206-320 Special calculation of chargeable consideration
Where the special rules (see ¶206-300) apply, the calculation for chargeable consideration is by reference to the market value of the subject-matter at the time of the transfer, and not by what money or moneyʼs worth has actually been passed as consideration.
The chargeable consideration is taken to be:
MV × (100−SLP)%
where MV is the market value of the interest transferred and