What happens if I miss an MTD quarterly deadline?

HMRC uses a points-based system. Each late quarterly update earns one point, and at four points you receive a £200 penalty, with a further £200 for each later default. HMRC is not issuing points for late quarterly updates during 2026/27, though that does not cover the final declaration or late payment of tax. August's reminders flag each deadline before it arrives. August's MTD feature and compliance reminders for landlords help you stay on track.