Terms of use

Quartersafe is provided “as is”. It applies Form 1040-ES and Form 2210 (with Schedule AI) to the income and expenses you provide. It is not tax or legal advice and doesn't pay or file anything. It can't tell whether your records are complete or whether an expense is deductible, and it doesn't cover state taxes, credits or every federal tax. You remain responsible for your tax payments and returns. Quartersafe is not affiliated with, endorsed by or sponsored by the IRS or any tax software company.

Free plan

The free plan lets you check files of any size and see the estimate, the safe harbor, both methods' installments, every check and part of the Schedule AI worksheet.

Pro

Pro is licensed per person. Subscriptions renew automatically until cancelled; the 7-day pass expires after 7 days. Refunds are available within 14 days if Quartersafe can't read your file or adds up your income or expenses incorrectly.

Acceptable use

Don't resell or redistribute license keys.

Trademarks

Excel and other names are trademarks of their respective owners. Products named on comparison pages are mentioned only for comparison; Quartersafe is not affiliated with, endorsed by or sponsored by any of them.

Last updated: 2026-10-28