Trade-In vs. Keep Your Car Calculator
A paid-off car with rising repair bills eventually costs more to keep than to replace — but that point is usually later than it feels. This calculator compares the two paths over the next few years: keeping your current car (maintenance, fuel, any remaining payments) against upgrading (a new payment, fuel, and the depreciation of the new car).
Because a new car’s depreciation almost always dwarfs an old car’s repair bills, keeping a reliable paid-off car usually wins. The calculator puts real numbers on both so you upgrade when it makes sense, not when the service bill stings.
Calculator
Keeping your car costs less
$31,240
over 3 years
Cost to keep
$11,564
Cost to upgrade
$42,804
New-car depreciation
$16,497
New payment
$802
The upgrade’s depreciation (about $16,497) is usually the deciding cost — it typically dwarfs an older car’s repair bills, which is why keeping a reliable paid-off car often wins.
Calculation Formulas
Key Figures
| Figure | Value | Description |
|---|---|---|
| Depreciation dominates | New-car hit | A new car’s depreciation usually exceeds an older car’s repair bills, which is why keeping often wins. |
Note: Results are estimates for planning purposes. Rates, fees, taxes, and insurance vary by lender and location — confirm exact figures with a licensed professional before making financial decisions.
Standards & Sources
Last verified: November 2026
- Residual-value & repair-cost data
The comparison depends on model-specific depreciation and repair costs; use your own estimates where you have them.
How to use this calculator
- Enter your current car’s annual maintenance and expected repairs, its MPG, and any remaining loan payments.
- Enter the price, trade-in value, APR and term of the car you would upgrade to.
- Set how many years you want to compare over, and your annual mileage and fuel price.
- Read the total cost of keeping versus upgrading and which comes out cheaper.
Frequently Asked Questions
Should I keep my paid-off car or buy a new one?
Usually keep it. A new car’s depreciation in the first few years almost always exceeds what you would spend repairing a reliable older car. The calculator compares both totals so you can see the gap.
When is it finally time to replace a car?
When repair costs become frequent and large relative to the car’s value, or reliability affects your safety or work. Compare the annual cost of keeping it against a new car’s full cost, not just its payment.
Does a repair bill mean I should trade in?
Not by itself. Even a $2,000–$3,000 repair is often far less than a year of a new car’s depreciation and payments. Run both numbers before the service bill pushes you into a purchase.
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