The United States taxpayers will pay the United Nations approximately $3.024 billion in 2015, according to testimony by Brett Schaefer, a Heritage Foundation fellow, before the Senate Foreign Relations subcommittee responsible for multilateral institutions on May 6, 2015. This total accounts for $621.9 million toward the UN regular budget and $2.402 billion toward the UN peacekeeping budget. In contrast, 35 nations will pay less than a total of $29,000. Schaefer testified that the US' contributions continue to rise due to the UN's runaway budget which increased from nearly $15 billion in 2002 to nearly $41.5 billion in 2012. A major factor behind that increase is the "failure to arrest growth" in UN personnel costs which accounts for 70% of UN spending.
Schaefer pointed out that US contributions to the UN may be higher than reported: "there is also a lack of transparency and analysis on the U.S. side...(the) 2006 report confirmed that actual U.S. contributions to the U.N. were higher by about 25 percent than previously reported by the State Department. The reporting requirement lapsed in 2011. As a result, a comprehensive accounting of U.S. contributions to the U.N. system after FY 2010 is not available and the last reliable accounting by the OMB was for FY 2010, which reported contributions totaling $7.692 billion."
This figure is more than double today's figure, raising the question of what exactly is the true cost of US' membership to the UN.