IHTM42976 | Employee benefit trusts: sub-trusts: nil-rate band and calculation of tax

From HM Revenue & Customs · Inheritance Tax Manual

Generally, an employee benefit trust and any sub-trusts are one settlement () as the sub-trusts are usually just an allocation of trust funds. In the event that any of the relevant property trust charges apply to a sub-trust (), any calculation will need to take into account all the property contained in that one settlement (the original employee benefit trust) and any sub-trusts. Then tax is calculated and charged on the event concerned in the normal way.

Where the sub-trusts are allocations of funds within a single trust, there is only one nil-rate band to take into account.