Skip to content

Terms of Use

Last updated: September 30, 2026

Operator and acceptance

Quartersync is operated by Quartersync LLC. By accessing or using Quartersync, you agree to these Terms of Use.

What Quartersync Free provides

Quartersync Free provides federal estimated-tax planning for the situations described in its current coverage.

You can enter or import supported business totals, review planning estimates, track money set aside, and record estimated payments.

Required information must be complete and your situation must be supported before calculated dollar amounts are shown.

Current coverage is limited to one cash-basis Schedule C service business, with Single or supported Married Filing Jointly returns. It excludes wages, other income, dependents, credits, state and local tax, and unsupported business expenses or arrangements. Eligibility questions check these facts before calculation.

Estimates and professional advice

Results are planning estimates based on the information you provide and the situations Quartersync supports. Tax rules and official guidance may change.

Quartersync does not guarantee accuracy, tax savings, penalty avoidance, filing acceptance, payment completion, or any particular tax outcome.

Quartersync does not provide bookkeeping or professional tax, legal, accounting, or financial advice and does not replace a qualified professional.

This initial release has not received qualified professional tax review. Quartersync is not endorsed by the IRS.

Filing, payments, and your responsibilities

Quartersync does not prepare or file tax returns, submit or process tax payments, or verify payments with the IRS. You are responsible for making payments through official channels, filing returns, and meeting deadlines.

You are responsible for reviewing the information you enter and the results shown, determining whether current coverage fits your circumstances, and confirming the treatment of expenses and mileage.

Consult a qualified professional when your circumstances fall outside current coverage or you are uncertain.

Reserves and recorded payments

A suggested reserve is a planning amount. It is not an IRS requirement, safe harbor, final tax liability, or guarantee.

A recorded payment is information you enter. It is not proof that Quartersync sent, verified, or reconciled a payment.

Reminders

Reminder preferences are optional. Email reminder delivery is not currently available. Reminders do not replace your responsibility to check deadlines and take action, and delivery is not guaranteed.

Accounts, retention, and deletion

Information is retained as described in the Privacy Policy.

Self-service account deletion is not currently available. Send deletion requests to support. Deletion of live records does not guarantee immediate removal from existing backups.

Availability and changes

Quartersync may be changed, suspended, limited, or discontinued. We do not guarantee response or resolution times, uptime, reminder delivery, or continuous availability.

Planned Quartersync Pro features are not currently available. Published plans do not guarantee a particular feature, price, coverage, or release date.

Contact

For questions about these terms, contact support@quartersync.com. Do not send sensitive tax, financial, or sign-in information.