getSalesTaxFiling

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PREMIUM ONLY - Business tier and above; requests below that return an error. Filing frequencies and due dates by US state. Calendars are GENERATED from each state's published rules, so all state due dates stay correct across years. Handles what a naive 'due on the 20th' model gets wrong: due days ranging from the 15th (Maine) to the last day of the month (California); New York's quarters ending Feb/May/Aug/Nov; weekend and holiday rollover against federal, state or both calendars, flagged with due_date_adjusted and preserving statutory_due_date; electronic payments that must be INITIATED a business day early (Florida); and prepayment regimes in the four distinct placements states actually use. Supply annual_liability to have the state's own ladder assign a frequency. Where a state grants frequency by written approval or departmental notice rather than by a published dollar threshold, the response is 'indeterminate' rather than a guess. Each jurisdiction carries coverage_level, and any field the state does not publish is listed in unpublished with an unpublished_reason. State-level filing regimes only; home-rule localities that file separately are out of scope. This is reference data, not tax advice.