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.
Often, we have no activity on a loan or an investment but we want to know the amount of interest that is accruing or compounding. You can trigger the interest to appear by adding events such as a Payment or Invest for a $0 amount. This causes TValue to calculate the interest and, depending on the compute method, either add it to the principal if you are using Normal (compound interest) or to the accrued interest balance if you are using US Rule (simple interest).
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.