Calculating trip cost may not be as straightforward as we would all hope. For instance, costs that you do not have to pay before traveling, but will be assessed in the event of a covered cancellation, can be insured. Any money that you would lose if you have to cancel your trip before departure, or on the day of, is what you want to insure. The price of a travel insurance plan and the benefit eligibility rely on trip cost. Remember, you must insure 100% of your prepaid, non-refundable expenses to be eligible for certain benefits. Don't forget that you can always add trip cost to your plan after purchase. The key is to purchase a plan as soon as you make your first trip payment or book your flights. If you add costs as you get closer to your departure date, you can add this to your insured trip cost, but know those additions to your trip cost may result in a higher premium due to some benefit levels increasing.