HMRC is calling on people to stay vigilant against fraudsters, who are using email and text messages to scam them out of their savings.
The tax authority is currently processing tax refunds after the end of the 2017/18 tax year.
Criminals, however, are taking advantage of this by sending out scam emails and SMS-messages to trick the public into thinking they have received a tax rebate.
Many of these fraudulent emails and texts include links which take the user to dubious websites where their information can be stolen.
HMRC has assured that anyone owed a genuine tax rebate will receive a tax calculation letter by post between June and October 2018.
From April 2017 to March 2018, HMRC received more than 750,000 customer phishing email and SMS referrals, and reported almost 15,000 malicious websites for takedown.