Used vs New Car at $100k Income: 5-Year True Cost

A new vehicle in the U.S. sold for an average of $50,326 in December 2025 — an all-time high, according to Kelley Blue Book. A three-year-old used vehicle averaged $31,548 in the first quarter of 2026, per Edmunds. The sticker gap is roughly $18,800. The five-year ownership gap is something else entirely, and it is the only number that matters when deciding which car actually costs less to live with.

Most coverage stops at the purchase price. That framing treats the “used car saves you money” claim as self-evident — buy the cheaper asset, pocket the difference. The break-even math is messier. A used buyer borrows at nearly double the interest rate, absorbs higher repair exposure, and skips the steepest slice of the depreciation curve the original owner already ate. Some of those forces widen the gap; one of them narrows it sharply. This analysis decomposes the five-year cost of each path, isolates where the savings are real versus nominal, and calculates the Finluxy True Savings Rate for the used option against the new baseline.

The numbers that decide it

Five figures frame the entire question. Each is sourced and dated; everything downstream is built from these.

Sources: Kelley Blue Book / Cox Automotive (Dec 2025 ATP report); Edmunds Q1 2026 Used Car Report and True Cost to Own depreciation data; Experian State of the Automotive Finance Market, Q1 2026.

Note the loan rate spread. calculating real savings on a deal starts with the financing line because it is the cost most buyers misjudge. Used-car APRs ran 11.43% in the first quarter of 2026 against 6.39% for new, per Experian — the used rate is nearly double. A $150k+ household with super-prime credit (781+) does better than both averages: Experian put the super-prime new-car rate at 4.66% in Q4 2025. But the structural penalty on used financing persists across every credit tier, and it eats directly into the price discount.

Depreciation: the cost you never write a check for

Depreciation is the largest line in any five-year ownership total, and it is the entire case for buying used. Edmunds data shows a new car loses about 23.5% of MSRP in the first year and roughly 60% across five years; KBB puts the five-year figure near 55–60%. The first-year drop alone exceeds what most owners pay in fuel and insurance combined over the same span.

Buy the three-year-old car and the first owner has already absorbed the steepest part of that curve. Edmunds reported three-year-old vehicles retained just 66% of original MSRP in Q1 2026 — a five-year low in retention, which is precisely what makes the used side attractive right now. The depreciation a used buyer faces over their five-year hold (years three through eight of the vehicle’s life) is shallower in percentage terms than what a new buyer faces over years one through five.

Run it on the average vehicle. A new car bought at $50,326 and held five years sheds about 60% — roughly $30,200 in depreciation, leaving around $20,100 in residual value. The used car bought at $31,548 (already at 66% retention) depreciates over its next five years at a flatter rate; modeling the later-life curve at roughly 45–50% of its purchase value puts its depreciation near $14,200–$15,800. Depreciation is where the used buyer captures the bulk of real savings — on the order of $14,000–$16,000 over the hold.

Depreciation rates: Edmunds True Cost to Own and Q1 2026 Used Car Report (23.5% year-one, ~60% five-year, 66% three-year retention); KBB Car Depreciation, 2026. Dollar figures are modeled estimates applying these published rates to average transaction prices; individual models vary widely (year-one depreciation ranges 6%–45% per Edmunds).

Financing: where the used discount leaks back out

Here the used advantage reverses. The same Experian rate spread that looks like a footnote compounds into thousands over a five-year loan.

Take the average loan amounts Experian recorded for Q1 2026: $43,925 financed on a new vehicle, $27,070 on a used one. At the average new rate of 6.39% over 60 months, the new buyer pays roughly $7,500 in interest. At the average used rate of 11.43% over 60 months, the used buyer — despite borrowing $16,855 less — pays roughly $8,400 in interest. The cheaper asset generates more total interest. That is the financing penalty doing its work, and it claws back close to $900 of the depreciation savings before fuel, insurance, or repairs enter the picture.

The super-prime borrower bends this differently. A $150k+ household financing the used car at a credit-union or super-prime used rate well below the 11.43% average changes the arithmetic — which is exactly why credit tier matters more than the headline averages suggest. The break-even point on refinancing a loan follows the same logic: a rate cut of a few points on a five-figure balance moves the total cost by thousands. For anyone in this income band, the used-car decision is partly a financing decision, and the financing is negotiable in a way the depreciation curve is not.

Loan amounts and APRs: Experian State of the Automotive Finance Market, Q1 2026 (via LendingTree, NerdWallet). Interest totals are standard amortization estimates on the stated balances and terms; actual figures vary with down payment, term, and credit tier. Super-prime row is illustrative of the rate a 781+ borrower may access, not a published average.

The components most comparisons skip

Insurance, fuel, maintenance, and repairs round out Edmunds’ True Cost to Own framework. They split unevenly between the two paths, and the conventional wisdom — “used cars cost more to maintain” — is only half right.

Insurance tilts toward the used car as a saving. Premiums track vehicle value, so insuring a $31,548 car costs less than insuring a $50,326 one, particularly on comprehensive and collision coverage where the payout ceiling is the car’s worth. Fuel is roughly a wash on equivalent vehicle classes, since a three-year-old version of the same segment burns gas at nearly the same rate as the new one.

Maintenance and repairs cut the other way. The new vehicle spends its first three to five years largely under factory warranty, pushing repair costs toward zero in the early hold. The used vehicle, entering years three through eight, is past most warranty coverage and into the period where wear items — brakes, tires, suspension, the occasional larger repair — come due. This is the real maintenance premium on used, and it partially offsets the insurance and depreciation savings. It does not erase them. Edmunds’ own True Cost to Own data consistently shows depreciation dwarfing repairs across a five-year hold; the repair gap is measured in low thousands, the depreciation gap in tens of thousands.

One segment-specific wrinkle worth flagging for this market: used EVs. Edmunds reported five-year-old EVs depreciating at 57.2% versus 41.8% for the overall market, with off-lease EV inventory projected to rise 25.7% in 2026. That steeper depreciation is a buyer’s gain on the used side — a three-year-old EV bought now has already shed an outsized share of its value, and the wave of off-lease supply is pushing prices lower still. The trade-off is battery-age uncertainty, which functions as an unquantified repair-risk line.

Finluxy True Savings Rate: the used path scored against new

The Finluxy True Savings Rate measures net savings after all real costs, divided by the baseline spend — here, the five-year cost of the new vehicle. Net savings is the used path’s gross depreciation-and-insurance advantage minus its financing penalty and incremental repair exposure.

Assembling the components on the average vehicle: the used path saves roughly $14,000–$16,000 in depreciation and an estimated $1,500–$2,500 in insurance over five years. Against that, it carries roughly $900 in extra financing interest at average rates (or a saving if super-prime) and an estimated $2,000–$3,500 in incremental maintenance and repairs once out of warranty. Net savings land in the range of $11,000–$15,000.

Baseline spend — the new vehicle’s full five-year cost including depreciation, financing, insurance, fuel, and upkeep — sits in the broad vicinity of $55,000–$62,000 on the average new car, consistent with Edmunds True Cost to Own totals for mainstream vehicles in this price band. Figure unavailable at publication as a single verified point — Edmunds did not return a model-agnostic five-year TCO aggregate for this period; the range reflects published per-model TCO totals scaled to the average transaction price.

Component figures modeled from: Edmunds Q1 2026 depreciation and True Cost to Own data; Experian Q1 2026 finance averages; KBB Dec 2025 transaction prices. Rate = net savings ÷ baseline spend × 100. Range reflects credit tier, model, and state variation. A super-prime borrower at below-average used rates pushes the rate toward the top of the range; a buyer financing at the full 11.43% average and hitting major repairs lands near the bottom.

A Finluxy True Savings Rate of roughly 19% to 25% means the used path delivers real savings — not the 37% the raw sticker gap ($18,800 on $50,326) would imply. The difference between those two numbers is the entire point. The sticker discount is nominal savings; the True Savings Rate is what survives after financing, insurance, and repair reality. Close to a third of the headline discount evaporates once the full cost structure is accounted for, and it evaporates fastest for buyers with weaker credit.

What the data shows that most coverage misses

The overlooked finding is not that used cars save money — it is that the savings are concentrated almost entirely in one line and are actively eroded by another. Depreciation avoidance accounts for the overwhelming majority of the used buyer’s advantage. The financing penalty is the single largest force working against it, and it is the only major component the buyer can change after the fact.

This inverts the usual advice. Conventional guidance frames the used-versus-new choice around reliability and repair risk — “you’re buying someone else’s problems.” The Q1 2026 data says repairs are a real but secondary cost, dwarfed by depreciation. The decision that actually moves the five-year total is not which car you pick but how you finance it. A used buyer who shops the loan as hard as the vehicle — credit union, super-prime rate, shorter term — can convert a 19% True Savings Rate into something closer to 25%. A used buyer who takes dealer financing at the 11.43% average gives a meaningful slice of the discount straight back. The same discipline that applies to decomposing a bundle deal’s true value applies here: the advertised saving and the realized saving are different numbers.

For the $150k+ household

At this income level the used-versus-new decision is rarely about whether the payment fits — it is about opportunity cost, the return that capital tied up in a depreciating asset forgoes elsewhere. A $50,326 new vehicle commits roughly $18,800 more upfront capital than the used alternative. Deployed in markets or retained as liquidity rather than sunk into year-one depreciation, that difference compounds. For a household already maxing tax-advantaged accounts, the spread between a 19% and 25% True Savings Rate is real money, but it is small relative to what the freed-up capital does over the same five years.

The trade-offs that actually matter at $150k+ are non-financial as often as not: warranty coverage and predictability buy convenience, and convenience has value to a time-constrained household even when the spreadsheet favors used. The financially optimal move on the average vehicle is the lightly-used, post-steep-depreciation car financed at a super-prime rate — that combination captures the depreciation savings without surrendering them to the financing penalty. The threshold worth watching is credit tier and rate access: if you can borrow on the used car at or below the new-car average rate, the used path’s True Savings Rate holds near its ceiling. If you cannot, and the convenience of warranty coverage carries real weight for your schedule, the gap narrows enough that buying new is a defensible call rather than a wasteful one. The math favors used; it does not command it, and the size of that edge depends more on the loan you negotiate than on the badge you choose.