In 2022, the tax basis of water conservancy construction fund is tax-free income, and the tax refund has been completed.

Water conservancy fund is a special fund for water conservancy construction, which consists of central water conservancy construction fund and local water conservancy construction fund. The central water conservancy construction fund is mainly used for the maintenance and construction of major river key projects related to the overall situation of national economic and social development. Local water conservancy construction funds are mainly used for urban flood control and the management, maintenance and construction of small and medium-sized rivers and lakes. The management expenses of major water conservancy construction projects across river basins and provinces (autonomous regions and municipalities directly under the Central Government) and key protection projects of transnational rivers and border rivers in China shall be borne by the central and local governments.