Question 1

What is the typical depreciation curve for a new car?

Accepted Answer

Industry-average depreciation (Kelley Blue Book, NADA, Black Book methodology): Year 1: 15-20% of MSRP. Year 2: 10-15%. Year 3: 8-12%. Year 4: 6-10%. Year 5: 5-8%. Cumulative 5-year: 40-60% of MSRP. So a $35,000 vehicle might be worth $14,000-21,000 after 5 years. The curve is steep in Years 1-3, then flattens. Vehicles reach their 'floor' value (around $3,000-6,000 for most makes) around Year 12-15. Beyond the floor, depreciation cost per mile approaches zero.

Question 2

Which cars depreciate the fastest and slowest?

Accepted Answer

Fastest depreciating (5-year residuals 30-40% of MSRP): Dodge, Chrysler, Lincoln, Buick, Maserati, Jaguar. Slowest depreciating (5-year residuals 50-60%+): Toyota Tacoma, Toyota 4Runner, Jeep Wrangler, Honda Civic, Toyota Camry, Subaru Outback. Factors driving low depreciation: reputation for reliability (lower expected repair costs = higher resale demand), limited supply vs demand (Tacoma, 4Runner, Wrangler), strong fleet demand from rental agencies. The calculator accepts a vehicle-specific depreciation factor you can customize based on make/model data.

Question 3

How does mileage affect depreciation?

Accepted Answer

The 'mileage penalty' — value lost per mile above the standard benchmark (~12,000 miles/year for the vehicle's age) — averages $0.10-0.20/mile in diminished resale value. NADA and KBB explicitly adjust residual values for mileage vs average. A vehicle 20,000 miles above its peer group might be worth $2,000-4,000 less. At the same time, a low-mileage vehicle commands a premium. The calculator models mileage-adjusted depreciation based on your expected annual mileage vs the category average.

Question 4

When is the optimal time to sell or trade a car?

Accepted Answer

The optimal sell timing depends on your objective: (1) Minimize depreciation cost per mile: generally 3-5 years, when the steepest depreciation is complete but before major maintenance events. (2) Minimize total cost of ownership: generally 7-10 years, after the loan is paid off and depreciation rate slows to match maintenance cost increase. (3) Maximize trade-in leverage at dealership: before 100,000 miles (many certified pre-owned programs cap at 80,000 miles), before the first major scheduled maintenance (timing belt/chain, transmission service). The calculator surfaces the depreciation cost per mile by year to make this trade-off explicit.

Question 5

How do I use this to evaluate a used car purchase?

Accepted Answer

For a used vehicle, the relevant depreciation is the future depreciation from your purchase price to your estimated sale price. A 3-year-old vehicle that has already dropped 40% from MSRP will depreciate much more slowly going forward — this is the 'sweet spot' that many financial advisors recommend. Input: purchase price (your price, not MSRP), current odometer, expected hold years, expected annual miles. The calculator outputs depreciation cost per year and per mile for the remaining hold period, with KBB/NADA residual benchmarks.

Question 6

What is the difference between KBB and NADA valuations?

Accepted Answer

Both publish wholesale (dealer auction), trade-in, and private party valuations for used vehicles. KBB (Kelley Blue Book, owned by Cox Automotive) tends to be more consumer-facing and widely referenced in private party transactions. NADA (National Automobile Dealers Association) Guides are more commonly used by dealerships and lenders for trade-in and loan collateral valuation. In practice, they track similarly but may diverge by 3-8% for specific vehicles. Dealers typically use whichever is lower for trade-in offers. This calculator uses both as bracketing benchmarks.

Car Depreciation Calculator

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