Use tax zones to group existing geographical regions that share the same tax requirement. You can use tax zones with tax regimes, to identify tax requirements for a special geographic area and to create parent tax regimes that represent a related grouping of geographic regions for tax reporting purposes. You can also use tax zones
with tax rules, to create tax rules that refer to a specific geographic location.

The use of tax zones is optional and depends on your overall tax setup planning. For example, if a separate economic community exists in part of a country only, you can either set up a tax zone and corresponding tax regime for the applicable geographic area, or set up a country tax regime and use applicability rules to exclude the parts of the country where the tax requirement does not apply.

The tax zone setup makes use of the Trading Community Architecture (TCA) master reference geography hierarchy. The master reference geography hierarchy identifies the hierarchical structure of a country, such as Country: State: County: City: Postal Code in the United States, and identifies which levels are mandatory for the tax zone. A tax zone
type references a specific part of a master reference geography hierarchy. You create tax zones within a tax zone type to uniquely identify tax requirements within the area defined by the tax zone type.

You can update the information in a tax zone at any time. You can also update the geographic information in a tax zone type, as long as the tax zone type does not contain tax zones. If you apply an end date to a geographic entity in TCA, then this removes all tax zones and tax zone types associated with the entity.