Add or Update Employee Deduction.

This assigns a Section 125 or post tax deduction to an employee and manages deduction amounts across effective dated periods. It supports setting an initial amount with a start date, revising the deduction by creating a new effective period, updating an existing period, closing the current period, or beginning a new period with a different amount.

Notes:

• Garnishments and 401k deductions are excluded.
• If multiple periods need to be created for the same employee, each period must be submitted in a separate request
• The system maintains a clean non overlapping timeline across all effective periods and automatically adjusts future periods when needed to preserve continuity

Effective period behavior:

• When creating or updating a deduction period, the system ensures periods never overlap
• When a new period falls between two existing periods, it fills the available gap.
• When a new period overlaps a future period, the system automatically shifts the future period start date to the day after the new period ends.
• When a new period has no end date and would overlap a future period, the system automatically sets the end date to the day before the next period begins.