DMBM512225 | Customer contact and data security: contact with third parties: getting authority: customer not present - advising third party on correct procedure
From HM Revenue & Customs · Debt Management and Banking Manual
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If you receive a call from a third party for who we do not hold consent, then you must advise that
for confidentiality reasons we are unable to deal with the customers tax affairs with a third party
they should ask the customer to call in on their own behalf
provided the customer phones in first and completes our required verification checks then we will be able to accept verbal consent from the customer to speak to a third party of their choice.
This verbal authority can be when both the customer and the third party are present together or up to 4 months in advance.
If the customer does call back to give verbal authority, see:
DMBM512205 - Third party and customer present at the same time
DMBM512220 - Advanced verbal consent.