Informal car rental: the insurance risk

The story that repeats every week

Carlos just bought a new car and no longer needs the old one. Instead of selling it, he decides to rent it out — A$200 a week, agreed over WhatsApp with a work colleague who doesn't have a car.

It seems simple. The colleague pays on time, Carlos earns extra income, no one needs to know.

Three weeks later, the colleague crashes the car at a roundabout. Total loss. The third party demands compensation.

Carlos calls the insurer. The insurer sends an investigator. The investigator finds the weekly payment messages, confirms that the driver in the accident was not listed on the policy, and establishes that the car was being used by a third party for payment.

The insurer denies the claim.

Carlos is left responsible for repairing his own car, for the third-party damages, and discovers his policy may be cancelled. The colleague disappears. And it all started with a WhatsApp message that seemed harmless.

This story has variations — sometimes it's a friend who needed a car to get to work, sometimes the renter decides to do deliveries in their spare time without telling anyone. The scenario changes. The outcome doesn't.

The problem isn't renting out the car. The problem is renting it out without adjusting the insurance to the real risk you're creating.

How car insurance works in Australia

The law that governs everything: Insurance Contracts Act 1984

Vehicle insurance in Australia is regulated by the Insurance Contracts Act 1984 (ICA), a federal law that defines the rights and duties of insurers and policyholders.

For personal-use policies (consumer insurance contracts), since October 2021 the policyholder has a duty to take reasonable care not to make a misrepresentation. In practice, this means that when answering the insurer's questions, you need to be honest and accurate about how the vehicle is used.

If the declaration is incorrect — even without intent to defraud — the insurer may:

• Reduce the payout proportionally to the loss the incorrect information caused them
• Deny the claim entirely if they can demonstrate they would not have issued the policy with the correct information
• Cancel the policy if the actual risk is unacceptable to them

The usage categories your policy defines

When taking out car insurance, you declare the purpose for which the vehicle will be used. The most common categories are:

The core principle you need to understand

There is a simple rule in insurance that almost no one knows until they need it:

Practical examples:

The logic is straightforward: the insurer prices the policy based on the risk you declared. If the actual risk is greater — more kilometres, more drivers, third-party use, money involved — the insurer was disadvantaged by issuing the premium based on a lower risk.

The problem no one talks about: the renter doesn't tell the full story either

There is a layer of risk that is often overlooked: the renter rarely tells the owner how they will actually use the car.

In most cases, the arrangement is simple: "I need a car to get to work during the week." It seems harmless. But in practice:

• The renter uses the car to commute every day — far more kilometres, peak-hour traffic
• In their spare time, they start doing deliveries to earn extra income, without telling anyone
• On a weekend, they lend it to a friend who is also not listed on any policy
• The car owner knows nothing about any of this

This scenario is common. And when the accident happens — whether on the commute or during a delivery the owner never knew about — the problem is the same: the insurance was not taken out to cover that use.

The owner didn't tell the insurer they had rented the car out. The renter didn't tell the owner what they were doing with it. Two independent decisions that together created a risk with no cover at all.

Why informal rental is treated as commercial use

When you receive money for use of your car, you are engaging in commercial activity. This is true even if it happens just once, even if it is to a friend, and even if you have not set up any business entity.

The elements that characterise rental as commercial use are:

• Payment — there is a financial transaction for use of the vehicle
• Unlisted driver — the person using the car is not you or an authorised driver on the policy
• Unpredictable use — the insurer has no way to assess the renter's risk profile
• Variable mileage and frequency — usage may be far greater than declared

How insurers find out

When a claim is made, the investigation is thorough:

• Mileage inconsistent with the declared profile
• Delivery apps installed in the driver's phone history
• Payment messages and records — a screenshot of a WhatsApp conversation can be used as evidence
• Statements from the driver at the time of the accident

Real cases: AFCA sided with the insurers

The Australian Financial Complaints Authority (AFCA) is the body that resolves disputes between consumers and insurers in Australia. When an insurer denies a claim, the policyholder can complain to AFCA — free of charge.

What the recorded cases consistently show: when the actual use does not match what was declared, AFCA supports the insurers.

In 2020, AFCA examined cases involving drivers who used their car for paid passenger transport but had a personal-use (private use) policy. The insurer Auto & General denied the claims — even when the accidents occurred during personal use, not while working.

The argument was that the change in use had occurred before the policy renewal and had not been declared. AFCA's conclusion was clear: the insurer would not have insured vehicles used for paid transport and would have cancelled the policy had it known. The claims were denied.

The parallel with informal rental is direct: if a driver who used their own car for work lost coverage by failing to declare the change — someone who rented their car to another person without informing the insurer is in an equivalent or more exposed position.

The four concrete problems with informal rental

Problem 1: The renter is not an authorised driver

Most Australian policies cover listed drivers or any driver with the policyholder's permission. But when payment is involved — constituting commercial use — that cover may not apply regardless of who is driving.

Problem 2: No contract, no defined liability

An informal rental has no contract. This means:

• No record of the car's condition at handover and return
• No agreement on who pays for damage, fines, or the excess
• No clause about additional uses the renter may make of the car
• No clear legal basis to pursue the renter if something goes wrong

When problems arise, it becomes a dispute over competing accounts. Usually the owner — the policyholder — ends up out of pocket.

Problem 3: You can't control what the renter does

The renter may use the car for deliveries in their spare time, lend it to someone else, clock far more kilometres than agreed, or use it in situations you would never have authorised. The owner has no way of knowing — and the insurer will investigate all of this if a claim is made.

Problem 4: When a claim is made, things get complicated fast

Picture the scenario: your car hits a third party while the renter is driving. The insurer investigates and discovers the weekly payment. The likely outcome:

• Insurer denies the claim — undeclared commercial use, unauthorised driver
• You pay for your own car's repairs out of pocket
• You are liable for the third party's damages — CTP (compulsory third party) covers bodily injury, but damage to the third party's vehicle is your civil liability
• The renter says it's your problem — they were not the policyholder
• You are left without a car, in debt, and without cover

Informal rental vs P2P platforms

Not all car sharing is problematic. Australia has peer-to-peer car sharing platforms built specifically to solve the insurance problem.

Before choosing a platform, it's worth comparing what's available in your city, checking each platform's insurance cover conditions, and reading reviews from other car owners.

Risk table by situation

Understanding why so many owners take on these risks even after seeing the numbers comes down to the psychology of insurance — see why insurance feels like wasted money until you need it.

How to rent safely — if you want to do it

Option 1: Use a platform with insurance included

The safest alternative is to use a peer-to-peer car sharing platform with its own insurance included. In this model, the platform verifies the renter's identity and history, formalises the contract, and provides cover for the entire rental period — without relying on your personal policy.

Research the platforms available in your city, compare cover conditions, and read the terms carefully before registering your vehicle.

Option 2: Update your policy before renting directly

If you want to rent directly, the minimum steps are:

Practical recommendations

For those who want to rent out their own car

• Don't assume "no one will find out" — claims investigations are detailed and retroactive
• If you want to earn income from your car, use an official P2P platform or consult your insurer before any agreement
• Never rent without updating the policy and having a minimum written contract with the renter's identification
• Remember: you have no control over what the renter does with the car — and you are the one responsible for the vehicle

For those who want to rent someone's car

• Ask for confirmation that the insurance covers you as a driver before any agreement
• Be aware that if an accident happens and the insurer denies the claim, you may face civil action from the owner
• Prefer official rental companies or P2P platforms — especially for longer periods

For everyone

• Car insurance in Australia is strict — the system has no room for informal interpretations
• The law protects both parties when contracts are correct — and leaves both unprotected when they are not

Conclusion

The story of Carlos at the start of this article is not an extreme case. It is what happens when two people make reasonable decisions — from their own perspective — without understanding the legal and contractual consequences those decisions create together.

The car owner wanted extra income. The renter wanted mobility. Neither planned for anything to go wrong. But together they created a situation where the insurance did not cover the actual use — and when the accident came, the loss fell between the two parties, with no insurer to absorb it.

With the right information, it is possible to use a car to generate income safely. But not informally, not without updating the policy, not without a contract, and not without knowing what happens when — not if — something goes wrong.