If you were due to make payments on account towards your 2019/20 tax liability then you may have already received a statement from HM Revenue and Customs regarding the second payment on account which would usually be due by 31 July 2020. You will notice that the due date for the payment is showing as 31 January 2021.
The reason for this is that HMRC have deferred the 31 July 2020 payment until 31 January 2021 to help those having financial difficulties due to Covid-19.
If you want to make an interim payment like you normally would then you can continue to do so.
However, if you choose to defer the payment there is nothing for you to do and HMRC will not charge any late payment interest or penalties.