A surge in income tax refund scams has prompted warnings from financial experts and authorities. Martin Lewis has alerted NS&I customers about unexpected bills arriving by post. The UK’s HMRC has issued a warning regarding sophisticated scam letters being sent to households. Additionally, the Income Tax Department has advised taxpayers to be cautious of online scams involving fake calls and pop-up notifications promising tax refunds. The State Bank of India has also cautioned the public about fraudsters impersonating officials from the Central Bureau of Investigation or the Income Tax Department, urging individuals to report such incidents by calling 1930.