42A lessee shall remeasure the lease liability by discounting the revised lease payments, if either:

42 A lessee shall remeasure the lease liability by discounting the revised lease payments, if either:

(a) there is a change in the amounts expected to be payable under a residual value guarantee. A lessee shall determine the revised lease payments to reflect the change in amounts expected to be payable under the residual value guarantee.

(b) there is a change in future lease payments resulting from a change in an index or a rate used to determine those payments, including for example a change to reflect changes in market rental rates following a market rent review. The lessee shall remeasure the lease liability to reflect those revised lease payments only when there is a change in the cash flows (ie when the adjustment to the lease payments takes effect). A lessee shall determine the revised lease payments for the remainder of the lease term based on the revised contractual payments.

43 In applying paragraph 42, a lessee shall use an unchanged discount rate, unless the change in lease payments results from a change in floating interest rates. In that case, the lessee shall use a revised discount rate that reflects changes in the interest rate.