Approximately 146,000 people who started to receive their State Pension during 2010-11, and who had other income, may have underpaid tax for 2010-11.
The underpayments will have arisen due to a computer glitch at HMRC. As the error was discovered in the year the liability arose these underpayments will not be waived by HMRC.
Scammers are latching on to this error and pensioners may be targeted. HMRC would never email or call to ask for your personal banking details so any request that is received is likely to be fraudulent. Any such requests should be ignored.
HMRC will always make their demands in writing. If you do receive a legitimate claim HMRC have disclosed that they will allow payments to be staggered over three years starting from 2012.