SafeHarbor calculates your exact estimated quarterly tax — self-employment tax, safe-harbor rules, and state estimates included. Enter your numbers, get four dated payment amounts and a printable voucher summary.
✓ Works instantly in your browser — no account needed
Get the precise amount to send for each due date, so you avoid IRS underpayment penalties without tying up cash you don't owe.
SafeHarbor applies the 90%/100%/110% safe-harbor rules automatically, so you know the minimum you can pay and stay penalty-proof.
Walk away with four dated payment amounts and a clean one-page summary you can print, save, or hand to your bookkeeper.
Type in your expected income, deductions, filing status, and state.
SafeHarbor runs SE tax, income tax, safe-harbor, and state estimates instantly.
Get four dated payment amounts and a printable summary — ready to send.
One-time payment. No subscription, no login, no spreadsheet gymnastics.
Get Instant Access — $19✓ Works instantly in your browser — no account needed
SafeHarbor is an estimating tool that applies published IRS self-employment and safe-harbor rules to the numbers you enter. It gives you a well-grounded estimate to work from, but it isn't a substitute for a CPA on complex situations.
No. It runs entirely in your browser and works instantly after purchase — no login, no download, no setup.
Yes. You can add a state estimate so your four quarterly payment amounts reflect both federal and state obligations.