Glossary
Supplemental Liability Protection (SLP)
An optional add-on that raises the third-party liability cover limit above the legal minimum bundled in the rental rate — typically up to USD 1 million in the US market.
Supplemental Liability Protection (SLP, sometimes ALI — Additional Liability Insurance) is an upsell on top of the baseline TPL that comes with a rental. The baseline is set by the legal minimum in the rental jurisdiction; for international travellers in the US that minimum is well below what claim awards can reach, which is why SLP is one of the most marketed extras at US rental counters.
SLP does not change CDW or PAI — it only raises the cap on what the insurer will pay third parties for injury or property damage the renter causes. Limits are usually offered as banded packages (USD 300k / 500k / 1M) at a per-day price. Operators outside the US sell SLP much less because EU statutory limits are already high and renters perceive the upsell as unnecessary.
In renviq, SLP is modelled as a per-day priced extra with a stored coverage cap. When the renter selects an SLP tier, the agreement template auto-prints the elevated limit so the contract reflects the actual coverage being sold rather than the baseline.