25.2 Contract Types and Cost Risk Allocation

Key Takeaways

  • Competitive procurement methods are categorized by dollar threshold and complexity: Micro-purchases, Small Purchase Procedures (simplified acquisition), Sealed Bidding (Invitation for Bids [IFB] awarded to lowest responsive/responsible bidder without negotiations), Competitive Proposals (Request for Proposals [RFP] evaluated on best-value trade-offs), and strictly justified Sole Source exceptions.
  • Public purchasing efficiencies—such as purchasing cards (P-Cards), cooperative purchasing (piggybacking), Multi-Agency Contracts (MACs), and GSA Federal Supply Schedules—streamline acquisitions while demanding rigorous internal controls to prevent transaction splitting and unauthorized commitments.
  • Contract administration encompasses formal performance monitoring by the Contracting Officer's Representative (COR), bilateral vs. unilateral contract modifications, inspection, formal acceptance, dispute resolution under the Contract Disputes Act, and closeout.
Last updated: September 2026

Contract Types and Cost Risk Allocation

The choice of contract type is a pivotal financial decision that governs how financial cost risk is distributed between the government and the commercial contractor.

+---------------------------------------------------------------------------------------------------+
|                         CONTRACT TYPE SPECTRUM & COST RISK ALLOCATION                             |
+---------------------------------------------------------------------------------------------------+
|                                                                                                   |
|  CONTRACTOR BEARS 100% COST RISK <============================> GOVERNMENT BEARS 100% COST RISK  |
|                                                                                                   |
|  [Firm Fixed-Price] ---> [Fixed-Price EPA] ---> [Incentive] ---> [T&M / LH] ---> [Cost-Plus-Fee]   |
|                                                                                                   |
|  • Maximum contractor incentive to control costs               • Maximum government risk         |
|  • Minimal government administrative monitoring                 • Requires certified contractor   |
|  • Well-defined, predictable specifications                       accounting system & audit trail |
|                                                                                                   |
+---------------------------------------------------------------------------------------------------+

Fixed-Price Contract Vehicles

  • Firm Fixed-Price (FFP): The government pays an agreed-upon, non-negotiable lump-sum or fixed unit price regardless of the contractor's actual incurred costs of performance. The contractor absorbs 100% of any cost overruns resulting from labor inflation, material shortages, or operational inefficiencies, but retains 100% of any cost savings as commercial profit. FFP places maximum cost risk on the contractor and represents the preferred public contracting mechanism.
  • Fixed-Price with Economic Price Adjustment (FP-EPA): A fixed-price contract that provides for upward or downward revisions of the stated contract price upon the occurrence of specified economic contingencies beyond the contractor's control (e.g., documented fluctuations in established national labor indices, published commodity indexes for steel or asphalt, or fuel benchmarks). FP-EPA protects both the contractor and the government against catastrophic market volatility in multi-year capital contracts.

Cost-Reimbursement Contract Vehicles

Cost-reimbursement contracts provide for payment of allowable, allocable, and reasonable incurred costs to the contractor, to the extent prescribed in the contract, plus a predetermined fee. They are utilized only when work uncertainties and technical complexities are so substantial that performance costs cannot be estimated with sufficient accuracy to utilize any fixed-price contract.

  • Cost-Plus-Fixed-Fee (CPFF): The contractor is reimbursed for allowable costs and receives a negotiated fixed fee that remains static regardless of actual performance costs. While the contractor does not earn additional fee if costs escalate, the government bears 100% of allowable cost overruns up to the statutory ceiling.
  • Mandatory Legal Pre-conditions: Under the FAR and state procurement rules, a cost-reimbursement contract may be awarded only if:
    1. A formal written determination and findings documents that no fixed-price contract is feasible;
    2. The contractor possesses an adequate, approved cost accounting system capable of accurately segregating direct and indirect costs in compliance with Cost Accounting Standards (CAS) and FAR Part 31; and
    3. The agency maintains adequate administrative personnel to conduct continuous cost surveillance and audit invoices.
  • The Absolute Prohibition of Cost-Plus-a-Percentage-of-Cost (CPPC): Under 41 U.S.C. § 3905, FAR Part 16.102, and Uniform Guidance 2 CFR 200.324(d), the cost-plus-a-percentage-of-cost (CPPC) system of contracting is strictly illegal. In a CPPC contract, the contractor's profit increases proportionally as actual costs increase, creating a perverse financial incentive for the contractor to inflate costs, maximize waste, and prolong schedules at public expense.

Time-and-Materials (T&M) and Labor-Hour (LH) Contracts

  • Mechanics: T&M contracts provide for acquiring supplies or services on the basis of: (1) direct labor hours billed at specified fixed hourly rates (which include wages, overhead, general and administrative [G&A] expenses, and contractor profit), and (2) actual direct costs for materials, supplies, and subcontracts. Labor-Hour contracts are identical but exclude materials.
  • Risk Profile: T&M contracts allocate substantial cost risk to the government because they provide no incentive for the contractor to exercise cost control or labor efficiency. Under federal and state procurement regulations, T&M contracts may be used only when no other contract type is suitable.
  • Mandatory Ceiling Price: Every T&M and Labor-Hour contract must contain a mandatory contractual ceiling price that the contractor exceeds at its own peril. The contractor must formally notify the government when billed costs reach 75% to 85% of the ceiling; the government is under no legal obligation to reimburse any costs incurred above the ceiling price unless formally modified in writing.

Procurement Efficiencies and Intergovernmental Vehicles

Public entities employ innovative procurement mechanisms to aggregate purchasing power, eliminate duplicative administrative solicitations, and accelerate acquisitions.

Government Purchase Cards (P-Cards)

Commercial purchasing cards (P-Cards) allow authorized public employees to purchase low-dollar commercial goods and services directly without issuing formal paper purchase orders or executing multi-tier purchase requisitions. Internal controls over P-Card programs include:

  • Single-Transaction Limits and Monthly Spending Caps: Strictly configured credit limits matching employee operational responsibility (e.g., $1,500 single-purchase limit for field technicians; $10,000 for central procurement staff).
  • Merchant Category Code (MCC) Blocking: Automated electronic blocking of merchant codes associated with high-risk commercial vendors (e.g., jewelry stores, liquor outlets, entertainment venues, package stores, cash advance ATMs).
  • Prohibition of Transaction Splitting: Employees are strictly barred from dividing a single procurement of $4,000 into two separate $2,000 P-Card transactions to circumvent single-purchase limits or competitive thresholds.
  • Mandatory Monthly Reconciliation: Zero-tolerance requirement for cardholders to submit itemized receipts and log transactions for independent managerial review and approval prior to accounts payable statement settlement.

Cooperative Purchasing and "Piggybacking"

Cooperative purchasing involves two or more public entities combining their purchasing requirements to leverage volume discounts and eliminate duplicative solicitations:

  • Piggybacking / Joint Contracting: A governmental entity accesses an existing contract competitively procured by another public jurisdiction (e.g., a city purchasing fire engines under a master contract competitively bid and awarded by the state department of transportation or a national purchasing consortium like NASPO ValuePoint, Omnia Partners, or Sourcewell).
  • Legal Requirements: Under public procurement law and Uniform Guidance (2 CFR 200.318(e)), piggybacking is lawful only if: (1) the originating solicitation and resulting contract contained clear statutory language authorizing other public jurisdictions to ride or join the contract; (2) the original solicitation was conducted under full and open competition; and (3) the purchasing entity ensures the pricing, terms, and underlying scope match its specific statutory requirements.

Federal Supply Schedules (GSA Schedules) and Multi-Agency Contracts

  • GSA Multiple Award Schedules (MAS): Long-term government-wide contracts established by the General Services Administration (GSA) with commercial firms, providing federal agencies (and state/local entities under programs like Cooperative Purchasing and Disaster Purchasing) streamlined access to millions of commercial products and services at negotiated, volume-discounted prices.
  • Multi-Agency Contracts (MACs) and GWACs: Government-Wide Acquisition Contracts (GWACs) are task-order Indefinite Delivery/Indefinite Quantity (IDIQ) contracts for information technology established by one executive "lead" agency for government-wide use. Individual agencies issue competitive task orders against pre-qualified schedule holders, drastically compressing procurement timelines from months to days.

Contract Administration: Post-Award Governance and Closeout

Awarding a contract marks the beginning, not the end, of the procurement lifecycle. Contract administration ensures that the government receives the contracted supplies, construction, or services in full compliance with quality specifications, delivery schedules, and agreed pricing.

Roles: Contracting Officer (CO) vs. Contracting Officer's Representative (COR)

Strict institutional separation governs contract oversight:

  • Contracting Officer (CO / KO): The designated government official possessing explicit statutory warrant authority to enter into, administer, legally modify, or terminate contracts. Only the CO has legal authority to obligate government funds or alter contract terms, pricing, or specifications.
  • Contracting Officer's Representative (COR): The designated technical, engineering, or program official appointed in writing by the CO to perform technical surveillance, day-to-day inspection, and operational monitoring of contractor performance. The COR holds no legal authority to alter contract requirements, approve price increases, or authorize scope expansions. Any informal directive issued by a COR that changes the contract scope is legally unauthorized.

Contract Modifications: Bilateral vs. Unilateral and Constructive Changes

  • Bilateral Modifications (Supplemental Agreements): Signed by both the Contracting Officer and the authorized contractor representative. Used to negotiate equitable price adjustments, expand project scope, alter delivery terms, or execute mutual contract renewals.
  • Unilateral Modifications: Signed solely by the Contracting Officer. Authorized only for administrative changes (e.g., updating paying office codes), issuing unilateral notices of termination, exercising priced contract options, or issuing formal change orders pursuant to the contract's standard "Changes" clause.
  • Constructive Changes: Occurs when government personnel—through informal verbal instructions, ambiguous written commentary, or premature work rejections—compel the contractor to perform work outside the explicit contract terms without a formal written change order. Constructive changes represent a major administrative vulnerability, exposing the government to substantial contractor claims for equitable adjustment.

Inspection, Testing, and Formal Acceptance

  • Right of Inspection: The government maintains an inherent statutory right to inspect and test all supplies, services, and construction before acceptance. Work failing to conform to specifications may be rejected or required to be corrected at the contractor's sole expense.
  • Formal Acceptance: Acceptance constitutes the official written acknowledgement by the authorized government representative that supplies or services conform to contract quality and quantity requirements. Once formal acceptance occurs, custody and title pass to the government, triggering payment obligations under prompt payment rules and barring subsequent rejection for patent (readily observable) defects (latent defects and fraud remain actionable).

Contract Dispute Resolution: The Contract Disputes Act

Disputes between contractors and public entities are governed by formal administrative procedures designed to avoid disruptive civil litigation:

  • The Contract Disputes Act of 1978 (CDA) (41 U.S.C. § 7101 et seq.): Establishes uniform statutory procedures for resolving claims arising under federal contracts. All contractor claims against the government exceeding $100,000 must be formally certified under penalty of law by an authorized contractor official as submitted in good faith with accurate supporting data.
  • Contracting Officer's Final Decision (COFD): The CO must review the claim and issue a formal written final decision within 60 calendar days (or provide a firm date by which a decision will be rendered).
  • Appeals Channels: If the contractor disputes the COFD, it may appeal to either: (1) an administrative Board of Contract Appeals (e.g., Civilian Board of Contract Appeals [CBCA] or Armed Services Board of Contract Appeals [ASBCA]) within 90 days; or (2) the United States Court of Federal Claims within 12 months.
  • Alternative Dispute Resolution (ADR): Modern public procurement actively encourages mediation, minitrials, and non-binding neutral evaluation to settle disputes expeditiously without adversarial adjudication.

Contract Closeout

Contract closeout is the final administrative and financial phase that confirms all obligations have been satisfied:

  1. Verification that all physical deliverables have been inspected and formally accepted;
  2. Performance of final invoice audit to resolve indirect rates and disallow non-conforming costs (on cost-reimbursement contracts);
  3. Verification that all government-furnished property (GFP) and tooling have been returned, disposed of, or accounted for;
  4. Resolution of all subcontracts, royalties, and patent releases;
  5. Execution of a comprehensive Contractor's Release of Claims, legally discharging the government from any future financial liabilities;
  6. De-obligation of remaining unexpended obligated fund balances back to the originating appropriation account; and
  7. Formal archiving of the contract file in compliance with public records retention schedules.

Practical Public Finance Scenario: Municipal Fleet Maintenance Procurement Audit

Scenario: The City of Oakridge (population 210,000) recently completed an internal audit of its Central Fleet Services Department, which manages maintenance for 1,200 municipal vehicles. The internal audit team uncovered several significant procurement vulnerabilities:

  1. To acquire $180,000 of specialized diagnostic engine scanners, the fleet manager issued nine separate $20,000 purchase orders over a three-week period to a single local distributor without competitive bidding, citing the city's $25,000 small purchase threshold.
  2. The city issued an Invitation for Bids (IFB) for a three-year bulk motor oil supply contract. The lowest responsive bidder submitted a price of $240,000. However, the Fleet Director negotiated with the second-lowest bidder ($255,000) to match the low bid price because that vendor was located within city boundaries, awarding the contract to the local vendor.
  3. An emergency generator overhaul contract was awarded on a "Time-and-Materials" basis with no stated ceiling price. The vendor's final billed cost was $195,000 against an initial rough estimate of $85,000.
  4. Multiple department supervisors routinely signed "urgent change requests" directing building contractors to expand facility renovations without notifying the City Purchasing Agent.

Audit Findings and Corrective Action Directives

  1. Prohibition of Transaction Splitting:
    • Audit Finding: Intentionally dividing a known $180,000 equipment acquisition into nine $20,000 orders to avoid the $25,000 competitive threshold constitutes transaction splitting, a severe violation of public purchasing law, state statutes, and city ordinances.
    • Corrective Directive: Void remaining unfulfilled orders, immediately rescind decentralized purchasing authority from the fleet manager, and mandate that all requirements exceeding $25,000 be consolidated and competitively solicited through central procurement.
  2. Violation of Sealed Bidding Rules (Post-Opening Negotiations):
    • Audit Finding: In sealed bidding (IFB), post-opening discussions and price matching are strictly prohibited. The contract was legally required to be awarded to the lowest responsive and responsible bidder at $240,000. Negotiating with a higher bidder to match prices subverts full and open competition and exposes the city to bid protest litigation.
    • Corrective Directive: Terminate the improperly awarded contract for convenience and re-award the contract to the true lowest responsive and responsible bidder.
  3. Mandatory Ceilings on Time-and-Materials Contracts:
    • Audit Finding: Issuing a T&M contract without a firm ceiling price violates procurement standards, placing open-ended financial risk upon taxpayers. Under public contracting standards, an un-capped T&M contract is legally defective.
    • Corrective Directive: Require all future emergency T&M contracts to incorporate a mandatory contractual ceiling price that the contractor exceeds at its own financial risk, supported by real-time labor-hour tracking by a certified inspector.
  4. Elimination of Unauthorized Commitments and Constructive Changes:
    • Audit Finding: Department supervisors issuing field change directives without delegated purchasing authority generated unauthorized commitments and constructive changes, exposing the city to unbudgeted liabilities.
    • Corrective Directive: Institute a mandatory city-wide policy establishing that only the City Purchasing Agent holds legal authority to modify contracts. Any unauthorized commitment must undergo formal legal ratification, and employees executing unauthorized directives face administrative sanctions.
Loading diagram...
Public Procurement Method Selection and Contract Administration Lifecycle
Test Your Knowledge

A federal research laboratory requires a specialized, complex environmental testing facility. Because the engineering requirements involve novel acoustic dampening and high technical uncertainty, the project costs cannot be estimated with reasonable accuracy. The contracting officer is considering a cost-reimbursement contract. Which of the following conditions is an absolute statutory prerequisite before awarding this contract type?

A
B
C
D
Test Your Knowledge

An administrative supervisor in a county human services department needs to procure $28,000 of office workstations. The county's small purchase simplified acquisition threshold is $25,000, above which formal advertised competitive bidding is legally required. The supervisor instructs the purchasing clerk to issue two separate purchase orders on consecutive days—one for $14,500 and one for $13,500—to avoid delays associated with formal bidding. How is this transaction classified under public procurement law and internal controls?

A
B
C
D