What Is SEF 27 Legal Liability for Non-Owned Automobiles?
In a Nutshell: SEF 27 provides liability coverage when you drive a vehicle you don't own — a borrowed car from a friend, a rental car, or a courtesy loaner from a dealership. Without this endorsement, you may have limited or no coverage in these situations.
What SEF 27 Covers
SEF 27 ensures you have liability protection when operating a vehicle that isn't yours:
| Scenario | Coverage Gap Without SEF 27 | With SEF 27 |
|---|---|---|
| You borrow a friend's car | Your policy may not extend liability | ✅ Covered for third party liability |
| You rent a car from Enterprise | Credit card or rental insurance may be primary | ✅ You have your own liability coverage |
| Dealership loaner while yours is serviced | Dealership's policy is limited | ✅ You're covered for liability |
| You crash a car you're test driving | Dealership's policy has limits | ✅ Your SEF 27 provides excess coverage |
| Employer's vehicle used for personal errands | Employer's policy covers business use only | ✅ Personal liability covered |
How SEF 27 Works with Other Policies
Understanding which policy is "primary" is crucial:
| Vehicle Owner's Policy | SEF 27 (Your Policy) | Outcome |
|---|---|---|
| Primary — responds first | Excess — only after owner's limits exhausted | Owner's policy pays first; yours covers what's left |
| Excess — limited coverage | Primary — if owner's policy is insufficient | Your SEF 27 fills the gap |
| Denied — exclusions | Primary — your policy takes over | Your coverage acts as primary |
Example: You borrow your neighbour's car and cause $300,000 in damages. Their policy has $200,000 liability limit. SEF 27 covers the remaining $100,000 (if you have $200,000+ liability).
Who Needs SEF 27?
| Driver Profile | Need for SEF 27 |
|---|---|
| Borrow cars from friends/family occasionally | ✅ Highly recommended |
| Rent cars 1–2 times per year | ✅ Recommended |
| Rent cars frequently for business | ✅ Essential |
| Test drive vehicles at dealerships | ✅ Recommended |
| Use car-sharing services (Communauto, Zipcar) | ⚠️ Check if car-sharing provides liability |
| Receive dealership loaners during service | ✅ Recommended |
| Never drive any vehicle except your own | ❌ Not needed |
SEF 27 vs. SEF 24
These two endorsements are often confused:
| Factor | SEF 27 | SEF 24 |
|---|---|---|
| What it covers | Liability when driving a non-owned vehicle | Damage to a non-owned vehicle |
| Example | You crash a friend's car — covers injury/property you cause to others | You crash a friend's car — covers damage to their car |
| Policy section | Third Party Liability | Loss or Damage |
| Who needs it | Everyone who borrows/rents vehicles | Everyone who borrows/rents vehicles |
| Both needed? | Often sold together as a package |
Typical SEF 27 Limits
| Coverage Option | Typical Annual Premium |
|---|---|
| Extension of your existing liability limit | $20 – $50 |
| Separate sub-limit ($200,000) | $15 – $30 |
| Separate sub-limit ($1,000,000) | $25 – $50 |
| SEF 24 + SEF 27 bundled | $40 – $80 |
What Happens Without SEF 27?
Without this endorsement:
- Your liability coverage may not extend to vehicles you don't own
- You rely entirely on the vehicle owner's insurance — if their limits are low, you're exposed
- Rental car damage is your responsibility — the rental company's loss damage waiver (LDW) costs extra daily
- Some insurers exclude non-owned vehicle liability entirely in their standard policies
SEF 27 vs. Credit Card Rental Insurance
| Factor | SEF 27 | Credit Card Coverage |
|---|---|---|
| Covers liability | ✅ Yes | ✅ Sometimes (limited) |
| Covers damage to rental | ✅ Yes (if combined with SEF 24) | ✅ Yes (usually) |
| Applies to borrowed cars | ✅ Yes | ❌ No |
| Applies in Canada | ✅ Yes | ✅ Yes |
| Applies in United States | ✅ Yes | ✅ Yes |
| Per-day cost | Pennies (annual premium) | $0 (included in card benefits) |
Key Takeaways
- SEF 27 provides liability coverage when driving a non-owned vehicle (borrowed, rental, loaner)
- Without it, you rely entirely on the vehicle owner's insurance — which may have low limits
- Works in excess of the owner's policy — fills coverage gaps
- Costs just $15–$50/year — extremely cheap for the protection it provides
- Often bundled with SEF 24 (damage to non-owned vehicles) as a package
- Essential for anyone who rents cars, borrows vehicles, or drives dealership loaners
- Not the same as credit card rental coverage — they complement each other
Last updated: July 2026
Disclaimer: This article provides general information about SEF 27 coverage in Canada. Availability, terms, and costs vary by insurer and province. Always review your policy documents and consult with a licensed insurance professional for advice specific to your situation.