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RDT&E Program Element · President's Budget PB2027

Ssn(x)

PE 0604850N·U.S. Navy·Approp. 1319 — RDT&E·BA5 — System Development & Demonstration
FY2027 Request
$315.9M
Navy · RDT&E
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U.S. Navy requests $315.9M in FY2027, sustained across the five-year plan. In the FY2027 defense authorization, the House funded it in full; the Senate funded it in full; House appropriators funded it in full. Rite Solutions leads the industry work.

FY2027 Request
$315.9M
▼ 6.0% vs FY2026
FY2026 Enacted
$336.0M
▲ 2.6% vs FY2025
FY2025 Actual
$327.4M
Prior year

For fiscal year 2027, the U.S. Navy is requesting $315.9M for Ssn(x) under RDT&E program element 0604850N, down 6.0% from FY2026.

Funding trajectory

Funding profile, FY2025–FY2031

Prior years are actuals, the budget year is the request, and the outyears are the FYDP plan. Estimate types are colored and never summed into one figure.

1002003004000327.4FY25ACTUAL336.0FY26ENACTED315.9FY27REQUEST308.4FY28366.1FY29402.9FY30410.3FY31
Actual Enacted Request Outyear (FYDP)
Fiscal YearEstimate TypeAmount ($M)
FY2025Actual327.4
FY2026Enacted336.0
FY2027Request315.9
FY2028Outyear308.4
FY2029Outyear366.1
FY2030Outyear402.9
FY2031Outyear410.3
Where it sits

Acquisition lifecycle

This program is funded in RDT&E Budget Activity 5 — System Development & Demonstration.

Complete
Research
BA 1–2
Complete
Advanced Technology
BA 3
Complete
Prototyping
BA 4
Current
Development & Fielding
BA 5–7
Inside the program element

1 project rolls up into PE 0604850N

Projects are the summable leaves — the PE total is their sum, never added to it. Program elements and projects carry the full five-year plan; activities stop at the budget year. This PE moves -6% overall, which can hide much larger swings below.

Project 2368

SSN(X) Class Submarine Development

$315.9MFY2027 request ▼ 6%
FY2025 actual$327.4M
FY2026 enacted$336.0M
FY2027 request$315.9M
Product DevelopmentSupportManagement Services

SSN(X) will be designed to enter, fight, and deny within heavily defended adversary bastions from the sea to the seabed. SSN(X) will deliver increased warfighting performance through larger payload volume, improved lethality and survivability, and organic hosting of Robotic and Autonomous Systems (RAS). These capabilities assure access to threat-denied areas, deny adversary safe havens, and ensure flexibility. This project encompasses Navy RDT&E efforts required to design the next SSN.

Accomplishments / planned programs (R-2A) — prior, current and budget year only
Product Development▼ 3%
FY2025 actual$302.6M
FY2026 enacted$310.1M
FY2027 request$301.4M

Whole Ship concept maturation by shipbuilders and government teams informed by on-going technology development that will frame the requirements for the Capability Development Document (CDD). Continue targeted advanced technology development with Virginia Class Block VII and VIII to reduce risk by maturing technologies and maintaining the…

Read the FY2027 plan →
Support▼ 49%
FY2025 actual$18.0M
FY2026 enacted$18.3M
FY2027 request$9.4M

FY2027 planned work Begin Ship Specification development efforts. Execute the Research and Development Roadmap informed by technology and concept maturation. Continue leading integrated product teams and working groups between various field activities supporting SSN(X) R&D and concept efforts. Conduct reliability and maintainability analysis to inform the sustainment requirement within the Capability Development Document. Provide cost and schedule impacts of the various shipbuilder designs to support the CDD development.

FY2026 to FY2027 change Decrease due to reduction in government and contractor engineering services.

FY2026 plans — current year Continue developing near-term and long-term schedules and identifying resource requirements to support R&D and concept development for SSN(X). Revise Research and Development Roadmap informed by AoA and concept maturation. Continue leading integrated product teams and working groups between various field activities supporting SSN(X) R&D and concept efforts. Develop preliminary maintenance life cycle considerations to drive increased Operational Availability. Trade space reduction and identification of Critical Technologies.

Management Services▼ 32%
FY2025 actual$6.8M
FY2026 enacted$7.5M
FY2027 request$5.1M

FY2027 planned work Continue management efforts to ensure timely and quality program deliverables to support Milestone A and begin development of the Acquisition Strategy. Continue providing management support for program office administration. Conduct travel to monitor performing activities performance and technology development efforts.

FY2026 to FY2027 change Decrease due to reduction in contractor support services.

FY2026 plans — current year Continue management efforts to ensure timely and quality program deliverables. Continue providing management support for program office administration. Conduct travel to monitor performing activities performance and technology development efforts.

Congressional action

Congressional marks

Committee marks on the FY2027 request. Adds and cuts are reconciled in conference before they become law.

RequestPresident's Budget
$315.9M
House NDAA (HASC)HASC
$315.9M full · +$0
Senate NDAA (SASC)SASC
$315.9M full · +$0
House Approps (HAC-D)HAC_D
$315.9M full · +$0
unresolved as of 2026-07-27. These are FY2027 authorization marks (NDAA); appropriations and the conference agreement may differ.
Who's building it

Where the FY2027 request goes

Performers named in the R-3 exhibit, resolved into industry, government-lab, and unspecified shares. Budget-justification contract funding, not obligations.

Where FY2027 funding flowsShare$M
Industry primes2.0%6.2
Government labs & warfare centers25%78.6
Other / unspecified73%231.1
FY2027 request100%315.9
Program detail

Mission & acquisition strategy

The National Defense Strategy (NDS) requires the United States to have the most lethal and capable military in the world. The U.S. Navy must meet the rising challenge by delivering a new attack submarine to maintain superiority in the undersea domain. SSN(X) will significantly contribute to rebuilding our military, reinforcing deterrence in the undersea, and building lethality in the Joint Force. It will provide enhanced lethality, survivability, speed and operational availability to maintain undersea supremacy against growing threats. SSN(X) will conduct full spectrum undersea warfare and employ and coordinate with Robotic and Autonomous Systems (RAS) and sensors as a force multiplier.

The formal acquisition strategy for SSN(X) will be drafted post Milestone A. Preliminary Design for SSN(X) will be accomplished through a collaborative Navy-Industry effort to maximize the benefits of competition between the potential shipbuilders.

Project 2368 — SSN(X) Class Submarine Development
  • Product Development
  • Support
  • Management Services
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Answers are generated from the figures on this page — the FY2027 justification exhibits and the marks tracked above — and nothing else is consulted. Confirm any figure against the cited exhibit before you use it externally.

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Questions this page can answer
How does the FY2027 request compare with FY2026, and what does the five-year plan show?What did the FY2027 NDAA committees do to this request?How is the FY2027 request split between industry and government performers?In plain terms, what is this program element for and how is it being acquired?
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This page carries the budget justification and the NDAA marks — nothing else. For what Rite Solutions has actually been obligated, the ledger is at hitchintel.com/vendors; for live solicitations, hitchintel.com/opportunities. Both are member surfaces.

Provenance

Cite this page

Sources
FY2027 Department of the Navy RDT&E Budget Justification · Exhibits R-2 / R-3 · PE 0604850N (President's Budget PB2027) — and FY2027 NDAA committee marks, as tracked 2026-07-27.
Suggested citation
HitchAI, "Ssn(x) (PE 0604850N)," federal budget intelligence, PB2027 vintage. hitchintel.com/programs/0604850N
Machine access
Markdown twin /programs/0604850N.md · MCP mcp.hitchintel.com → budget_get_program_element, budget_get_cong_marks