Say you’re considering buying a $30,000 car. You qualify for a financing with a five-year term and a 7.5% APR. Alternatively, you could invest in a portfolio with an average return of 9% per year (compounded annually). Since the car is new, it’s set to lose 20% of its value in the first year and 10% annually for the next four years.
Here’s how much you would make after five years assuming your investments consistently yield 9% annually:
- Investment yield: $16,160
- Car loan interest cost: $6,070
- Net returns: $10,090
After five years, you would have made over $10,000 and you would own a vehicle worth over $11,000 (after depreciation). Of course, this is a fairly idyllic picture. Investments don’t always perform well. If you lose money, you must still repay your car loan.
Additionally, car loan interest rates have been rising steadily for years. If your portfolio’s average annual returns are lower than your car loan interest rate, you’d be better off buying a car outright.

