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15 August 2026

Lease vs loan: a quantitative approach to auto financing

Discover the key factors to consider when choosing between leasing and loan options for auto financing, and learn how to build a comprehensive total-cost-of-ownership model

Lease vs loan: a quantitative approach to auto financing

When it comes to auto financing, buyers are often faced with a difficult decision: whether to lease or loan a vehicle. Both options have their advantages and disadvantages, and understanding the financial implications of each is crucial in making an informed decision. A total-cost-of-ownership model can help buyers compare the costs of leasing and loaning, taking into account various factors such as money factorsresiduals and opportunity costs.

To build a total-cost-of-ownership model, buyers need to consider the cost of capital which includes the interest rate and other fees associated with the loan or lease. They also need to consider the residual value of the vehicle, which is the estimated value of the vehicle at the end of the lease or loan term. Additionally, buyers should consider the opportunity cost of their money, which is the potential return on investment they could earn if they were to invest their money elsewhere.

Understanding Money Factors

A money factor is a measure of the cost of borrowing, expressed as a decimal value. It is used to calculate the monthly payment for a lease or loan. To convert a money factor to an annual percentage rate (APR) buyers can use the following formula: APR = (money factor x 24) / 12. For example, if the money factor is 0.0025, the APR would be (0.0025 x 24) / 12 = 5%.

Calculating Residuals

The residual value of a vehicle is the estimated value of the vehicle at the end of the lease or loan term. It is typically expressed as a percentage of the vehicle’s manufacturer’s suggested retail price (MSRP). For example, if the residual value is 50% of the MSRP, and the MSRP is $30,000, the residual value would be $15,000. Buyers can use the residual value to calculate the total cost of ownership which includes the monthly payment, interest, and other fees.

Considering Opportunity Costs

An opportunity cost is the potential return on investment that buyers could earn if they were to invest their money elsewhere. For example, if buyers were to invest their money in a savings account earning a 2% interest rate, the opportunity cost of using that money to buy a car would be 2%. Buyers should consider the opportunity cost of their money when deciding whether to lease or loan a vehicle, as it can help them determine which option is more cost-effective.

When to Prefer Cash Purchase

In some cases, buying a vehicle outright with cash may be the most cost-effective option. This is particularly true for buyers who have the means to pay cash and can avoid the costs associated with financing, such as interest and fees. Additionally, buying a vehicle with cash can provide buyers with more flexibility and control over their purchase, as they are not locked into a lease or loan agreement.

Author

James Carter