Indirect rates are percentages used to distribute shared business expenses — costs like rent, utilities, employee benefits, and executive salaries — across the specific contracts, projects, or grants that benefit from them. Each rate is calculated by dividing a pool of similar indirect costs by an allocation base tied to project activity, and the resulting percentage gets applied to each contract so it carries its fair share of overhead. Getting these rates right matters most for government contractors and federal grant recipients, where regulators scrutinize every dollar and a miscalculated rate can trigger penalties, lost funding, or disqualification from future awards.
Direct Costs Versus Indirect Costs
Before you can build an indirect rate, you need a clean separation between direct and indirect costs. Direct costs are expenses you can trace to a single contract, project, or product. The labor hours an engineer logs on one contract, materials purchased exclusively for that job, and travel to a client site for that specific project are all direct. They get charged straight to the work that caused them.
Indirect costs are everything that benefits the business broadly but can’t be pinned to one final cost objective. Corporate rent, the CEO’s salary, the accounting team’s payroll, and company-wide cybersecurity infrastructure fall here. These expenses keep the organization running and support every project simultaneously, so they need to be allocated rather than directly charged. Federal regulations define a cost as allocable to a government contract if it was incurred specifically for that contract, benefits both the contract and other work in reasonable proportion, or is necessary to the overall operation of the business even without a direct link to any single project.1eCFR. 48 CFR 31.201-4 – Determining Allocability
The line isn’t always obvious, and that’s where consistency requirements bite. If your company treats a type of expense as direct on one contract, you can’t classify the same type of expense as indirect on another. This rule, codified in Cost Accounting Standard 402, prevents double-counting where a cost gets charged directly to a contract and then again through an indirect rate allocation.2eCFR. 48 CFR 9904.402 – Cost Accounting Standard, Consistency in Allocating Costs Incurred for the Same Purpose Written accounting policies should spell out which cost types are direct and which are indirect, and you need to follow those policies across every contract.
The Three Main Indirect Cost Pools
Indirect costs don’t go into one giant bucket. They’re organized into cost pools — logical groupings of similar expenses. Most government contractors use a tiered structure with three primary pools.
Fringe Benefits
The fringe pool captures the cost of employing people beyond base wages. Employer-paid health insurance, retirement plan contributions, payroll taxes, workers’ compensation premiums, and paid leave all belong here. These costs are driven by headcount and compensation levels, so they get allocated based on total labor dollars. Every hour of labor your company pays for generates fringe costs, whether that labor is direct, overhead, or administrative.
Overhead
The overhead pool covers expenses tied to supporting the direct execution of project work. Facility costs, IT infrastructure, project supervision, equipment maintenance, and operational supplies are typical overhead items. These costs exist because you have projects in production; a company with no active contracts would shed most of them. Overhead is usually allocated against direct labor dollars or direct labor hours, because the volume of direct work drives the need for these support costs.
General and Administrative
The G&A pool collects expenses that sustain the corporate infrastructure regardless of project volume. Executive compensation, legal counsel, corporate accounting, human resources, and business insurance land here. Because these costs benefit the entire organization, the G&A pool is typically allocated over the broadest base available. Some organizations also maintain specialized pools for items like material handling or independent research and development when those costs are significant enough to warrant separate tracking.
Costs within a pool should share a similar causal relationship with the allocation base used to distribute them. Federal regulations call this the principle of homogeneous cost groupings. If a cost behaves differently from everything else in its pool, it probably needs a separate pool. The regulations also recognize practical limits: when simpler methods produce substantially the same result, there’s no need to over-complicate the structure.3Acquisition.GOV. FAR 31.203 – Indirect Costs
Choosing an Allocation Base
The allocation base is the denominator in the rate formula, and choosing the right one matters more than most people realize. A good base has a causal or beneficial relationship with the costs it’s distributing. If the costs in a pool rise and fall with direct labor hours, then direct labor hours should be the base. If the costs benefit all activities equally, you need a broader base.
In practice, each pool typically uses a different base:
- Fringe pool: total labor dollars, including direct labor, overhead labor, G&A labor, and bid-and-proposal labor. Every employee generates fringe costs, so the base includes all labor.
- Overhead pool: direct labor dollars or direct labor hours. Overhead costs primarily support hands-on project work.
- G&A pool: total cost input, which includes all direct costs plus the indirect costs already allocated from other pools. Because G&A benefits the whole enterprise, the broadest possible base produces the fairest distribution.
Once an appropriate base has been accepted, you cannot cherry-pick which elements stay in it. Federal acquisition rules prohibit fragmenting the base by removing individual cost elements. Every item that properly belongs in the base must remain there and absorb its proportional share of indirect costs, including costs the government won’t reimburse. The logic is counterintuitive but important: if unallowable costs are stripped from the base, the remaining allowable costs absorb a disproportionately large share of indirect expenses, and the government ends up overpaying.3Acquisition.GOV. FAR 31.203 – Indirect Costs
Modified Total Direct Costs for Grant Recipients
Organizations funded by federal grants rather than contracts often use a different base called Modified Total Direct Costs (MTDC). MTDC includes salaries, fringe benefits, materials, supplies, services, travel, and up to the first $50,000 of each subaward. It excludes equipment, capital expenditures, patient care charges, rental costs, tuition remission, scholarships, participant support costs, and any subaward amounts above $50,000.4eCFR. 2 CFR 200.1 – Definitions The exclusions prevent large pass-through expenditures from absorbing an unreasonable share of indirect costs.
The Indirect Rate Formula
The math is straightforward division. Take the total costs in an indirect pool, divide by the allocation base, and the result is a percentage. That percentage tells you how much indirect cost gets loaded onto each dollar (or hour) of base activity.
Indirect Rate = Indirect Cost Pool ÷ Allocation Base
A 110% overhead rate means that for every $1.00 of direct labor, $1.10 in overhead gets allocated. A 13.5% G&A rate means every $1.00 of total cost input carries $0.135 in G&A expenses. These rates cascade through the tiers. The fringe rate applies first to labor, then overhead applies to direct labor (now burdened with fringe), and finally G&A applies to the entire cost input including the previously allocated fringe and overhead.
Consider a simplified example: a company with $7 million in direct contract labor, $7.7 million in overhead pool costs, and $2.7 million in G&A pool costs allocated over a $20 million total cost input base.
- Overhead rate: $7,700,000 ÷ $7,000,000 = 110%
- G&A rate: $2,700,000 ÷ $20,000,000 = 13.5%
If Contract A has $4 million in direct labor, it absorbs $4.4 million in overhead (110% × $4 million). Contract A’s total cost input of $10.6 million then absorbs roughly $1.43 million in G&A (13.5% × $10.6 million). The tiered structure ensures that larger contracts with more direct activity absorb proportionally more shared cost, while smaller contracts aren’t overloaded.5Defense Contract Audit Agency. Overview of Indirect Costs and Rates
Unallowable Costs
Not every business expense can be passed along to the government. Federal acquisition regulations identify specific cost categories that are unallowable for reimbursement, meaning you can spend the money but you can’t include it in indirect cost pools for government recovery. The list is longer than most people expect.
Common categories of unallowable costs include:
- Entertainment and social activities: sporting events, parties, company picnics, and similar gatherings
- Alcoholic beverages, unallowable in all circumstances
- Fines and penalties, unless incurred because of compliance with contract terms
- Lobbying and political activity aimed at influencing legislation or elections
- Bad debts and collection costs, including related legal expenses
- Interest on borrowings, along with bond discounts and financing costs
- Contributions and donations, with narrow exceptions for community service participation
- Federal income taxes and certain excise taxes
- Goodwill and costs related to mergers, acquisitions, and reorganizations
Advertising and public relations costs are generally unallowable, though limited exceptions exist for recruitment advertising, required contract notices, and promoting export sales at trade shows.6Acquisition.GOV. FAR 31.205-1 – Public Relations and Advertising Costs
The treatment of unallowable costs in rate calculations requires careful handling. Expressly unallowable costs must be identified and excluded from any billing or proposal submitted to the government.7Acquisition.GOV. FAR 31.201-6 – Accounting for Unallowable Costs Those same unallowable costs must remain in the allocation base so they absorb their fair share of indirect expenses. The distinction: unallowable costs come out of the numerator (the pool) but stay in the denominator (the base).
The Five-Part Allowability Test
Before any cost lands in an indirect pool destined for government recovery, it must pass five requirements. A cost is allowable only when it satisfies all five simultaneously:
- Reasonableness: a prudent businessperson would pay this amount for this purpose.
- Allocability: the cost benefits the contract or is necessary to the overall operation of the business.
- Compliance with Cost Accounting Standards, or with generally accepted accounting principles if CAS doesn’t apply.
- Contract terms: the specific contract doesn’t prohibit or limit the cost.
- FAR cost principles: no specific limitation in the FAR disallows the cost.
Failing any single element makes the cost unallowable.8Acquisition.GOV. FAR 31.201-2 – Determining Allowability A lavish holiday party might be allocable to the business and comply with CAS, but it fails the reasonableness test and is also specifically identified as unallowable entertainment. Experienced contractors screen every expense through all five factors before building their rate proposals.
Types of Indirect Rates
Indirect rates aren’t a single number calculated once. Contractors work with several types across the contracting lifecycle.
Provisional and Billing Rates
At the start of each fiscal year, contractors establish provisional rates based on forecasted costs and activity levels. These estimated rates allow billing on cost-type contracts throughout the year so contractors can recover indirect expenses as work progresses. The contracting officer or auditor sets billing rates based on recent audit results, prior-year experience, or similar reliable data, with the goal of keeping them as close as possible to anticipated final rates, adjusted for any unallowable costs.9Acquisition.GOV. FAR 42.704 – Billing Rates Either party can request a revision during the year if the rates are tracking significantly above or below actual costs.
Final Rates
After the fiscal year ends, the contractor calculates final rates using actual incurred costs. These reflect what really happened rather than what was forecasted. The contractor must submit a final indirect cost rate proposal within six months after the end of its fiscal year.10Acquisition.GOV. FAR 52.216-7 – Allowable Cost and Payment The contracting officer then establishes final rates, and any difference between provisional billings and final amounts triggers a reconciliation. If provisional rates were too high, the contractor owes money back. If they were too low, the contractor recovers the shortfall.11eCFR. 48 CFR 42.705 – Final Indirect Cost Rates
Forward Pricing Rate Agreements
A Forward Pricing Rate Agreement (FPRA) locks in projected indirect rates for use in pricing future contract proposals over a defined period. The FPRA is negotiated between the contractor and the government, and once established, contracting officers use those rates as the basis for pricing all contracts, modifications, and other actions during the agreement period.12eCFR. 48 CFR 15.407-3 – Forward Pricing Rate Agreements FPRAs streamline the proposal process for contractors with a high volume of new work.
Negotiated Indirect Cost Rate Agreements
Grant recipients and some contractors receive a Negotiated Indirect Cost Rate Agreement (NICRA) from their cognizant federal agency. The NICRA establishes the proportion of indirect costs each award should bear and provides a consistent process for allocating costs that aren’t tied to a single grant or project. Any organization receiving federal awards that wants to recover indirect costs on cost-reimbursable grants, contracts, or cooperative agreements needs either a NICRA or must elect the de minimis rate.13U.S. Department of Labor. Frequently Asked Questions (FAQs)
The De Minimis Rate for Grant Recipients
Organizations that have never negotiated a federal indirect cost rate have a simpler option. Under the Uniform Guidance, eligible recipients and subrecipients may elect a de minimis rate of up to 15% of modified total direct costs without negotiating or documenting their actual indirect expenses.14eCFR. 2 CFR 200.414 – Indirect Costs The rate was increased from 10% to 15% under the 2024 revisions to the Uniform Guidance, effective for new federal awards issued on or after October 1, 2024.
The de minimis rate is available indefinitely, but once elected, it must be used for all federal awards until the organization chooses to negotiate a rate instead. Federal agencies and pass-through entities cannot force a recipient to use a rate lower than either their negotiated rate or the de minimis rate unless a specific federal statute requires it. The de minimis rate does not apply to cost-reimbursement contracts issued directly by the federal government under the FAR.14eCFR. 2 CFR 200.414 – Indirect Costs
For smaller nonprofits or organizations new to federal funding, the de minimis rate often makes sense. Negotiating a rate requires substantial accounting infrastructure and documentation. Organizations with actual indirect costs well above 15% of MTDC are leaving money on the table if they don’t negotiate, since the de minimis rate caps what they can recover.
Submissions, Audits, and Penalties
The six-month deadline for submitting a final indirect cost rate proposal isn’t a suggestion. Missing it can delay rate settlement for years, freeze final payments on completed contracts, and attract unwanted scrutiny. The submission — commonly called an Incurred Cost Proposal or Incurred Cost Electronically (ICE) model — lays out the contractor’s actual indirect cost pools, allocation bases, and resulting rates for the completed fiscal year.
For defense contractors, the Defense Contract Audit Agency (DCAA) typically reviews these submissions. During the audit, DCAA tests whether costs are allowable, allocable, and reasonable, and verifies compliance with contract terms.15Defense Acquisition University. Introduction to DCAA Audit of Incurred Cost Proposals Auditors identify exceptions where claimed costs don’t comply with FAR cost principles, and those exceptions become the basis for negotiation between the contractor and contracting officer.
Including unallowable costs in an indirect rate proposal triggers financial penalties, not just a negotiation adjustment. If a cost is expressly unallowable under FAR cost principles, the penalty equals the full amount of the disallowed cost allocated to covered contracts, plus interest on any portion already paid. If the contractor knew the cost was unallowable before submitting the proposal — because it had been previously determined unallowable for that contractor — the penalty doubles to two times the disallowed amount.16GovInfo. 48 CFR 42.709-2 – General
These penalties apply whether or not the unallowable costs were actually paid to the contractor, and they stack on top of any other administrative, civil, or criminal penalties. The practical takeaway: screen indirect cost pools aggressively before submission. Many contractors engage specialized accountants to scrub their proposals precisely because the penalty exposure on a missed unallowable cost far exceeds the cost of professional review.