NAO flags HMRC's failure to lock down fraud-detection rules before expanding to other benefits

The National Audit Office warned on 24 June 2026 that HMRC must document lessons from its Child Benefit residency-matching programme before scaling the methodology to other welfare schemes. HMRC's specialist team uses Home Office travel data to flag non-resident claimants, projecting £350 million in savings. The NAO's concern: without codified procedures and error-handling protocols, scaling risks repeating past mistakes—particularly given HMRC's track record of delayed corrections in Tax Credits overpayments.