14 January 2014In this paper we aim at theoretically grounding the Reducing Emissions from Deforestation and Forest Degradation + (REDD+) scheme as a contractual relationship between countries in the light of the theory of incentives. Considering incomplete information about reference levels of deforestation as well as exogenous implementation and transaction costs, we compare two types of contracts: a deforestation performance based contract and a conditional avoided deforestation-based contract. Because of the implementation and transaction costs, each kind of REDD+ contract implies a dramaically different information rent / effciency trade-off. If the contract is performancebased (resp. conditionality-based), information rents are awarded to countries with the ex ante lowest (resp. highest) deforestation. In a simple quadratic setting, there is a reference level threshold in terms of effciency towards less deforestation. In terms of expected welfare, conditional avoided deforestation-based schemes are preferred.