Commentary on Sections Schedule 6 - Leases Variable or uncertain rent
247.Where rent is variable or uncertain, paragraph 10 applies. The rules provide that the buyer must make their return with the amount of rents based on an estimate as to what the amount of rent will be during the first 5 years of the lease. For the subsequent years of the lease (if it has been granted for a period of longer than five years) the rent payable is assumed to equal the highest amount paid in any period of 12 consecutive months in the first 5 years. No account is taken for changes in rent which are purely in line with inflation.