in Virginia and works with clients in all 50 states, fully remote.
We'll only use your email to follow up about your results.
Your accountant doesn't need to be local. Fraim CPA is based in Virginia and works with clients in all 50 states, fully remote.
See how remote tax prep works →Tell us a bit about your situation and a Fraim CPA will review it with you. No obligation.
We have your details and your safe-harbor scenario.