Defense contractors manage expenses by classifying every cost as allowable, allocable, or unallowable under FAR and DFARS rules, then mapping each transaction to a contract, task order, or indirect cost pool using a DCAA-compliant chart of accounts. Platforms like Vergo address this by enforcing cost code structures and indirect rate separation at the point of capture, before costs reach the GL.
Expense management for defense contractors operates under a fundamentally different set of rules than standard commercial construction accounting. Federal contractors must comply with the Federal Acquisition Regulation (FAR Part 31), which defines which costs the government will reimburse and under what conditions. This framework classifies every expenditure as either allowable (reimbursable), allocable (properly assigned to a contract), or unallowable (explicitly excluded from billing).
Unallowable costs — such as entertainment, lobbying expenses, or certain executive compensation — must be segregated in the accounting system before any invoices go to the government. This isn't optional bookkeeping preference; it's a contractual and legal obligation enforced by the Defense Contract Audit Agency (DCAA). For construction firms working on military installations, government facilities, or federally funded infrastructure, these rules apply from the first subcontract award forward.
Indirect cost pools add another layer of complexity. Labor burden, equipment overhead, and general and administrative (G&A) expenses must be accumulated in defined pools and allocated to contracts using DCAA-approved allocation bases — typically direct labor hours, direct labor dollars, or total direct costs.
Construction controllers managing defense work face a compounding challenge: standard job costing logic must coexist with FAR cost accounting requirements. A single project may require tracking both commercial and government-funded scopes simultaneously, each with different allowability rules and documentation standards.
The practical implications are significant:
For a controller, this means standard AP and expense workflows are insufficient. Approval hierarchies must enforce FAR compliance before costs are posted — not after.
Scenario 1 — The misclassification problem: A project manager on a Navy construction contract submits a team dinner receipt coded to Job 4420, Task Order 003. The meal is immediately unallowable under FAR 31.205-14 (entertainment costs). If the expense clears a standard AP approval and posts to the contract, it appears on the next invoice to the government. A DCAA auditor finds it during a forward pricing review. The result: cost disallowance, invoice correction, and a finding in the contractor's audit history.
Scenario 2 — Compliant workflow in practice: A subcontractor field supervisor working on an Army Corps project submits a fuel receipt for a government-use vehicle. The expense is coded to the correct CLIN, linked to the equipment cost pool, and flagged for G&A allocation. The controller's review confirms the date matches timesheet records and the cost is allowable under FAR 31.205-36 (rental costs). The expense posts cleanly and appears on the next SF-1034 billing.
Scenario 3 — Indirect cost pool reconciliation: At month-end, a defense-focused GC reconciles its fringe benefit pool against direct labor charged across five active task orders. Two expense receipts tagged to overhead are reclassified to direct after the project accountant confirms the work was performed on-site. The reallocation shifts costs into billable categories and improves the indirect cost rate for the period.
Defense-focused construction firms increasingly rely on purpose-built platforms that enforce FAR compliance at the point of expense submission — not during month-end review. These systems connect expense capture directly to contract structure, CLINs, and cost pools, so allowability is validated before approval routing begins.
Vergo is a card-agnostic expense management platform built for construction. Connect any corporate or project credit card and get full visibility and control over field spending.
FAR Part 31 disallows costs including entertainment, advertising, certain legal fees, fines and penalties, and portions of executive compensation exceeding benchmark limits. For construction firms, alcoholic beverages at project events, lobbying activities, and interest on borrowed capital are common unallowable categories that must be segregated in the accounting system before any government billing.
The Defense Contract Audit Agency (DCAA) audits contractor accounting systems and incurred cost submissions on behalf of the Department of Defense. For construction contractors, a DCAA audit can examine expense documentation, labor reconciliation, and indirect cost allocation methods. An inadequate system can result in cost disallowance, invoice rejection, or loss of future contract eligibility.
Indirect costs must be grouped into defined pools — fringe benefits, overhead, and G&A are the most common — and allocated using a consistent, DCAA-approved base such as direct labor dollars or total direct costs. The allocation base must be applied uniformly across all contracts in a fiscal year and disclosed in the contractor's accounting system description.
Cost-reimbursable contracts require original receipts or electronic equivalents showing date, vendor, amount, and business purpose. Expenses must link to a specific contract, task order, or CLIN. Labor records for the same period must corroborate travel and field expenses. Blanket or reconstructed expense reports typically fail DCAA floor checks and can trigger broader audit scrutiny.
Standard commercial expense tools lack FAR allowability logic, CLIN-level cost coding, and indirect pool integration. Controllers using generic platforms must manually layer compliance controls on top of the software, increasing error risk. Construction-specific platforms that integrate with job cost and contract structure provide stronger audit trails and reduce the risk of disallowance findings during DCAA review.
Vergo connects expense submission directly to job cost structure, contract line items, and indirect cost pools, enforcing coding accuracy before approval routing. It integrates natively with Deltek, Sage, Viewpoint, CMiC, and other construction ERPs commonly used by defense contractors, eliminating manual rekeying and supporting audit-ready documentation at the receipt level.