One number. Zero stress.
The single-screen quarterly estimated tax tracker for freelancers. Enter what you earned. See what to set aside. Get reminded before the deadline.
Launching ahead of the September 15 estimated tax deadline.
How it works
Add what you've earned so far this quarter. Nothing else — no receipts, no categories, no mileage.
QuarterZen calculates your estimated federal and self-employment tax as you go, so the number is always current.
Notifications 14 days and 3 days before each of the 4 IRS deadlines, so the number finds you.
Pricing
Calculate your current quarter's estimate, always, at no cost.
or $29.99/yr — save 50%
Billed through the Apple App Store or Google Play, whichever you download from. Cancel anytime from your store account — QuarterZen never sees or stores your payment details.
Honest Boundaries
Radical simplicity. No mileage, no invoicing, no bank linking — ever.
The number updates live as income is entered. Never a stale estimate.
You enter your income yourself. Nothing connects to your accounts.
QuarterZen gives you an estimate based on what you enter. It's not a substitute for a tax professional, and it doesn't file anything on your behalf.
FAQ
No. QuarterZen gives you an estimate to help you plan, based on the numbers you enter. For anything beyond a rough estimate, talk to a tax professional.
Never. You enter your income yourself. QuarterZen doesn't request, store, or have access to any bank credentials.
Yes — see our Privacy Policy for exactly what's collected and how it's handled.
Billing runs entirely through the Apple App Store or Google Play. You can cancel anytime from your store account settings — QuarterZen never handles your payment info directly.
V1 uses a flat-rate estimate rather than full state-by-state modeling. Full state support is on the roadmap.
One number, updated live, with reminders before every deadline.