Used-Car Ownership Cost: Build a Three-Year Comparison

A purchase budget answers whether you can buy a car. An ownership budget asks whether you can keep using it. Compare both over a period that matches your plans, such as three years. Use the same mileage and financing assumptions for every candidate.

Keep cash flow and economic cost separate

A down payment is cash you need now. Depreciation is the difference between what you pay for the vehicle and what you eventually receive when selling it. If you count the full purchase price and depreciation together without also accounting for resale proceeds, you count part of the cost twice.

Record the purchase total, insurance, borrowing costs and any inspection-identified repairs. Estimate fuel or electricity from your mileage and an explicit consumption assumption. Add registration, parking and scheduled maintenance relevant to your location and vehicle. A precise insurance quote deserves more weight than an optimistic guess about resale.

Use a transparent example

Imagine a cash purchase costing $18,000 before ownership expenses. If you later receive $12,000 when selling, the purchase-and-resale difference is $6,000. Add $4,500 of fuel, $4,200 of insurance and $2,000 of maintenance and repairs: $16,700 over the period, before other applicable charges. Every figure here is illustrative; actual resale and repairs are uncertain.

Repeat the calculation with a lower resale value and a larger repair bill. Do not assume both cars will have identical surprises. Ask whether the comparison still works if the less expensive candidate needs the substantial repair identified by your inspector. Keep an emergency reserve outside a spreadsheet’s tidy average.

Use the result to narrow the choice

An ownership estimate is a decision aid, not a warranty. Its strength comes from showing the assumptions. When two cars are close, documented condition and suitability may matter more than a small estimated advantage that disappears when one uncertain input changes.