Vehicle EconomicsNew vs Used Break-Even
How much of a used-price discount, or repair risk, would it take to flip a new-vs-used decision?
Why this comes up
New vs Used Car Calculator answers the forward decision and solves one repair-cost lever along the way. Sometimes the real question runs the other direction: exactly how much of a price discount, or how much annual repair risk, would it actually take to flip your decision, as a standalone threshold you can check any real offer against.
How we calculated this
Each option's total cost sums financing interest, depreciation, fuel or energy, insurance, maintenance, repairs, and transaction costs over your horizon. The price mode solves how much the used option's effective cost would need to drop for the two to tie. The repair mode solves the same gap, then divides it by your horizon into an annualized figure, useful for weighing an ongoing repair-risk premium rather than a one-time price.
Worked example, using this page's own defaults: the used option already costs$4,600 less than new over 3 years, so in repair mode it could absorb about $1,533 more in repairs and maintenance per year before new wins instead.
What this means
- Because total cost of ownership is a straight sum of its parts, both thresholds are exact, not estimates, no search or approximation is involved.
- A "no discount needed" or "no gap needed" result means the option you're solving for already wins outright at today's numbers.
- Run the full forward comparison in New vs Used Car Calculator once you have a real quote to check against this threshold.
Limitations
Every figure is your own scenario for two specific vehicles, not a market-wide new-vs-used rule. See Methodology.
Methodology
This engine combines Vehicle Economics' ownership total cost model (every ownership cost, depreciation, financing, fuel, insurance, maintenance, repairs, and fees, summed over your horizon) and break-even search model (a closed-form solve where one exists, otherwise a bounded search over a stated plausible range). See Methodology for the full detail.