Most government contractors believe the cost proposal is a pricing exercise. It is not. A government contract cost proposal is an accounting exercise with pricing consequences, and that distinction determines whether you win contracts or trigger audit findings.
The confusion makes sense. Commercial proposals start with the price you want to charge and work backward. Federal cost proposals start with your accounting system and work forward. Every direct labor hour, every material purchase, every indirect rate, and every fee dollar must trace back to your books, your policies, and your disclosed practices. The government does not ask what you want to charge. The government asks what the work will cost you, and then it audits your answer.
Contractors who treat cost proposals as pricing documents submit numbers that fall apart under DCAA examination. Contractors who treat them as accounting documents submit numbers they defend with evidence.
The Bottom Line
A government contract cost proposal under FAR 15.408 Table 15-2 requires six cost elements built from your accounting system: direct labor, materials, subcontracts, other direct costs, indirect rates, and fee. Amerifusion Bookkeeping prepares contractor accounting systems to produce these elements with supporting documentation that passes DCAA proposal adequacy review. Contractors who build proposals from their actual cost history, rather than from target prices, win more awards and face fewer audit findings.
What FAR 15.408 Table 15-2 Requires in Your Cost Proposal
FAR 15.408 Table 15-2 prescribes the exact format the government expects for cost and pricing data submissions. This is not a suggestion. Contracting officers use the DCMA Proposal Adequacy Checklist to screen your submission before evaluation even begins. A proposal that fails the adequacy check gets returned, not scored.
Table 15-2 organizes cost data into specific elements. Each element requires a basis of estimate: the explanation of how you arrived at that number and what evidence supports it. The table also requires you to show the relationship between individual line item prices and the total proposed price [FAR 15.408(a)].
| Cost Element | What Table 15-2 Requires | Common Adequacy Failure |
|---|---|---|
| Direct Labor | Labor categories, hours per category, hourly rates, basis for rates | Using “blended” rates with no supporting detail |
| Materials | Consolidated priced summary, quantities, unit prices, sources | Lump-sum material estimates with no vendor quotes |
| Subcontracts | Subcontractor proposals or price analysis for each sub | Missing subcontractor cost breakdowns |
| Other Direct Costs (ODCs) | Travel, equipment, consultants, each itemized with basis | Bundling travel and equipment into a single line |
| Indirect Rates | Fringe, overhead, G&A rates with pool compositions and allocation bases | Using provisional billing rates instead of forward pricing rates |
| Fee/Profit | Proposed fee amount and percentage | Exceeding statutory fee limits for contract type |
The contractor bears the burden of proof for every number in the proposal [FAR 15.404-1(a)]. The contracting officer does not call you to ask for missing support. The proposal either passes adequacy review on submission, or it goes back to you while your competitors move forward.
Building Your Cost Proposal: The 6-Step Process
Each step in the cost volume development process builds on the one before it. Direct costs flow into indirect rate bases, which feed the total cost calculation, which determines the fee. Skip a step or get the sequence wrong, and the math breaks across the entire proposal.
Step 1: Build the Direct Labor Estimate
Start with the statement of work (SOW) or performance work statement (PWS). Identify every labor category the contract requires, the number of hours each category will work, and the hourly rate for each category. Your rates must match actual compensation in your accounting system or reflect documented planned rate adjustments (such as annual raises scheduled for the performance period).
Labor categories in your proposal must align with your chart of accounts labor codes. If your accounting system tracks “Engineer III” and your proposal calls the same role “Senior Systems Engineer,” the auditor will flag the mismatch. Map proposal categories to accounting system categories in a crosswalk table, and include that crosswalk in your supporting documentation.
Calculate total direct labor cost by multiplying hours times rates for each category, then summing across all categories. This total becomes the allocation base for your fringe and overhead rates (in a typical rate structure).
Step 2: Estimate Materials and Subcontracts
List every material item individually. Table 15-2 requires “a consolidated priced summary of individual material quantities” with the basis for pricing. Three acceptable bases exist: vendor quotes (strongest), catalog pricing, or historical purchase data from your accounting system. Lump-sum material lines with no backup fail adequacy review every time.
Subcontracts require their own cost breakdowns. If your subcontractor provides a detailed cost proposal, include it. If the subcontract is for commercial items, provide a price analysis showing the proposed price is fair and reasonable based on competition, catalog pricing, or market research [FAR 15.404-1(b)].
Step 3: Itemize Other Direct Costs
Other direct costs (ODCs) include travel, computer services, consultant fees, special tooling, and any cost charged directly to the contract that is not labor, material, or a subcontract. Each ODC needs its own line item with quantity, unit cost, and basis of estimate.
Travel is the ODC that trips up the most contractors. Break travel into number of trips, airfare per trip, hotel per night, per diem rates (use GSA per diem rates as your basis), and rental car costs. A single “Travel: $45,000” line will not pass adequacy review.
Step 4: Apply Your Indirect Rates
This is where most small contractors make their most expensive mistake. Your proposal must apply forward pricing rates, not provisional billing rates. These are different numbers developed for different purposes under different FAR provisions [FAR 42.704 governs provisional rates; FAR 15.407-3 governs forward pricing rates].
Forward pricing rates project your indirect costs into the future performance period. Provisional billing rates reimburse you during current performance. A contractor billing at a 45% overhead rate today might propose a 42% forward pricing rate for a contract starting next year because of expected growth in the direct labor base.
| Rate Type | Purpose | FAR Reference | Use in Proposals |
|---|---|---|---|
| Forward Pricing Rates | Price future contract work | FAR 15.407-3 | Yes. Required for cost proposals. |
| Provisional Billing Rates | Bill the government during performance | FAR 42.704 | No. DCAA letters explicitly prohibit this use. |
| Final Indirect Cost Rates | Settle costs after fiscal year close | FAR 42.705 | No. Historical rates for closeout only. |
Build your forward pricing rates by projecting your indirect cost pools and allocation bases for the contract’s period of performance. If your current overhead pool is $400,000 on a $1,000,000 direct labor base (40% rate), but you expect to add $300,000 in direct labor next year, your forward pricing overhead rate drops to approximately 31% ($400,000 / $1,300,000). Your indirect rate calculations must reflect anticipated business volume, not current-year actuals.
Apply rates in the correct sequence. For a typical three-pool structure: fringe applies to direct labor, overhead applies to direct labor plus fringe, and G&A applies to total cost input (all direct costs plus fringe and overhead). Getting this sequence wrong cascades errors through every cost element.
Step 5: Calculate Fee
Fee (profit) is the final cost element. Statutory limits apply: 10% for cost-plus-fixed-fee (CPFF) supply contracts, 15% for CPFF R&D and service contracts, 15% for cost-plus-incentive-fee (CPIF) contracts, and 6% for architect-engineer contracts [FAR 15.404-4(c)(4)]. Proposing a fee above the statutory maximum results in automatic rejection, not negotiation.
Calculate fee on total estimated cost (direct costs plus indirect costs plus facilities capital cost of money, if applicable). Do not calculate fee on the total price. The base for fee calculation is cost, not cost-plus-fee.
Step 6: Compile Supporting Documentation
The proposal document itself is the summary. The supporting documentation is what the contracting officer and DCAA auditor actually examine. Missing support is the number one reason proposals fail adequacy review.
Required documentation includes: basis of estimate narratives for each cost element, labor rate justification (payroll records or compensation surveys), vendor quotes or catalog pages for materials, subcontractor proposals, travel calculations with GSA rate references, indirect rate calculations showing pool compositions and allocation bases, and a signed certificate of current cost or pricing data if the proposal exceeds the Truth in Negotiations Act (TINA) threshold of $2 million [FAR 15.403-4].
Five Cost Proposal Mistakes That Trigger DCAA Scrutiny
Contract pricing compliance failures during the proposal stage follow predictable patterns. DCAA auditors and contracting officers flag the same errors across hundreds of small contractor submissions every year. Avoid these five, and your proposal clears the adequacy hurdle most competitors stumble over.
1. Using provisional billing rates as proposal rates. We see this in more than half the small contractors we work with. The DCAA letter establishing your provisional rates explicitly states they “shall not be used for any other purpose” than billing. Use them in a proposal, and you have documented evidence of non-compliance in your own submission.
2. Disconnect between the technical volume and cost volume. Your technical proposal describes a team of eight engineers. Your cost volume prices six. The evaluator notices. This happens when the technical writer and the cost estimator work independently without a reconciliation step. Cross-check labor categories, headcounts, and hours between volumes before submission.
3. Lump-sum ODC estimates. “Other Direct Costs: $75,000” is not a cost element. It is a guess. Break every ODC into specific items with quantities, unit costs, and basis of estimate. If you bundled costs because you did not know how to estimate them individually, the evaluator reads that as lack of understanding of the work.
4. Indirect rates that do not match your disclosed practices. If your written accounting policies describe a two-pool rate structure (fringe/overhead plus G&A) but your proposal applies three pools, the auditor questions your CAS consistency under CAS 401. Your proposal rates must reflect the rate structure in your accounting system and disclosed practices.
5. Missing or defective cost or pricing certifications. For proposals over the TINA threshold, the contractor must certify that cost or pricing data are “accurate, complete, and current” as of the date of agreement on price [FAR 15.406-2]. A missing certificate stops the award. A defective certificate (one that certifies data you knew were wrong) triggers a price reduction under the defective pricing clause and potential False Claims Act liability.
The Accounting System Behind the Proposal
A cost proposal is only as credible as the accounting system that produced it. The contracting officer knows this. Before awarding a cost-reimbursable contract, the government evaluates your accounting system adequacy under DFARS 252.242-7006. An adequate system must segregate direct and indirect costs, accumulate costs by contract, identify unallowable costs, and produce timely and reliable financial reports.
Your proposal rates should trace directly to your accounting records. If you propose a fringe rate of 32%, the auditor will pull your actual fringe costs and labor base from your books to verify that 32% reflects your real cost experience. If your books show a 38% fringe rate and you proposed 32% with no explanation, the auditor flags the difference as potential understatement. The explanation matters: planned headcount growth, benefit plan changes, or a new contract that adds direct labor hours all justify a lower forward pricing rate. Document the rationale.
For contractors preparing their first cost proposal, the accounting system setup comes before the proposal effort. Build the chart of accounts structure, establish indirect cost pools, define allocation bases, and accumulate at least one quarter of cost history before proposing rates to the government. Proposing rates without cost history is like filing a tax return without financial records. The numbers exist, but you have no evidence behind them.
Frequently Asked Questions
What is the difference between a cost proposal and a price proposal?
A cost proposal breaks down every cost element (labor, materials, overhead, G&A, fee) with supporting documentation showing how each number was calculated. A price proposal states the total price with less detailed backup. The government requires cost proposals for cost-reimbursable contracts and for any proposal exceeding the $2 million TINA threshold [FAR 15.403-4].
Do I use provisional billing rates or forward pricing rates in my cost proposal?
Use forward pricing rates. Provisional billing rates exist only for interim billing during contract performance under FAR 42.704. Forward pricing rates project your indirect costs into the proposal’s period of performance under FAR 15.407-3. DCAA’s provisional rate letters explicitly prohibit using those rates for pricing purposes.
What happens if my cost proposal fails the adequacy checklist?
The contracting officer returns it for correction, and your competitors advance. DCMA uses the Proposal Adequacy Checklist (DFARS 252.215-7009) to screen submissions. Common failures include missing subcontractor breakdowns, lump-sum ODC lines without basis of estimate, and absent cost or pricing certifications.
When is certified cost or pricing data required?
Certified cost or pricing data are required when the proposed price exceeds $2 million (the TINA threshold) and no exception applies [FAR 15.403-4]. Exceptions include adequate price competition, prices set by law or regulation, commercial item determinations, and waiver by the head of the contracting activity.
How do I calculate forward pricing indirect rates for a cost proposal?
Project your indirect cost pools (fringe, overhead, G&A) and their allocation bases for the contract’s performance period. Divide each projected pool by its projected base to get the forward rate. Account for planned hiring, anticipated contracts, and expected changes in indirect spending. Document every assumption.
Key Takeaways
- A cost proposal is an accounting document, not a pricing spreadsheet. Every number traces to your accounting system, your cost history, or documented projections supported by evidence. The government audits your answer.
- FAR 15.408 Table 15-2 dictates the format. Six cost elements (direct labor, materials, subcontracts, ODCs, indirect rates, fee) with basis of estimate for each. Proposals that skip the format fail adequacy review before evaluation begins.
- Forward pricing rates and provisional billing rates serve different purposes. Using provisional rates in a proposal is documented non-compliance. Build forward pricing rates by projecting pools and bases into the performance period.
- Your accounting system must exist before your proposal. An adequate system under DFARS 252.242-7006 segregates costs, accumulates by contract, and produces reliable reports. Without it, your proposed rates have no evidentiary foundation.
- Start with an accounting system readiness check to identify gaps before your next proposal deadline. Fixing your rate structure after submission is not an option the contracting officer offers.
Build Your Next Cost Proposal on Solid Accounting
The difference between a winning cost proposal and a returned one is not the price. It is the accounting behind the price. If your indirect rate structure, cost segregation practices, or documentation protocols have gaps, those gaps will surface during proposal adequacy review or DCAA audit.
Run our Compliance Readiness Check to see where your accounting system stands. Ready to prepare for a specific proposal? Review our contract finance services or book a discovery call to discuss your rate structure with a CPA who builds cost proposals for government contractors.
