VATREG46050 | Registration of persons who make taxable supplies in the Isle of Man: where should a trader be registered?
From HM Revenue & Customs · VAT Registration
When:
you receive a request for registration from a person who has an establishment in both the IoM and the UK, and
you feel that the trader could not be controlled effectively by the Local Office
you should consult with the IoM service to establish the best place for control. A telephone call may be sufficient to come to a joint decision. Where a written report is required, you should include:
particulars of all the establishments in both countries including addresses, as defined in VATREG45200
the precise activities carried out at each establishment
the type and value of supplies, both taxable and non-taxable, made by each establishment.
Some of this information may not necessarily be readily available and you may have to get further information from the trader before contacting the IoM Service.