How do I specify an employee's tax area or social security contribution area?

You don't need to enter this information directly. It's derived from the tax reporting unit (TRU) associations defined on the employee's Deduction Information calculation card.

You can associate an entire card (and thus all its calculation components) with a specific TRU, or associate individual components, such as public housing fund, with a specific TRU. The TRU associated with a calculation component determines its tax area or contribution area.