For leased assets in AssetAccountant it is possible to accommodate increasing interest rates during the life of the lease. E.g. after year 1, if the interest rate were to increase by 0.5%, and so on.

This can be done by applying a Refinance Lease transaction to an existing lease:

By selecting the Refinance Lease action, you will be able to select the Refinance Date and the Amount Refinanced, then generate a revised payment schedule going forward with the new interest rate.