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    1. Home
    HMRC internal manual

    National Insurance Manual

    From:
    HM Revenue & Customs
    Published
    11 April 2016
    Updated:
    5 June 2025 - See all updates

    Summary

    Guidance on the law relating to National Insurance contributions including classification, refund and confirming National Insurance Numbers (NINO)

    Contents

    1. NIM00001
      Overview and Purpose: Contents
    2. NIM01000CO
      Class 1 National Insurance contributions: contents
    3. NIM13000CO
      Class 1A National Insurance contributions: contents
    4. NIM18000
      Class 1B National Insurance Contributions: Contents
    5. NIM20000CO
      Class 2 National Insurance Contributions: Contents
    6. NIM24000CO
      Class 4 National Insurance Contributions: Contents
    7. NIM25000CO
      Class 3 National Insurance contributions: contents
    8. NIM27000CO
      Special Cases: contents
    9. NIM37000CO
      Refunds of NICs: contents
    10. NIM39000
      National Insurance Numbers: contents
    11. NIM41000
      Non-benefit credits: Overview: contents
    12. NIM41300
      Home Responsibilities Protection: contents
    13. NIM70000
      Class 2 National Insurance contributions from 6 April 2015: General information: Contents
    14. NIM71000
      Class 2 National Insurance contributions from 6 April 2015: international: contents
    15. NIM72000
      Class 2 National Insurance contributions from 6 April 2015: payments: contents
    16. NIM73000
      Small Earnings Exceptions
    17. NIM74000
      Class 2 National Insurance contributions from 6 April 2015: special cases: contents
    18. NIM75000
      Class 2 National Insurance contributions from 6 April 2015: Maternity Allowance: contents
    19. NIMAPP1-0
      Appendix 1: Draft letters
    20. NIMABBR
      Abbreviations

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