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HMRC internal manual

Self Assessment Manual

Manage work: customer service: online services helpdesk

The contact telephone number is

Online Services Helpdesk: 0300 200 3600

The Online Services Helpdesk is available on

  • Monday to Friday 8am to 8pm
  • Saturday 8am and 4pm
  • Closed Sundays, Christmas Day, Boxing Day and New Years Day


Textphone: 0300 200 3603