A DCAA overhead rate shows how a government contractor allocates shared business costs across the work that benefits from them.
Getting the calculation right requires much more than dividing expenses by direct labor because the cost pool, allocation base, allowability rules, and year-end reconciliation all affect whether an indirect rate can withstand DCAA review.
| In This Article: See how DCAA indirect rates are built, why allocation choices can change the result significantly, and where contractors can run into problems when provisional rates, unallowable costs, or final rates aren’t handled correctly. |
How DCAA Indirect Rates Are Built
FAR 31.203 requires indirect costs to be accumulated into logical cost groupings and allocated using a base that reflects the benefits received. After direct costs are assigned to contracts or other final cost objectives, the remaining indirect costs need an appropriate method of allocation.
| The basic calculation is straightforward:
Indirect rate = allowable indirect cost pool ÷ applicable allocation base |
Fringe, overhead, and G&A generally serve different purposes. Fringe may contain employee-related costs such as payroll taxes and benefits. Overhead commonly captures costs supporting a specific operational function, while G&A generally represents management and administration of the business as a whole.
Contractors asking how to calculate an overhead rate on a government contract should focus closely on the denominator. FAR doesn’t prescribe one universal allocation base for overhead, and significant changes in subcontracting, sales volume, production, or other business circumstances may require a different allocation method.
Why the Allocation Base Deserves Close Attention
A rate can be mathematically accurate and still create an allocation problem. DCAA’s 2026 incurred cost audit program directs auditors to evaluate direct and indirect costs, adjusting entries, government participation, labor records, and indirect executive compensation as part of post-year-end incurred cost work.
CAS 410 adds specific requirements for G&A allocation. Depending on the circumstances, a G&A expense pool may use a total cost input, value-added cost input, or single-element base, such as direct labor dollars. The selected method must represent the business activity that receives the benefit of G&A costs.
A growing subcontractor, for example, may find that an allocation structure developed when most work was performed internally no longer reflects current operations. Rate design should follow the contractor’s actual cost relationships rather than a percentage that simply looks attractive for proposal purposes.
Unallowable Costs Can Affect Both Sides of the Rate
FAR 31.201-6 requires that expressly unallowable and mutually agreed-upon unallowable costs be identified and excluded from government billings, claims, and proposals. Costs that are directly associated can also be unallowable.
Removing an unallowable cost from an indirect pool doesn’t automatically mean removing it from the allocation base. FAR 31.203 states that an accepted base generally can’t be fragmented by removing individual elements.
When a cost input base is used for G&A, properly includable items generally bear their share of G&A regardless of whether the government accepts the underlying cost.
For contractors evaluating an indirect cost rate under DCAA requirements, the distinction is significant. Improperly shrinking the base can shift a larger portion of G&A onto allowable government work.
Provisional Billing Rates Are Temporary
Provisional billing rates versus final rates can create another source of confusion. Provisional billing rates are estimates designed to approximate expected final year-end indirect rates after anticipated unallowable costs are considered. Contractors use them for interim reimbursement until final DCAA indirect rates are settled.
Rates shouldn’t remain static when actual results change significantly. Provisional rates may be adjusted to prevent substantial overpayments or underpayments, while failure to remove unallowable costs or revise rates for significant variances can create deficiencies.
A smaller direct labor base may become particularly important when allocating indirect costs. If overhead spending remains relatively stable while direct labor falls, the actual overhead rate may rise sharply, potentially leaving a sizable reconciliation at year-end.
Final Rates Bring the Full Structure Into View
Under FAR 52.216-7, contractors subject to the Allowable Cost and Payment clause must generally submit an adequate final indirect cost rate proposal within 6 months after the close of each fiscal year. For contractors subject to FAR 52.216-7, the adequate final indirect cost rate proposal must generally be submitted within 6 months following the end of the fiscal year. Final rates and their applicable bases are then established under the FAR Subpart 42.7.
The DCAA’s incurred cost guidance states that missing or unreconcilable required schedules can cause a submission to be reported as inadequate. The final-rate process therefore reaches well beyond recalculating percentages. Pools, bases, accounting records, claimed costs, and supporting documentation need to reconcile.
Executive compensation can also receive attention. The DCAA’s 2026 audit program calls for testing allocable direct and indirect executive compensation against applicable statutory compensation ceilings and evaluating its treatment in G&A and overhead accounts.
Build Defensible Government Contractor Overhead Rates in 2026
An overhead rate for government contractors in 2026 should reflect the economics of the business, the requirements of FAR 31.203, applicable CAS provisions, and actual accounting records. Competitive proposal rates still need support, while provisional and final rates need ongoing attention as business volume and costs change.
Diener & Associates has advised businesses since 1989, including government contractors working through DCAA compliance, indirect rate structures, incurred cost submissions, and contract accounting requirements.
Request a consultation with our team to review your DCAA overhead and indirect rates before a proposal, incurred cost submission, or audit puts the structure under greater scrutiny.