Thailand is the world's leading exporter of rice and a major exporter of other agricultural products. Government involvement in Thai rice markets has recently been characterized by a shift from net taxation to support, although at relatively low levels. Rice export taxes and input subsidies can be quantified using the producer subsidy equivalent (PSE), an aggregate measure of government intervention. Reducing government support, as measured by the PSE, could be accomplished by charging for irrigation or reimposing export taxation. The latter alternative would increase government intervention while lowering the PSE value.