Implementation of changes to login for HMRC Online Services
HMRC takes security very seriously but you need to be alert. If you cannot verify the identity of the person making the call you should not disclose your personal details. You should report these incidents on the Action Fraud website, or you can call them on 0300 123 2050 (Please note this number will be charged at your normal network rate). They are open Monday to Friday 09:00 - 18:00.
To learn more about dealing with phishing and scams visit GOV.UK.