Thousands of people saving into a pension could be owed £80,000 each after overpaying tax on their retirement pots.
The issue affects around 75,000 people, normally business owners, who were told to pay stamp duty on commercial properties put into their personal pensions.
This is normally a tax-free process, and tax experts Cornerstone Tax say refunds of £6billion could be due from HM Revenue & Customs (HMRC), the i reports.