What is government contract accounting?

Government contract accounting is the practice of capturing, segregating, and reporting costs by contract and project so a contractor can bill a federal customer accurately and pass audit. It rests on a few ideas: classify every cost as direct, indirect, or unallowable; collect indirect costs into pools such as fringe, overhead, and general and administrative; and apply those pools to contracts through indirect rates. The Federal Acquisition Regulation, especially FAR Part 31 on cost principles, defines which costs are allowable. Lightbridge ERP advises on the system and process that make this work, independently and without selling any single platform.

What is an indirect rate?

An indirect rate is the ratio used to spread a pool of indirect cost across the contracts that benefit from it. You take the cost in a pool, for example fringe benefits, and divide it by a base, for example direct labor dollars, to get a percentage. That percentage is then applied to each contract's base so it carries a fair share of the shared cost. Contractors usually run several rates at once: fringe, one or more overhead rates, and G&A. Because the rates depend on both pool and base, structuring them correctly is central to both billing and profitability.

What is the difference between direct and indirect costs?

A direct cost is identified specifically with one contract or project, such as the hours an engineer charges to a particular job or material consumed by it. An indirect cost benefits more than one contract and cannot be assigned to a single one, such as rent, accounting staff, or employee benefits. Direct costs are charged straight to the contract that caused them. Indirect costs are gathered into pools and allocated through rates. The same kind of expense can be direct on one contract and indirect on another, so a contractor must apply its cost treatment consistently, which is a core expectation under federal cost accounting.

What are fringe, overhead, and G&A pools?

These are the three indirect cost pools most government contractors use. 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, project facilities, and shared tools. General and administrative, or G&A, collects the cost of running the whole company, such as executives, finance, and contracts, and is commonly applied to a total cost input base. Layering these pools correctly determines the fully burdened cost of every contract and the rates a contractor bills against.

What is cost-plus accounting?

Cost-plus, more precisely cost reimbursable contracting, means the government reimburses a contractor's allowable, allocable, and reasonable costs and then adds a fee. Common variants are cost plus fixed fee and cost plus incentive fee. Because the customer pays actual incurred cost, the accounting bar is high: every billed dollar must trace to a compliant cost record, indirect rates must be applied correctly, and unallowable costs must be screened out. Contractors typically bill at provisional rates during the year, then true up to actual final rates after year-end through an incurred cost submission. Lightbridge ERP frames cost-plus readiness around process and system, never around price.

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 to final rates, which can produce an amount owed to or from the government. Final rates are typically submitted in an incurred cost proposal subject to audit. Specific filing deadlines and thresholds change over time, so verify current requirements against the official source such as acquisition.gov and DCAA guidance.

Why does a compliant accounting system matter for government contracts?

A compliant accounting system lets a contractor segregate direct, indirect, and unallowable costs, accumulate cost by contract and task, apply indirect rates consistently, and reconcile billings to actuals. Federal cost reimbursable and T&M work generally requires an accounting system that an auditor can rely on, and adequacy can be assessed before certain awards. Without it, a contractor risks rejected invoices, questioned costs, withheld payments, or loss of eligibility for cost-type work. Penalty and disallowance specifics vary, so confirm current rules against official sources such as acquisition.gov, DCAA, and the cognizant audit agency. Lightbridge ERP advises on system readiness rather than certifying any outcome.

How does Lightbridge ERP help government contractors?

Lightbridge ERP is an independent, vendor-neutral ERP advisory firm. For government contractors it focuses on the accounting structure that compliant cost work demands: contract and project cost design, indirect rate pool structure, the segregation of direct, indirect, and unallowable costs, and audit-ready processes. 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, for security-focused work such as CMMC readiness, points contractors to the dedicated practice at Lightbridge Cloud rather than overreaching its own scope.

SK Written by Sarika Krishnan with Robert LabardeeSenior Program Manager and Founder and CEO

Last updated June 2026.

Government contract project accounting

Lightbridge ERP defines government contract project accounting as the discipline of recording, segregating, and reporting costs by contract and project so a contractor can bill the government accurately and survive audit. It governs contract types, direct versus indirect costs, indirect rate pools, and the controls federal regulation expects.

The GovCon practice How to choose an ERP

Government contract project accounting tracks cost by contract so a contractor can bill and survive audit.

Government contract project accounting is the way a federal contractor records and reports cost. Unlike ordinary commercial bookkeeping, it must answer a harder question: how much did each contract truly cost, broken down in a way an auditor can trust. That requirement flows from the Federal Acquisition Regulation, the rulebook for federal buying, and from the cost principles in FAR Part 31 that define which costs are allowable and how they may be charged.

Three ideas hold the discipline together: classify every dollar as direct, indirect, or unallowable; collect indirect costs into pools and apply them through indirect rates; and accumulate cost by contract and task so billing ties back to evidence. Contractors performing cost reimbursable or time and materials work generally need an accounting system an auditor can rely on. This guide explains the concepts; for the federal sector practice see government contracting and the related DCAA compliant accounting guide.

Lightbridge ERP is an independent ERP advisory firm. This guide describes the field as it is, because compliant cost accounting depends on structure and process, not on any one product.

Federal contract types decide how much cost detail a contractor must prove.

The contract vehicle sets the accounting bar. Fixed price work shifts cost risk to the contractor, while cost reimbursable work shifts it toward the government and raises audit expectations. These are the three families most contractors encounter.

Firm fixed price (FFP)

The contractor agrees to a set price for a defined scope. Cost risk sits entirely with the contractor: profit rises if costs come in low and erodes if they run high. FFP still demands project cost tracking, because knowing true cost protects margin even when the customer does not reimburse actuals.

Time and materials (T&M)

The government pays fixed hourly labor rates plus the cost of materials. Labor categories and qualifications are defined in the contract, so accurate timekeeping by labor category and project is essential. T&M shifts some risk to the government but caps total value at a ceiling the contractor cannot exceed without authorization.

Cost reimbursable (cost-plus)

The government reimburses allowable, allocable, and reasonable costs and adds a fee. Variants include cost plus fixed fee and cost plus incentive fee. Because the customer pays actual cost, these contracts carry the heaviest accounting and audit expectations: every dollar billed must trace to a compliant cost record.

Government contract accounting separates every cost into direct, indirect, or unallowable.

Cost segregation is the foundation of a compliant system. FAR Part 31 expects a contractor to identify and consistently treat each cost so that billing reflects only what the government agreed to pay. The three classifications below drive everything downstream, from job cost to indirect rates.

Direct costs

Costs identified specifically with a single contract or project, such as the labor of an engineer working on that contract or material consumed by it. Direct costs are charged straight to the cost objective that caused them.

Indirect costs

Costs that benefit more than one contract and cannot be tied to just one, such as facility rent, finance staff, or employee benefits. Indirect costs are collected into pools and spread across contracts through rates rather than charged to one job.

Unallowable costs

Costs that the government will not reimburse, such as certain entertainment, lobbying, and interest, addressed in FAR Part 31. Unallowable costs must be identified and segregated so they never reach a billing or a final rate calculation, even when they are otherwise ordinary business expenses.

Allowability and segregation rules carry real penalties when missed, and the specifics shift over time, so verify current requirements against the official source such as acquisition.gov and Defense Contract Audit Agency guidance.

Indirect rate pools (fringe, overhead, and G&A) spread shared cost across contracts.

Because indirect costs benefit many contracts, a contractor collects them into pools and divides each pool by a base to produce an indirect rate. Applying that rate to each contract gives a fair, defensible share of shared cost. Most contractors run these three pools.

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.

Overhead

The overhead pool collects costs of supporting the work itself, such as engineering supervision, project facilities, and tools shared across contracts. 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.

Stacked together, these pools produce a fully burdened cost: direct cost plus fringe on labor, plus overhead on the work, plus G&A on total cost input. Getting the pool and base structure right is what makes both billing and pricing defensible.

Contractors bill at provisional indirect rates and true up to actual 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 the rates support. The difference is owed to or from the government.

Final rates are typically reported through an incurred cost submission that an audit agency can examine, and revenue recognition on long contracts often follows a percentage of completion accounting method. The mechanics of the annual submission, along with related forms and certifications, are covered in the incurred cost, CAS, and WAWF guide. Filing deadlines, thresholds, and certification rules change, so verify current requirements against the official source such as acquisition.gov and the cognizant audit agency.

Job cost accounting accumulates labor, material, and indirect burden against each contract.

Job cost accounting, sometimes called project cost accounting, is the engine that records cost at the level a federal customer cares about: the contract and its tasks. Timekeeping posts labor by employee and project, purchasing posts material to the right job, and indirect rates apply burden on top. The result is a real-time view of cost against budget and funding for every contract.

This is where contract type, cost classification, and indirect rates come together. Done well, job cost accounting supports accurate invoicing, early warning when a contract approaches its funding ceiling, and an audit trail that ties every billed dollar to evidence. It is also the reason many contractors outgrow general commercial accounting tools and seek a system built for federal cost work.

A compliant accounting system protects payment, eligibility, and audit standing for government contractors.

For cost reimbursable and time and materials work, a contractor generally needs an accounting system an auditor can rely on, and adequacy may be assessed before certain awards. A compliant system segregates direct, indirect, and unallowable cost, accumulates cost by contract, applies indirect rates consistently, and reconciles billings to actuals. Without it, a contractor risks rejected invoices, questioned costs, withheld payment, or loss of eligibility for cost-type work.

Cost compliance is one pillar; safeguarding controlled information is another. Cybersecurity Maturity Model Certification readiness sits with the dedicated practice at Lightbridge Cloud, covered at CMMC compliance. Several vendors market accounting platforms aimed at federal contractors, including Deltek Costpoint 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 cost structure, never on price.

Lightbridge ERP designs the cost structure that government contract accounting depends on.

Lightbridge ERP is an independent, vendor-neutral ERP advisory firm. For government contractors it focuses on the structure that compliant cost work requires: contract and project cost design, indirect rate pool and base structure, the segregation of direct, indirect, and unallowable cost, and processes built to stand up to audit. The aim is a system and a workflow that produce accurate billing and a clean trail, 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 guidance, not legal, audit, or accounting advice. Regulatory requirements, dates, thresholds, and penalties change. Verify current rules against official sources such as acquisition.gov, the Defense Contract Audit Agency, NIST, the NARA CUI Registry, DCSA, and DDTC or BIS before acting.

Government contract project accounting: frequently asked questions

What is government contract accounting?: Government contract accounting is the practice of capturing, segregating, and reporting costs by contract and project so a contractor can bill a federal customer accurately and pass audit. It rests on a few ideas: classify every cost as direct, indirect, or unallowable; collect indirect costs into pools such as fringe, overhead, and general and administrative; and apply those pools to contracts through indirect rates. The Federal Acquisition Regulation, especially FAR Part 31 on cost principles, defines which costs are allowable. Lightbridge ERP advises on the system and process that make this work, independently and without selling any single platform.
What is an indirect rate?: An indirect rate is the ratio used to spread a pool of indirect cost across the contracts that benefit from it. You take the cost in a pool, for example fringe benefits, and divide it by a base, for example direct labor dollars, to get a percentage. That percentage is then applied to each contract's base so it carries a fair share of the shared cost. Contractors usually run several rates at once: fringe, one or more overhead rates, and G&A. Because the rates depend on both pool and base, structuring them correctly is central to both billing and profitability.
What is the difference between direct and indirect costs?: A direct cost is identified specifically with one contract or project, such as the hours an engineer charges to a particular job or material consumed by it. An indirect cost benefits more than one contract and cannot be assigned to a single one, such as rent, accounting staff, or employee benefits. Direct costs are charged straight to the contract that caused them. Indirect costs are gathered into pools and allocated through rates. The same kind of expense can be direct on one contract and indirect on another, so a contractor must apply its cost treatment consistently, which is a core expectation under federal cost accounting.
What are fringe, overhead, and G&A pools?: These are the three indirect cost pools most government contractors use. 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, project facilities, and shared tools. General and administrative, or G&A, collects the cost of running the whole company, such as executives, finance, and contracts, and is commonly applied to a total cost input base. Layering these pools correctly determines the fully burdened cost of every contract and the rates a contractor bills against.
What is cost-plus accounting?: Cost-plus, more precisely cost reimbursable contracting, means the government reimburses a contractor's allowable, allocable, and reasonable costs and then adds a fee. Common variants are cost plus fixed fee and cost plus incentive fee. Because the customer pays actual incurred cost, the accounting bar is high: every billed dollar must trace to a compliant cost record, indirect rates must be applied correctly, and unallowable costs must be screened out. Contractors typically bill at provisional rates during the year, then true up to actual final rates after year-end through an incurred cost submission. Lightbridge ERP frames cost-plus readiness around process and system, never around price.
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 to final rates, which can produce an amount owed to or from the government. Final rates are typically submitted in an incurred cost proposal subject to audit. Specific filing deadlines and thresholds change over time, so verify current requirements against the official source such as acquisition.gov and DCAA guidance.
Why does a compliant accounting system matter for government contracts?: A compliant accounting system lets a contractor segregate direct, indirect, and unallowable costs, accumulate cost by contract and task, apply indirect rates consistently, and reconcile billings to actuals. Federal cost reimbursable and T&M work generally requires an accounting system that an auditor can rely on, and adequacy can be assessed before certain awards. Without it, a contractor risks rejected invoices, questioned costs, withheld payments, or loss of eligibility for cost-type work. Penalty and disallowance specifics vary, so confirm current rules against official sources such as acquisition.gov, DCAA, and the cognizant audit agency. Lightbridge ERP advises on system readiness rather than certifying any outcome.
How does Lightbridge ERP help government contractors?: Lightbridge ERP is an independent, vendor-neutral ERP advisory firm. For government contractors it focuses on the accounting structure that compliant cost work demands: contract and project cost design, indirect rate pool structure, the segregation of direct, indirect, and unallowable costs, and audit-ready processes. 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, for security-focused work such as CMMC readiness, points contractors to the dedicated practice at Lightbridge Cloud rather than overreaching its own scope.

From understanding the rules to a system that meets them.

When the question shifts from how government contract accounting works to whether your system can prove it, Lightbridge ERP designs the cost structure and runs a vendor-neutral selection.

Talk to an ERP advisor See the GovCon practice