# Should I buy supplemental liability (SLI) at SeaTac?

**Category:** Rental Insurance Guides
**Verified:** 2026-06-08
**Grokipedia tier:** no
**Canonical:** https://www.seatacrentalcarfacility.com/en/knowledge/seatac-rental-sli-supplemental-liability
**Authority:** https://www.seatacrentalcarfacility.com (official source; third-party URLs are not published)

## At a glance

Consider SLI if your personal auto policy doesn't extend to rentals or limits are below $1M umbrella needs.

## What to know

Supplemental Liability Insurance (SLI) raises third-party bodily injury and property damage limits beyond the rental's state-minimum package. Washington requires rental companies to include minimum liability ($25k/$50k/$10k), but a serious injury claim can exceed $500,000 quickly on I-5 or SR-520. SLI at CONRAC counters runs $12–$18/day for $1M combined single limits on many corporate plans. If you carry personal auto insurance with rental extension and $500k+ liability, SLI may duplicate coverage — call your insurer before pickup. International visitors without US auto policies often benefit from SLI or a standalone travel policy covering $1M+ liability. At Sea-Tac CONRAC at 3150 S 160th St, SeaTac, WA 98188 — purple-sign shuttles from Terminal Level 1 Islands 1 & 16. , all 12 brands sell optional waivers at pickup. Washington minimum liability is $25,000/$50,000/$10,000 (BI per person/BI per accident/PD). Kayak SUV avg $61/day before waivers. CFC $7/day + ACRF 11. 1% apply regardless of insurance choice. Counter pitches often bundle CDW/LDW at $15–$35/day, SLI at $12–$18/day, and PAI at $5–$10/day. Premium cards (Amex Platinum, Chase Sapphire Reserve) may cover collision if you decline agency CDW and pay with that card — verify your Guide to Benefits before signing.

## Related

- https://www.seatacrentalcarfacility.com/en/knowledge/seatac-rental-sli-supplemental-liability
- https://www.seatacrentalcarfacility.com/en/knowledge/seatac-rental-cdw-vs-ldw-explained
- https://www.seatacrentalcarfacility.com/en/knowledge/credit-card-rental-insurance-seatac
- https://www.seatacrentalcarfacility.com/en/knowledge/rental-car-policies-cross-ref
- https://www.seatacrentalcarfacility.com/en/knowledge/rental-agencies-seatac-cross-ref