Creates a new deduction table entry for the employee. On success, returns the new entry id. The combination of effectiveDate and deduction must be unique per employee; duplicate pairs are rejected. Creating or updating entries may also sync current deduction amounts onto derived employee fields such as payroll.deduction.<Type>.amount (employee fields you can fetch with the People search endpoint).

To read deduction rows, use List deduction entries for a list of employees (there is no per-employee GET).

Required permissions: People's Data > Payroll > Manage selected employees' Payroll sections (or Deduction table Manage when field-level permissions are enabled).