How it works
Trip insurance percentage rules govern how much of a trip must be insured and what happens when you insure less. The central convention is the 100% rule: cancellation coverage should equal your full prepaid, non-refundable trip cost, because most plans pay the lesser of loss and insured amount - insure $4,500 of a $6,000 trip and any covered cancellation strands $1,500 permanently. Underinsuring cuts harder still, because proportional settlement scales partial claims down by the ratio of insured to required amounts: losing half this trip pays not $3,000 but roughly $2,250. The second rule caps trip interruption at 150% of trip cost, reflecting the changed flights home a mid-trip emergency forces; coverage chosen below the cancellation figure leaves that headroom exposed too. Timing rules bind hardest of all - pre-existing-condition waivers generally require purchase within 14 to 21 days of the first deposit, and cancel-for-any-reason adds both that deadline and the 100% requirement. Enter what you booked and what you actually insured; the calculator prices each rule you currently fail, so the fix becomes arithmetic rather than fine print archaeology.
Formula
required = prepaid trip cost | pro-rata payout = loss x (insured / required) | interruption ceiling = 150% x trip cost
Tips
- Insure 100% of prepaid non-refundable costs - refundable bookings inflate the premium without adding protection.
- Buy within 14-21 days of the first deposit or lose the pre-existing waiver and CFAR eligibility permanently.
- Pro-rata settlement means partial underinsurance fails twice - even small claims pay proportionally less.
- Interruption pays up to 150% of trip cost; budget the changed-flight home, not just the forfeited tour.
- Card travel protections rarely satisfy the 100% rule - verify them before assuming you are already covered.
Frequently asked questions
- Should I insure 100% of my trip cost?
- Yes - the 100% rule is why. Plans pay the lesser of your loss and your insured amount, and most carriers require full trip cost for their strongest benefits anyway. On a $6,000 trip, insuring $4,500 saves perhaps $60 of premium but strands $1,500 in any covered cancellation.
- What happens if I underinsure a trip?
- Two penalties stack. Any claim pays at most the insured amount, and many plans apply proportional settlement: a $3,000 partial loss on a trip insured at 75% returns roughly $2,250 rather than $3,000. Underinsuring therefore costs more than the coverage slice you skipped.
- Why does trip interruption cover 150% of trip cost?
- Interrupted trips cost more than cancelled ones: you forfeit the unused remainder and then buy last-minute transport home, sometimes from abroad. The 150% ceiling exists to absorb that overshoot; coverage bought below the full trip amount leaves everything between your limit and that ceiling exposed.
- Does cancel-for-any-reason require insuring the full trip?
- Yes - CFAR universally demands 100% of prepaid trip cost, must be purchased within roughly 14 to 21 days of the first deposit, and still reimburses only 50% to 75% of that cost. Missing either requirement voids the upgrade while you continue paying its 40%-or-so premium load.
- How soon after booking must I buy travel insurance?
- The valuable windows close fast: pre-existing-condition waivers, CFAR and supplier-financial-default coverage generally require purchase within 14 to 21 days of your first payment. Basic cancellation and medical cover stays purchasable until departure, but those three benefits disappear once the window shuts.