New vs used, three years in
Thirty-six months of cash, the same model on both sides, laid out month by month. Every figure below is arithmetic we did ourselves from assumptions we state out loud — and there is one number we deliberately leave blank, because inventing it is how this comparison usually goes wrong.
The honest version of this comparison is unusual in one respect: it refuses to tell you what either car is worth at the end. Resale value is the largest single term in the equation, it is specific to a model and a market, and the confident percentages that circulate for it are exactly the kind of number we will not manufacture. So we have built the cash side completely, and then turned the resale question into something you can look up in ten minutes.
The assumptions — all chosen by us, all illustrative
- Same model, same trim, both bought outright
- New at $32,000 out the door. A three-year-old example of the same car at $21,000 out the door. Round numbers picked to make the arithmetic legible.
- Cash, not financed
- Deliberate. Interest would add to both columns and the larger balance accrues more of it at any given rate, which would widen the gap rather than change its direction.
- Insurance and fuel held equal
- Same model, same driver. Premiums are quoted per vehicle and per driver by each insurer — get both quotes yourself rather than letting an assumption do the work here.
- Routine maintenance held equal at $200 a year
- Oil, filters, wipers. The same car needs the same things regardless of when you bought it.
- Wear items assumed on the used car only
- The used car arrives partway through its tires, brakes and battery. The new one does not. This is the real age difference, and it is the one we have priced.
- A repair reserve on the used car
- $1,200 set aside for something unbudgeted. Whatever original factory coverage a new car carries is set by the manufacturer and differs by brand and term — we have represented it as an allowance rather than stating a term we cannot verify for your car.
Out the door — vehicle, tax, title, registration, fees.
Out the door, same basis. Plus an inspection at your own shop.
Nothing. This is what you are paying the premium for.
Battery. A six-year-old car would have needed one; a three-year-old one is on borrowed time.
Cumulative at 12 months
Original tires, roughly half worn.
Four tires and an alignment. The car came to you with tread left, and it ran out.
Brakes — pads and rotors, one axle.
Cumulative at 24 months
Whatever factory coverage applies is doing its job, or nothing has happened yet.
The reserve, spent. A wheel bearing and a sensor, in our illustration — the unbudgeted thing that is the real argument against a used car.
Cumulative at 36 months — total cash out
The number we won't invent
Cash out over three years: $32,600 against $24,620, a difference of $7,980. The used car spent more on everything except the thing that mattered, and still finished eight thousand dollars ahead.
But at month 36 you own two different cars. The new one is now three years old. The used one is six. One of them is worth more than the other, and that difference is the missing term. So instead of a percentage, here is the test:
For the new car to have been the better financial decision, it has to be worth at least $7,980 more at month 36 than the six-year-old car is worth at the same moment.
That is a question you can answer in ten minutes with a valuation site and the two model years in question. Look up what a three-year-old example sells for and what a six-year-old one sells for, take the difference, and compare it to $7,980. If the gap is bigger, the new car won. If it is smaller, the used car did. We are not going to tell you which, because the answer genuinely differs by model, and any figure we published would be wrong for most readers.
What this timeline does not price
Risk distribution. The used column has a $1,200 reserve in it as a single tidy line. In reality that money arrives as a phone call on a Tuesday. Two people with identical finances can feel very differently about the same expected cost depending on when it lands.
Time and attention. Inspections, a shop relationship, a Saturday spent on a lift. Real costs that do not show up in dollars.
The three-year-old car's own history. Every figure above assumes a sound used example that was inspected before purchase. A used car bought without that step has a completely different distribution of outcomes, and no timeline can rescue it.
Where the used case is strongest. Not in the purchase price — in the fact that somebody else absorbed the steepest part of the depreciation curve and you inherited the car afterward. Where it is weakest is the reserve line. If $1,200 arriving unannounced would be a genuine problem, that is a real argument for the newer car, and it is a better argument than any of the arithmetic.
Every dollar figure on this page is arithmetic we performed from assumptions we chose and stated, for illustration only. They are not averages, survey results, or observed prices for any vehicle. No resale value, depreciation rate, insurance premium, warranty term or financing rate is asserted anywhere here — look those up for the specific cars you are comparing.
Related reading
- Shopping by price, not payment Two buyers, one car, and the two different places the payment path and the price path end.
- Where you buy changes what you pay Franchise, independent, private party, online. The same car, four different deals.
- Color, options, and what holds value Three questions that explain resale without a single invented percentage.