The first time I compared car insurance in Australia, I made the mistake of looking at one number: the annual premium.

One policy was noticeably cheaper, so it seemed like the obvious choice.

Then I started looking at what would actually happen after an accident.

If I caused damage to another car, would I be covered? What if my own car was written off? What if it was stolen? What if a hailstorm damaged it while it was sitting outside?

That’s when the difference between comprehensive car insurance and third party insurance became much clearer.

The cheapest policy isn’t necessarily the best value. But that doesn’t mean everyone needs comprehensive insurance either.

For some Australian drivers, third party cover can make perfect financial sense. For others, paying more for comprehensive protection could save a major headache later.

Here’s how I would compare the two.

First: Don’t Confuse CTP With Third Party Property Insurance

This is probably the most important thing to understand.

In Australia, Compulsory Third Party (CTP) insurance is mandatory for registered vehicles. CTP generally covers compensation relating to injuries caused by a vehicle, but it doesn’t cover damage to your car or other people’s cars and property.

Third party property insurance is different.

It generally covers damage your vehicle causes to someone else’s car or property.

So you can think about the basic options like this:

Insurance	Your injuries	Other people’s injuries	Your car	Other people’s car/property
CTP	Depends on state scheme	Yes	No	No
Third party property	No	CTP generally applies	No	Yes
Third party fire & theft	No	CTP generally applies	Fire/theft	Yes
Comprehensive	No	CTP generally applies	Yes, subject to policy	Yes

The exact operation of CTP varies by state and territory, so don’t treat it as a replacement for property-damage insurance.

What Is Comprehensive Car Insurance?

Comprehensive insurance is generally the broadest type of optional car insurance available to Australian drivers.

It can cover damage to:

Your vehicle
Other people’s vehicles
Other people’s property

It can also cover your own vehicle for situations such as theft, fire and certain weather or natural-disaster events, depending on the policy.

For example, imagine you’re driving home during a heavy storm and hail damages your car.

With suitable comprehensive cover, the damage may be covered.

With basic third party property insurance, you’d generally be responsible for repairing your own vehicle.

That’s the biggest difference.

Comprehensive insurance protects your car as well as your liability to other people’s property.

What Does Third Party Car Insurance Cover?

Third party property insurance is much more focused.

If you cause an accident and damage another person’s vehicle, the policy can cover eligible damage to their vehicle or property.

But it normally doesn’t pay to repair your own car.

Let’s say you accidentally reverse into a brand-new $80,000 SUV.

Your own car has a damaged bumper.

The other vehicle has major damage.

With appropriate third party property cover, the insurer may cover the eligible damage you caused to the other vehicle.

But your own repair bill could still be yours.

That’s the trade-off.

And it’s a trade-off some drivers are completely comfortable with.

Third Party Fire and Theft: The Middle Option

There’s another option that often gets overlooked.

Third party property damage, fire and theft generally provides third party property protection while adding cover for your own vehicle if it’s stolen or damaged by fire.

It sits between basic third party property and comprehensive insurance.

This can be interesting if:

Your car isn’t worth enough to justify comprehensive premiums
You still worry about theft
You live somewhere with a higher theft risk
You want protection from fire
You can afford to repair accidental damage yourself

It’s not suitable for everyone, but it’s worth getting a quote before automatically choosing basic third party.

Comprehensive vs Third Party: The Real Difference

Here’s the easiest way I think about it.

Comprehensive

“I want protection for my car as well as other people’s property.”

Third party property

“I can handle losing my own car, but I don’t want one accident to leave me responsible for someone else’s expensive vehicle.”

Neither statement is wrong.

The right choice depends heavily on your financial situation.

Which Is Better Value?

This is where things get interesting.

People often ask:

“Which one is cheaper?”

That’s easy.

Third party is generally cheaper.

The better question is:

“Which one gives me the best value for my situation?”

That’s much harder.

Suppose your comprehensive premium is $1,800 per year.

Your third party policy costs $700.

The difference is:

$1,100 per year.

Over five years, assuming the premiums remained exactly the same, that’s $5,500.

If you have an older car worth around $6,000, you might reasonably question whether paying a large comprehensive premium makes financial sense.

But now imagine you have a $45,000 car.

The calculation changes completely.

Losing the vehicle could create a huge financial problem.

That’s when comprehensive insurance can become much easier to justify.

Consider the Value of Your Car

This is probably the first question I’d ask.

How much would I realistically lose if my car was written off tomorrow?

Don’t just look at the original purchase price.

Look at the vehicle’s current market value.

Imagine:

Car A: worth approximately $5,000

Car B: worth approximately $25,000

Car C: worth approximately $55,000

The financial consequences of losing each vehicle are completely different.

A driver with a $5,000 car and plenty of savings might be comfortable choosing third party cover.

Someone with a $55,000 vehicle may find that replacing it would be extremely difficult.

That doesn’t mean comprehensive is automatically correct for the second driver, but it’s an important consideration.

What If You Still Owe Money on the Car?

This changes the calculation significantly.

Imagine you financed a car for $40,000.

After a couple of years, you still owe $28,000.

Then the vehicle is written off.

If your insurance doesn’t cover damage to your own vehicle, you could potentially be left dealing with the loan while also needing another vehicle.

The exact financial outcome depends on the loan and insurance arrangements, but the basic problem is easy to understand:

Your debt doesn’t automatically disappear because the car is damaged.

If you’re financing a relatively expensive vehicle, comprehensive insurance may therefore deserve serious consideration.

Agreed Value vs Market Value

If you’re considering comprehensive insurance, another detail worth checking is how the insurer values your vehicle after a total loss.

Some policies use market value.

Others may offer agreed value, where a specified amount is agreed between you and the insurer.

MoneySmart notes that comprehensive insurance can offer a choice between agreed and market value depending on the policy.

This can make a meaningful difference after a write-off.

Don’t assume the amount you paid for the car is automatically the amount you’ll receive.

Check the policy.

The Cost of Comprehensive Insurance in Australia

There isn’t one standard Australian price.

Your premium can be affected by things such as:

Age
Driving history
Location
Vehicle model
Vehicle value
Annual kilometres
Where the car is parked
Driver history
Claims history
Selected excess
Policy features

Location can make a particularly noticeable difference.

CHOICE’s July 2026 analysis of thousands of market-representative comprehensive quotes found substantial differences between Australian states and territories. Its average quoted premiums ranged from around $1,389 in Tasmania to $2,420 in Victoria.

These are market averages, not personal quotes.

Your actual price could be considerably higher or lower.

Why Insurance Prices Have Become More Important to Compare

Car insurance isn’t something I’d renew automatically without checking the market.

MoneySmart reported that motor vehicle insurance premiums increased by 8% over the 12 months to July 2025, and noted that many consumers were receiving higher renewal prices.

That means your renewal notice deserves attention.

If you’ve been with the same insurer for several years, don’t assume loyalty automatically means you’re getting the best price.

Get some comparison quotes.

How to Compare Comprehensive Policies Properly

This is where I think many people go wrong.

They compare:

Insurer A — $1,500

against

Insurer B — $1,900

and immediately choose A.

Instead, compare the actual policy features.

Check the Excess

The excess is the amount you may need to pay when making a claim.

A cheaper premium can sometimes come with a higher excess.

For example:

Policy A

Premium: $1,400

Excess: $1,500

Policy B

Premium: $1,600

Excess: $750

The $200 annual saving on A isn’t automatically a bargain.

If you need to make a claim, the difference in excess could matter much more.

Check How Your Car Is Valued

Look for:

Market value

Agreed value

Understand what happens if the car is declared a total loss.

This is one of the sections I’d read before purchasing rather than after an accident.

Check Windscreen Cover

Windscreen damage is one of those things that’s easy to ignore until it happens.

Some comprehensive policies include windscreen-related benefits or optional cover.

Check:

Excess
Number of claims
Whether a special windscreen excess applies
Whether repairs are handled differently from replacement

The details vary between insurers.

Check Rental Car Benefits

If your car is your main way of getting to work, being without it can be a bigger problem than the repair bill itself.

Some comprehensive policies offer rental-car benefits in certain circumstances.

But don’t assume a rental car is automatically included.

Check when the benefit applies and how long the replacement vehicle is provided.

Check Roadside Assistance

Roadside assistance can be useful, but don’t pay for it twice.

You might already have roadside assistance through:

Your motoring organisation
Vehicle manufacturer
Dealer package
Another insurance policy

Before adding it to your car insurance, check what you already have.

Natural Disaster Cover Matters in Australia

Australia has a wide range of weather and environmental risks.

Depending on where you live, you may be concerned about:

Flood
Hail
Storm
Bushfire
Falling trees
Other severe weather

Comprehensive policies can cover various weather-related damage, but don’t assume every event is covered in exactly the same way.

Read the Product Disclosure Statement (PDS).

This is particularly important if you live in an area where a particular natural disaster is more common.

Third Party Can Make Sense for Older Cars

Here’s a situation where I wouldn’t automatically recommend comprehensive insurance.

Imagine you own an older car worth $4,500.

Your comprehensive premium is $1,700 a year.

Third party property insurance costs $600.

You have enough savings to replace the vehicle if necessary.

In that situation, paying $1,100 extra every year for comprehensive cover may not provide enough value for you.

You might decide:

“I’ll protect myself against the really expensive liability risk and accept the risk of losing my own vehicle.”

That’s a perfectly understandable insurance strategy.

But it only works if you can actually afford that risk.

When Comprehensive Insurance Is Easier to Justify

I’d lean toward seriously considering comprehensive insurance if:

Your car is relatively new
Your car has a high replacement cost
You’re still financing the vehicle
You rely heavily on the vehicle
You couldn’t easily replace it
You live somewhere with significant theft or weather risks
You want protection from accidental damage
You prefer predictable financial protection

Again, this isn’t a universal rule.

It’s about your ability to absorb the loss.

When Third Party May Be the Better Choice

Third party property insurance may make more sense if:

Your car has a low market value
You have enough savings to replace it
Comprehensive premiums are disproportionately high
You don’t mind accepting the risk of damage to your own vehicle
Your main concern is damaging another person’s expensive car

One thing I wouldn’t do is choose third party purely because you’re trying to save money this month.

Ask yourself whether you’d still be comfortable with the decision if the car was written off next week.

That’s a much better test.

A Simple Example

Let’s say Sarah owns a 10-year-old car worth approximately $7,000.

Her annual quotes are:

Comprehensive: $1,600

Third party fire & theft: $850

Third party property: $620

She has $15,000 in savings.

If Sarah chooses third party property and her car is written off in an at-fault accident, she could potentially replace it using her savings.

That’s a risk she may be comfortable accepting.

Now change the situation.

David owns a two-year-old car worth $38,000 and has only $3,000 in savings.

His comprehensive quote is $1,900.

His third party quote is $700.

The $1,200 saving sounds attractive.

But losing a $38,000 vehicle would be financially painful.

For David, comprehensive cover may provide considerably more value despite the higher premium.

Don’t Forget the Other Driver’s Car

This is the part I think people sometimes underestimate.

You might think:

“My car is only worth $5,000, so I don’t need much insurance.”

But the car you hit might be worth $80,000.

Or you could damage a fence, building, shopfront or other property.

MoneySmart specifically points out that damage to another person’s car or property can become expensive.

That’s why even someone driving an old car can have a strong reason to maintain third party property insurance.

How to Get Better Insurance Rates

You don’t necessarily need to downgrade your cover to save money.

Try these steps first.

Compare Multiple Insurers

Get several quotes using exactly the same information.

Don’t compare a comprehensive policy from one insurer with a stripped-down third party policy from another.

Adjust the Excess Carefully

Ask how changing your excess affects the premium.

Only choose an excess you could comfortably afford.

Check Your Annual Kilometres

If you drive fewer kilometres than you did previously, make sure your insurer has accurate information.

Don’t deliberately underestimate your driving just to obtain a cheaper quote.

Review Optional Extras

Remove extras you don’t need—but understand what you’re removing.

Recheck at Renewal

Don’t simply accept the renewal price.

Shop around.

MoneySmart recommends comparing policies because premiums, exclusions, conditions and discounts can differ between insurers.

Which Australian Insurers Should You Compare?

There isn’t one insurer that’s cheapest for every driver.

CHOICE’s 2026 analysis found significant differences in pricing across insurers and states, which is another reason not to assume that one company will always offer the best deal.

Depending on where you live, insurers you might encounter include:

AAMI
Allianz
Budget Direct
GIO
NRMA Insurance
RAC
RACQ
RACV
RAA
Suncorp
Youi

The right shortlist depends on your location and circumstances.

Interestingly, CHOICE’s 2025 customer survey found substantial differences in satisfaction between insurers, with RAA, RACQ and Youi among the stronger performers in its survey.

Customer satisfaction isn’t the same as price or policy quality, but it is another factor worth considering.

Don’t Judge an Insurer Only by the Advertised Discount

An online discount can make a quote look fantastic.

But check what happens after the first year.

Some discounts apply only to the initial policy period.

For example, CHOICE notes that some insurers offer first-year discounts rather than an equivalent discount at renewal.

That’s why I’d compare the actual renewal pricing as well as the introductory offer when possible.

What About Uninsured Drivers?

This is another reason third party property insurance can be valuable.

Imagine you’re involved in an accident with an uninsured driver.

The exact process depends on the circumstances and your policy, but some insurance products provide limited protection in certain uninsured-driver situations.

Don’t assume you’re automatically protected.

Check the policy wording for any uninsured-driver benefit, limits and conditions.

Common Mistakes to Avoid

Mistake 1: Thinking CTP Covers Car Damage

It doesn’t generally cover damage to vehicles or property.

Mistake 2: Choosing Comprehensive Without Checking the Excess

A high excess can make a low premium less attractive.

Mistake 3: Choosing Third Party Without Considering Replacement Cost

Ask yourself how you’d pay for another car if yours was written off tomorrow.

Mistake 4: Assuming All Comprehensive Policies Are Identical

They aren’t.

Coverage limits, exclusions, valuation methods and optional benefits can differ.

Mistake 5: Ignoring Your Car Loan

If you still owe money on the vehicle, understand what happens if it’s written off.

Mistake 6: Automatically Renewing

Prices change.

Get fresh quotes.

Mistake 7: Lying About Your Driving Details

Don’t reduce your kilometres, hide drivers or provide inaccurate information just to get a cheaper premium.

Insurance is based on the information you provide.

A Quick Decision Checklist

Before choosing your policy, ask yourself these seven questions:

1. What is my car worth today?

2. Could I afford to replace it tomorrow?

3. How much do I still owe on it?

4. How much would an accident involving another vehicle potentially cost?

5. How much is the comprehensive premium?

6. What is the excess?

7. What exactly does the policy exclude?

If you answer those honestly, the decision usually becomes much clearer.

Comprehensive vs Third Party: My Take

If I owned an inexpensive older vehicle and had enough savings to replace it, I’d be comfortable considering third party property or third party fire and theft.

I’d rather keep the annual premium under control while protecting myself against the potentially huge cost of damaging someone else’s property.

But if I owned a newer, expensive vehicle—or one that I couldn’t afford to replace—I’d look much more seriously at comprehensive insurance.

The extra premium is essentially paying to transfer more of that financial risk to the insurer.

That’s what insurance is really about.

Not finding the policy with the smallest number on the screen.

Final Thoughts

There isn’t a universal winner between comprehensive and third party car insurance in Australia.

Comprehensive insurance generally gives you much broader protection, including cover for damage to your own vehicle from eligible insured events as well as damage you cause to other people’s property.

Third party property insurance is cheaper and can be a sensible choice when you’re comfortable accepting the risk of paying for damage to your own car.

The key question isn’t:

“Which insurance is cheapest?”

It’s:

“If something goes badly wrong tomorrow, which financial risk can I realistically afford to take?”

Once you answer that, comparing policies becomes much easier.

And whatever type you choose, don’t forget the basics: check the excess, read the PDS, understand how your vehicle is valued, compare multiple quotes and review your insurance at renewal.

A few minutes spent comparing policies can be far more valuable than simply accepting the first renewal price that lands in your inbox.