Margin / Gross Margin

Gross margin in professional services is the revenue from an engagement minus the direct costs of delivering it, expressed as a percentage of revenue, measuring engagement-level profitability before overhead and sales costs are applied.

A project generating $200,000 in revenue with $120,000 in delivery costs has a gross margin of 40%, meaning $0.40 of every dollar billed is available to cover firm overhead and generate profit.

The formula

Gross margin (%) = (Revenue - Direct delivery costs) / Revenue x 100

Direct delivery costs in a services firm are primarily the blended cost of staff time on the engagement, including salaries, benefits, and direct subcontractor fees. Unlike product businesses, services firms carry minimal cost of goods sold outside of labor.

Gross margin vs. net margin

Gross margin reflects only direct delivery costs. It is the engagement-level view.

Net margin deducts all operating expenses, including office, G&A, sales and marketing, and leadership overhead. It is the firm-level view.

Professional services firms manage gross margin at the project and practice level, and net margin at the business unit or firm level.

What erodes gross margin

• Scope creep that inflates delivery cost without a corresponding increase in revenue.
• Write-offs that reduce collected revenue without reducing hours delivered.
• Seniority mix drift: using more senior staff than was priced.
• Subcontractor cost overruns on fixed-fee engagements.
• Low realization caused by discounting or unbilled hours.

Margin leakage describes the cumulative effect of these pressures eroding margin below the target set at quoting.

Tracking margin at the engagement level

Gross margin is most useful when tracked per engagement from the point of quoting, not only at close. Comparing the margin modeled at the estimate stage against the margin realized at engagement close-out reveals where and why profitability diverged from the plan.

Persistent divergence between quoted and realized margin points to systemic issues: an estimating bias, a rate card misaligned with actual cost, or a pattern of scope growth that is not captured through change orders. Reviewing this gap at the practice level, rather than the individual engagement level, produces the most actionable findings.

Benchmarks by firm type

These ranges reflect typical gross margin targets, not guaranteed outcomes, and vary by geography, firm size, and delivery model:

• Pure advisory and management consulting: 40 to 55%
• Technology implementation: 28 to 42%
• Managed services: 22 to 35%
• Staffing: 15 to 25%