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Contract vehicles explained: GWACs, IDIQs, GSA Schedules and BPAs

How IDIQs, GWACs, multi-agency contracts, the GSA Multiple Award Schedule and BPAs work under FAR Parts 8, 13 and 16, how orders are competed, and how to win work when you are not on the vehicle.

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A large share of federal spending does not flow through one-off contracts. Agencies set up contract vehicles, long-term contracts with pre-qualified companies, and then buy through orders placed against them. If your target work flows through a vehicle you do not hold, you can only reach it as a subcontractor or partner of someone who does. Knowing how each type of vehicle works tells you where to invest: in winning a seat, in partners who hold one, or in direct competitions.

The main types of vehicles

VehicleWhat it isRules
IDIQ (indefinite-delivery, indefinite-quantity)A contract for an indefinite quantity of supplies or services, within a stated minimum and maximum, over a fixed period; the Government places task orders (services) or delivery orders (supplies)FAR Subpart 16.5
Multiple-award IDIQThe same requirement awarded to several companies, which then compete for individual orders, such as GSA's OASIS+ for professional servicesFAR 16.504 and 16.505
GWAC (Government-wide acquisition contract)An IT contract that one agency establishes for Government-wide use under OMB designation, such as GSA's Alliant and 8(a) STARS or NASA SEWPFAR 2.101
MAC (multi-agency contract)A task or delivery order contract that one agency establishes for use by other agencies under the Economy ActFAR 2.101
GSA Multiple Award ScheduleLong-term contracts with pre-negotiated pricing for commercial products and services, ordered by agencies under FAR Subpart 8.4FAR Subpart 8.4
BPA (blanket purchase agreement)A simplified "charge account" with qualified sources for repetitive needs, set up on its own or under a GSA ScheduleFAR 13.303 and 8.405-3
Agency-specific IDIQA multiple-award vehicle for one agency's mission, such as the Navy's SeaPort-NxG or the Army's ITES-3SFAR Subpart 16.5

Other Transaction agreements and consortia work differently again: see Other Transaction agreements.

How orders are competed

On a multiple-award IDIQ, the contracting officer must generally give every awardee a fair opportunity to be considered for each order above the micro-purchase threshold (FAR 16.505(b)). The FAR lists limited exceptions, such as urgency, a logical follow-on to an order already competed, only one capable source, or orders needed to satisfy a minimum guarantee. Agencies can also set orders aside for small businesses among the small awardees. Ordering procedures are usually streamlined compared with a full FAR Part 15 competition, and protest rights on orders are restricted (FAR 16.505(a)(10)).

GSA Schedule orders follow FAR 8.405 instead, with procedures that scale with the order's value. Schedule holders can also form contractor team arrangements, in which two or more schedule holders combine their offerings to meet a single agency need.

A vehicle is a hunting license

Winning a seat on an IDIQ rarely guarantees much revenue: the minimum guarantee can be small, and the ceiling is a maximum, not a forecast. What matters is how much agencies actually order through the vehicle, in your scope, and how often holders like you win those orders. Before you spend months on a vehicle proposal, check the obligations on comparable vehicles on USAspending.gov.

Tip: The ceiling you see in press releases is shared by every awardee across the whole ordering period. Divide by the number of holders and the years remaining, then compare with actual obligations, before you build a business case.

Getting work when you are not on the vehicle

  • Subcontract to holders. Primes on multiple-award vehicles need partners with specific capabilities, clearances, CMMC status or small business status for set-aside orders.
  • Join a contractor team arrangement on the GSA Schedule if you hold your own schedule contract.
  • Watch for on-ramps. Some vehicles periodically add awardees; others stay closed until they are recompeted.
  • Form a joint venture to compete for the next round of a small business vehicle (see teaming agreements versus joint ventures).
  • Position for the recompete of the vehicle itself, or of large orders under it (see positioning for recompetes).

Vehicle evaluation checklist

Checklist: tick items as you go (saved in this browser only)

Common pitfalls

  • Treating an award as revenue. A seat with no business development behind it produces nothing.
  • Chasing every vehicle. Proposal costs add up; pick the vehicles your customers actually use.
  • Ignoring the role. Holding a vehicle as a prime is different from supporting a holder as a subcontractor. Say which one you have.
  • Missing order-level requirements. Orders can add CMMC levels, clearances or key personnel the base contract did not require.

How TeamingIndex helps

  • The vehicle catalog lists vehicles with their holders and each holder's role: prime, subcontractor, joint venture or mentor-protégé.
  • Filter partners by vehicle and role, for example OASIS+ prime contract holders.
  • Add your own vehicle holdings under your vehicles so primes can find you for set-aside and specialty orders.
  • The Recompete Radar shows expiring contracts and orders 6 to 18 months ahead, so you can plan around vehicle recompetes.

Not legal advice. TeamingIndex guides are general information to help you plan, not legal advice. Regulations, clauses and program rules change and solicitations can tailor them: always work from the current regulation and the clauses in your solicitation, and confirm decisions with your contracting officer or counsel.

Official sources

Primary regulations and program pages this guide was checked against on . Read them for the authoritative text.

  1. FAR Subpart 16.5: Indefinite-Delivery Contractsacquisition.gov(opens in a new tab)
  2. FAR Subpart 8.4: Federal Supply Schedulesacquisition.gov(opens in a new tab)
  3. FAR 2.101: Definitions (GWAC, multi-agency contract)acquisition.gov(opens in a new tab)
  4. FAR 13.303: Blanket purchase agreementsacquisition.gov(opens in a new tab)
  5. GSA: Multiple Award Schedulegsa.gov(opens in a new tab)
  6. USAspending.gov: award and spending datausaspending.gov(opens in a new tab)

Next step

Put this guide to work

See who holds each vehicle and in what role, then find partners who can take you into the orders you want.