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GST and stamp duty on car insurance: reading your premium line by line
How an Australian car insurance premium is made up of base premium, GST and state stamp duty, with worked examples by state and what it means when you compare quotes.
An Australian car insurance premium has three main parts: the base premium the insurer charges for the risk, GST at 10%, and state or territory stamp duty on insurance, which ranges from 5% (NSW, where motor vehicle insurance has its own lower rate) to 11% (SA) depending on where the car is garaged (the ACT no longer charges it). Your certificate of insurance or policy schedule usually shows each part separately. Because tax is charged as a percentage of the premium, a lower base premium also lowers the tax, and quotes from different insurers in the same state carry the same tax rates, so the comparison that matters is the total amount payable.
This guide belongs to the Australian car insurance overview. For the risk factors behind the base premium, see what affects car insurance premiums.
The parts of a premium
| Line on your schedule | What it is | Who sets it |
|---|---|---|
| Base premium | The insurer's price for the risk, expenses and profit | The insurer |
| GST | Goods and services tax at 10% | Commonwealth |
| Stamp duty | Duty on general insurance premiums | Your state or territory |
| Instalment loading or fees | Extra charged for paying monthly, or administration fees | The insurer |
| Total payable | What you actually pay over the period | Sum of the above |
Some insurers also show discounts as a separate line, applied to the base premium before taxes.
Stamp duty rates on car insurance by jurisdiction
The rates below are the duty rates applied to private motor vehicle policies in each jurisdiction. They are set by each state's duties law and can change in a state budget, so check your state revenue office before relying on them.
| Jurisdiction | Duty rate on private motor vehicle insurance |
|---|---|
| NSW | 5% (motor vehicle insurance is "Type B"; most other general insurance is 9%) |
| Victoria | 10% |
| Queensland | 9% |
| South Australia | 11% |
| Western Australia | 10% |
| Tasmania | 10% |
| Northern Territory | 10% |
| ACT | No duty on general insurance premiums (abolished in stages) |
CTP premiums have their own treatment under each scheme; where CTP is collected with rego, the CTP amount on the rego notice already reflects any charges and levies the scheme applies.
Worked examples (illustrative)
The duty is commonly calculated on the premium including GST, which is how these examples work. Check your own schedule to see the order your insurer uses.
Same base premium, different states
Base premium $1,000:
| NSW (5%) | SA (11%) | ACT (nil) | |
|---|---|---|---|
| Base premium | $1,000.00 | $1,000.00 | $1,000.00 |
| GST 10% | $100.00 | $100.00 | $100.00 |
| Subtotal | $1,100.00 | $1,100.00 | $1,100.00 |
| Stamp duty | $55.00 | $121.00 | $0.00 |
| Total payable | $1,155.00 | $1,221.00 | $1,100.00 |
The total tax share is about 13.4% of the total in NSW ($155 / $1,155), 18.1% in SA ($221 / $1,221) and 9.1% in the ACT ($100 / $1,100).
Working backwards from a quote
Comparison results usually show the total. To estimate the base premium in a state with 10% duty, divide the total by 1.1 (GST) and then by 1.1 again (duty): a $1,331 total gives $1,331 / 1.21 = $1,100 base premium, $110 GST and $121 duty. In NSW, divide by 1.1 x 1.05 = 1.155.
What a discount is really worth
A 15% online discount on a $1,000 base premium saves $150 before tax. In NSW, the total falls from $1,155 to $981.75, so the saving in your pocket is $173.25, because GST and duty fall too. That is why a discount shown on the base premium understates the real saving slightly.
Why the tax matters when comparing
- Compare totals, not base premiums. One insurer's online page may show a price before fees; another shows the total. Always compare the total payable for 12 months.
- The garaging state decides the duty. If you move interstate, your premium changes partly because of tax, not only risk.
- Mid-term changes recalculate tax. An extra premium for adding a driver also attracts GST and duty; a refund on cancellation usually includes the tax portion.
Business use and GST credits
If the car is used in a business registered for GST, the business may be able to claim a GST credit for the business use portion of the premium. That is a tax question for your accountant or the Australian Taxation Office; this site deals with private car insurance.
Mistakes to avoid
- Treating the base premium on one quote as comparable with the total on another.
- Assuming the ACT price will apply if the car is actually garaged in NSW.
- Forgetting that monthly instalments may add a loading on top of the taxed premium. See paying monthly or annually.
- Not checking the schedule after a mid-term change, when extra premium and tax are added.
To compare quotes on their totals against a claim, use the quote comparison tool.
Frequently asked questions
Can I avoid stamp duty on car insurance?
Not legally while the car is garaged in a state that charges it. Duty is collected by the insurer and paid to the state.
Is GST charged on CTP?
The treatment of CTP charges depends on the scheme. Your rego or Green Slip notice shows the amount payable, and the state's CTP body can explain what it includes.
Do I get the stamp duty back if I cancel?
Refunds on cancellation are usually calculated on the unused period and normally include the corresponding tax, less any cancellation fee. Check the PDS.
Why does my schedule show a different total from the online quote?
Differences usually come from changed details, a fee, or an instalment loading. Ask the insurer to explain each line.
Sources
- Australian Taxation Office — GST on insurance and business credits
- Revenue NSW — NSW duty on insurance
- State Revenue Office Victoria — Victorian duty on insurance
- Queensland Revenue Office — Queensland insurance duty
- Moneysmart — comparing car insurance quotes
