At the end of the last tax year I received a statement from HMRC saying I owed them £422.60 in underpaid tax. After being informed by the HMRC that you had underpaid your tax by £422.60, you were happy to pay the amount. Understandably, being charged for the same underpaid tax twice was frustrating, especially as you had since retired and needed the funds. In the meantime, it continued to reclaim the underpayment from your private pension which meant by November, it had taken the payment nearly twice over. By this point, you were getting incredibly frustrated as you had paid out nearly another £422.60, despite paying the underpaid tax in good time.

Source: Daily Mail January 06, 2022 20:36 UTC