Indirect cost rates for government contractors
Lightbridge ERP defines an indirect cost rate as an indirect cost pool divided by an allocation base, expressed as a percentage. Government contractors use indirect rates to spread shared cost across contracts. The standard pools are fringe, overhead, and general and administrative, applied in sequence to produce a fully burdened labor rate.
An indirect cost rate is a cost pool divided by an allocation base.
Indirect costs benefit more than one contract, so they cannot be charged to a single job. A government contractor gathers them into pools, then divides each pool by a base to produce an indirect rate. Applying that rate to a contract's own base gives the contract a fair, defensible share of shared cost. The mechanics are simple arithmetic, but the structure behind them is what makes billing and pricing hold up under audit.
Indirect rates sit inside the wider discipline of government contract project accounting, which classifies every dollar as direct, indirect, or unallowable. The cost principles in FAR Part 31, the federal rulebook for which costs are allowable, decide what may flow into a pool. The related DCAA compliant accounting guide covers the system controls an auditor relies on.
Lightbridge ERP is an independent ERP advisory firm. This guide describes the field as it is, because defensible indirect rates depend on structure and process, not on any one product.
Every indirect rate has a pool, a base, and a percentage.
Understanding indirect rates starts with three terms. The pool is the cost being spread, the base is what it spreads across, and the rate is the pool divided by the base. Get these three right and the rest follows.
The pool
A pool is a grouping of indirect costs that share a cause, such as all employee benefit costs or all costs of supporting project work. Each pool is the numerator of a rate. A contractor decides which costs belong in which pool, then keeps that structure consistent across periods and contracts.
The base
The base is what the pool is spread across: the denominator. A fringe pool is usually divided by a total labor base, while a G&A pool is commonly divided by a total cost input base. The base should bear a logical relationship to the pool so the resulting allocation is fair and defensible.
The rate
The rate is the pool divided by the base, stated as a percentage. Applying that percentage to a contract's own base gives the contract its share of shared cost. A contractor runs several rates at once, so structuring pools and bases correctly is central to both billing and pricing.
Most government contractors run three indirect pools: fringe, overhead, and G&A.
The standard structure is a three-tier set of pools applied in sequence. Each pool has its own base, and each builds on the cost the prior pool added. The order matters: it is what produces a coherent fully burdened cost rather than double counting.
Fringe
The fringe pool collects employee benefit costs: payroll taxes, health insurance, paid leave, and retirement contributions. The fringe rate is typically applied to a labor base, so benefit cost follows the people working on each contract. Fringe is applied first because benefits attach to the labor that the later pools build on.
Overhead
The overhead pool collects the cost of supporting the work itself, such as engineering supervision, project facilities, and tools shared across contracts. Overhead is commonly applied to a labor base that already carries fringe. Many contractors run separate overhead pools, for example onsite versus offsite, when cost behavior genuinely differs.
General and administrative (G&A)
The G&A pool collects the cost of running the company as a whole: executive management, accounting, contracts, and human resources. G&A is commonly applied to a total cost input base, meaning it spreads across the full cost of each contract rather than labor alone, and it is applied last in the sequence.
Some contractors split or add pools, for example separate onsite and offsite overhead or a material handling pool, when cost behavior genuinely differs. The right number of pools is the number that allocates cost fairly without overcomplicating the structure.
The wrap rate is the cumulative effect of fringe, overhead, and G&A on direct labor.
Stacked together, the three pools produce a fully burdened labor rate, commonly called a wrap rate. Start with a dollar of base labor, add fringe on that labor, add overhead on the fringed labor, then add G&A on the total cost input. The result is a multiplier greater than one that converts raw labor cost into the amount a contractor must bill or price.
The wrap rate is a competitive lever. On labor-heavy federal work, a high wrap rate can price a contractor out of a bid, while an unrealistically low one erodes the profit needed to sustain the business. Designing pools and bases so the wrap rate is both defensible and competitive is a core reason contractors invest in a purpose-built accounting structure.
Contractors bill at provisional indirect rates and settle to final rates after year-end.
During the year a contractor does not yet know its actual indirect rates, so it bills cost reimbursable and similar work using provisional, or billing, rates. After the fiscal year closes, it calculates actual final rates from real pool and base amounts and reconciles what it billed against what those rates support. The difference is a true-up owed to or from the government.
Final rates are settled through the annual incurred cost submission, sometimes called the incurred cost proposal, which an audit agency can examine. The mechanics of that submission, along with Cost Accounting Standards and the related forms, are covered in the incurred cost, CAS, and WAWF guide. Filing deadlines, adequacy criteria, and thresholds change, so verify current requirements against the official source such as acquisition.gov and the cognizant audit agency.
Costs in an indirect pool must be allowable, allocable, and reasonable under FAR Part 31.
Indirect rates are only as sound as the costs inside the pools. FAR Part 31, the federal cost principles, requires every pooled cost to be allowable, allocable, and reasonable. Certain costs, including some entertainment, lobbying, and interest, are expressly unallowable. Those costs must be removed from both the pool and the base before a rate is computed, so they never reach a billing or a final rate even when they are otherwise ordinary business expenses.
Larger or covered contracts may also fall under Cost Accounting Standards, which impose consistency and disclosure requirements on how a contractor accumulates and allocates cost. The Defense Contract Audit Agency tests indirect rates for compliance with these rules. Because penalties for getting allowability or consistency wrong are real and the specifics shift over time, verify current requirements against the official source such as acquisition.gov and DCAA guidance.
A system that computes indirect rates correctly protects billing and audit standing.
Computing indirect rates by hand does not scale. A purpose-built accounting system collects costs into pools, applies rates to the right base, screens unallowable costs, and reconciles billings to actuals, all with an audit trail. Without that, a contractor risks rejected invoices, questioned costs, or a true-up surprise at year-end. Several vendors market platforms aimed at federal contractors with strong indirect rate engines, including Deltek Costpoint, which is widely used for multi-pool indirect rate calculation, and Unanet.
Deltek, Costpoint, and Unanet are trademarks of their respective owners, and Lightbridge ERP is not affiliated with, nor a partner or reseller of, any of them. As an independent advisor, Lightbridge evaluates systems on fit for a contractor's pool and base structure, never on price. The wider government contract project accounting guide sets indirect rates in the context of contract types and job cost.
Lightbridge ERP designs the pool and base structure that defensible indirect rates depend on.
Lightbridge ERP is an independent, vendor-neutral ERP advisory firm. For government contractors it focuses on the structure that defensible indirect rates require: pool design, base selection, the segregation of allowable and unallowable cost, and the consistency that federal cost accounting expects. The aim is a structure and a workflow that produce accurate, audit-ready rates, not a particular brand of software.
What keeps the advice honest is the commercial model. Lightbridge accepts no vendor kickbacks, no reseller quotas, and no partner-tier incentives, so a recommendation is driven by fit rather than commission. For contractors weighing systems, a structured ERP selection and ERP consulting are the right starting point, and the government contracting practice covers the federal sector in depth.
This guide is general information, not legal, accounting, or tax advice. Regulatory requirements, dates, thresholds, and penalties change. Verify current rules against official sources such as acquisition.gov, the Defense Contract Audit Agency, and the cognizant audit agency before acting.
Indirect cost rates: frequently asked questions
- What is an indirect cost rate?
- An indirect cost rate is an indirect cost pool divided by an allocation base, expressed as a percentage. The pool is a group of shared costs, for example fringe benefits, and the base is what those costs are spread across, for example direct labor dollars. Applying the rate to each contract's base gives the contract its fair share of cost that benefits more than one job. Government contractors usually run several rates at once: fringe, one or more overhead rates, and general and administrative. Because each rate depends on both its pool and its base, structuring them correctly is central to accurate billing and pricing.
- What is the difference between an indirect cost pool and an allocation base?
- The pool is the numerator of a rate and the base is the denominator. A pool gathers indirect costs that share a cause, such as all employee benefits or all costs of supporting project work. The base is the measure those pooled costs are divided by and then applied against, such as total direct labor or total cost input. The relationship between pool and base should be logical: the base should have a causal or beneficial connection to the pooled cost so the allocation is fair. A contractor that pools the wrong costs or picks an unrepresentative base produces rates that misstate contract cost and may not survive audit.
- What are the fringe, overhead, and G&A rates?
- Fringe, overhead, and general and administrative are the three indirect rates most government contractors use, applied in sequence. Fringe collects employee benefit costs such as payroll taxes, insurance, and leave, and is usually applied to a labor base. Overhead collects the cost of supporting the contract work itself, such as supervision and project facilities, and is applied to a labor base that already carries fringe. G&A collects the cost of running the whole company and is commonly applied to a total cost input base. Layering these rates in order builds the fully burdened cost of every contract.
- What is a wrap rate?
- A wrap rate, also called a fully burdened labor rate, is the cumulative effect of applying fringe, overhead, and G&A on top of base labor. It expresses how much a contractor must bill or price for each dollar of direct labor once all indirect rates are layered on. For example, a base labor dollar plus fringe, then overhead on the fringed labor, then G&A on the total cost input produces a multiplier greater than one. Contractors watch the wrap rate closely because it drives competitiveness on labor-heavy work: a high wrap rate can price a contractor out of a bid, while an unrealistically low one can erode profit.
- What is the difference between provisional and final indirect rates?
- Provisional rates, also called billing rates, are estimated indirect rates a contractor uses to bill cost reimbursable and similar work during the year, before actual results are known. Final rates are the actual indirect rates calculated after the fiscal year closes, based on real pool and base amounts. The contractor reconciles billings made at provisional rates to the final rates, which produces a true-up amount owed to or from the government. Final rates are typically settled through the annual incurred cost submission. Specific filing deadlines and thresholds change over time, so verify current requirements against the official source such as acquisition.gov and DCAA guidance.
- What is an incurred cost submission?
- An incurred cost submission, sometimes called an incurred cost proposal, is the annual filing in which a government contractor reports its actual indirect rates and claimed costs for a completed fiscal year. It supports the settlement of final indirect rates and the true-up of amounts billed at provisional rates. The submission is subject to audit, traditionally by the Defense Contract Audit Agency, which tests whether claimed costs are allowable, allocable, and reasonable and whether rates were computed correctly. Filing deadlines, adequacy criteria, and thresholds change over time, so confirm current rules against official sources such as acquisition.gov and DCAA before preparing a submission.
- How does FAR Part 31 affect indirect rates?
- FAR Part 31, the federal cost principles, governs whether costs that flow into indirect pools may be reimbursed. Every pooled cost must be allowable, allocable, and reasonable, and certain costs such as some entertainment, lobbying, and interest are expressly unallowable. Unallowable costs must be removed from the pools and the base before a rate is computed, so they never reach a billing or a final rate. Some contracts are also subject to Cost Accounting Standards, which add consistency and disclosure requirements on how a contractor accumulates and allocates cost. Because these rules carry real penalties when missed and change over time, verify current requirements against acquisition.gov and DCAA guidance.
- How does Lightbridge ERP help with indirect rate structure?
- Lightbridge ERP is an independent, vendor-neutral ERP advisory firm. For government contractors it focuses on the structure that defensible indirect rates require: pool design, base selection, the segregation of allowable and unallowable cost, and the consistency that federal cost accounting expects. Because Lightbridge accepts no vendor kickbacks, reseller quotas, or partner-tier incentives, its platform recommendations are driven by fit rather than commission. It guides selection and readiness across systems and frames rate readiness around process and structure, never around price.
From understanding indirect rates to a system that proves them.
When the question shifts from how indirect rates work to whether your structure can withstand audit, Lightbridge ERP designs the pool and base structure and runs a vendor-neutral selection.