A lot of federal spending does not flow through stand-alone contracts. It flows through indefinite-delivery contracts — often called IDIQs — where the government awards a base contract to one or more companies and then buys through individual orders. Understanding IDIQs explains why some opportunities never appear publicly, and how to get access to them.
The basics
FAR subpart 16.5 describes three types of indefinite-delivery contracts: definite-quantity, requirements and indefinite-quantity. An indefinite-quantity contract provides for an indefinite quantity, within stated limits, of supplies or services during a fixed period. The government must order at least a stated minimum, and the contractor must furnish any additional quantities ordered up to the stated maximum.
- Task orders buy services.
- Delivery orders buy supplies.
Under FAR 16.505(a)(2), each order must clearly describe the work so its full price can be established, and orders must be within the contract's scope, period of performance and maximum value.
Single-award vs multiple-award IDIQs
A single-award IDIQ goes to one contractor, which receives all orders. A multiple-award IDIQ goes to several contractors, who then compete among themselves for orders. The FAR generally expresses a preference for multiple awards when appropriate. Multiple-award vehicles range from a single agency's regional contract to large governmentwide acquisition contracts (GWACs) and multi-agency contracts that any agency can use. The GSA Multiple Award Schedule works in a similar way (see GSA Schedule explained).
Fair opportunity
For multiple-award contracts, FAR 16.505(b)(1) requires the contracting officer to give each awardee a fair opportunity to be considered for each order above the micro-purchase threshold, subject to listed exceptions. The contract itself states the procedures for selecting orders. Orders are generally not synopsized publicly (FAR 16.505(a)(1)), which is why many opportunities are visible only to contract holders.
Order competitions are often faster and lighter than full contract competitions — sometimes a short written response, an oral presentation or a price — but they can be intense because every competitor already passed the base contract evaluation.
Small businesses and IDIQs
- Set-aside IDIQs. Agencies award many IDIQs set aside for small businesses or specific SBA programs. Some larger vehicles have separate small business pools.
- Set-aside orders. Contracting officers may set aside orders under multiple-award contracts for small business holders, subject to the FAR's rules.
- Minimums matter. Winning an IDIQ often guarantees only the stated minimum. The real value comes from winning orders.
- On-ramps. Some multiple-award contracts periodically add new contractors through "on-ramp" solicitations. Watch for them on SAM.gov.
- Teaming. If you do not hold a vehicle, you can still work on orders as a subcontractor to a holder. See subcontracting to prime contractors.
Is it worth bidding on an IDIQ?
Ask the same go/no-go questions as any bid, plus:
- How much has historically been ordered through this vehicle or its predecessor? Award data on USAspending.gov can show obligations on existing vehicles.
- How many awardees will there be, and how many are likely to compete for each order?
- Do you have the business development capacity to chase orders once you hold the contract?
- What does it cost to stay on the vehicle — reporting, fees, compliance?
Protests and orders
Protest rights are narrower for orders than for contracts. Under FAR 16.505(a)(10), protests of orders under task-order or delivery-order contracts are generally not allowed, except where the order increases the scope, period or maximum value of the contract, or where the order exceeds statutory dollar thresholds — and those larger order protests may only be filed with GAO. See bid protest basics.
How order competitions usually work
Each multiple-award contract sets its own fair opportunity procedures, so read the base contract's ordering section carefully. Common patterns include a short request for task order proposals sent to all holders, a brief written technical response with a price, an oral presentation or technical challenge, or price alone for well-defined work. Response times are often shorter than for a new contract, which favors holders who keep résumés, past performance write-ups and pricing models ready.
Keeping track of your vehicles
If you hold more than one indefinite-delivery contract, keep a simple register: contract number, ordering period, minimum and maximum, the agencies allowed to order, your labor categories and rates, reporting obligations, and the contracting officer. Ordering periods expire, ceilings fill up, and reporting deadlines are easy to miss when you only touch a vehicle occasionally.
Vocabulary you will see
- Ordering period — the window during which orders can be placed.
- Ceiling — the contract's maximum value or quantity across all orders.
- Pool — a group of awardees on a large vehicle, often organized by service type or small business status.
- Fair opportunity — the requirement to let each multiple-award holder be considered for orders above the micro-purchase threshold, subject to exceptions.
Frequently asked questions
What does IDIQ stand for?
Indefinite-delivery, indefinite-quantity — a contract that provides for an indefinite quantity of supplies or services, within stated minimum and maximum limits, over a fixed period.
If I win an IDIQ, am I guaranteed work?
Only up to the guaranteed minimum stated in the contract. On multiple-award IDIQs, you must compete for orders.
Why can't I see task order opportunities on SAM.gov?
Orders under indefinite-delivery contracts are generally not publicly synopsized; they are competed among the contract holders under the contract's fair opportunity procedures.
What is an on-ramp?
A process some multiple-award contracts use to add new awardees during the contract's life. Not every vehicle has one.
This guide is general information, not legal advice. Rules change — always check the solicitation and the official sources linked here.