If a person is entitled to an interest in possession under the
terms of a settlement as remuneration for services as a trustee (a
very rare event in modern times) IHTA84/S90 provides a relief:
To the extent that it represents no more than a reasonable
amount of remuneration
If the interest is of more than a reasonable amount the excess
will be taxed.
These provisions apply to all trustees, whether original or
successors.