Dealing with HMRC – collection

Self Assessment Online: support for software developers

Technical specifications for software developers working with the Self Assessment Online service.

Generic technical specifications

  1. Self Assessment generic technical specifications (2015)

    • 12 February 2015
    • Guidance
  2. Self Assessment generic technical specifications (2014)

    • 1 January 2014
    • Guidance

Local Test Service

  1. Local Test Service and LTS update manager

    • 1 October 2014
    • Guidance

Technical support for previous tax years

  1. Self Assessment software developers forum: minutes

    • 1 January 2013
    • Guidance

Identical returns guidance

  1. Self Assessment identical returns: support for software developers

    • 1 January 2014
    • Guidance