If you lease with NMAC, you will have the option to buy the lease for the GROSS PAYOFF (which equals residual after all payments have been made...assuming you have not accrued any late charges, admin fees, etc.) PLUS a PURCHASE OPTION FEE of $300 plus sales tax, plus any applicable state fees (license/reg, etc.).
Before you ask......Why sales tax? Because in a lease, you've only paid sales tax on the depreciation (i.e., the difference from the capitalized cost (i.e., sales price) down to the residual.) If you buy it....got to pay the tax.....if you turn it in...you don't pay the tax.