HMRC: National Insurance

Endpoint URL:

• Sandbox - https://test-api.service.hmrc.gov.uk Production - https://api.service.hmrc.gov.uk

Documentation URL:

• https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/national-insurance/1.1

Contact:

• SDSTeam@hmrc.gov.uk

Description:

This API retrieves an annual summary of an individual taxpayer’s class 1 total earnings and class 2 National Insurance contributions due for a given tax year.

Its primary use is for the calculation of a self-employed taxpayer’s National Insurance liability within the Self Assessment tax calculation.