Ask an experienced commercial bookkeeper to take over a government contractor’s books, and the first few weeks can be a surprise. The debits and credits are the same. Almost everything around them is different. Government contractor accounting adds rules about which costs you can bill, how you group them, how you track labor, and how you prove all of it to an auditor.
This guide explains the main differences between government contractor accounting and standard commercial accounting. If you’re moving into federal work, or hiring someone to manage it, these are the basics you need.
The customer sets the rules
In commercial work, you and your customer agree on a price, and your internal accounting is mostly your business. You follow Generally Accepted Accounting Principles (GAAP) for financial statements and tax rules for your return. Beyond that, how you track costs is up to you.
Government contractor accounting works differently. When the federal government is your customer, it gets a say in how you account for costs, especially on cost-type and time-and-materials contracts. The Federal Acquisition Regulation (FAR) sets cost principles. Defense contracts add the Defense Federal Acquisition Regulation Supplement (DFARS). Larger contracts may fall under the Cost Accounting Standards (CAS). And federal auditors, mainly from the Defense Contract Audit Agency (DCAA), check your work.
GAAP still applies. Government contractor accounting layers federal requirements on top of it.
Contract type changes everything
The type of contract you hold shapes how much government contractor accounting matters day to day.
A firm-fixed-price contract works much like a commercial deal. The government pays a set price, and you keep any savings or absorb any overruns. Audit risk tends to be lower.
Cost-reimbursement contracts are the opposite. The government pays your allowable costs plus a fee. That means it needs to see exactly what those costs are. Time-and-materials and labor-hour contracts fall in between, with payment based on hours worked at set rates plus materials. Both put heavy weight on accurate labor records.
Many contractors hold a mix. Their government contractor accounting system has to handle each type correctly at the same time.
Allowable, allocable, and reasonable
Commercial accounting records nearly every legitimate business expense the same way. Government contractor accounting asks three extra questions about each cost.
Is it allowable? The FAR lists costs the government won’t pay for, no matter how normal they are in business. Is it allocable? The cost must benefit the contract it’s charged to, either directly or through a fair share of overhead. Is it reasonable? The amount must be what a prudent business would pay under similar conditions.
A cost has to pass all three tests before you can bill it to the government.
Unallowable costs
Here’s where government contractor accounting departs sharply from commercial practice. Some ordinary business expenses can’t be charged to the government at all. Common examples include:
- Entertainment, including meals and events for clients or staff parties
- Alcoholic beverages
- Most fines and penalties
- Lobbying and political activity
- Bad debts
- Interest on borrowings, in most cases
- Donations and contributions
- Certain advertising and public relations costs
- Some types of executive compensation above set limits
These costs aren’t illegal to spend. You simply can’t recover them from the government. Government contractor accounting requires you to identify them, record them in separate accounts, and keep them out of your indirect rates and invoices. Commercial accounting rarely draws this line.
Direct and indirect costs
Every business has direct and indirect costs. In government contractor accounting, the split carries far more weight.
Direct costs belong to one contract. Think of an engineer’s hours on a specific project or materials bought for it. Indirect costs support the business broadly, such as rent, administrative salaries, and benefits.
Government contractor accounting requires a clear, consistent method for separating these costs. You can’t call a cost direct on one job and indirect on another. Doing so could bill the government twice for the same expense, which auditors look for closely.
Indirect rates and cost pools
Instead of folding overhead into a general margin, government contractor accounting groups indirect costs into pools and turns them into rates.
The most common pools are fringe benefits, overhead, and general and administrative (G&A). Each pool has an allocation base. Fringe might be spread over total labor dollars. Overhead might be spread over direct labor in a particular area. G&A might be spread over total cost input.
During the year, you bill using provisional rates. After year-end, you calculate actual rates and reconcile the difference. If actual rates came in higher, you may be able to bill more. If lower, you may owe a credit. This cycle has no real equivalent in most commercial businesses.
Timekeeping and labor distribution
Commercial companies track time mostly for payroll. Government contractor accounting treats timekeeping as a core accounting control.
Employees must record their own hours daily, charge the correct contract or indirect code, and document any corrections. Supervisors must approve timesheets. Many contractors also record every hour worked, including unpaid overtime, so labor costs spread fairly across contracts.
Approved hours then flow into a labor distribution system that assigns labor cost to each contract and pool. Auditors test this process carefully, sometimes by visiting the workplace and comparing what employees say with what their timesheets show.
Job costing and general ledger control
Government contractor accounting needs a job cost system that tracks costs by contract, task order, and sometimes by contract line item. That job cost data must tie back to the general ledger.
In commercial work, project tracking can live in spreadsheets that never touch the books. For federal contracts, auditors expect every contract cost to sit under general ledger control. If your job cost reports and ledger don’t match, expect questions.
Billing and reporting
Government invoices follow specific formats and rules. Cost-type invoices often list costs by element and apply provisional indirect rates. Time-and-materials invoices list hours by labor category. Each invoice must tie to your recorded costs.
Reporting continues after the year closes. Contractors with flexibly priced contracts generally must submit an incurred cost proposal within six months after fiscal year-end. Many use the agency’s Incurred Cost Electronically (ICE) model, a standard set of schedules that lays out costs the way auditors expect. Commercial businesses have no comparable filing.
Pricing proposals
Commercial companies often price based on what the market will bear. Government contractor accounting turns pricing into a build-up of costs. For many federal bids, you start with direct labor, apply your fringe, overhead, and G&A rates, add other direct costs, and then add a profit or fee.
The combined effect of those rates is often called a wrap rate. It shows how much each dollar of direct labor costs the company once all indirect costs are included. Accurate rates make proposals more competitive and easier to defend. Inflated or unsupported rates can lead to questions during a proposal audit, and rates set too low can leave you working at a loss for years.
Audits and record retention
Commercial companies may face a financial statement audit or a tax exam. Government contractor accounting adds a different type of scrutiny. Federal auditors may review your accounting system before an award, audit your proposals, check your billing, and review your incurred costs years after the fact.
That’s why record retention matters. The FAR generally requires contractors to keep records for at least three years after final payment, and some must be kept longer. Every cost needs support, from receipts to approvals to payment records.
Choosing the right system and support
Not every accounting package handles government contractor accounting well. You need software that can track costs by contract, manage indirect pools, calculate rates, and segregate unallowable costs. The software alone doesn’t make you compliant, though. Your policies, setup, and daily habits matter just as much.
Many growing contractors work with a CPA firm that specializes in government contracts. An expert can set up your chart of accounts, design indirect rate structures, write policies, and prepare you for audits. That support often costs less than fixing problems after an auditor finds them.
Conclusion
Government contractor accounting builds on commercial accounting but adds federal rules at nearly every step. You must screen costs for allowability, separate direct and indirect costs, build indirect rates, track labor with care, and report in formats the government expects. Getting these pieces right protects your margins and your ability to win more work.
Diener & Associates is a CPA firm that specializes in government contractor accounting for businesses in Northern Virginia and nationwide. The firm sets up compliant accounting systems, separates and allocates costs, supports DCAA compliant timekeeping, and prepares incurred cost submissions using the ICE model. To build an accounting foundation that fits federal work, explore Diener & Associates.
