Construction Overhead Costs and Allocation

Your job costing system says you made money on that hospital addition, but your bank account tells a different story. If this sounds familiar, you’re probably wrestling with construction overhead. Those indirect costs eat profits when they’re not tracked and allocated properly.

Understanding Construction Overhead and Indirect Costs

Construction overhead falls into two buckets: general overhead and project overhead. General overhead covers what keeps your business running: office rent, accounting staff, estimators, insurance premiums and marketing. Project overhead sits somewhere between direct costs and general overhead. Think site trailers, project-specific supervision, temporary utilities and safety equipment that serves multiple crews on the same job.

The distinction matters because how you classify and allocate these costs directly impacts bid accuracy and financial reporting. Misclassifying project supervisors as direct labor instead of overhead, or lumping legitimate project costs into general overhead, distorts job profitability and makes year-end numbers impossible to reconcile with actual results.

Overhead allocation isn’t one-size-fits-all. Under GAAP, contractors using the percentage-of-completion method are expected to include a reasonable allocation of indirect costs in their contract accounting, consistent with guidance under ASC Topic 606. But you still need to choose an allocation method that reflects how your company actually operates.

Choose the Right Allocation Method

Most contractors allocate overhead using one of three approaches: percentage of direct labor, percentage of total direct costs or rate per labor hour. Each has trade-offs.

Percentage of direct labor works well if labor drives most of your overhead expenses. But if you’re running equipment-heavy projects alongside labor-intensive ones, this method distorts profitability. A sewer project with massive equipment costs and minimal labor ends up looking more profitable than it really is.

Percentage of total direct costs spreads overhead across labor, materials and equipment proportionally. This approach makes sense when your overhead doesn’t correlate strongly with any single cost driver. The downside is that material-heavy jobs can absorb overhead charges that don’t reflect actual overhead consumption.

Rate per labor hour ties overhead to worker hours on site. This method works well when your supervisory costs, equipment depreciation and other overhead genuinely scale with hours worked. It falls short when you have significant fixed costs that don’t vary with labor.

Get Your Overhead Rate Right

Your overhead rate calculation starts with knowing your true overhead costs. Pull your general ledger and categorize everything that isn’t direct labor, direct materials or direct equipment for specific jobs. Don’t overlook payroll taxes on overhead employees, depreciation on office assets and the portion of owner compensation that represents administrative work.

Once you have total overhead, divide it by your chosen allocation base. If you’re calculating based on last year’s financials, use actual numbers. For the coming year, you’ll need to estimate both overhead costs and the allocation base using realistic revenue projections.

This is where contractors get into trouble: setting overhead rates in January based on optimistic revenue forecasts, then wondering why they’re underwater by September when actual volume falls short. Build in conservatism. Collecting slightly more overhead than you need is far less painful than underpricing jobs.

The IRS Construction Industry Audit Technique Guide provides specific guidance on which indirect costs are allocable to contracts under the percentage-of-completion method, including the distinction between costs that must be allocated and those that generally are not.

Make Allocation Work in Practice

The best overhead allocation system means nothing if you don’t monitor it. Compare actual overhead expenses to what you’re collecting through job allocations every month, not once a year. If you’re consistently over or under-collecting, adjust your rates quarterly rather than waiting for year-end.

Project types matter too. Municipal work involving significant estimating and administrative time may consume overhead very differently than standard private commercial projects. A single overhead rate applied across dramatically different project types produces winners and losers you never intended.

Your job costing software should track allocated overhead separately from actual costs. This visibility lets you spot problems early. For a deeper look at how overhead fits into the broader framework, the overview of construction job costing methods covers the full range of approaches and how to select the one that fits your operation. The IRS tangible property regulations are also worth reviewing, since decisions about whether costs are capitalized or expensed directly affect what ends up in your overhead pool. And for how overhead allocation connects to the broader accounting fundamentals, the guide to construction contracts accounting basics ties it all together.

Getting construction overhead allocation right takes upfront work, but the payoff is real: more accurate bids, clearer job profitability and better decisions about which work to pursue. James Moore’s construction team helps contractors design allocation methods that fit how they actually operate. Contact a James Moore professional to get started.

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