Alarmed people are complaining to HMRC in their droves about companies claiming tax repayments on their behalf. Complaint numbers about repayment agents have more than tripled since 2020, according to an investigation by BBC Radio 4's Money Box.
In many of the cases complainants say they have no knowledge of the claims and never gave their permission for them to be made. HMRC has accepted there are significant concerns around such companies and the unregulated market they operate in.
The complaints centre around what are known as "deeds of assignment". This is where someone signs over their right to something - usually related to money - to another party to claim it for them.