IHTM10043 | IHT400 - Declaration (pages 12 and 13)
From HM Revenue & Customs · Inheritance Tax Manual
The declaration on pages 12 and 13 of the IHT400 tells you
By signing this section of the form the personal representatives confirm that they have read and understood the declarations and warnings and that they agree that the information provided in the IHT400 and any completed schedules is correct.
Use the links to find additional guidance on what you need to consider when you look at each part of the declaration.