The Congressional Budget Office released a report this week estimating that President Trump’s proposed Golden Dome national missile defense system could cost $1.2 trillion over 20 years, a figure more than six times larger than the administration’s own publicly stated projections.
The CBO’s analysis, one of the most detailed independent assessments of the project to date, put total acquisition costs at just over $1 trillion. Annual operations and maintenance costs would account for the remainder.
The largest single cost driver is a planned space-based interceptor constellation. The CBO estimated that deploying a network of roughly 7,800 satellites capable of simultaneously engaging at least 10 intercontinental ballistic missiles would cost $723 billion to acquire and deploy alone. Ground- and sea-based layers, which would rely heavily on existing systems including Terminal High Altitude Area Defense, or THAAD, batteries, would run about $139 billion by comparison.
The White House has estimated the full Golden Dome project at approximately $185 billion over three years. Gen. Michael A. Guetlein, the U.S. Space Force’s vice chief of space operations and the administration’s point man on the program, recently revised the administration’s figure upward from $175 billion to account for additional space-based components. Trump has said he wants the system operational by 2028.
So far, only about $23 billion has been formally allocated. The White House’s 2027 budget request includes an additional $17.1 billion, bringing committed funding to roughly $40 billion.
The CBO acknowledged significant uncertainty in its estimates, noting that much of the Golden Dome’s design remains classified and that key architectural decisions have not been finalized.
“Of the $1.2 trillion amount, acquisition costs for the notional system would total just over $1 trillion,” the CBO report stated. “That amount includes costs for the system’s major components, namely the interceptor layers and a space-based missile warning and tracking system.”
Even at full buildout, the CBO warned, the system would not constitute an absolute defense. “Although the notional NMD system analyzed by CBO would be far more capable than defenses the United States fields today, it would not be an impenetrable shield or be able to fully counter a large attack of the sort that Russia or China might be able to launch,” the report said.
Retired Air Force Gen. John E. Hyten, former vice chairman of the Joint Chiefs of Staff and former commander of U.S. Strategic Command, raised doubts about whether the administration’s three-year timeline is achievable given the complexity of the project and the number of military branches, federal agencies, and contractors involved.
“Will we get there in three years? Not with the current bureaucracy. But they gave Gen. Mike Guetlein all the authority and responsibility to do that. Now will they let him?” Hyten said. “If they don’t let him, you’ll not get there in three years. We won’t get there in six years, we won’t get there in 10 years.”
The CBO’s analysis assumed four layers of missile interception: a space-based layer, two wide-area ground-based layers, and additional regional sector defenses capable of providing extra protection for major cities and critical military infrastructure.
