If a city overlaps county and state boundaries

GeoCodes are effective because of their geographical boundary flexibility. Because some cities cross over county and state boundaries, the use of city, county, state, and postal codes to assign tax authorities can be limiting. GeoCodes can calculate taxes precisely, even if the tax location is in more than one county or state. So if your company does business with companies in many other cities, GeoCodes are an effective method for assigning your customers to tax authorities.