← Guides · November 12, 2026
How Long Should You Keep a Car? A Cost-Per-Month View
Every car has an ownership length that minimizes its cost per month. Sell too early and you keep paying the steepest depreciation. Keep it too long and repairs start to climb. The best answer lies between those, and it is different for each car.
Two forces pulling in opposite directions
- Depreciation per year falls as the car ages. The first years cost the most in lost value. Spread over more years, the average drops.
- Maintenance and repairs rise as the car ages. Older cars tend to need more work, and bigger repairs become more likely.
The sweet spot is where the two roughly balance.
A worked example
Same $30,000 car, paid in cash, driven 12,000 miles per year at 30 mpg and $3.50 fuel, insurance $1,800 and fees $300 per year. The resale value and yearly maintenance are illustrative assumptions that change with age:
| Years kept | Resale | Maintenance per year | Cost per month | Cost per mile |
|---|---|---|---|---|
| 3 | 62% | $600 | $658 | $0.66 |
| 5 | 50% | $900 | $617 | $0.62 |
| 7 | 40% | $1,300 | $614 | $0.61 |
Keeping the car 5 years instead of 3 cuts the monthly cost by about $41. Going from 5 to 7 years barely changes it, about $3, because rising repairs cancel the depreciation savings. At 7 years you also carry more risk of a large, unexpected bill.
What the table does not show
- The value of reliability and safety features in a newer car.
- Your cash flow: fewer surprises may be worth a slightly higher monthly cost.
- Model differences: some models hold value and stay reliable far longer than others.
How to use it
- Estimate resale value for several ownership lengths using real listings. See depreciation.
- Estimate maintenance for each period using the maker’s schedule and the model’s reputation. See the upkeep budget.
- Enter them in the calculator and look at the cost-per-month table for your own car.
Numbers are illustrative. Real depreciation and repair costs vary a lot by model. This is general information, not financial advice.
More guides
- Car Depreciation Explained: How Much Value You Lose and How to Estimate It
- Car Maintenance and Insurance Budget: What to Set Aside Each Year
- Cost Per Mile of Driving: How to Calculate It and What to Do With It
- Financing vs Paying Cash for a Car: What the Interest Really Costs
- Fuel Cost and MPG: How Much Does Fuel Economy Really Save?
Written by the Wheelwise editorial team. Figures are illustrative and rules change, so check official sources. See how we write and update guides on the About.