How Used Car Depreciation Works (And What It Means for Your Budget)

Why your car is worth less every month

The moment you drive a new car off the lot, it's worth less than you paid. This isn't a myth — it's the most predictable financial event in car ownership. New vehicles in Australia typically lose 15–25% of their value in the first year alone, and 40–60% over the first three years.

Understanding this curve doesn't just satisfy curiosity — it directly affects how much you should pay for a used car, when to sell yours, and whether that 'great deal' on a 12-month-old vehicle is actually worth it.

Use the Used Car Value Calculator to estimate what a vehicle is worth at any age based on its purchase price and depreciation rate.

The depreciation curve: what it actually looks like

Depreciation is sharpest in the early years and flattens as the car ages. A typical pattern for a popular Australian model might look like this:

• Year 1: Loses 20% of purchase price (new → 12 months)
• Year 2: Loses another 12%
• Year 3: Loses another 10%
• Years 4–7: Loses 6–8% per year
• Years 8+: Decline slows significantly; some vehicles reach a floor

On a $45,000 new car, you'd be looking at roughly $36,000 after year one, $31,700 after year two, and $28,500 after year three. The car has already shed $16,500 in value before its first major service interval.

The sweet spot for buying used

The best-value window for most buyers is 3–5 years old. By this point:

• The steepest depreciation has already happened — you're not the one absorbing it
• The car is still modern enough to have current safety features and reasonable fuel efficiency
• Most manufacturer warranties have expired, but the vehicle is young enough to be reliable
• You can usually still get logbook servicing and parts at reasonable costs

This is why 3-year-old ex-lease vehicles are so popular in Australia. The original buyer absorbed the worst of the loss; you benefit from a lower purchase price on a well-maintained car.

Factors that accelerate depreciation

Not all cars depreciate at the same rate. These factors push depreciation higher:

• High annual kilometres: Every 10,000 km above average (around 15,000 km/year) reduces resale value
• Unpopular colours: Unusual colours (green, brown, orange) sell for less than white, silver, or black
• Luxury or prestige brands: High-end European cars often depreciate faster than Japanese reliability brands
• Diesel passenger cars: Declining demand for diesel in urban areas has accelerated depreciation on city-spec diesels
• Accident history: Even properly repaired vehicles take a significant value hit on their PPSR or CarHistory report

What slows depreciation

Some vehicles hold value better than others:

• Toyota, Lexus, and Mazda: Consistently strong resale in Australia due to reliability reputation
• Utes and 4WDs: High demand from tradespeople and regional buyers keeps values elevated
• Low-kilometre examples: Under 10,000 km/year commands a meaningful premium
• Full service history: Logbook servicing at authorised dealers protects resale value

Keeping your car clean, serviced, and well-maintained is directly worth money at resale. A quality car care kit — see car detailing kits on Amazon Australia — pays for itself many times over if you ever plan to sell privately.

Running costs compound the true ownership picture

Depreciation is the biggest single cost of car ownership, but fuel and running costs aren't far behind. Use the Fuel Cost Calculator to factor in fuel spend over your ownership period, and the Car Loan Calculator if you're financing the purchase. Looking at all three numbers together gives you the real cost of ownership.

Timing your sale

If you own a car and are thinking about when to sell, the answer is almost always: sooner is better, provided you've absorbed at least 2–3 years of initial depreciation yourself. Selling a 3-year-old car privately typically nets more than selling a 6-year-old car, even accounting for the extra years of use. The drop in depreciation rate at 5+ years is real, but by then accumulated wear and buyer nervousness about reliability starts eroding private sale prices anyway.

Tax treatment: when depreciation becomes a tax deduction

If you use your car for work purposes, the depreciation you experience might translate into actual tax deductions. But the way the ATO treats car depreciation depends entirely on which claiming method you choose.

Under the logbook method, you can claim depreciation (the ATO calls it 'decline in value') as part of your deduction. If your car cost $40,000 and you use it 60% for work based on a valid 12-week logbook, you can claim 60% of the decline in value each year using the ATO's diminishing value or prime cost depreciation schedules.

The depreciation limit for cars first used or leased for income-producing purposes is currently $68,108 for the 2024-25 financial year (up from $64,741 in 2023-24). Even if your luxury SUV cost $90,000, you can only calculate depreciation deductions on the first $68,108. This cap exists to prevent excessive deductions on prestige vehicles.

Under the cents per kilometre method (87 cents per km for 2024-25), you can't claim depreciation separately. It's already factored into the rate, along with fuel, servicing, insurance, and registration. You simply claim up to 5,000 business kilometres at the set rate.

If you're a sole trader or run a business that owns the vehicle outright, the depreciation deduction directly reduces your taxable income. For someone on a marginal tax rate of 37%, every $1,000 in legitimate depreciation deductions saves $370 in tax.

Worth noting: if you're claiming depreciation under the logbook method and then sell the car for more than its written-down value, the ATO may include part of the sale price as assessable income (a balancing adjustment). If your tax depreciation schedule says the car is worth $18,000 but you sell it privately for $22,000, that $4,000 difference could be taxable to the extent it relates to your business use percentage.

This is why keeping accurate records matters. A spreadsheet showing purchase price, business use percentage, and annual depreciation claims will save confusion when you eventually sell. And if you're not sure whether the logbook or cents per kilometre method works better for your situation, the numbers are worth running both ways before you commit to one method for the year.

Worked example: Sarah's three-year ownership in Melbourne

Sarah bought a 2021 Mazda CX-5 Touring in January 2022 for $42,000 driveaway in Melbourne. She had $12,000 saved and financed the remaining $30,000 over five years at 7.5% interest through her credit union.

Her monthly loan repayment worked out to $601. Over three years (36 months), she paid $21,636 in repayments, of which roughly $6,200 was interest and $15,436 went toward the principal. She still owed about $14,564 when she decided to sell in early 2025.

During those three years, the CX-5 depreciated roughly in line with the typical curve:

• January 2023 (12 months): Lost 18%, worth approximately $34,440
• January 2024 (24 months): Lost another 11%, worth approximately $30,650
• January 2025 (36 months): Lost another 9%, worth approximately $28,000

Sarah sold the car privately on Carsales for $28,500 after some negotiation. She used that money to pay out the remaining loan balance of $14,564, leaving her with $13,936.

Here's how her actual three-year cost of ownership stacked up:

• Purchase price: $42,000
• Sale price: $28,500
• Depreciation loss: $13,500
• Interest paid: $6,200
• Registration (VIC, 3 years): $2,490 ($830/year average)
• Insurance (comprehensive, 3 years): $3,600 ($1,200/year average)
• Servicing (three annual services): $1,350
• Fuel (15,000 km/year, 7.5L/100km, $1.75/L average): $5,900

Total three-year cost: approximately $32,040, or $10,680 per year, or $890 per month. Depreciation alone represented 42% of her total running costs over that period.

The $13,936 she walked away with after the sale was less than her original $12,000 deposit, meaning the car effectively cost her everything she put into it. But because she sold at the three-year mark rather than holding it for six or seven years, she maximised her return relative to the depreciation curve and moved into a newer vehicle while her CX-5 still had strong buyer appeal.

If Sarah had kept the car for another three years to 2028, she would have paid off the loan entirely but the car's value would likely have dropped to around $19,000–$21,000, meaning another $7,500–$9,000 in depreciation. Selling at year three was the financially optimal exit point for her circumstances.

Common mistakes that cost thousands

Even buyers who understand depreciation in theory make avoidable errors that amplify the financial hit. Here are the most common and costly:

Buying too new when budget is tight

Financing a nearly-new car (12–18 months old) feels like a compromise between new-car appeal and used-car savings. But if you're stretching to afford the repayments, you're still absorbing heavy depreciation on a depreciating asset while paying interest. A three or four-year-old version of the same model costs 30–40% less and the depreciation rate has flattened. The savings on both purchase price and interest often fund better insurance, maintenance, or simply reduce financial stress.

Ignoring total cost of ownership

Buyers fixate on purchase price or monthly repayments and forget that some cars are expensive to run. A prestige European sedan might cost the same as a Toyota Camry at three years old, but servicing, parts, insurance, and fuel costs can be double. The depreciation curve looks similar, but your annual outgoings don't. Always estimate running costs over your ownership period, not just the sticker price.

Selling too early after buying used

If you buy a three-year-old car and sell it 12 months later, you're re-entering the market at a disadvantage. Transaction costs (transfer fees, safety certificates, advertising if selling privately, or dealer margin if trading in) combined with another year's depreciation mean you lose money twice. Aim to hold a used purchase for at least two to three years to justify the transaction friction.

Modifying without considering resale

Aftermarket wheels, suspension, exhaust, or body kits might suit your taste, but they narrow your buyer pool dramatically when you sell. Most buyers want stock or near-stock vehicles. Even quality modifications rarely add resale value and often subtract it. If you must modify, keep the original parts and budget for the cost of returning the car to stock before sale.

Neglecting service history documentation

A car serviced on time is worth more than one with gaps or no proof. But the documentation matters as much as the work itself. Receipts from a backyard mechanic aren't valued the same as a stamped logbook from an authorised dealer, especially for prestige and European brands. Saving $100 per service at an independent workshop might cost you $1,500–$2,000 at resale if buyers discount your asking price due to incomplete history.

Overestimating the value of low kilometres alone

A 10-year-old car with 60,000 km sounds appealing compared to one with 150,000 km, but if it's been sitting unused for long periods, seals dry out, fluids degrade, and components seize. Buyers who know cars are wary of extremely low-kilometre older vehicles. Consistent annual use (10,000–15,000 km/year) is healthier for a car than sporadic use, and savvy buyers know this. Don't overpay for suspiciously low odometer readings without a clear explanation and solid service records.