Indefinite Delivery Definite Quantity Contract (IDDQ)

An Indefinite Delivery Definite Quantity (IDDQ) contract obligates the government to purchase a fixed, predetermined quantity of supplies or services at established prices, with delivery times and locations to be specified through delivery orders issued over the contract period.

What is an IDDQ Contract?

IDDQ is one of three indefinite delivery contract types defined in FAR 16.502, alongside IDIQ and Requirements Contracts. The key distinguishing feature of an IDDQ is that the total quantity is fixed and definite, the government commits to purchasing the stated quantity in full. Only the timing and delivery locations are flexible.

IDDQ characteristics:

• Definite total quantity: the government is obligated to order and pay for the entire stated quantity (unlike IDIQ which has a minimum/maximum range)
• Indefinite delivery: specific delivery schedules and locations are established through delivery orders as needed
• Fixed unit prices: established at contract award for each item
• Full government obligation: the contractor can count on receiving orders for the entire contract quantity
• No maximum ordering ceiling: unlike IDIQ, the total quantity is fixed; the contract ends when all items are ordered

IDDQs are particularly useful when:

• The agency knows exactly how many items it needs over the contract period
• Delivery timing depends on operational needs that cannot be predicted at award
• Multiple delivery locations require flexible scheduling
• The items have a defined shelf life requiring staggered delivery

Why IDDQ matters for government contractors

The definite quantity commitment is IDDQ's biggest advantage over IDIQ from a contractor's perspective. Under an IDIQ, the government is only guaranteed to order the minimum quantity, which may be as low as $1. Under an IDDQ, the contractor is guaranteed the full contract quantity. This certainty allows better production planning, volume purchasing of materials, and more confident staffing decisions. However, IDDQs are less common than IDIQs because agencies often cannot commit to exact quantities in advance, IDIQ's flexibility is generally preferred by program offices.

Example

The Defense Logistics Agency issues an IDDQ contract for 50,000 sets of military body armor over 18 months. The total quantity is firm, DLA is obligated to order all 50,000 sets. Individual delivery orders specify quantities, delivery dates, and destination installations. The contractor sets up production capacity for the full quantity knowing the orders will come. DLA issues delivery orders monthly based on installation inventory levels: 3,000 sets to Fort Bragg in January, 5,000 to Camp Pendleton in February, etc. By month 18, all 50,000 sets have been ordered and delivered.

Frequently Asked Questions

What happens if the government does not order the full quantity under an IDDQ?

Unlike IDIQ contracts (where the government may order only the stated minimum), an IDDQ obligates the government to purchase the full stated quantity. If the government fails to order the full quantity, the contractor may be entitled to damages (lost profit on unordered quantities) through a breach of contract claim or Request for Equitable Adjustment.

How is IDDQ different from a definitive fixed-price supply contract?

A definitive contract for a specified quantity establishes the delivery schedule at award. An IDDQ establishes only the total quantity at award; individual delivery schedules are set through delivery orders. IDDQ provides the agency flexibility in timing and destination while still committing to the full quantity.

Can an IDDQ have multiple option years with additional quantities?

Yes. An IDDQ base period may specify one quantity, with option periods specifying additional quantities the government may (but is not required to) exercise. The options allow quantity flexibility over the contract life while maintaining the guaranteed-quantity character within each exercised period.

Are IDDQs used for services as well as supplies?

IDDQs are more common for supplies with definite quantities (sets of equipment, units of a product) than for services. Services with a definite level of effort (a fixed number of training hours, a defined quantity of consulting days) can use IDDQ structure, but the IDIQ or Requirements Contract structure is more common for services where demand variability exists.