The amounts by which the rentals may vary is determined by
looking at the rentals payable over various 12 month periods, which
the legislation refers to as reference years. These are
It follows that any part of the final year, other than the last
day, may also be part of a reference year.
To be a short lease
In deciding whether a lease is a short lease, the decision
should be taken at inception. In taking that decision, changes that
might arise due to variations in interest rates are ignored.
Any other known causes of variation should be taken into
account. Variations that could not reasonably be predicted (such as
result from tax variation clauses) need not be taken into account.
These rules mean that the rentals payable in the first year
may be much higher than those payable in subsequent years and that
rentals may decrease by any amount over the term of the lease. In
addition, and in broad terms, rentals should not increase
significantly at any point during the term of the lease.