HMRC says it has identified a calculation error that has overcharged millions of state pensioners. According to reporting cited by multiple outlets, the issue affects as many as 8.7 million people, with HMRC estimated to have collected around £43.5 million over the past year. The Independent reports that HMRC has apologised for the mistake and says it intends to correct the problem later this summer. The Mirror also states that the tax authority has yet to fix the error, highlighting that while the problem has been acknowledged, pensioners may still be waiting for an adjustment. The reports describe the situation as an administrative or calculation problem rather than changes to pension policy, and they note that HMRC is working to put matters right. Further details, such as how repayments or adjustments will be handled for affected individuals, are not included in the sources provided. Overall, the outlets agree that HMRC recognises the overcharging, estimates the scale of the impact, and says a fix is planned for later this summer.