You find a car for $15,000. It looks like the finish line: save the money, buy the car, start driving. But a car is both a purchase and an ongoing responsibility. Those need two different money questions.
Buying it and running it
The first question is, “What will it take to get this car?” Depending on the transaction, that can include taxes, registration and other charges beyond the advertised price. The second is, “What will it take to keep using it?” Fuel, insurance, maintenance and repairs belong in that conversation.1
For a simple illustration, suppose fuel is $100 a month, insurance is $180 and you set aside $70 for maintenance and repairs. That is $350 a month — $4,200 over a year — before registration, parking or any loan payment. These invented amounts are not quotes or a complete ownership budget. Your car, location and insurance situation could produce very different costs.
The monthly payment is only one piece
If you borrow to buy the car, a smaller payment can look comforting. A longer loan term can lower that payment while increasing the total interest paid.1 The payment also does not include every cost of driving.
A useful car conversation starts before falling in love with a particular model. Think about what the car needs to do, how often you will use it and how you would handle a repair. The most exciting affordable car is one you can continue to afford after bringing it home.
Sources & further reading
Examples are illustrative. Financial and employment references relate to the United States.