A used car usually wins on upfront cost and immediate depreciation, while a new car can make sense if you value peace of mind, warranty cover, lower early maintenance and specific incentives (especially for EVs). Which is cheaper depends on how long you keep the car, your driving pattern, insurance profile and whether you buy electric or petrol. Below I break the numbers and the real life trade offs down so you can make a clear, Aussie specific decision.

1: The biggest cost: Depreciation (new cars lose value fast)

Depreciation is the single largest cost difference between new and used cars.

• Typical pattern: new cars can lose ~10–15% of value the moment you drive them off the lot, and another ~10–15% during the first year, then steady decline afterwards. This front-loaded loss is what makes used cars so attractive from a pure cost standpoint.

Practical takeaway: If you buy new and keep the car 8–10+ years, the annualised depreciation may become reasonable; if you keep it 1–3 years, depreciation dominates your total cost of ownership.

2: Upfront purchase price vs what you can buy used

• Upfront: New car list prices in Australia remain high compared to a few years ago (supply issues, inflation, and OEM pricing pressure). Industry forecasts show the market is still large but pricing pressures persist into 2025–26.

• Used market: After the pandemic-driven used-car boom softened, used listings and demand have eased (late-2025 into 2026), which can mean better deals for used-car buyers if you shop carefully. 

Practical numbers (example): A well-kept 2–3-year-old version of a popular midsize car that costs $40,000 new might be available for $26,000 to $32,000, depending on the model, mileage, and area. That money saved up front quickly makes up for a lot of ongoing costs.

3: Running costs: Fuel, servicing and insurance (the ongoing expenses)

Fuel

Fuel prices in Australia have been volatile. National weekly averages in early 2026 are around ~$1.79 per litre for petrol (approx.) with strong local variation  metro areas like Brisbane or parts of NSW can be notably higher. Use local price apps (FuelCheck, PetrolSpy) to time fills. 

• Used petrol car: ongoing petrol bills are probably your largest running cost after depreciation and insurance.
• New petrol car / hybrid: improved fuel economy can lower this, but the saving vs a used petrol car depends on real-world km and hybrid efficiency.
• EV: energy cost per km is often lower than petrol equivalents, but charging costs vary (home vs public fast chargers) and the upfront EV price is still generally higher. For many Australians, EVs are starting to make sense on running cost alone particularly city drivers but it depends on your usage and local electricity rates.

Servicing & repairs

• New car: warranty cover often reduces servicing costs in early years, plus lower likelihood of sudden repairs.
• Used car: older cars can be more expensive if big items (timing belt, clutch, brakes, battery) are due but a pre-purchase inspection and a known service history mitigates this risk.

Insurance

The average cost of car insurance depends on the type of car and where it is located. The national average for a comprehensive insurance is around $900 to $1,400 a year, but this varies by state, coverage level, and type of driver. Recently, premiums have been going up. Older cars usually cost less to cover, but not always. Some older models that need a lot of work can cost more to insure.

4: Incentives, taxes and government rules (big for EVs and depreciation)

• EV incentives: Several states (and sometimes federal schemes) offer rebates, registration discounts or other incentives for electric vehicles  for eligible cars these can be thousands of dollars (some states have $3,000-style rebates or duty concessions tied to price caps). That can materially change the new-vs-used calculation if you’re choosing an EV.
• ATO thresholds & depreciation rules: If you are buying for business use, tax rules and car limit thresholds affect the net cost (e.g., ATO car limit thresholds and cents-per-km claims). Check the ATO pages or your accountant for the precise year-specific limits.

5: A realistic 5-year ownership model (worked example)

Below is a simplified, illustrative scenario (replace with exact model prices for your case).

Assumptions (example):

• New car price: $40,000
• Equivalent 3-year used: $30,000
• Ownership: 5 years, 15,000 km/year
• Fuel: Petrol $1.80/L (avg) or EV home charge cost est. (varies)
• Insurance: $1,000/year (avg)
• Servicing & repairs: new = $500/year early, used = $900/year later
• Depreciation: new loses 40% in 5 years, used loses 25% in next 5 years

Rough 5-year tallies (rounded):

• New car total cost (price + depreciation + fuel + insurance + servicing): maybe $40k + $16k depreciation + $13k fuel + $5k insurance + $2.5k servicing ≈ $76.5k
• Used car total cost (price + depreciation + fuel + insurance + servicing): maybe $30k + $7.5k depreciation + $13.5k fuel + $5k insurance + $4.5k servicing ≈ $60.5k

In this contrived example the used car is ~$16k cheaper over 5 years. Your numbers will differ by model, fuel type, and driving pattern but this demonstrates how front-loaded depreciation and higher servicing risk push used cars into a clear cost advantage for many buyers.

6: When a new car can be cheaper (or better value)

There are scenarios where buying new is smarter:

• You keep cars a long time (8–10+ years) the front-loaded depreciation evens out.
• You prioritise warranty/low-maintenance: new cars often have multi-year warranties and lower early repair risk.
• You want the latest safety/efficiency tech: improved fuel economy, safety systems and emissions can save money and reduce risk.
• EV with incentives: state/federal rebates plus lower running costs can tip the balance for city drivers  but check local incentives and price caps carefully.

7: Non-financial factors you must weigh

• Reliability & stress: a new car gives peace of mind; a used car may require more time dealing with servicing.
• Financing: used cars can have higher finance rates; new car finance deals (promotional rates) sometimes make monthly payments comparable.
• Insurance excess & history: used cars with clean service history command lower friction in transfers and may be easier to insure.
• Resale market & region: Regional demand affects used-car prices; some markets (e.g., smaller towns, particular body styles) hold value differently. Recent reports show the used market softened in late-2025 which can be an opportunity to negotiate.

8: Practical guide: How to choose (step-by-step checklist)

1. Decide your horizon: How long will you keep the car? (<3 yrs → favour used; 8+ yrs → new becomes reasonable).
2. Calculate total cost of ownership (TCO): price + expected depreciation + fuel + insurance + servicing + registration (use local numbers).
3. Check incentives: if considering EV, check state/federal rebates and any stamp-duty concessions.
4. Get a PPI (pre-purchase inspection) for used cars — it saves large surprises.
5. Compare finance offers (new vs used often have different rates).
6. Factor in non-monetary value: safety tech, reliability, dealer network, towing/roadside assistance.
7. Shop local prices: Petrol and insurance vary by state use local data (FuelCheck, insurer quotes).

9 Quick regional notes for Australians (2026)

• Petrol price volatility: Expect strong local variation; metropolitan nodes like Brisbane saw some of the highest average prices in recent reporting. Shop local or time your fill.
• Used market: Softer demand into late-2025/early-2026 suggests negotiating power for buyers in many regions  but some models still hold value strongly.
• Insurance: Premiums have been rising; always obtain multiple quotes and consider switching annually for savings (Canstar research suggests substantial savings are available by shopping around).

10) Bottom line — Decision framework

• If you want lowest total cost in the short–medium term (1–5 years) → used car is typically cheaper.
• If you want low effort, warranty cover, latest safety, and you keep cars many years → new car becomes more attractive.
• If you are considering an EV and local incentives + charging options work for you, an EV (new or low-km used) can beat petrol in running cost  but check rebates, price caps and your electricity pricing.

11: Summary Table: Quick Comparison

Conclusion

In 2026 Australia, buying a used car especially one that's 2–3 years old is generally the cheaper option when you look at the full cost of ownership. That said, the gap is narrowing as new EV incentives and financing improvements make new cars more accessible. Your choice ultimately depends on your priorities: cost savings versus convenience, customization, and long term ownership comfort.