Bitdefender Anti-Spam Lab points to a total of 10,000 tax-related e-mails sent in a single day in the first week of March. E-mails promise users hundreds of pounds, then silently steal authentication data. This type of tax refund phishing scam pretending to be from the very HM Revenue & Customs has been reinvented for years now and has regularly resurfaced in successful campaigns to target US, UK and Australian citizens alike. The official HMRC site clearly states that they NEVER send notification of a tax rebate by email, or ask you to disclose personal or payment information by email”]
Source: https://www.bitdefender.com/blog/hotforsecurity/wave-of-phishing-and-malware-marks-uk-tax-season/