A/E Accounting for
‍Architecture and Engineering Firms

The Accounting Problem Most A/E Firms Don't Know They Have

Ask a principal at an architecture or engineering firm whether their books are set up correctly and the answer is almost always yes.

Then ask them their overhead factor.

Most cannot answer. Not because they haven't tried — because their accounting system was never configured to make the calculation possible.

The problems are structural and consistent across firms:

• All payroll sits in one expense account — direct labor and overhead labor lumped together — making it impossible to separate the costs that drive the overhead factor calculation
• Consultants and direct expenses may or may not be in COGS — depending on how the chart of accounts was set up — distorting net revenue and making project-to-project profitability comparisons unreliable
• Job costing is either missing or limited to project-level totals without phase-level visibility
• Overhead factor is either unknown, estimated from industry averages, or calculated incorrectly from a P&L structure that wasn't designed to support it

These are not minor inefficiencies. They are the accounting foundation that every other financial metric depends on. A firm that cannot calculate its overhead factor cannot price work correctly, cannot set defensible billing rates, and cannot know whether its projects are actually profitable until it's too late to do anything about it.

The fix is not switching accounting software. It is understanding how A/E firm books should be structured — and making the adjustments that most generic accountants never knew to suggest.

Why A/E Firm Accounting Is Different — and Why Generic Setup Fails

Architecture and engineering firms are project-based professional services businesses. Their accounting needs reflect that in ways that generic bookkeeping guidance — and generic accountants — consistently miss.

The three structural differences that matter most:

Consultant pass-throughs distort revenue if not handled correctly. When a firm bills $500,000 to a client and $200,000 of that is a consultant pass-through, the firm's actual revenue is $300,000. Firms that include pass-through amounts in their revenue base are measuring performance against a number that includes money that was never theirs. Net revenue — gross revenue minus consultants and direct expenses — is the correct denominator for every profitability metric.

Labor costs must be separated by type. In a retail business or a simple service firm, payroll is payroll. In an A/E firm, labor splits into two fundamentally different categories: direct labor charged to projects, and overhead labor that supports the firm's operations. Those two numbers need to be visible separately — because the ratio between them is the overhead factor, and the overhead factor is the foundation of every fee calculation, billing rate, and profitability measurement the firm makes.

Phase-based project structure requires phase-based job costing. A/E projects are not single transactions. They are multi-phase engagements where each phase has its own fee, its own team, and its own profitability. Accounting systems that capture costs at the project level — without phase visibility — cannot tell a firm whether its construction documents phase is running over budget while its schematic design phase was profitable. Phase-level job costing requires a project management system, not just an accounting package.

What Your Books Should Actually Look Like

The correct P&L structure for an A/E firm organizes income and expenses in a way that makes net revenue visible and the overhead factor calculable. Most firms don't have this structure — because nobody told them they needed it.

Income: Design services and other income flow here as gross revenue.

Cost of Goods Sold: Consultant fees and direct project expenses — permit fees, printing, travel billed to clients — belong in COGS. Direct labor does not. When direct labor sits in COGS, net revenue becomes impossible to calculate cleanly, and the overhead factor calculation requires working backwards through the P&L.

Gross Profit: This is net revenue — what the firm actually retains after paying for consultants and direct project expenses. It is the correct denominator for all profitability ratios.

Expenses: Two separate payroll lines are essential: Payroll Direct (hours charged to projects) and Payroll Overhead (administrative, marketing, and management time). All other overhead expenses — rent, insurance, subscriptions, professional development — sit here as well.

With this structure in place, the overhead factor calculation is straightforward:

Total Expenses minus Direct Labor equals Overhead. Overhead divided by Direct Labor equals the Overhead Factor.

A real example: a firm with $809,625 in total expenses and $310,000 in direct labor has overhead of $499,625 and an overhead factor of 1.61. That means every dollar of direct labor carries $1.61 in overhead — and every fee, billing rate, and profitability target the firm sets needs to account for that ratio.

→ Read: Overhead Factor Explained: The Missing Link Between Busy and Profitable

→ Read: Stop Measuring Profit the Wrong Way

Why QuickBooks Doesn't Do This Automatically — and What BQE Gets Wrong

QuickBooks is the accounting system most A/E firms use. It is not built for A/E firms.

By default, QuickBooks puts all payroll into a single expense account. Direct labor and overhead labor are indistinguishable. The overhead factor cannot be calculated without manual workarounds. Job costing is limited to project totals rather than phase-level visibility. The chart of accounts defaults are built for retail and generic service businesses — not for firms that need to separate net revenue from gross revenue on every project.

None of this is a reason to switch accounting software. QuickBooks can support the correct A/E accounting structure when it is set up correctly. The problem is that most firms were never told how to set it up — and their accountants, working from generic small business best practices, didn't know to ask.

BQE Core has internal accounting but approaches overhead differently. Its suggested method is to inflate employee labor rates to approximate overhead — embedding the overhead cost into the labor rate rather than tracking it separately. The consequence is that direct labor costs become invisible as real numbers, the overhead factor becomes uncalculable as a meaningful ratio, and project-to-project financial comparisons lose accuracy because the labor costs embedded in each project aren't based on actual payroll figures.

Monograph has no internal accounting at all. It integrates with QuickBooks Online and inherits all of its limitations — including the inability to calculate an overhead factor without correct setup that Monograph itself cannot guide or enforce.

BaseBuilders takes a different approach. Rather than replacing the firm's accounting software, it runs a report that separates payroll dollars into direct labor and overhead labor — giving the firm the exact figures needed to calculate the overhead factor and make the necessary journal entry in QuickBooks or Xero. The accounting package handles the books. BaseBuilders handles the A/E-specific financial intelligence the accounting package was never designed to provide.

→ See: BaseBuilders vs Monograph

→ See: BaseBuilders vs BQE Core

See How the Numbers Work in Practice

BaseBuilders has produced a series of short video explainers that walk through the overhead factor calculation and its application to A/E firm pricing and profitability — using real P&L figures and real firm examples.

Overhead Factor Explained: The Missing Link Between Busy and Profitable.
How to calculate your overhead factor from a 12-month P&L and what the number actually means for your firm's financial health.

Calculate True Project Cost with Your Overhead Factor
‍How to apply overhead to direct labor, calculate total project cost, and see profit by project — not just by firm.

The 3.0 Rule: Why Your Projects Aren't as Profitable as You Thinkr
What net multiplier means, how overhead factor drives it, and what the number tells you about whether your

Stop Measuring Profit the Wrong Way
‍Why gross revenue distorts profitability measurement — and how net revenue gives you a number you can actually manage against.

Related Resources

A/E firm accounting doesn't stand alone. These guides connect the books to the financial decisions that flow from them.

Financial Metrics for A/E Firms
‍Overhead factor, net multiplier, utilization rate, and operating profit — the KPIs that tell you whether your firm is performing or just busy.

Proposals & Fees for A/E Firms
‍How overhead factor and billing rates built from real cost data produce fees the firm can actually deliver at a profit.

Billing & Profitability for A/E Firms
‍How the books connect to billing — and why the accounting structure determines whether profitability reporting reflects reality.

Project Management for A/E Firms
‍How phase-level project structure creates the job costing visibility that accounting software alone cannot provide.