The direct costs of U.S. participation in NATO are far more modest than the nearly $900 billion in national security spending just authorized by Congress in the FY 2025 National Defense Authorization Act. NATO’s direct costs to member nations, often referred to as “common funding,” came to €4.6 billion in 2024, or about $4.7 billion in U.S. dollars, with each member nation contributing a percentage of their Gross National Income (GNI). U.S. contributions accounted for about 16 percent of these common funds in 2024—roughly $753 million. That’s less than 0.1 percent of total U.S. military expenditures. Military construction costs and funding for joint military exercises can add a bit more on top of that, but those costs vary from year to year and are generally lower than U.S. contributions to NATO’s common funds.
https://www.taxpayer.net/national-security/how-much-does-nato-cost-the-united-states/
