IHTM36165 | Investigating incorrect accounts, information or documents: noting up penalty time limits
From HM Revenue & Customs · Inheritance Tax Manual
There is a 3 year time limit (IHTM36108) from the date on which the correct tax liability is notified to the taxpayer for pursuing a penalty.
When you begin your investigation into a penalty you should put a note in red ink in the notes box (IHTM03035) on the front of the file cover. The note should say ‘PENALTY CASE: TIME LIMIT EXPIRES ON (add date 3 years from the date on which the tax payable on the chargeable transfer (IHTM04027) concerned was notified to the taxpayer)’
The existence of the time limit means that you should
avoid the premature notification of the tax payable, and
obtain the penalty or conclude a settlement (IHTM36261) as quickly as possible once the notification is given.
In any case where 2 years have passed since the tax was notified and a penalty has not been obtained or a settlement concluded, you should refer the file to your SO manager with a note setting out the facts of the case and of the negotiations to date. The B2 manager will decide in conjunction with the Penalty Portfolio Holder whether to send a report to Tax Administration, Litigation and Advice (TALA) (IHTM36361) to consider taking formal penalty proceedings.