1099 Quarterly Tax Estimator

Know what to set aside, and never miss an IRS deadline. Free forever — no account, no card.

Built on the IRS safe harbor rule: pay 100% of last year's tax across the four payments (110% above $150,000 AGI) and the IRS cannot charge an underpayment penalty, however much you earn this year. The app works that number out in about 60 seconds of setup.

The main screen showing the amount to set aside for the quarter and the days left until the deadline — One number, and the date it is due

A year overview screen listing the four quarters with their deadlines and status — Four deadlines, and where each one stands

Free forever

Your quarterly set-aside number — safe harbor, or projected from the income you log
Every IRS deadline with a countdown, plus three factual reminders per quarter (two weeks, three days, due day)
Your state's own deadlines when they differ from the IRS — Virginia asks by May 1, Delaware April 30, Hawaii on the 20th, Iowa at month end
Income log with CSV import and export
Year overview with paid and upcoming status

What Premium adds

Your state's tax folded into every quarterly figure
The state rules that change the amount: California splits the year 30/40/0/30 instead of four equal payments, and the point where a state starts asking varies — South Carolina at $100, New York at $300, while the IRS waits for $1,000
Income tracked by client

$4.99 / month · $29.99 / year · $59.99 once. The core number is never part of the purchase.

Every state, checked at the source

A state is only covered once its rules have been checked against that state's own tax authority — not a summary site. Every income-tax state except Connecticut is covered today: 40 states plus the District of Columbia. Where a state is not covered, the app says so plainly and does not charge for it, and the federal figure keeps working for free.

Idaho and Utah do not ask individuals for quarterly estimated payments at all, so the app says that instead of showing deadlines that do not exist.

Private by design

There is no account, no sign-up and no server. Every calculation runs on your device and nothing you enter leaves your phone. See the privacy policy for the detail.

Not a filing tool

The app estimates what to set aside and reminds you when it is due. Your accountant or filing software still handles the actual return. Estimates only — not tax advice.