Fraudsters posing as the taxman could strike with fake offers of tax refunds as the January 31 self-assessment deadline approaches, HM Revenue and Customs (HMRC) is warning.
Over the past year, HMRC has received nearly 900,000 reports from people about suspect contact including phone calls, texts or emails.
More than 100,000 of these were phone scams, while over 620,000 reports from people were about bogus tax rebates.
Common techniques fraudsters use include phoning taxpayers offering a fake tax refund, or pretending to be HMRC by texting or emailing a link which will take customers to a false page, where their bank details and money will be stolen.
Fraudsters may threaten victims with arrest or imprisonment if a bogus tax bill is not paid immediately.
HMRC operates a dedicated customer protection team to identify and close down scams.
It is also advising customers to recognise the warning signs of scams.
Genuine organisations such as HMRC and banks will never contact customers asking for their pin, password or bank details.
It said customers should never give out private information, reply to text messages, download attachments or click on links in texts or emails which they were not expecting.
Details of suspect calls or emails claiming to be from HMRC can be forwarded to phishing@hmrc.gov.uk and texts to 60599.
Cases can also be reported to Action Fraud.
Tax is automatically deducted from most UK taxpayers' wages, pensions or savings.
But people could need to complete a tax return, for example if they are self-employed or have earned more than £2,500 from renting out property, or if they or their partner received child benefit and either of them had an annual income of more than £50,000.
They may also need to fill in a form if they have earned more than £2,500 in other untaxed income, for example from tips or commission.
Self Assessment guidance is available at https://www.gov.uk/self-assessment-tax-returns
