WASHINGTON — May 13, 2026 : The Congressional Budget Office (CBO) has estimated that the proposed Golden Dome for America missile defense system could cost approximately $1.2 trillion to develop, deploy and operate over the next two decades, according to a 12-page report released on May 12, 2026.
The assessment provides one of the most detailed public cost projections so far for the planned multi-layered national missile defense architecture intended to defend the United States against ballistic missiles, hypersonic weapons, cruise missiles and other advanced aerial threats.
Acquisition Costs Could Exceed $1 Trillion
According to the CBO, acquisition costs alone for the programme would surpass $1 trillion. The estimate includes interceptor systems, a space-based missile warning and tracking network, research and development activities, system integration, operational infrastructure and long-term performance upgrades.
The report identified the proposed space-based interceptor layer as the largest and most expensive component of the entire architecture. The orbital defense network, consisting of approximately 7,800 satellites, is projected to account for nearly 70 percent of acquisition costs and roughly 60 percent of the programme’s total projected cost over 20 years.
The Congressional Budget Office stated that deploying enough orbiting interceptors to counter approximately ten incoming ballistic missiles could alone require an estimated $720 billion in funding.
Major Gap Between Pentagon and CBO Estimates
The CBO projection is significantly higher than earlier estimates provided by the Trump administration and Pentagon officials.
President Donald Trump previously stated that the Golden Dome programme would cost approximately $175 billion, while Space Force Gen. Mike Guetlein, director of the Office of Golden Dome for America, estimated in March 2026 that the system would require around $185 billion through 2035 to achieve its planned “objective architecture.”
According to the CBO, the large difference between the estimates likely reflects major differences in the scale, structure and timeframe of the system being evaluated.
The report stated that the Pentagon’s proposed architecture may be substantially more limited than the broader multi-layered defense network modeled by the Congressional Budget Office under the framework established by the programme’s executive order.
The agency also noted that the Department of Defense could be expecting “significant funding from other accounts” to support portions of the programme, adding that both explanations may contribute to the discrepancy.
Funding Requests and FY2027 Defense Budget
Initial funding for the Golden Dome initiative was approved after Republicans in Congress allocated approximately $24.4 billion through the One Big Beautiful Bill Act signed into law by President Donald Trump on July 4, 2025.
The Pentagon is currently seeking an additional $17 billion for the programme through reconciliation measures.
Defense officials also stated that approximately $750 billion from the administration’s proposed $1.5 trillion fiscal year 2027 defense budget request is intended for missile defense systems, drones, artificial intelligence programmes and expansion of the U.S. defense industrial base.
The administration has described Golden Dome as part of a broader layered homeland defense strategy designed to strengthen national protection against evolving missile threats. Budget documents stated that the programme would rely on “innovative program management and acquisition approaches to prudently employ taxpayer dollars.”
Programme Origins and Strategic Objectives
The Golden Dome programme originated from a January 27, 2025 executive order titled “The Iron Dome for America,” which was later renamed Golden Dome for America.
The initiative calls for the development of a layered missile defense architecture capable of detecting, tracking and intercepting ballistic missiles, hypersonic glide vehicles, cruise missiles and other airborne threats targeting the United States.
The Congressional Budget Office said its projections were based on a notional architecture consistent with the capabilities outlined in the executive order. However, the report noted that the Department of Defense has not yet publicly released detailed plans for the final objective architecture, making precise long-term cost estimates difficult.
CBO Warns of Operational and Strategic Limitations
Despite describing the proposed network as substantially more capable than existing U.S. missile defenses, the CBO cautioned that the system would not provide complete protection against large-scale nuclear attacks launched by major powers such as Russia or China.
According to the report, the Golden Dome architecture “would be far more capable than defenses” currently available to the United States, but it “would not be an impenetrable shield or be able to fully counter a large attack” conducted by a peer nuclear adversary.
The agency also warned that deployment of the missile defense network could influence adversary behavior. The report stated that while the system could deter or defeat smaller missile raids during regional conflicts, it could also encourage rival powers to increase the scale of future attacks in an effort to overwhelm the defense architecture.
Defense officials nevertheless continue to support the programme, arguing that the system represents a major expansion of U.S. homeland missile defense capabilities and a long-term investment in layered national security infrastructure.
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