How Do Security Devices Reduce Car Insurance?
In a Nutshell: Installing approved security devices on your car can reduce your insurance premium by 5–15%. Insurers recognise factory and aftermarket immobilisers, alarms, GPS tracking devices, and steering locks. The most effective discount comes from a combination of devices — especially if your car is high-risk (popular with thieves).
Security Devices and Typical Discounts
| Device | Typical Discount | How It Works |
|---|---|---|
| Factory immobiliser | 5–10% | Standard on most modern cars — confirms your car is harder to steal |
| Aftermarket immobiliser | 5–10% | Approved devices (e.g., Mongoose, Viper) — reduces theft risk |
| Car alarm | 3–8% | Audible alarm — deters opportunistic theft |
| GPS / Satellite tracking | 5–15% | Recovery device — helps police find stolen cars |
| Steering wheel lock | 2–5% | Visual deterrent (Club Lock) |
| Wheel clamp | 2–5% | Visible deterrent |
| VIN etching | 2–5% | Etching VIN on windows and parts — makes resale harder |
| Engine immobiliser | 5–10% | Prevents engine starting without the correct key |
| Kill switch | 5–10% | Manual switch that disables the fuel pump or ignition |
| Immobilising relay | 3–8% | Prevents CAN-bus attacks (important for modern keyless cars) |
ℹ️ Factory devices: Most cars built after 2005 have factory immobilisers. Insurers typically include this in their standard risk assessment — you won't get an extra discount for it, but a car without an immobiliser will have a HIGHER premium.
Devices by Theft Reduction Effectiveness
| Device | Theft Reduction | Save on Premium |
|---|---|---|
| GPS tracker (recovery) | 70%+ recovery rate | Up to 15% |
| Immobiliser | 90%+ theft prevention | Up to 10% |
| Engine immobiliser + alarm | 95%+ theft prevention | 8–12% |
| Visual deterrent (club lock) | 40–60% deterrent | 2–5% |
| VIN etching | Reduces resale value of stolen parts | 2–5% |
Which Insurers Offer Security Discounts?
| Insurer | Recognises Security Devices? | Typical Discount |
|---|---|---|
| NRMA | ✅ Yes | Up to 10% for alarm/immobiliser |
| AAMI | ✅ Yes | Up to 10% for approved devices |
| Budget Direct | ✅ Yes | Up to 10% for immobiliser |
| Allianz | ✅ Yes | Up to 10% for multiple devices |
| Youi | ✅ Yes | Customisable — based on security features you choose |
| GIO | ✅ Yes | Up to 10% for approved devices |
| Bingle | ⚠️ Limited — standard assessment | Minimal discount |
| Shannon's | ✅ Yes | Up to 15% for enthusiast-grade security |
| Club 4X4 | ✅ Yes | Up to 10% for off-road focused security |
Keyless Car Security (2026 Update)
| Security Issue | Risk | Solution |
|---|---|---|
| Relay attack | Thieves amplify your key fob's signal from inside your home | Faraday pouch/bag or signal-blocking key box |
| CAN-bus attack | Thieves access your car's network through the headlight wiring | OBD lock or immobiliser relay |
| Key cloning | Thieves copy the signal from your key fob | Signal-disabling fob case |
✅ Some insurers now offer specific discounts for keyless car security measures (e.g., Faraday pouch for keyless entry cars).
How to Claim Your Security Device Discount
| Step | Action |
|---|---|
| 1 | Check what devices your car already has (factory alarm/immobiliser) |
| 2 | Get an approved aftermarket device if your car lacks features |
| 3 | Keep the receipt and installation certificate |
| 4 | Tell your insurer when getting a quote — "I have an immobiliser, alarm, and steering lock" |
| 5 | Ask specifically: "Is there a discount for security devices?" |
| 6 | If the discount isn't automatically applied, request a re-quote with devices declared |
The Thumb Rule: Do Install If...
| Your Situation | Should You Install a Device? |
|---|---|
| Your car has no immobiliser | ✅ Definitely — will reduce premium AND prevent theft |
| Your car has factory alarm+immobiliser | ⚠️ Additional discount is small — only install if you want the security |
| Your car is frequently stolen (HiLux, Ranger) | ✅ Yes — GPS tracker pays for itself |
| You park on the street | ✅ Yes — increased theft risk |
| You have a classic/modified car | ✅ Yes — these are more desirable to thieves |
| Your premium is already low | ⚠️ Limited benefit — discount may be minimal |
Key Takeaway
- Security devices can reduce your premium by 5–15%.
- Most effective: GPS tracker (up to 15%), immobiliser (up to 10%).
- Factory immobilisers are standard on most modern cars — they don't earn an extra discount but the absence does increase premium.
- Keyless cars are at higher theft risk — Faraday pouches and OBD locks earn discounts.
- Always declare your security devices when getting a quote — don't assume the insurer knows.
- Keep receipts and installation certificates for ALL devices.
- The best protection: multiple layers (immobiliser + alarm + tracking + visual deterrent).
Last updated: July 2026
Disclaimer: This article provides general information about security device discounts in Australian car insurance. Specific discounts, approved devices, and terms vary by insurer. Check with your insurer for their approved devices list.