getSalesTaxHolidays

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Sales tax holidays for US states, with timezone-aware start and end timestamps, eligible item categories and per-item price caps. Supply a date, category and amount to get an exemption determination for a single purchase. Where a state lets each locality opt in or out, the endpoint returns exempt: null with determination: 'indeterminate' and a required_input array rather than a flat true, because participation is not decidable from the state alone. Price caps are per item in most states, not per transaction; cap_basis says which. Asking for a year the state has not yet published returns an empty result set with a coverage note, not an error and not last year's dates. This is reference data, not tax advice.