New Car vs Used Car: The 2026 TCO Guide

The 60-second rule

Never compare sticker prices. Compare total cost of ownership: down payment + all loan payments + (insurance + maintenance) × years − resale value. The sticker gap is $22,000, but that is the least honest number in the dealership. The loan on the new car is $43,200 at 7.0% — $855.41 a month — against $23,400 at 9.5% for the used car, $491.44 a month. Then the new car loses $25,509.73 of value over five years while the used car loses $10,990.29. Run the full formula and the winner is the used car, by $17,557.54.

Three clarifications make this rule honest. First, the two cars are the same class — this is not a new luxury car against a used beater. Second, depreciation is a modeled estimate (20/15/13/12/10% of remaining value for new, 12/11/10/10/9% for used), not a quote; real curves vary. Third, the monthly payment is the number you feel, but the five-year TCO is the number that decides — never buy on the payment alone.

The worked example, line by line

Setup: $48,000 new, $26,000 used (3 years old), 10% down on each, 5-year loans at 7.0% new / 9.5% used, insurance $2,300/$1,600 a year, maintenance $600/$1,100 a year, 5-year horizon.

The loans. New: $43,200 financed at 7.0% for 60 months → $855.41 a month, $51,324.71 total. Used: $23,400 financed at 9.5% → $491.44 a month, $29,486.61 total. Two things jump out: the used loan costs $21,838.10 less despite the higher rate (principal beats rate), and the new buyer pays $363.97 more every single month.

Resale after five years. New: $48,000 × 0.80 × 0.85 × 0.87 × 0.88 × 0.90 = $22,490.27. Used: $26,000 × 0.88 × 0.89 × 0.90 × 0.90 × 0.91 = $15,009.71. Yes, the new car holds $7,480.56 more value — and still loses $25,509.73 against the used car's $10,990.29 of value lost. The new car's resale advantage is real and nowhere near enough.

Carrying costs. Insurance plus maintenance, five years: new 5 × $2,900 = $14,500; used 5 × $2,700 = $13,500. The new car costs more to insure, the used car costs more to fix, and they nearly cancel out — only $1,000 of the $17,557.54 gap comes from here.

The verdict: new TCO = $4,800 down + $51,324.71 in payments + $14,500 carrying − $22,490.27 resale = $48,134.44; used TCO = $2,600 + $29,486.61 + $13,500 − $15,009.71 = $30,576.90. The used car wins by $17,557.54.

Branch one: cheap used at $18,000

The genuinely cheap used car. Used TCO falls to $25,322.47; the gap grows to $22,811.97 — basically the price of the new car cut in half against it. This is the branch that makes used-car shopping worth the effort: every $1,000 you negotiate off the used price is a full $1,000-plus of TCO savings, since the loan and depreciation both shrink with it.

Branch two: pricey used at $33,000

The pessimist's branch. Used TCO rises to $35,174.53; the gap narrows to $12,959.92 — but the used car still wins by nearly thirteen thousand dollars. Even an expensive used car beats a new one on dollars alone. It takes an extreme combination — a pricey used car plus a sweetheart new-car deal — to even approach a tie.

Branch three: the 10-year horizon

The long game. New TCO reaches $71,844.43 against used at $49,193.99 — the gap widens to $22,650.44. Once both loans are paid off, the new car keeps depreciating harder and insuring dearer. Time is the used buyer's friend: the longer you keep a car, the more the original sticker gap matters and the less the monthly payment matters.

Branch four: 4.9% new-car promo APR

The dealership's favorite weapon. At 4.9% the new TCO falls to $45,605.31; the gap narrows to $15,028.41. A subsidized rate helps — it shaves $2,529.13 off the new car's cost — but it cuts thousands, not the $22,000 sticker gap. The crossing point slides from month 28 to month 30, and the used car still wins.

The month-28 crossing

Here is the honest nuance: the two cost lines cross exactly once, at month 28. Before that, the new car looks cheaper on paper because it holds more resale value — after a year it is still a $38,400 asset against the used car's $22,880. But that resale value is only real if you sell, and every month the used car's lower payment and slower depreciation eat into it. At month 28 the used car pulls ahead for good. At every whole-year checkpoint from year 3 on, the used car wins. If you trade cars every two years, the gap is small; if you hold for five, it is $17,557.54.

Three expensive mistakes

1. Buying on the monthly payment. $855.41 vs $491.44 feels like a $363.97 difference; over five years with depreciation and carrying costs it is a $17,557.54 difference. The payment is the number you feel, the TCO is the number that decides. Run the new vs used car calculator with your real prices before signing anything.

2. Assuming the higher APR makes used expensive. 9.5% sounds scary next to 7.0% — until you see the totals: $29,486.61 vs $51,324.71. Principal beats rate. A higher rate on a much smaller loan is still a much smaller loan. Judge the loan by its total, not its rate.

3. Forgetting insurance and maintenance spreads. Buyers price the loan and the sticker and stop. The new car costs $700 more a year to insure; the used car costs $500 more a year to fix. Neither side is free — add your real quotes to both sides, because on some cars these spreads are much wider than the 2026 estimates here.

Your move: run your real prices, your real APRs, and your real insurance quotes in the new car vs used car calculator — then check the new vs used true-cost calculator for the repair-differential angle, and the pay cash vs finance page if you are considering skipping the loan entirely.