A lease rate factor is the regular lease payment as a percent of the total cost of the leased equipment. Stated another way, if you multiply the lease rate factor by the cost of the leased equipment, you will determine the regular payment amount. The lease rate factor is a simplistic way of getting the payments but it is not that simple.
The minimum lease payments are the lowest amount that a lessee can expect to make over the lifetime of the lease. The minimum lease payments, including a guarantee of a residual if applicable, are used to value the lease by doing a net present value (NPV) calculation. The method of calculating minimum lease payments is laid out in the Statement of Financial Accounting Standards No. 13 (FAS 13), Accounting for Leases.