--- title: "Contract vehicles explained: GWACs, IDIQs, GSA Schedules and BPAs" canonical: "https://teamingindex.com/knowledge/contract-vehicles-gwacs-idiqs" lastReviewed: "2026-11-08" markdown_url: "https://teamingindex.com/knowledge/contract-vehicles-gwacs-idiqs.md" topic: "Contract vehicles" summary: "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." --- # 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. - Topic: Contract vehicles - Last reviewed: 2026-11-08 - Canonical URL: https://teamingindex.com/knowledge/contract-vehicles-gwacs-idiqs 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 | Vehicle | What it is | Rules | | --- | --- | --- | | 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 IDIQ | The same requirement awarded to several companies, which then compete for individual orders, such as GSA's OASIS+ for professional services | FAR 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 SEWP | FAR 2.101 | | MAC (multi-agency contract) | A task or delivery order contract that one agency establishes for use by other agencies under the Economy Act | FAR 2.101 | | GSA Multiple Award Schedule | Long-term contracts with pre-negotiated pricing for commercial products and services, ordered by agencies under FAR Subpart 8.4 | FAR 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 Schedule | FAR 13.303 and 8.405-3 | | Agency-specific IDIQ | A multiple-award vehicle for one agency's mission, such as the Navy's SeaPort-NxG or the Army's ITES-3S | FAR Subpart 16.5 | Other Transaction agreements and consortia work differently again: see [Other Transaction agreements](https://teamingindex.com/knowledge/other-transaction-authority-otas). ## 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](https://teamingindex.com/knowledge/teaming-agreements-vs-joint-ventures)). - **Position for the recompete** of the vehicle itself, or of large orders under it (see [positioning for recompetes](https://teamingindex.com/knowledge/positioning-for-recompetes)). ## Vehicle evaluation checklist - [ ] Does the scope fit your NAICS and product or service codes, and which pools or lanes apply? - [ ] How much have agencies actually obligated through it in your scope, and which agencies use it? - [ ] How much ordering period remains, and is an on-ramp or recompete planned? - [ ] Are there small business pools or set-aside orders, and do you qualify for them? - [ ] Who holds it, and who wins the orders you want? - [ ] What does the vehicle require of holders: reporting, fees, minimum sales, CMMC or clearances? - [ ] What would a seat cost to win and maintain compared with partnering with a holder? ## 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](https://teamingindex.com/vehicles) 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](https://teamingindex.com/directory?vehicle=oasis-plus.prime). - Add your own vehicle holdings under [your vehicles](https://teamingindex.com/dashboard/vehicles) so primes can find you for set-aside and specialty orders. - The [Recompete Radar](https://teamingindex.com/recompete) shows expiring contracts and orders 6 to 18 months ahead, so you can plan around vehicle recompetes. ## Official sources - [FAR Subpart 16.5: Indefinite-Delivery Contracts](https://www.acquisition.gov/far/subpart-16.5) - [FAR Subpart 8.4: Federal Supply Schedules](https://www.acquisition.gov/far/subpart-8.4) - [FAR 2.101: Definitions (GWAC, multi-agency contract)](https://www.acquisition.gov/far/2.101) - [FAR 13.303: Blanket purchase agreements](https://www.acquisition.gov/far/13.303) - [GSA: Multiple Award Schedule](https://www.gsa.gov/buy-through-us/purchasing-programs/multiple-award-schedule) - [USAspending.gov: award and spending data](https://www.usaspending.gov/) 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.