How Does Listing a Second Driver Affect Car Insurance?
In a Nutshell: Adding a second driver to your policy can increase OR decrease your premium — depending on who that driver is. Adding an experienced, safe driver (like a parent or spouse) can actually lower your premium. Adding a young or high-risk driver will increase it significantly.
The Second Driver Effect
| Second Driver Profile | Effect on Premium |
|---|---|
| Experienced driver (40+, clean record) | ✅ Can reduce premium by 5–15% |
| Spouse/partner (similar age and experience) | ✅ Minimal to no increase (often £0) |
| Young driver (under 25) | ❌ Increase of 20–80% |
| High-risk driver (claims, demerits) | ❌ Increase of 30–100%+ |
| Learner driver | ⚠️ Minimal increase (if added as learner) |
Why Adding a Second Driver Affects Your Premium
Insurers assess the highest-risk driver on the policy:
| Scenario | Who the Insurer "Sees" | Premium Based On |
|---|---|---|
| You only (35, clean record) | You only | Your risk profile |
| You + your 18-year-old son | The youngest driver (18) | The 18-year-old's risk profile |
| You + your 50-year-old spouse | You and spouse (similar age) | Combined — no premium change |
| You + your 25-year-old sibling | Both drivers blended | Higher than just you |
💡 Key rule: If you add a driver with a worse risk profile than you, the premium likely increases. If you add a driver with a better risk profile, it can decrease.
Premium Changes — Real Examples
| Policy Holder | Second Driver | Premium (Single) | Premium (Both) | Change |
|---|---|---|---|---|
| 45-year-old female | 47-year-old male (clean record) | $850 | $830 | –2% (saving) |
| 55-year-old male | 52-year-old female (clean) | $780 | $750 | –4% (saving) |
| 35-year-old male | 32-year-old female (clean) | $950 | $950 | 0% (no change) |
| 45-year-old male | 18-year-old son (P-plate) | $800 | $1,450 | +81% (major increase) |
| 50-year-old female | 19-year-old daughter (P-plate) | $750 | $1,200 | +60% (major increase) |
| 30-year-old male | 28-year-old male (2 at-fault claims) | $1,000 | $1,400 | +40% (increase) |
When Adding a Second Driver Saves You Money
| Situation | How It Saves |
|---|---|
| Young driver added to parent's policy | The parent's policy with 50–60% NCB is much cheaper than the young driver's own policy |
| Parent added to young driver's policy | Adding an experienced driver as the primary named driver reduces the young driver's premium |
| Partner with clean record | Insurers see two experienced drivers — lower risk overall |
| Spouse with defensive driving course | Some courses qualify both drivers for discounts |
Young Drivers: Named Driver vs Own Policy
| Option | Annual Cost (car value $15,000) | Notes |
|---|---|---|
| Young driver's own policy (19yo) | $2,400–$3,400 | Most expensive |
| Added to parent's policy as named driver (19yo) | $1,200–$1,800 | 30–50% cheaper |
| Parent + young driver — both as named drivers | $1,400–$2,000 | Still cheaper than solo |
💡 Saving for young drivers: Being a named driver on a parent's policy is THE cheapest way to get insured — often saving 30–50%.
Does the Second Driver Build Their Own NCB?
| Insurer | Does Named Driver Build NCB? |
|---|---|
| AAMI | ✅ Yes (on some policies — check) |
| NRMA | ✅ Yes (3+ years as named driver) |
| Allianz | ⚠️ Check policy — varies |
| Budget Direct | ⚠️ Sometimes — depends on policy structure |
| Youi | ⚠️ Case-by-case — call to check |
💡 Tip: If NCB building is important, ask before you buy. Some policies only give NCB to the policy owner, not named drivers.
Key Takeaway
- Adding a second driver can increase or decrease your premium — it depends on the driver's profile.
- Adding an experienced, safe driver can lower your premium by 5–15%.
- Adding a young driver (under 25) increases the premium by 20–80%.
- Young drivers should be named drivers on a parent's policy for the best rate.
- Adding a learner driver has minimal premium impact.
- The insurer focuses on the highest-risk driver on the policy.
- Check whether named drivers can build their own no-claim bonus.
Last updated: July 2026
Disclaimer: This article provides general information about how listing a second driver affects car insurance in Australia. Premium impacts vary by insurer and individual circumstances. Always get a quote before adding a driver.