Six Essential Tips for Complying with FAR Cost Principles


In honor of the release of the 6th Edition of the Government Contracts Compliance Handbook, we are sharing six essential tips for government contractors to ensure compliance with the Federal Acquisition Regulation (FAR) cost principles. For contractors doing business with the federal government, understanding cost allowability is critical to maintaining compliance and avoiding costly disputes, penalties, or even allegations of fraud. The FAR cost principles dictate what expenses are reimbursable under government contracts and impose strict accounting and certification requirements. These six tips will help contractors navigate this complex regulatory environment while mitigating risk.  

1. Understand the FAR Cost Principles and Their Scope

FAR Part 31, commonly referred to as the “cost principles,” governs which costs are allowable, unallowable, or subject to limitations when billing the government. These rules apply to:   

– Cost-reimbursement contracts (e.g., cost-plus-fixed-fee contracts)   

– Negotiated contracts requiring cost analysis   

– Termination settlements   

– Pricing changes, redeterminations, and other contract modifications   

The cost principles ensure that only reasonable, allocable, and allowable costs are reimbursed. However, exceptions exist, particularly in commercial contracts, where FAR cost principles generally do not apply. Contractors must first determine if their contract falls under FAR Part 31 before applying these rules.   

2. Ensure Costs Meet the Five-Part Test for Allowability

For a cost to be allowable under FAR Part 31, it must meet five key criteria:   

i. Reasonableness – The cost must be one a prudent business would incur under similar circumstances. Costs that seem excessive, wasteful, or beyond industry norms may be challenged.   

ii. Allocability – The cost must directly benefit the contract or reasonably relate to the contractor’s overall operations. Costs benefiting multiple contracts should be proportionately allocated.   

iii. Accounting Standards – The cost must conform to Cost Accounting Standards (CAS) (if applicable) or Generally Accepted Accounting Principles (GAAP).   

iv. Contract Terms – The cost must comply with specific contract provisions, which may impose additional restrictions beyond the FAR cost principles.   

v. FAR Subpart 31.2 Limitations – Certain costs are expressly unallowable under FAR Part 31, such as lobbying expenses, alcohol, and bad debts.   

Understanding and applying these five criteria consistently can help prevent audit findings and disputes with contracting officers. 

3. Identify and Avoid Unallowable Costs

FAR Part 31.205 identifies specific costs that are either expressly unallowable or subject to limitations. Some of the most commonly challenged costs include:   

– Entertainment, gifts, and alcoholic beverages   

– Lobbying and political activity expenses 

– Fines, penalties, and legal costs associated with government enforcement actions 

– Bad debts and losses on other contracts 

– Unreasonable executive compensation exceeding statutory limits 

The government imposes strict penalties on contractors who attempt to charge unallowable costs. The Penalties for Unallowable Costs Clause (FAR 42.709) allows contracting officers to impose double penalties if a contractor knowingly includes unallowable costs in an indirect cost rate proposal.   

To prevent such issues, contractors should:   

– Maintain detailed cost segregation in their accounting systems.   

– Establish internal controls to review costs before submission.   

– Conduct regular training for employees involved in cost reporting and accounting.   

4. Implement a Strong Indirect Cost Accounting System

Indirect costs—such as overhead and general & administrative (G&A) expenses—must be properly classified and allocated to contracts in accordance with CAS 405 and FAR Part 31. Contractors should:   

– Segregate unallowable costs to prevent them from being included in indirect cost pools.   

– Use appropriate cost allocation bases, ensuring costs are distributed equitably among contracts that benefit.   

– Follow written accounting policies that comply with FAR and CAS requirements.   

– Monitor changes in business practices, such as corporate reorganizations, that might impact cost allowability or allocation.   

Failing to properly allocate costs can result in disputes, disallowed costs, and significant financial liability during government audits.   

5. Certify Indirect Cost Proposals with Caution

Government contractors must certify their final indirect cost proposals using the Certificate of Final Indirect Costs, which affirms that all costs submitted are:   

– Allowable under FAR cost principles   

– Correctly allocated   

– Free of expressly unallowable costs 

This certification carries legal risks—if a contractor knowingly includes unallowable costs in their indirect cost proposal, they may face penalties under the False Claims Act (FCA) or be referred for criminal investigation.   

To minimize liability:   

– Conduct internal audits before submission.   

– Use statistical sampling techniques (if permitted by the contracting officer) to review cost pools.   

– Seek legal counsel if uncertain about cost allowability before signing the certification.   

6. Respond Proactively to Cost Disallowance and Audit Findings

If a contracting officer disallows a cost, contractors have the right to:   

– Respond in writing with supporting documentation.   

– Appeal the decision under the Contract Disputes Act (CDA) if they believe the cost was improperly disallowed.   

– Negotiate with the government to resolve disputes before they escalate.   

The Defense Contract Audit Agency (DCAA) and other government auditors frequently review contractors’ cost records. A proactive compliance approach—including regular internal audits, cost documentation best practices, and early engagement with government auditors—can reduce the risk of findings and ensure smooth contract performance.   

Complying with FAR cost principles is a fundamental requirement for government contractors. Failing to follow these rules can lead to cost disallowances, financial penalties, and potential legal liability. By implementing these six essential tips, contractors can improve compliance, mitigate risk, and strengthen their government contracting business.   

These insights, drawn from the 6th Edition of the Government Contracts Compliance Handbook, reflect our firm’s commitment to providing timely legal guidance to contractors navigating the complexities of government cost regulations. For tailored assistance in FAR compliance, cost allowability disputes, or government audits, our elite government contracts practice group is here to help. 



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Six Essential Tips for Complying with FAR Cost Accounting Standards (CAS)


In honor of the release of the 6th Edition of the Government Contracts Compliance Handbook, we are sharing six essential tips for complying with the Cost Accounting Standards (CAS). CAS compliance is critical for government contractors who enter into contracts subject to these complex requirements. Failure to comply can lead to severe consequences, including cost disallowances, contract price adjustments, penalties under the False Claims Act, and potential suspension or debarment from future government contracts. These six tips will help contractors navigate CAS regulations effectively while mitigating compliance risks.  

1. Determine if CAS Applies to Your Contracts

The first step in CAS compliance is determining whether your contracts fall under full CAS coverage, modified CAS coverage, or exemptions. CAS applies to most negotiated contracts over $2 million unless an exemption applies, such as:   

– Sealed bid contracts   

– Contracts below the Truthful Cost or Pricing Data statute (formerly TINA) threshold ($2 million)   

– Contracts with small businesses   

– Commercial item contracts   

– Firm-fixed-price contracts awarded based on adequate price competition without the submission of certified cost or pricing data   

If your company receives a single CAS-covered contract of $50 million or more, you will be subject to full CAS coverage, meaning you must comply with all 19 CAS standards. If your CAS-covered contracts are below $50 million, you may qualify for modified CAS coverage, requiring compliance with only four standards:   

    1. CAS 401 – Consistency in estimating, accumulating, and reporting costs  
    2. CAS 402 – Consistency in allocating costs for the same purpose  
    3. CAS 405 – Accounting for unallowable costs  
    4. CAS 406 – Use of a consistent cost accounting period  

Understanding your CAS obligations is critical to structuring your accounting systems properly from the outset.  

2. Submit and Maintain an Accurate CAS Disclosure Statement  

Government contractors subject to full CAS coverage must submit a CAS Disclosure Statement (Form CASB DS-1), which provides a detailed explanation of the contractor’s cost accounting practices. This document must be:   

– Accurate and complete – Any errors, omissions, or misrepresentations can lead to penalties under the False Statements Act (18 U.S.C. § 1001).   

– Consistently followed – The government expects contractors to apply their disclosed cost accounting practices uniformly across all contracts.   

– Updated when changes occur – Contractors must amend their Disclosure Statements whenever they change their cost accounting practices.   

Failure to properly disclose cost accounting practices can result in disputes, contract price adjustments, and liability under fraud statutes.  

3. Ensure Cost Accounting Practices Are Consistent and Compliant

CAS requires contractors to maintain consistency in their cost accounting practices to ensure fairness in cost allocation. Common CAS standards that focus on consistency include:   

– CAS 401 (Estimating, Accumulating, and Reporting Costs) – Requires contractors to use the same cost accounting practices for estimating contract prices and accumulating actual costs.   

– CAS 402 (Consistency in Allocating Costs) – Prohibits contractors from charging a cost as direct on one contract while treating similar costs as indirect on another.   

– CAS 405 (Accounting for Unallowable Costs) – Requires that expressly unallowable costs (e.g., lobbying, fines, entertainment) be segregated from allowable costs and not included in government billings.   

Contractors should establish internal reviews and audits to ensure their cost accounting practices remain consistent and CAS-compliant.  

4. Develop Internal Controls and Employee Training Programs  

Given the complexity of CAS, contractors must implement strong internal controls and ensure that key personnel—such as finance, accounting, and contract managers—are well-trained in compliance obligations. Best practices include:   

– Creating a formal CAS compliance program – This includes written policies and procedures that clearly define how cost accounting standards will be followed.   

– Providing CAS-specific training – Employees involved in cost reporting, proposal preparation, and accounting should receive regular training on CAS requirements and government expectations.   

– Conducting internal CAS audits – Periodic audits help identify discrepancies before they become compliance issues during a Defense Contract Audit Agency (DCAA) review.   

Well-documented internal controls and training programs can demonstrate good-faith efforts to comply with CAS, which may mitigate penalties in the event of a government audit.  

5. Manage Changes to Cost Accounting Practices Carefully

Contractors must notify the government of any changes to their cost accounting practices and analyze the impact of such changes on government contracts. Key considerations include:   

– CAS 406 (Consistency in Cost Accounting Periods) – Contractors must ensure that changes in cost allocation methodologies do not unfairly shift costs to the government.   

– Notification and cost impact analysis – Contractors must notify the Cognizant Federal Agency Official (CFAO) of changes and submit a cost impact proposal detailing any increase or decrease in government costs.   

– Equitable Adjustments – If a change results in increased costs to the government, an equitable adjustment may be required to ensure compliance.   

Failing to properly disclose and manage accounting changes can result in cost disallowances, disputes, and liability under the False Claims Act.  

6. Be Prepared for Government Audits and Investigations

Government auditors, particularly the DCAA, closely scrutinize CAS compliance. To prepare for audits:   

– Maintain detailed records – Ensure all financial and cost accounting documentation is readily available for review.   

– Regularly test compliance – Conduct mock audits or hire external consultants to assess compliance gaps.   

– Respond promptly to audit findings – If a government auditor identifies potential CAS violations, contractors should work proactively with the CFAO to resolve issues before they escalate.   

The consequences of noncompliance can be severe, including contract price reductions, penalties, and even suspension or debarment from future government contracts.   

Complying with the CAS is essential for government contractors to avoid penalties, maintain eligibility for federal contracts, and ensure financial integrity. By following these six essential tips, contractors can strengthen their compliance programs, minimize risks, and maintain positive relationships with government agencies.   

 These insights, drawn from the 6th Edition of the Government Contracts Compliance Handbook, reflect our firm’s commitment to helping contractors navigate the complex regulatory landscape of government contracting. For tailored legal guidance on CAS compliance, cost audits, or contract disputes, our elite government contracts practice group is ready to assist. 



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