Those affected must submit their first quarterly update to HMRC using compatible software by the deadline. Anyone in scope should make sure they have signed up to Making Tax Digital, are using HMRC-compatible software and submit their quarterly update before the deadline. Once four penalty points have been accumulated, HMRC will issue a £200 fixed penalty, with further penalties possible for continued non-compliance. Although the quarterly submissions do not require taxpayers to pay tax immediately, experts say that could change in the future. However, she warned HMRC is considering wider reforms to Self Assessment that could bring tax payment dates forward from April 2029.