Usually the deadline for filing a return and paying any due tax are one and the same thing ... but the recent Covid-19 variations could lead to the following situation:
* Client files return with HMRC on/before 28th Feb - with result that no late filing penalty is due.
* Client sends payment to HMRC at any time on/before 1st April - so no late payment penalty should be due.
* However interest has been applied on the tax due from 1st Feb onwards - thereby increasing the amount payable.
* Tax-payer is either unaware of this or fails to calculate interest accurately, so has not actually made full payment to HMRC - and therefore late payment penalty is levied?
Hopefully I've misunderstood something fundamental here ... if so, could someone enlighten me please?