Self Assessment customers have until 1 April 2022 to pay their 2020 to 2021 tax bill or set up a payment plan to avoid incurring a penalty.Self Assessment customers have until 1 April 2022 to pay their 2020 to 2021 tax bill or set up a payment plan to avoid incurring a penalty.Read MorePress releaseHM Revenue & Customs – Activity on GOV.UK