IHTM36268 | Settling the penalty: administrative procedures
From HM Revenue & Customs · Inheritance Tax Manual
When you have issued the letter of acceptance (IHTM36267) you will need to
BU (IHTM32031) the file for the time when payment (of the whole or first instalment) of the penalty is due
follow the procedures (IHTM36391) for bringing the penalty to account
cross through any note on the front of the file relating to penalty time limits (IHTM36165)
consider issuing a letter (IHTM36271) explaining how problems might be avoided in the future.
When the penalty is paid, you will need to close the penalty record on COMPASS (IHTM36376)