Tax Rates For the entire U.S., Its Territories, and Canada State, county, city, and all local taxing jurisdictions are covered. Local jurisdictions include school and water districts, rapid transit area, police jurisdictions, etc. ZIP Codes Tax information is mapped to ZIP code. All U.S. Postal Service ZIP codes, with their associated states, counties, and cities are included. In many instances counties, cities, or local taxing jurisdictions override the state rate, or each other's rate.
Some jurisdictions limit taxable sales amounts or actual tax amounts.
Some jurisdictions split their tax rates, imposing different rates below and above a given dollar amount. The dates on which current and prior rates became effective. Each ZIP code has an indicator that tells you whether it is inside, outside, or crosses city limits. Each state uses a unique rounding method when calculating taxes, creating the need for bracket schedules. This is especially true in point of sale systems involving fractions of a dollar.