Section 19 – Uncertain or unascertained consideration
56.Section 19 provides that where the whole or part of the chargeable consideration for a transaction is uncertain or unascertained, the amount of consideration should be calculated on the basis of a reasonable estimate of the outcome. So where the consideration is uncertain or has not yet been ascertained – for example, where it is based on profits in accounts which have not yet been drawn up – buyers must make a reasonable estimate of the final consideration as at the effective date of the transaction.