Vehicle Economics

Keep 1 vs 3 More Years

Your car runs fine today. Does holding it one more year or three more years cost less, per year, once repairs are honestly priced in?

Recurring annual costs
Repairs

Why this comes up

"Should I keep this car one more year, or is it worth planning to hold it longer" is a narrower question than the full Keep vs Replace decision: it does not require naming a replacement candidate at all, just an honest look at whether your own car gets cheaper or more expensive to run per year as you hold it longer. A flat "cars get more expensive as they age" answer skips the real driver: whether repair costs are escalating faster than fixed costs are spreading out.

How we calculated this

Recurring costs (financing interest, depreciation, fuel or energy, insurance, maintenance) scale linearly with years. Repairs are modeled separately: a baseline annual figure that can escalate a chosen percent each year, plus an optional one-time major repair that only counts if it falls within the horizon being priced. Each horizon's annualized cost is its total divided by its years.

Worked example, using this page's own defaults: holding 1 more year totals $7,500 ($7,500 annualized). Holding 3 more years totals $22,672 ($7,557 annualized), about $57more per year, because an 8%-escalating repair budget compounds faster than the flat costs spread out.

What this means

  • If your repair-cost escalation is modest and no major repair looms, holding longer usually lowers your annualized cost, since fixed costs like insurance and financing interest spread over more years.
  • A major repair landing inside the longer horizon (a timing belt, a transmission) can flip the answer even when nothing else changes; try entering it to see the swing.
  • This engine never assumes a replacement car exists; it only prices the car you already own under two horizons.

Limitations

Repair escalation and any major repair are numbers you enter, not a prediction; a real vehicle's failure timing is not smooth or fully predictable. This model also does not know your reliability tolerance or how a breakdown mid-trip would actually affect you. See Methodology.

Methodology

This engine uses Vehicle Economics' ownership total cost model over two stated horizons, with a compounding repair-escalation option. See Methodology for the full detail.

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