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HMRC internal manual

Inheritance Tax Manual

Lifetime transfers: the charge to tax: potentially exempt transfers (PETs): cumulating transfers more than seven years before death

As in the previous cumulation example (IHTM14513), you may have to look back at transfers more than seven years before the date of death, and possibly up to 14 years. For instance, where a PET was made 6 yrs 11 months before the death you will need to consider the period 13 yrs 11 months prior to the death.

In practice, you only need to look for transfers outside of seven years of the death which were immediately chargeable. Any such transfers should have been declared when they were made on form IHT100 (IHTM10501) and the lifetime file should have been integrated with the death file.