Actual Total Loss and Constructive Total Loss

These two terms are used to differentiate the degree of proof where a vessel or cargo has been lost.
An Actual Total Loss refers to the situation where the position is clear and a Constructive Total Loss refers to the situation where a loss is inferred. In practice, a Constructive Total Loss might also be used to describe a loss where the cost of repair is not economic; i.e. a 'write-off'.
The different terms refer to the difficulties of proving a loss where there might be no evidence of such a loss. In this respect, marine insurance differs from non-marine insurance, where the insured is required to prove his loss. Traditionally, in law, marine insurance was seen as an insurance of 'the adventure', with insurers having a stake and an interest in the vessel and/ or the cargo rather than, simply, an interest in the financial consequences of the subject-matter's survival.