As ordered reported by the Senate Committee on Commerce, Science, and Transportation on July 30, 2025
At a GlanceS. 2351, Space Exploration Research ActAs ordered reported by the Senate Committee on Commerce, Science, and Transportation on July 30, 2025
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By Fiscal Year, Millions of Dollars | 2026 | 2026-2031 | 2026-2036 | ||||||||
Direct Spending (Outlays) | 0 | 19 | 62** | ||||||||
Revenues | 0 | 0 | 0 | ||||||||
Increase or Decrease (-) in the Deficit | 0 | 19 | 62 | ||||||||
Spending Subject to Appropriation (Outlays) | * | * | not estimated | ||||||||
Increases net direct spending in any of the four consecutive 10-year periods beginning in 2037?
| < $2.5 billion
| Statutory pay-as-you-go procedures apply?
| Yes
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Mandate Effects
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Increases on-budget deficits in any of the four consecutive 10-year periods beginning in 2037?
| < $5 billion
| Contains intergovernmental mandate?
| No
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Contains private-sector mandate?
| No
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* = between zero and $500,000. ** On April 13, 2026, CBO reposted this estimate to correct the amount shown for direct spending (outlays).
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The bill would
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Estimated budgetary effects would mainly stem from
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Areas of significant uncertainty include
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On This Page
Bill Summary
S. 2351 would expand the authority of the National Aeronautics and Space Administration (NASA) to enter into leases with other entities (including other federal agencies or state and local governments) by allowing the agency to lease back properties that are used to support its mission. Under current law, NASA has broad authority to enter into leases, including enhanced-use leases and leases under the National Historic Preservation Act (NHPA). NASA’s enhanced-use lease authority expires on December 31, 2032; however, its authority under NHPA is permanent. The bill also would require NASA to report annually to the Congress on those leases.
Estimated Federal Cost
Table 1. Estimated Budgetary Effects of S. 2351 | |||||||||||||
By Fiscal Year, Millions of Dollars | |||||||||||||
2026 | 2027 | 2028 | 2029 | 2030 | 2031 | 2032 | 2033 | 2034 | 2035 | 2036 | 2026-2031 | 2026-2036 | |
Increases in Direct Spending | |||||||||||||
Estimated Budget Authority | 0 | 10 | 10 | 10 | 10 | 10 | 10 | 8 | 8 | 8 | 8 | 50 | 92 |
Estimated Outlays | 0 | * | 1 | 3 | 6 | 9 | 9 | 9 | 9 | 8 | 8 | 19 | 62 |
* = between zero and $500,000. CBO estimates that implementing the bill would increase spending subject to appropriation by less than $500,000 in every year and over the 2026-2031 period. | |||||||||||||
Basis of Estimate
Under the bill, NASA’s authority to lease back a given property mostly or entirely for governmental use would increase the likelihood that third-party investments would be used for governmental purposes and would thus increase direct spending.
Direct Spending
By allowing NASA to lease back property for up to 50 years, S. 2351 would increase the likelihood that third-party investments would be used for governmental purposes and would thus increase direct spending relative to current law. Using information from NASA on current leasing and expected lease payments, and based on historical spending patterns for similar activities, CBO estimates that enacting the bill would increase commitments for the construction or improvement of NASA property by about $10 million annually, resulting in an increase in direct spending of $62 million over the 2026‑2036 period. That estimate incorporates the expectation that annual leasing activity under the bill would decline starting in 2033 when NASA’s enhanced-use lease authority is scheduled to expire.
Spending Subject to Appropriation
S. 2351 would require NASA to report to the Congress each year on its enhanced-use leases. Based on the costs of similar activities, CBO estimates that implementing that provision would cost NASA less than $500,000 over the 2026-2031 period. Any related spending would be subject to the availability of appropriated funds.
Uncertainty
Pay-As-You-Go Considerations
Increase in Long-Term Net Direct Spending and Deficits
CBO estimates that enacting S. 2351 would increase on‑budget deficits by less than $5 billion in any of the four consecutive 10-year periods beginning in 2037.
Mandates
Estimate Prepared By
Mandates: Brandon Lever
Estimate Reviewed By
Ann E. Futrell
Chief, Natural and Physical Resources Cost Estimates Unit
Kathleen FitzGerald
Chief, Public and Private Mandates Unit
H. Samuel Papenfuss
Deputy Director of Budget Analysis
Estimate Approved By

Phillip L. Swagel
Director, Congressional Budget Office