Sales tax filing frequencies and due dates: why state schedules differ

The California Department of Tax and Fee Administration (CDTFA) lists five sales and use tax filing frequencies: quarterly prepayment, quarterly, monthly, fiscal yearly, and yearly. It says the frequency is assigned based on reported sales tax or anticipated taxable sales at registration. The CDTFA filing-dates page provides a separate calendar for each basis.

For example, CDTFA’s published calendar shows a standard quarterly return for April through June due July 31 and a yearly sales tax return for January through December due January 31. The quarterly-prepayment basis also has interim prepayment dates. If a listed due date falls on a weekend or state holiday, CDTFA says it moves to the next business day.

The Florida Department of Revenue says most new businesses are set up to file quarterly, while the filing-frequency table also lists monthly, quarterly, semiannual, and annual schedules according to annual sales tax collections. See the agency’s Florida Sales and Use Tax page for its current frequency information.

The Florida Department of Revenue states that returns and payments are due on the first day of the month following a reporting period and are late after the 20th. Its examples say a monthly January period is due February 1, while a January–March quarterly period is due April 1. The agency also lists a separate timing rule for electronic payments, so the applicable instructions should be checked directly.

For Form ST-1, the Illinois Department of Revenue says filing frequency is based on initial registration and annual liability. Its guidance describes monthly, quarterly, and annual filing schedules. The agency’s Form ST-1 requirements state that returns are due by the 20th day of the month after the reporting period ends; quarterly filers use the 20th after the calendar quarter. Weekend and state-holiday due dates move to the next business day.

“Monthly” or “quarterly” alone does not identify a complete deadline. The reporting period, the agency-assigned frequency, payment timing, and calendar adjustments can all matter. The examples above are not a complete state-by-state schedule and do not tell any particular seller which filing requirement applies.

Check the state agency’s current instructions and the schedule assigned to the relevant account. Confirm the details with a qualified tax professional when you need help interpreting your obligations.