CRYPTO26000 - Cryptoassets for individuals: pension contributions
Registered pension schemes (RPS)
HMRC does not consider cryptoassets to be currency or money, so they cannot be used to pay a tax relievable pension contribution to an RPS. For more information on RPS contributions see PTM041000.
If cryptoassets are nevertheless effectively put into an RPS (albeit without tax advantage), the consequence is that they become part of the scheme which is subject to the RPS tax rules.
More information on the RPS tax rules can be found in the Pensions Tax Manual.