NationalInsuranceAssignment

appliesFromDate
Type: stringFormat: date
required

First date in the supplied Tax Year on which this category applies. It must fall within that Tax Year.
niCategory
Type: stringenum
required

Employer-confirmed NI category. PayrollKit validates supplied eligibility facts and does not assume category A.
values
- A
- B
- C
- D
- E
- F
- H
- I
taxYear
Type: string
required