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HMRC internal manual

National Insurance Manual

HM Revenue & Customs
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Overview and purpose: the structure of the NIM

The National Insurance Manual (NIM) is broken down into seven main sections. These sections follow the six classes of National Insurance contributions (NICs) plus a section dedicated to Special Cases. This structure is broadly in line with the structure of the law relating to NICs.

The six Classes of NICs

The NIM covers the six classes of NICs. These are:

Special cases

The Special Cases section of the NIM covers: