The sticker price is the easy part
A car's advertised price is the number everyone anchors on, but it's just the starting point for what owning that car actually costs. Insurance, fuel or charging, maintenance, and depreciation all run in the background every month, whether or not the loan payment is the only number you budgeted for.
A rule of thumb to start from: 20/4/10
- 20% down - at least a fifth of the price upfront, so you're not financing the whole thing.
- 4 years or less - a shorter loan term than dealers often push, which limits how long you're paying interest.
- 10% of gross income - total monthly car costs (payment, insurance, fuel) shouldn't exceed about a tenth of what you earn before taxes.
Why the loan term matters more than it seems
A longer loan term lowers the monthly payment, which is exactly why it's tempting - but it also means paying interest for longer and, for much of the loan, owing more than the car is worth. A 7-year loan on a depreciating asset is a common way people end up unable to sell or trade in a car without bringing cash to the deal.
New vs. used
A new car loses a meaningful chunk of its value in the first year or two, which is exactly the value a used buyer skips paying for. A car that's two or three years old is often a large discount off the new price for a small difference in remaining lifespan, especially on models known to hold up well.
New isn't always the wrong call - lower financing rates, a full warranty, and knowing the exact maintenance history all count for something. It's a tradeoff, not a rule.
Total cost of ownership, not just the payment
- Insurance - varies a lot by model, and worth a real quote before you commit, not an estimate.
- Fuel or electricity - a less efficient vehicle or a longer commute changes this significantly.
- Maintenance and repairs - luxury and some import brands often cost noticeably more to service.
- Depreciation - the quiet cost of a car losing value even if nothing ever goes wrong with it.
Watch the whole deal, not just the monthly number
A dealer focused on hitting a monthly payment you're comfortable with can get there by stretching the loan term or raising the price - the monthly number can look fine while the total cost quietly goes up. It's worth negotiating the price and the loan term separately, and running the full total cost yourself rather than accepting a payment that was reverse-engineered to sound affordable.
Run the numbers on a specific car
Once you have a real price, down payment, and loan term in mind, it's worth checking how that specific combination affects your monthly budget and risk, rather than a rough guess at what you can afford.