Why Monthly Costs More
Insurers charge an instalment surcharge — typically in the 10-20% range — to cover the administrative cost and default risk of collecting smaller, more frequent payments instead of one lump sum. On a $1,362 average comprehensive premium, a 15% surcharge adds roughly $200 a year compared to paying annually.
When Monthly Makes Sense Anyway
- You'd otherwise need to use a credit card or loan to cover the annual lump sum, which likely costs more in interest than the surcharge
- Smoothing a large expense across the year genuinely helps your budgeting, even at a small premium
- You're not confident you'd have the full annual amount available at renewal time
How to Minimise the Cost
Some insurers charge a smaller surcharge than others — it's worth asking directly what the monthly vs. annual price difference actually is in dollars before assuming it's the same everywhere. If you can build up savings to pay annually even one year, switching saves that surcharge permanently going forward.
What Happens If You Miss a Monthly Payment
Missing an instalment can lapse your cover entirely, sometimes with only a short grace period — leaving you unknowingly uninsured. If you choose monthly payments, set up autopay and keep a buffer in the linked account to avoid this risk.
This page is for educational purposes and isn't personalised financial advice. Premiums, terms and eligibility vary by insurer, state and individual circumstances — always check the Product Disclosure Statement (PDS) before buying.