DCAA Indirect Rate Structure: Fringe, Overhead, and G&A Rate Pools Explained

Every government contractor with a cost-type, time-and-materials, or CAS-covered contract has to allocate costs that do not belong to any single contract, things like the controller’s salary, the office lease, or the payroll tax on every employee’s paycheck. The mechanism for doing that is the indirect rate structure: a small set of cost pools, each divided by an allocation base, that turns shared costs into a rate the contractor applies to every contract’s direct costs. Most contractors build three pools (fringe, overhead, and G&A), though the exact structure depends on the business. Get the pool definitions or the allocation base wrong at the start, and every incurred cost submission, every billing, and every audit built on top of that structure inherits the error.

What are the three standard indirect cost pools?

An indirect cost is one that benefits more than one contract, or the business as a whole, so it cannot be charged directly to any single contract under FAR 31.203. The government does not tell a contractor how many pools to run. What it requires, through CAS 418 (allocation of direct and indirect costs) and through DCAA’s own practice, is that the pools be logical, consistently applied, and reconcilable to the general ledger. Three pools has become the near-universal default because it separates costs by how they behave.

• Fringe benefits. Payroll taxes (FICA, FUTA, SUTA), health and dental insurance, retirement contributions, workers’ compensation, and paid time off. Fringe tracks with headcount and payroll, so it is usually allocated over total labor dollars (direct plus indirect) or, less commonly, total labor hours.
• Overhead. Costs that support the people doing the direct work but are not identifiable to a single contract: indirect labor (supervisors, quality control, facility staff), facility rent and utilities, equipment depreciation, small tools, and IT support tied to production. Overhead is almost always allocated over direct labor dollars, because direct labor is the activity overhead exists to support.
• General and administrative (G&A). Costs that benefit the business as a whole rather than any production or service effort: executive compensation, corporate accounting and legal, business development, proposal costs not otherwise charged to B&P, and corporate insurance. G&A allocates over a base that represents the total activity of the business, most often total cost input (TCI) or value-added cost input (VCI).

Some contractors add a fourth or fifth pool: material handling (for firms with significant material or subcontract pass-through volume), and separate bid-and-proposal (B&P) or independent research and development (IR&D) pools for contractors that run enough of that activity to warrant tracking it apart from G&A. Adding pools is not free. Every pool needs its own defensible allocation base and its own audit trail, so a contractor with $3 million in revenue and two contracts gains nothing from a five-pool structure that a $40 million contractor with a diversified portfolio would need.

How do I choose an allocation base?

The allocation base is the denominator: the pool’s total divided by the base produces the rate. Choosing the wrong base does not just produce an ugly rate. It distorts which contracts absorb which costs, and a base that made sense at $2 million in revenue can become the wrong choice at $20 million.

• Direct labor dollars is the default base for overhead and often for fringe. It works well when labor costs across contracts are roughly comparable in composition. It breaks down when one contract uses senior, highly compensated labor and another uses junior staff, because the higher-dollar contract absorbs a disproportionate share of overhead even if it consumes the same amount of facility space and supervisory attention.
• Direct labor hours solves that distortion by allocating on effort rather than dollars. It costs more to administer, because it requires accurate hour tracking by contract in addition to dollar tracking, but for a contractor with a wide pay-rate spread across labor categories, it produces a fairer and more defensible rate.
• Total cost input (TCI) is the most common G&A base. TCI is the sum of all direct costs (labor, materials, travel, subcontracts, ODCs) plus applied overhead, for the accounting period, across the whole business unit. It represents total business activity, which is the theory behind allocating G&A this way.
• Value-added cost input (VCI) is TCI with subcontract and material costs taken out of the base. A contractor that passes through large subcontract or material dollars will find that a TCI base dilutes its G&A rate to a level that does not actually reflect what G&A costs to run the business, because the pass-through dollars inflate the denominator without consuming much G&A effort. VCI corrects for that. Once a fully CAS-covered contractor picks TCI or VCI, CAS 410 requires applying it consistently, and switching bases later is a change in cost accounting practice, not a free adjustment. Contractors outside full CAS coverage are still held by FAR 31.203, which bars fragmenting a base once it has been accepted.

How do provisional rates differ from final rates?

A contractor cannot know its actual indirect rates until the fiscal year closes, but it has to bill the government throughout the year. The solution is a two-step system.

• Provisional (billing) rates are established at the start of the fiscal year, based on the prior year’s actual rates, a forward pricing proposal, or a negotiated estimate. The contracting officer or DCAA approves them under FAR 42.704, and the contractor uses them on every interim invoice for the year.
• Final (actual) rates are computed after year-end and proposed in the annual incurred cost submission, due within six months of fiscal year end under FAR 52.216-7(d)(2)(i). DCAA audits the submission, and the contracting officer establishes final rates, which can run higher or lower than the provisional rates that were actually billed.

The difference between what was billed at provisional rates and what should have been billed at final rates becomes a settlement, either additional payment to the contractor or a refund to the government. The mechanics of that reconciliation, and the ICE model schedules that compute it, are covered in the guide on the DCAA incurred cost submission.

What’s a Forward Pricing Rate Agreement?

A Forward Pricing Rate Agreement (FPRA), negotiated under FAR Subpart 42.17, is a formal agreement between a contractor and the government fixing indirect rates (and sometimes labor rates and other factors) for use in pricing future proposals over a specified period. The alternative to an FPRA is a Forward Pricing Rate Recommendation (FPRR), a rate the administrative contracting officer sets on its own for the government’s use in negotiations, not a binding negotiated agreement.

• An FPRA is worth pursuing for a contractor that submits multiple proposals a year, because it removes the need to defend indirect rates from scratch on every bid. Without one (or an FPRR), the rates in each proposal have to be supported on their own.
• Small contractors with one or two contracts a year often skip the FPRA process, because the negotiation and audit overhead of establishing one does not pay for itself against a small proposal volume. The rate structure and provisional/final rate cycle still apply either way.

What are the most common indirect rate structure errors?

DCAA sees the same structural mistakes across contractors of every size, and each one compounds because the error repeats on every proposal and every incurred cost submission until it is fixed.

• Commingling fringe into overhead, so payroll tax and health insurance costs sit in the same pool as facility and equipment costs. This is not automatically wrong, some small contractors run a single combined pool deliberately, but it has to be a disclosed, consistent choice, not an accident of how the chart of accounts happened to get built.
• Changing the allocation base without a documented reason. Switching from direct labor dollars to direct labor hours, or from TCI to VCI, between one year and the next without disclosing the change is exactly the kind of inconsistency CAS 401 and CAS 402 exist to catch, and it is a finding even for contractors who are not fully CAS-covered.
• Computing rates before excluding unallowable costs. If entertainment, alcohol, or lobbying costs are still sitting in the overhead or G&A pool when the rate is computed, the rate is overstated, the billing to the government is overstated, and the contractor is exposed to the penalty under FAR 42.709 for including unallowable costs in a final indirect cost rate proposal (on contracts over $1 million). Unallowable costs need to be identified and excluded before the rate is calculated, not scrubbed out afterward.
• No pool structure at all. A single “overhead” account covering everything from rent to the CEO’s salary is hard to square with the DFARS 252.242-7006 requirement of a logical and consistent method for allocating indirect costs, and is likely to surface as a deficiency the first time DCAA looks at the accounting system, pre-award or post-award.

What should I do next?

The indirect rate structure is not a one-time setup. It needs to be revisited whenever the contract portfolio shifts materially, subcontract-heavy work replaces labor-heavy work, headcount grows past the point where a single overhead pool still makes sense, or a CAS-covered award changes the disclosure obligations attached to the structure. Building it correctly the first time, with pools and bases that match how the business actually operates, is far cheaper than restructuring it under audit pressure.

• DCAA compliant accounting system requirements, the DFARS 252.242-7006 criteria that the indirect rate structure has to satisfy as part of the whole system
• DCAA incurred cost submission, the annual reconciliation that turns the pool structure into final rates
• Cost Accounting Standards applicability, the CAS coverage thresholds that determine how much of the disclosure and consistency requirement applies to a given contractor
• DCAA contract types, how indirect rates flow differently through cost-plus, fixed-price, and time-and-materials work

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.