
Understanding car depreciation in Australia is essential for making informed decisions about buying, selling, or maintaining a vehicle. Car depreciation refers to the decrease in a car's value over time due to various factors such as wear and tear, market demands, age, and mileage. The Australian Taxation Office (ATO) provides guidelines for calculating and claiming motor vehicle depreciation for tax purposes, including the straight-line method and the diminishing value method. Additionally, factors such as brand reputation, consumer trends, and vehicle storage can impact a car's depreciation rate. By considering these factors and utilising the tools and resources available, individuals can make more informed choices regarding their vehicles and potentially minimise the impact of depreciation.
| Characteristics | Values |
|---|---|
| Calculation method | Diminishing value method, Straight-line method, Cents per kilometre method, Logbook method, Prime cost method |
| Factors influencing depreciation | Wear and tear, Market demands, Age of the car, Mileage, Brand reputation, Model popularity, Consumer trends, Technology, Economics, Fuel efficiency, Transmission type, Modifications |
| Tools | ATO depreciation and capital allowances tool, Redbook |
| Average lifespan of a car | 5-7 years |
| Car limit for 2025/26 financial year | $69,674 |
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What You'll Learn

Calculating car depreciation
Steps to Calculate Car Depreciation:
- Record the Purchase Price or Book Value: The first step is to record the initial cost of the vehicle, also known as the sticker price or the new car price. This value is essential for subsequent calculations.
- Determine the Effective Life: Estimate the expected lifespan or useful life of the vehicle. The Australian Taxation Office (ATO) considers the effective life of a car for an individual taxpayer to be eight years. However, the average lifespan is typically considered to be between five and seven years, depending on factors such as mileage and residual value.
- Estimate the Residual Value: Determine the expected value of the vehicle at the end of its effective life. This value represents the car's worth at the end of its usage.
Methods to Calculate Depreciation:
There are two commonly used methods to calculate depreciation, each providing a different perspective on the vehicle's value over time:
- Straight-Line Depreciation Method: This method assumes that the value of the vehicle decreases evenly over its lifespan. The formula for this method is: Depreciation = Asset's cost × (days held ÷ 365) × (100% ÷ asset's effective life). This approach results in claiming a fixed amount of depreciation each year.
- Diminishing Value Method: This method recognises that a vehicle's value typically decreases more significantly in the earlier years of its life. Using this method, most of the depreciation occurs earlier, potentially reflecting the vehicle's actual value more accurately at any given time.
Additional Considerations:
When calculating car depreciation, it is important to consider factors beyond these basic formulas. Other aspects that can influence depreciation include:
- Brand and Model Reputation: Luxury brands like Mercedes-Benz, BMW, and Audi tend to depreciate more slowly due to their established reputation and demand. On the other hand, lesser-known brands may depreciate faster due to perceived lower quality.
- Consumer Trends and Market Demand: Fuel-efficient and hybrid cars are currently in demand due to escalating fuel prices and environmental concerns, leading to slower depreciation. Similarly, automatic transmissions are favoured in the Australian market and tend to retain their value.
- Storage and Modifications: Storing your car in a garage or under a carport protects it from harsh weather conditions, which can otherwise accelerate depreciation. Unnecessary modifications, unless universally appreciated, can also reduce a car's value.
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Claiming tax deductions
The first is the straight-line depreciation method, also known as the prime cost method, where a fixed amount can be claimed each year. This is calculated using the following formula:
> Asset’s cost × (days held ÷ 365) × (100% ÷ asset’s effective life)
The ATO defines the effective life of a car for an individual taxpayer as eight years, with 366 days for a leap year. This method assumes that the value of a depreciating asset decreases evenly over its lifespan.
The second method is the diminishing value approach, which tends to be favoured as it results in higher tax deductions in the initial years of ownership. This method is calculated using the following formula:
> Base Value x (Days held ÷ 365) x (200% ÷ Effective life in years)
The diminishing value method is chosen in the first tax return year of the claim and results in a higher depreciation percentage each year, as it is applied to the vehicle cost reduced by the accumulated depreciation of previous periods.
For work-related vehicles, the ATO estimates a depreciation rate of 25% per annum on a diminishing value basis, or 12.5% of the vehicle cost for eight years. This rate can also be self-assessed.
Additionally, the cents per kilometre method is available, which includes fuel, maintenance, and the decline in value of the vehicle. This method allows a deduction of 88 cents for the 2025/2026 financial year, with a maximum of 5,000 kilometres. It is important to note that only the business component of the total cost of owning and running a car may be used as a tax deduction.
The ATO has imposed a car limit for the 2025/26 financial year, set at $69,674, which is the maximum amount that can be claimed as a tax deduction and depreciation. Small businesses with an aggregate turnover of less than $10 million may be eligible for the instant asset write-off, allowing them to write off the entire value of the vehicle in the same year it was purchased.
It is worth noting that the effective life of a vehicle and its depreciation rate can be influenced by factors such as brand reputation, demand, price, and maintenance.
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$13.9 $25

Choosing resale-friendly models
When buying a car in Australia, choosing a model with a strong resale value can be a smart financial decision. Here are some factors to consider when choosing a car with good resale value:
Reliability
Australians value cars that are reliable and don't break down often. Cars that have a reputation for dependability tend to have higher resale values. The Toyota Land Cruiser, for example, is known for its durability and reliability, making it a popular choice in the used car market.
Strong Demand
Popular cars tend to hold their value because there is always someone looking to buy them. This could be due to their versatility, appealing to multiple demographics such as families, tradespeople, and adventurers. The Toyota Corolla, for instance, is one of the world's best-selling cars and holds its value well due to its practicality, reliability, and low running costs.
Brand Reputation
Well-known and established brands with a good reputation tend to hold their market value better. Brands like Toyota, Mazda, Hyundai, Ford, and Mitsubishi are popular choices in Australia and are known for their reliability and durability.
Limited Supply
Cars that are in short supply due to production delays or other factors can have higher resale values. For example, the Suzuki Jimny, a small SUV, has seen its used prices increase due to demand outstripping supply for new models.
Warranty
A longer warranty period can provide peace of mind to buyers and increase the resale value of a car. Kia's 7-year warranty, for instance, is a significant selling point for its models, such as the Sportage.
Fuel Efficiency
With the rising cost of fuel, fuel-efficient cars are becoming increasingly popular. The Mazda CX-5, for example, is a favourite among Australian families due to its stylish design, fuel efficiency, and well-equipped interior.
When choosing a car with good resale value, it's essential to consider factors such as reliability, popularity, brand reputation, limited supply, warranty, and fuel efficiency. These factors can help you make a smart financial decision and maximise your return when it's time to sell.
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Storing your car
The average lifespan of a car is considered to be 5-8 years, depending on the number of kilometres travelled and the expected residual value at the end of its effective life. The more you use your vehicle, the shorter its effective life will be, and the faster you can depreciate it. This is because depreciation is generally caused by wear and tear from daily driving, which impacts how well your car functions over time.
To slow down the depreciation process, it is advisable to limit mileage by minimising non-essential trips. This is because high mileage is often associated with more wear and tear, which can lead to significant decreases in value. Additionally, regular maintenance and servicing can help to keep your car in good condition, reducing wear and tear on tyres, the body, the engine, and other mechanical parts.
It is also important to keep your car in good condition by performing prompt repairs and regular cleaning. A comprehensive service history indicates that the vehicle has been well-managed and is in optimal condition, making it more desirable to potential buyers. Conversely, neglecting minor issues and overlooking repairs can lead to faster depreciation due to increased repair costs.
When storing your car, it is crucial to protect it from harsh weather conditions, as up-to-date car models can depreciate faster if they sustain damage that is costly to repair. For example, damage to tyres, the engine, or other mechanical parts can be expensive to fix and may not always be covered by insurance. By storing your car in a safe and protected location, you can help maintain its value over time.
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Using the cents per kilometre method
The cents per kilometre method is one of the two ways to claim depreciation on your motor vehicle in Australia, the other being the logbook method. This method is based on the total business kilometres travelled by the vehicle. It is important to note that only the business component of the vehicle's usage may be used as a tax deduction.
The Australian Taxation Office (ATO) specifies that this method can only be used by sole traders or partnerships where at least one partner is an individual. The rate for the 2025/2026 financial year is 88 cents for a maximum of 5,000 kilometres. This rate includes fuel, maintenance and the decline in value of the vehicle, so you don’t need to calculate the motor vehicle depreciation separately.
To calculate the amount you can claim, multiply the total business kilometres travelled by the rate. For example, if you travelled 5,000 kilometres for business purposes, you can claim 5,000 x 0.88 = 4,400.
It is important to keep records of all your expenses, such as fuel and maintenance, and also calculate your motor vehicle depreciation rate. The ATO has imposed a car limit which is the maximum amount that can be used as a tax deduction and depreciation. For the 2025/26 financial year, this limit is $69,674.
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Frequently asked questions
Car depreciation is the decrease in a car's value over time due to wear and tear, market demands, the age of the car, and its mileage.
You can calculate car depreciation by subtracting the car's current market value from its original price. This can be expressed as a formula: (New Car Price - Current Value) x (Difference / New Car Price) x 100. Alternatively, you can use the straight-line depreciation method, which allows you to claim a fixed amount each year.
Several factors influence car depreciation, including the car's brand, model popularity, consumer trends, technology, and economics, fuel efficiency, transmission type, and aftermarket modifications. Additionally, the price of a car can impact its depreciation rate, with newer and higher-priced models often depreciating faster.
There are two methods recognised by the Australian Taxation Office (ATO): the cents per kilometre method and the logbook method. The cents per kilometre method includes fuel, maintenance, and the decline in value, while the logbook method requires you to calculate your motor vehicle depreciation rate separately. The ATO also provides a depreciation and capital allowances tool to help with calculations.

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