The Employee History Data (EHD) file lists all the bonus-eligible employees and their assignment details. These assignment details are used to determine which bonus scheme they belong to.
Employee History Data is used for the following:
- Calculation of bonus target or basis.
- Assignment dates in the employee history data are used to determine proration.
- Eligibility for bonus plan is determined by fields in the Employee History Data file.

The functionality supports pulling data from fields of one custom MDF object during the Import Employee History from Employee Central process for Variable Pay templates.