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HMRC will only email you with confidential information if you’ve given them your written agreement they can do so.


  • Telephone: 0300 123 2326
  • Fax: 03000 533 124

Call HMRC for help with IR35 enquiries.

Find out about call charges

Opening times:

8.30am to 4.30pm, Monday to Friday

Closed weekends and bank holidays


Write to HMRC for help with IR35 enquiries.

HM Revenue and Customs
IR35 Customer Service Unit
Newcastle Upon Tyne
NE98 1ZZ
United Kingdom

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