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Government Contract — Line Item Types

Contract Line Item Numbers (CLINs) are the building blocks of government contracts, defining individual priced items for supplies, services, options, and data deliverables. Each CLIN type carries a distinct pricing structure, risk allocation, and FAR authority.

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12 CLIN typesRefreshed hourly

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Supply & Fixed-Price CLINs

Service & Cost-Reimbursement CLINs

CPFF

Cost-Plus-Fixed-Fee CLIN

A contract line item that reimburses the contractor for all allowable costs incurred in performance plus a fixed fee (profit) negotiated at contract award. The fee does not vary with actual costs, providing some incentive for cost control while protecting the contractor from the uncertainty of undefined or research-oriented work.

serviceFAR 16.306 — Cost-Plus-Fixed-Fee Contracts
CPIF

Cost-Plus-Incentive-Fee CLIN

A contract line item that reimburses the contractor for allowable costs plus a fee that is adjusted by a formula based on the relationship of total allowable costs to target cost. The fee adjustment formula provides a positive or negative incentive for the contractor to manage costs effectively, sharing cost overruns and underruns between the government and contractor.

serviceFAR 16.405-1 — Cost-Plus-Incentive-Fee Contracts
T&M

Time-and-Materials CLIN

A contract line item that pays the contractor based on fixed hourly labor rates (which include wages, overhead, G&A, and profit) plus actual cost of materials. T&M CLINs are used when it is impossible to estimate the extent or duration of work or to anticipate costs with any reasonable degree of confidence at the time of contract award.

serviceFAR 16.601 — Time-and-Materials Contracts
LH

Labor Hour CLIN

A variation of the time-and-materials contract line item that covers only labor hours at fixed hourly rates, with no provision for materials. The contractor provides only labor services, and all materials, equipment, and facilities are government-furnished. Labor hour CLINs are subject to the same D&F requirements as T&M contracts.

serviceFAR 16.602 — Labor-Hour Contracts

Option CLINs

Data CLINs

Special Purpose CLINs

TRVL

Travel CLIN

A contract line item that covers the cost of travel required for contract performance, typically reimbursed at actual cost in accordance with the Joint Travel Regulations (JTR) or Federal Travel Regulation (FTR). Travel CLINs separate travel costs from labor and material costs, providing visibility into travel spending and enabling the government to control travel scope.

specialFAR 31.205-46 — Travel Costs
ODC

Other Direct Costs CLIN

A contract line item for direct costs that do not fall into standard labor or material categories, such as equipment purchases, software licenses, shipping, printing, and specialized testing. ODC CLINs capture miscellaneous direct costs that are necessary for contract performance but are difficult to estimate precisely at the time of award.

specialFAR 31.202 — Direct Costs
AF

Award Fee CLIN

A contract line item where a portion of the contractor's fee is determined by the government's subjective evaluation of performance against predetermined criteria. An Award Fee Determination Board periodically assesses contractor performance and recommends fee amounts within a range from zero to the maximum award fee. This provides a powerful incentive for excellence.

specialFAR 16.405-2 — Cost-Plus-Award-Fee Contracts
IF

Incentive Fee CLIN

A contract line item where the contractor's fee is adjusted based on achievement of objectively measurable performance targets in areas such as cost, schedule, and technical performance. Unlike award fee (which is subjective), incentive fee is calculated by predetermined formulas tied to specific metrics, providing transparent and predictable performance incentives.

specialFAR 16.402 — Application of Predetermined, Formula-Type Incentives

About Contract Line Items

Contract Line Item Numbers (CLINs) organize government contracts into discrete, separately priced units that can be individually tracked, funded, and administered. Each CLIN specifies a pricing arrangement — from firm-fixed-price to cost-reimbursement to time-and-materials — that determines how risk is allocated between the government and contractor.

Understanding CLIN types is essential for proposal pricing, contract administration, and financial management. The choice of CLIN pricing structure affects profit potential, audit exposure, billing procedures, and the level of cost accounting system sophistication required. Most government contracts use a mix of CLIN types to address different elements of the work.