HMRC error affects 350,000 tax returnsHundreds of thousands of taxpayers have received incorrect tax returns with an error in their capital gains allowance, with HMRC stating that nearly 350,000 tax returns were affected by the error. According to HMRC, the short tax returns showed capital gains tax exemptions of £400 less than they should have been, based on the 2017-18 CGT figure rather than the 2018-19 allowance. Around 600 individuals with capital gains may have been affected by the mistake, with HMRC confirming that anyone who filled out the capital gains page unnecessarily would not have their tax liability affected.