United Nations Issues: U.S. Funding of U.N. Peacekeeping [Updated March 23, 2020] [open pdf - 463KB]
From the Document: "The United States is the single largest financial contributor to United Nations (U.N.) peacekeeping activities. Congress authorizes and appropriates U.S. contributions, and it has an ongoing interest in ensuring such funding is used as efficiently and effectively as possible. The United States, as a permanent member of the U.N. Security Council, plays a key role in establishing, renewing, and funding U.N. peacekeeping operations. For 2020, the United Nations assessed the U.S. share of U.N. peacekeeping budgets at 27.89%; however, since 1994 Congress has capped the U.S. payment at 25% due to concerns that U.S. assessments are too high. For FY2021, the Trump Administration proposed $1.07 billion for U.N. peacekeeping, a 29% decrease from the enacted FY2020 level of $1.52 billion."
CRS In Focus, IF10597
Congressional Research Service: https://crsreports.congress.gov/