Trump's Golden Dome Missile Defense Costs $1.2T

President Donald Trump’s Golden Dome missile defense program is estimated to cost $1.2 trillion over 20 years, according to a new analysis from the Congressional Budget Office (CBO). This figure far exceeds initial projections of $175 billion, as stated by Trump last year, and even surpasses the Pentagon’s latest estimate of $185 billion. The CBO report, published Tuesday, reflects an illustrative approach rather than a specific administration proposal.

The futuristic system was ordered by Trump in an executive order during his first week in office. He stated that he expected it to be “fully operational before the end of my term,” which wraps up in January 2029. The program aims to expand ground- and space-based defenses, including advanced satellite networks and orbiting weapons, capable of detecting, intercepting, and stopping missiles at all major stages of a potential attack.

The CBO’s estimates are partly based on a lack of details from the Defense Department about what and how many systems will be deployed. The concept for the missile system is at least partly inspired by Israel’s multitiered defenses, known as the Iron Dome, which has played a key role in defending against rocket and missile fire. Congress has already approved roughly $24 billion for the initiative through Republicans’ tax and spending measure signed into law last summer.

The Golden Dome program envisions expanding ground-based defenses such as interceptor missiles, sensors, and command-and-control systems while adding space-based elements meant to detect, track, and potentially shoot down incoming threats from orbit. The CBO estimated acquisition costs alone for the system would total just over $1 trillion, with the space-based interceptor layer accounting for about 70 percent of acquisition costs.

Critics, including Senator Jeff Merkley (D-OR), have called the missile defense project “nothing more than a massive giveaway to defense contractors paid for entirely by working Americans.” The Pentagon’s Golden Dome office did not respond to requests for comment. Major defense contractors like Lockheed Martin, Northrop Grumman, RTX, and Boeing are expected to compete for various components of the Golden Dome program.

Congressional Republicans have earmarked $25 billion for the project in the 2025 One Big Beautiful Bill Act. The Pentagon has asked for an additional $17 billion in a reconciliation bill this year. The Trump administration's fiscal 2027 budget request includes $750 billion earmarked for the Golden Dome system, stating that it “keeps Americans safe, while using innovative program management and acquisition approaches to prudently employ taxpayer dollars.”

The CBO report indicates that the estimated system could counter a limited attack but would be overwhelmed by a large-scale one. Israel's Iron Dome has intercepted missiles from Iran and other localized groups but is designed for smaller areas and shorter-range threats, unlike the United States' need to defend against long-range attacks.