Federal Agency Buying Patterns: How the Top 10 Agencies Spend Their Budgets

The federal government spent $755 billion on contracts in FY2024, spread across more than 100 agencies. But this spending is not evenly distributed. The top 10 agencies account for roughly 93% of all federal procurement dollars. If you are not tracking how these agencies buy, you are flying blind in a market that rewards preparation.

This guide profiles each of the top 10 federal agencies by contract spending, covering what they buy, how they buy it, when they buy the most, and how you can position your company to capture their business.

Overview of the Federal Procurement Landscape

Before diving into individual agencies, it helps to understand the scale and structure of federal procurement.

Key Market Statistics

Spending by Category

Federal procurement spending broadly falls into these categories:

• Products (supplies and equipment): ~40% of total spending
• Services (professional, IT, management): ~45% of total spending
• Research and Development: ~10% of total spending
• Construction: ~5% of total spending

The services share has grown steadily over the past two decades as agencies increasingly outsource functions that were previously performed in-house.

The Fiscal Year Calendar

The federal fiscal year runs from October 1 to September 30. This calendar drives buying behavior across every agency:

The Q4 spending surge is real and dramatic. Federal agencies typically obligate 30-40% of their annual contract spending in Q4, with September alone often accounting for 15-20% of the total year. This happens because unspent funds often cannot be carried over to the next fiscal year. "Use it or lose it" drives agencies to accelerate procurements in August and September.

For contractors, this means:

• Position yourself early in the fiscal year (Q1-Q2) through market research and relationship building
• Have your proposals, quotes, and capability statements ready by Q3
• Be prepared to respond quickly to urgent Q4 solicitations
• Expect shorter evaluation timelines for Q4 awards

1. Department of Defense (DoD) - $464 Billion (59.87%)

The Department of Defense is by far the largest buyer in the federal government, accounting for nearly 60 cents of every federal procurement dollar. DoD procurement is a market unto itself, larger than the GDP of most countries.

What DoD Buys

DoD spending spans virtually every product and service category:

Breakdown by Service Branch and Agency

DoD is not a single buyer. It comprises multiple sub-agencies, each with distinct procurement patterns:

• U.S. Army: $130B+ in contract obligations. Heavy on vehicles, weapons, IT, and base operations support.
• U.S. Navy (including Marine Corps): $120B+ in contract obligations. Shipbuilding, aviation, submarine maintenance, and base infrastructure.
• U.S. Air Force: $100B+ in contract obligations. Aircraft, space systems, IT, and base operations.
• Defense Logistics Agency (DLA): $45B+ in contract obligations. The largest combat logistics support agency, buying food, fuel, medical supplies, construction materials, and spare parts for all services.
• Defense Information Systems Agency (DISA): $8B+ in contract obligations. Enterprise IT, communications, and cybersecurity for the entire DoD.
• Missile Defense Agency (MDA): $10B+ in contract obligations. Missile defense systems and R&D.

Preferred Contract Vehicles

DoD uses a wide range of contract vehicles:

• GSA Multiple Award Schedules (especially IT Schedule 70/MAS)
• DoD-specific IDIQs: SEWP, ENCORE III, OASIS+, Alliant 2
• Agency BPAs (Blanket Purchase Agreements)
• Other Transaction Authorities (OTAs): Increasingly used for rapid prototyping and innovation
• Small Business Innovation Research (SBIR) / Small Business Technology Transfer (STTR)

Small Business Goals and Performance

DoD's small business prime contracting goal is 23%, consistent with the government-wide target. DoD has historically met or come close to this goal, directing over $100 billion annually to small businesses. Key set-aside categories include:

• Small Business (SB)
• 8(a) Business Development
• HUBZone
• Service-Disabled Veteran-Owned Small Business (SDVOSB)
• Women-Owned Small Business (WOSB)

Buying Season Patterns

DoD follows the government-wide Q4 surge pattern, but with additional patterns:

• Continuing Resolutions (CRs): DoD is frequently affected by CRs at the start of the fiscal year, which limit new contract starts
• NDAA impact: The National Defense Authorization Act can shift spending priorities mid-year
• End-of-year spending: Army and Air Force are particularly aggressive in September spending
• DLA buying: DLA procurement is more evenly distributed throughout the year due to consumable supply needs

How to Find DoD Opportunities

• SAM.gov for all public solicitations
• DoD Procurement Forecasts published by each service branch
• Defense Innovation Unit (DIU) for technology companies
• Army Forecast Tool, Navy FPDS data, Air Force procurement portals

2. Department of Veterans Affairs (VA) - $78 Billion

The VA is the second-largest federal buyer and one of the fastest-growing procurement agencies, driven by expanding healthcare services for the nation's veterans.

What VA Buys

Preferred Contract Vehicles

• VA-specific IDIQs (T4NG for IT services, VECTOR for engineering)
• Federal Supply Schedules (FSS) managed by VA's National Acquisition Center
• GSA Multiple Award Schedules
• VA Medical/Surgical Prime Vendor (MSPV) program
• Blanket Purchase Agreements (BPAs)

Small Business Performance

The VA consistently exceeds its small business goals, often directing 30%+ of contract spending to small businesses. The VA has been one of the strongest agencies for SDVOSB (Service-Disabled Veteran-Owned Small Business) contracting, given its veteran-focused mission.

Key programs for small businesses:

• Veterans First Contracting Program: Gives priority to SDVOSB and VOSB firms for VA procurements
• VA OSDBU: Active in connecting small businesses with VA contracting opportunities

Buying Season Patterns

• The VA's healthcare procurement is year-round due to continuous patient care needs
• IT spending tends to concentrate in Q3 and Q4
• Construction follows a seasonal pattern with planning in Q1-Q2 and awards in Q3-Q4
• The VA Electronic Health Record Modernization (EHRM) program drives significant multi-year IT spending

Key Contracting Offices

• Strategic Acquisition Center (SAC) in Frederick, MD
• Technology Acquisition Center (TAC) in Eatontown, NJ
• National Acquisition Center (NAC) in Hines, IL
• Network Contracting Offices (NCOs) at each VISN (Veterans Integrated Service Network)

3. Department of Health and Human Services (HHS) - $31 Billion

HHS is a diverse agency focused on healthcare, biomedical research, public health, and social services.

What HHS Buys

Key Sub-Agencies

• National Institutes of Health (NIH): $12B+ in contracts. The largest biomedical research funder in the world.
• Centers for Disease Control and Prevention (CDC): $5B+ in contracts. Disease prevention, surveillance, and emergency response.
• Centers for Medicare and Medicaid Services (CMS): $4B+ in contracts. IT systems for Medicare/Medicaid administration.
• Biomedical Advanced Research and Development Authority (BARDA): Variable spending. Medical countermeasure development.

Preferred Contract Vehicles

• NIH CIO-SP3 (and successor): Government-wide IT services contract
• CMS IT IDIQs for Medicare/Medicaid systems
• NIH NITAAC GWACs (CIO-SP3, CIO-CS)
• GSA Multiple Award Schedules
• Broad Agency Announcements (BAAs) for research

Small Business Performance

HHS has a strong track record on small business goals, with NIH particularly active in SBIR/STTR funding. Research-oriented small businesses find significant opportunities at NIH and CDC.

Buying Season Patterns

• NIH: Grant and contract awards peak in September (Q4 surge)
• CDC: Emergency preparedness funding can spike unpredictably based on public health events
• CMS: IT modernization spending is more evenly distributed
• BARDA: Pandemic-related spending created significant spikes but has normalized

4. Department of Homeland Security (DHS) - $28 Billion

DHS is a post-9/11 agency that encompasses border security, emergency management, cybersecurity, immigration, and transportation security.

What DHS Buys

Key Sub-Agencies

• Customs and Border Protection (CBP): $8B+ in contracts. Border technology, surveillance, infrastructure.
• Federal Emergency Management Agency (FEMA): $5B+ in contracts. Disaster response, mitigation, grants management.
• Transportation Security Administration (TSA): $4B+ in contracts. Screening technology, IT, officer support.
• U.S. Coast Guard: $4B+ in contracts. Ship and aircraft acquisition, maintenance, IT.
• Cybersecurity and Infrastructure Security Agency (CISA): $3B+ in contracts. National cybersecurity programs.
• Immigration and Customs Enforcement (ICE): $3B+ in contracts. Detention, investigations, IT.

Preferred Contract Vehicles

• EAGLE II (and successor) for IT services
• FirstSource II for small business IT
• PACTS III for professional services
• GSA Multiple Award Schedules
• FEMA-specific emergency response vehicles

Small Business Performance

DHS has been a strong performer on small business contracting goals, regularly exceeding its targets. CISA and the Science and Technology Directorate (S&T) are particularly open to innovative small businesses.

Buying Season Patterns

• FEMA spending is event-driven: Hurricane season (June-November) and disaster declarations drive surge procurement
• IT and cybersecurity: Follow the typical Q4 surge pattern
• CBP border technology: Spending patterns can shift based on policy priorities
• Coast Guard acquisitions: Major platform acquisitions (ships, aircraft) follow multi-year timelines

5. Department of Energy (DOE) - $25 Billion

The Department of Energy operates the nation's nuclear weapons complex, national laboratories, and clean energy programs.

What DOE Buys

Unique Procurement Features

DOE procurement is unique because of the Management and Operating (M&O) contract model. The 17 national laboratories (including Los Alamos, Sandia, Oak Ridge, and Lawrence Livermore) are operated by contractors under massive M&O contracts worth billions of dollars each. These M&O contracts are among the largest single contracts in the federal government.

For smaller contractors, opportunities come through:

• Subcontracting to M&O contractors at national labs
• Direct DOE contracts for IT, professional services, and construction
• NNSA contracts for nuclear security work
• ARPA-E funding for energy innovation
• Loan Programs Office supporting clean energy projects

Preferred Contract Vehicles

• DOE-specific IDIQs for IT and professional services
• GSA Multiple Award Schedules
• National lab subcontracting opportunities
• Small Business Innovation Research (SBIR)
• Broad Agency Announcements (BAAs) for R&D

Small Business Performance

DOE has historically struggled to meet small business goals due to the dominance of large M&O contracts. However, DOE has increased efforts through set-asides, mentor-protege programs, and requirements for M&O contractors to subcontract to small businesses.

Buying Season Patterns

• M&O contracts are on multi-year cycles (5-10 year base periods)
• R&D funding follows congressional appropriations, with awards peaking in Q3-Q4
• Clean energy spending has surged with the Inflation Reduction Act and Infrastructure Investment and Jobs Act
• Environmental cleanup is relatively steady year-round

6. NASA - $20 Billion

NASA is the premier space and aeronautics research agency, with procurement driven by exploration missions, scientific research, and IT needs.

What NASA Buys

Key Centers and Buying Patterns

Each NASA center has distinct procurement needs:

• Johnson Space Center (Houston): Human spaceflight, crew systems, mission control
• Kennedy Space Center (Florida): Launch operations, ground systems
• Goddard Space Flight Center (Maryland): Earth science, Hubble/Webb, IT
• Jet Propulsion Laboratory (California): Robotic missions, deep space exploration
• Marshall Space Flight Center (Alabama): Propulsion, SLS development
• Langley Research Center (Virginia): Aeronautics, atmospheric science

Preferred Contract Vehicles

• SEWP V (Solutions for Enterprise-Wide Procurement): Government-wide IT hardware/software, managed by NASA
• OASIS+ for professional services
• Center-specific IDIQs for services at each NASA center
• GSA Multiple Award Schedules
• SBIR/STTR programs (NASA has one of the largest SBIR programs)

Small Business Performance

NASA consistently ranks among the top agencies for small business goal achievement. The agency has a strong SBIR program and actively supports small business participation in major programs through subcontracting requirements.

Buying Season Patterns

• Major programs (Artemis, ISS, Mars missions) have steady multi-year funding
• SBIR/STTR solicitations follow a regular annual cycle
• IT procurement follows the Q4 surge pattern
• R&D contracts often align with congressional appropriation cycles

7. General Services Administration (GSA) - $18 Billion

GSA is unique because it is both a buyer for its own needs and a provider of government-wide contract vehicles used by every other agency.

What GSA Buys and Enables

Government-Wide Contract Vehicles

GSA's primary role for contractors is managing the vehicles that other agencies use to buy:

• Multiple Award Schedule (MAS): The largest government contract vehicle, covering nearly everything from IT to furniture to professional services
• Alliant 2: Large-scale IT solutions GWAC
• 8(a) STARS III: IT services for 8(a) firms
• VETS 2: IT services for SDVOSB firms
• OASIS+: Professional services (under transition)
• GSA Advantage: Online ordering platform for schedule items

Small Business Performance

GSA is a top performer on small business goals, in part because many of its contract vehicles are specifically designed for small businesses (8(a) STARS, VETS 2, HUBZone-specific vehicles).

Buying Season Patterns

• MAS ordering occurs year-round by all agencies
• Building and facilities spending follows lease renewal cycles
• IT GWACs see the Q4 surge as agencies use them for end-of-year purchases
• GSA's own procurement follows the standard fiscal year cycle

Key Contracting Offices

• Federal Acquisition Service (FAS): Manages schedules and GWACs
• Public Buildings Service (PBS): Building construction, leasing, and management
• Regional offices: 11 regions with local contracting authority

8. Department of Justice (DOJ) - $12 Billion

DOJ encompasses law enforcement, litigation, prisons, and national security.

What DOJ Buys

Key Sub-Agencies

• Bureau of Prisons (BOP): $5B+ in contracts. The largest DOJ buyer, covering facility management, healthcare, food services, and IT.
• Federal Bureau of Investigation (FBI): $3B+ in contracts. IT, surveillance technology, laboratory services, and operational support.
• Drug Enforcement Administration (DEA): $1.5B+ in contracts. IT, investigative support, laboratory services.
• Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF): $0.5B+ in contracts.
• U.S. Marshals Service: $1B+ in contracts. Detention, prisoner transport, IT.

Preferred Contract Vehicles

• DOJ-specific IDIQs for IT and professional services
• Justice Management Division (JMD) managed contracts
• GSA Multiple Award Schedules
• BOP-specific contracts for prison services

Small Business Performance

DOJ has met small business goals in recent years, with BOP and FBI being the largest buyers from small firms. IT services and professional support offer the best entry points for small businesses.

Buying Season Patterns

• BOP operations are continuous, with steady procurement year-round
• IT modernization follows the Q4 surge pattern
• Law enforcement equipment purchases often spike following major policy initiatives or budgetary allocations
• Construction follows multi-year timelines

9. Department of State - $11 Billion

The State Department has unique procurement needs driven by its global mission of diplomacy and overseas operations.

What State Buys

Unique Procurement Characteristics

State Department procurement is distinctive because:

• Many contracts require overseas performance in challenging environments
• Security clearances are required for most work
• Diplomatic Security contracts are among the largest in the federal government
• Bureau of Overseas Buildings Operations (OBO) manages a massive global construction portfolio
• USAID (sometimes counted with State) adds significant international development spending

Preferred Contract Vehicles

• State-specific IDIQs for IT and professional services
• Worldwide Protective Services (WPS) for security
• GSA Multiple Award Schedules
• USAID-specific vehicles for international development

Small Business Performance

State faces challenges meeting small business goals because of the specialized nature of overseas work. However, IT, professional services, and domestic support functions offer meaningful small business opportunities.

Buying Season Patterns

• Construction follows multi-year embassy building programs
• Security contracts are on long-term cycles with periodic recompetitions
• IT spending follows the Q4 surge
• Foreign assistance spending is tied to congressional appropriations and international events

10. Department of Transportation (DOT) - $10 Billion

DOT oversees the nation's transportation infrastructure, including aviation, highways, railroads, and maritime.

What DOT Buys

Key Sub-Agencies

• Federal Aviation Administration (FAA): $6B+ in contracts. The dominant DOT buyer, covering air traffic control systems, NextGen modernization, airport infrastructure, and IT.
• Federal Highway Administration (FHWA): $2B+ in contracts. Highway engineering, research, and technical assistance.
• National Highway Traffic Safety Administration (NHTSA): $0.5B+ in contracts. Vehicle safety research and testing.
• Federal Transit Administration (FTA): $0.5B+ in contracts. Public transit support.
• Federal Railroad Administration (FRA): $0.3B+ in contracts. Railroad safety and infrastructure.

Preferred Contract Vehicles

• FAA eFAST (Electronic FAA Accelerated and Simplified Tasks) for small business IT and engineering
• DOT-specific IDIQs for IT and engineering services
• GSA Multiple Award Schedules
• Infrastructure Investment and Jobs Act (IIJA) funded vehicles

Small Business Performance

DOT has a solid small business record, with FAA eFAST being a particularly valuable vehicle for small business IT and engineering firms. The Infrastructure Investment and Jobs Act has created additional small business opportunities.

Buying Season Patterns

• FAA NextGen spending follows multi-year program milestones
• Highway funding follows the federal-aid highway program cycle
• IIJA spending has created a multi-year spending wave through 2026
• General IT and services follow the Q4 surge pattern

How to Use Agency Buying Patterns Strategically

Understanding agency buying patterns is only valuable if you translate that knowledge into action.

Step 1: Choose Your Target Agencies

Do not try to sell to all 10 agencies at once. Select 2-3 target agencies based on:

• Mission alignment: Your capabilities match what the agency buys
• Size match: Your company size aligns with the agency's typical contract values
• Certification leverage: Your socioeconomic certifications align with the agency's small business gaps
• Geographic proximity: You have presence near key agency offices or installations
• Past performance: You have relevant experience in the agency's domain

Step 2: Map Your Capabilities to Agency Needs

For each target agency, create a matrix:

Step 3: Align with the Buying Calendar

Plan your business development activities around each agency's buying rhythm:

• Q1 (Oct-Dec): Attend industry days, meet with OSDBU, submit capability statements. Agencies are planning their annual procurement calendar.
• Q2 (Jan-Mar): Respond to Sources Sought notices, build teaming relationships, position for upcoming solicitations.
• Q3 (Apr-Jun): Prepare proposals, respond to RFPs and RFQs, attend pre-proposal conferences.
• Q4 (Jul-Sep): Submit proposals for year-end awards, respond to urgent RFQs, position for quick-turn opportunities.

Step 4: Monitor Agency Forecasts

Every major agency publishes a procurement forecast listing planned acquisitions for the coming fiscal year. These forecasts include:

• Description of the planned procurement
• Estimated dollar value
• Expected solicitation date
• Set-aside status (small business, 8(a), HUBZone, etc.)
• Contact information for the program office

Check these forecasts quarterly and update your capture plans accordingly.

Step 5: Build Agency-Specific Relationships

Each agency has a different culture and different expectations for contractor relationships:

• DoD: Attend Armed Forces Communications and Electronics Association (AFCEA) events, subscribe to Defense One and Federal News Network
• VA: Engage with the National Veterans Small Business Engagement (NVSBE), work through VA OSDBU
• HHS/NIH: Participate in NIH Research Festival, engage with Small Business Program Coordinators at each Institute
• DHS: Attend Homeland Security Industry Conference (HSIC), work with DHS OSDBU
• NASA: Attend NASA Industry Day events at each center, participate in SBIR workshops

The Q4 Spending Surge: How to Capitalize

The August-September spending surge is the single most important seasonal pattern in federal procurement. Here is how to position for it:

Start Early

By the time September arrives, agencies have already decided what to buy and from whom. The real positioning happens in Q1-Q3. If you are not on the agency's radar by July, you are probably too late for that fiscal year.

Be on Existing Vehicles

Agencies under time pressure in Q4 strongly prefer to use existing contract vehicles (GSA MAS, GWACs, agency IDIQs, BPAs) rather than creating new contracts from scratch. If you hold these vehicles, you are positioned for quick-turn orders.

Respond Fast

Q4 solicitations often have compressed response timelines, sometimes as short as 5-7 days for RFQs. Being able to respond within 48 hours gives you an edge.

Watch for Micro-Purchases and Simplified Acquisitions

Agencies with remaining budget often use micro-purchases (under $10,000) and simplified acquisitions (under $250,000) to obligate funds quickly. These are high-volume, low-dollar opportunities that can build past performance.

Stock Up on Capacity

If you provide IT products or commercial services, ensure your supply chain can handle a September surge. Agencies will move to the next vendor if you cannot deliver quickly.

How Bidovate Helps You Track Agency Buying Patterns

Understanding agency spending patterns at the level of detail covered in this guide requires continuous monitoring of procurement data across multiple sources: SAM.gov, FPDS, USAspending, agency forecast portals, and more. With over 5.5 million records in SAM.gov alone, manual tracking is impractical.

Bidovate's AI-powered platform provides:

• Agency-specific dashboards showing spending trends, contract vehicle usage, and small business performance for every major federal agency
• Opportunity discovery across SAM.gov, FPDS, USAspending, and 1,000+ additional portals, filtered by agency, NAICS code, and set-aside type
• Competitive intelligence revealing who is winning contracts at your target agencies and at what price points
• Forecast tracking that alerts you to planned procurements before solicitations are published
• AI-powered analysis through the Mevin assistant that helps you interpret agency data and develop targeted capture strategies
• The Vault knowledge base for storing agency research, past proposals, and capture plans in one searchable location
• Chrome Extension for instant research while browsing SAM.gov and agency websites

In a $2.2 trillion procurement market with 108,899 competing companies, the contractors who win consistently are the ones who understand their buyers better than the competition. Agency-specific intelligence is not a luxury. It is a competitive necessity.

Book a Demo to see how Bidovate's agency analytics give you a data-driven edge in federal contracting.

Frequently Asked Questions

Which federal agency is the easiest for small businesses to win contracts with?

There is no single "easiest" agency, but some agencies are more small-business-friendly than others. The VA consistently exceeds its small business goals and has the Veterans First Contracting Program that prioritizes SDVOSB and VOSB firms. GSA manages multiple contract vehicles specifically designed for small businesses (8(a) STARS III, VETS 2). NASA has a robust SBIR/STTR program. The key is matching your specific capabilities and certifications to the agency where you have the strongest alignment, not chasing the agency with the largest overall small business spend.

How do I find out what a specific agency plans to buy next year?

Every major federal agency publishes a procurement forecast, usually available on their website or through SAM.gov's Contract Opportunities section. These forecasts list planned acquisitions, estimated values, expected solicitation dates, and set-aside information. Additionally, attend agency industry days and engage with OSDBU offices to get early visibility into planned procurements. Bidovate aggregates forecast data from multiple agencies into a single searchable platform, making it easier to track upcoming opportunities across your target agencies.

What is the Q4 spending surge and how significant is it?

The Q4 spending surge occurs in July through September (the last quarter of the federal fiscal year, which ends September 30). Federal agencies typically obligate 30-40% of their annual contract spending during Q4, with September alone often accounting for 15-20% of total yearly spending. This happens because most appropriated funds expire at the end of the fiscal year under "use it or lose it" rules. For contractors, this creates a surge of opportunities but with compressed timelines. Being on existing contract vehicles (GSA Schedule, GWACs, BPAs) is critical for capturing Q4 spending because agencies prefer quick-ordering methods when time is short.

How does understanding agency buying patterns help me price my proposals?

Agency buying patterns reveal what specific agencies have paid for similar services in the past, which directly informs your pricing strategy. By analyzing FPDS and USAspending data for your target agency, you can see historical contract values for your NAICS codes, understand whether the agency tends toward lowest-price or best-value awards, and identify the price range that wins. Different agencies also have different indirect rate expectations. DoD contractors typically have higher wrap rates (due to clearance premiums and facility costs) than civilian agency contractors. Knowing these norms helps you price competitively for each specific buyer.

Should I pursue contracts with the Department of Defense as a small business?

Yes, but be strategic about it. DoD awards over $100 billion annually to small businesses, making it the largest source of small business contracts by dollar value. However, DoD procurement can be complex, especially for weapons systems and classified work. Start with entry points that are accessible to small businesses: IT services through SEWP or GSA MAS, professional services through OASIS+, base operations support at local installations, or SBIR/STTR for technology companies. Build past performance and relationships at one military service branch before expanding to others. Many small businesses find success starting with DLA (Defense Logistics Agency) supply contracts, which have simpler requirements and faster award timelines.