Up to 1,000 taxpayers were charged more than once during self assessment due to a technical glitch with Santander’s payment system.
On 31 January, some customers paying through Santander’s BillPay were mistakenly charged twice.
HMRC has confirmed all affected customers have been refunded.
AccountingWEB members highlighted the issue last week, but were troubled about the authenticity of a notification email sent by HMRC.
Phishing emails have been a problem for HMRC recently, with the Revenue advising people to keep a watchful eye.