Tax jurisdiction lookup by point or address

The problem

• Postcodes cross city and county lines, so a postcode table charges the wrong rate at the edges.
• Jurisdictions nest: state, county, city and special districts can all apply at once.
• Auditors want to know which boundary you used and when.

With Geocode AI

1. Reverse-geocode the point

   One call returns every cached boundary that contains the coordinates, smallest first, with kind and admin level.

2. Map boundaries to rules

   Key your rate tables by our stable boundary ids (OSM relation ids), not by names that change spelling.

3. Keep the evidence

   Store the id and fetch date with each transaction; the polygon behind it can be re-fetched any time.