HMRC have updated their list of examples of websites, emails, letters, text messages and phone calls used by scammers and fraudsters to obtain individual's personal information.
The guidance can be used to help you decide if a contact from HMRC is genuine, this guidance provides examples of the different methods that fraudsters use to get individuals to disclose personal information.
You can also read about how to recognise genuine contact from HMRC, and how to tell when an email is phishing/bogus.
Internet link: GOV.UK phishing-and-bogus-emails-HMRC