A lease-end purchase is governed by a number written at the start of the lease. Whether it represents a good deal depends entirely on how the market moved in the meantime.
The buyout price was set years earlier
Lease contracts state a residual value, which is the vehicle's projected worth at lease end. The purchase option price is that residual plus specified fees.
That projection was made when the lease was written and does not adjust for what the used market subsequently did.
The lessee therefore holds an option. If the vehicle is worth more than the residual, exercising it captures the difference; if less, walking away is the cheaper path.
Wear and mileage charges enter the comparison
Returning a vehicle exposes the lessee to excess mileage charges and wear assessments defined in the contract.
Buying the vehicle eliminates those charges, because the lessee owns the condition and the miles. That avoided cost belongs in the comparison.
For a lease that ran well over its mileage allowance, the avoided excess charge alone can justify a buyout that otherwise looks marginal.
Fees differ between returning and buying
Most contracts include a disposition fee charged on return, which is typically waived if the vehicle is purchased or a new lease is signed with the same lender.
A purchase instead incurs sales tax on the buyout amount in most states, plus title and registration costs.
Those two items often move in opposite directions, so the honest comparison is total cost of each path rather than the buyout figure alone.
Financing a buyout is its own transaction
Lease buyouts are financed as used car loans, and rates differ from new car promotional financing. Some captive lenders offer their own buyout financing.
Credit unions are frequently competitive on this specific product, and comparing offers is worthwhile because the loan is separate from the lease agreement.
Timing constrains the shopping, since the buyout must be completed before the lease term ends. Arranging financing weeks ahead avoids a rushed decision at the deadline.
Lenders will want the buyout quote in writing. The figure includes fees and taxes that the residual alone does not, so the loan amount is larger than the contract number.
Third party interest depends on the lender
Some lenders permit only the lessee to purchase the vehicle, while others allow a dealer or third party to buy it out.
Where third-party buyouts are restricted, a lessee whose car is worth more than the residual can still buy it and sell it themselves, subject to tax and titling rules.
Rules vary by lender and state and have changed over time, so the contract and the current lender policy are what determine the available options.