Consider a mid-sized MEP (Mechanical, Electrical, Plumbing) firm— a composite of patterns we see regularly: 45 engineers, eight project managers, roughly $18 million in annual revenue. The principals added a chargeability-linked bonus structure in Q1 to address flat productivity metrics. By Q3, chargeability numbers were climbing. The plan was working. Then the quality slips started. By the following spring, two of the firm's most experienced senior PMs had resigned.
The system was working exactly as designed. It just rewarded the wrong behavior.
Tying project manager compensation to chargeability makes intuitive sense for MEP firms— billable hours drive revenue, so rewarding them should drive performance. The problem is that most chargeability bonus plans are built without safeguards, and when strong financial incentives meet an already-strained engineering workforce, the result is burnout, not productivity. Gallup research6 finds that 73% of full-time employees already experience burnout often— before you add a financial incentive to work more hours.
The concept is right. The design is usually wrong. This article walks through what a sustainable plan needs from day one— and why most firms haven't built it yet: role-specific targets, a quarterly burnout audit, protected non-billable time, and a pre-committed incentive structure.
"A PM who burns out is a design failure. The compensation structure is the design."
Chargeability vs. Utilization: The Distinction That Changes Everything
In MEP firms, chargeability and utilization are often used interchangeably— but they measure different things, and the difference matters for how you design a compensation plan.
Chargeability is a payroll metric: direct labor dollars divided by total labor dollars (direct plus indirect)1. It measures what percentage of your total labor cost goes to billable client work. Utilization measures time— hours on productive work as a percentage of available hours. They move together, but they're not the same. On lump-sum contracts, which account for more than half of A&E projects10, a team that finishes ahead of schedule improves profitability. Fewer hours billed doesn't mean less value delivered.
| Chargeability | Utilization | |
|---|---|---|
| What it measures | Payroll dollars on billable work | Hours on productive work |
| How calculated | Direct labor ÷ (Direct + Indirect labor) | Billable hours ÷ Total available hours |
| Best for | Compensation plan design | Capacity planning |
| Watch out for | Lump-sum contract distortion | Salaried overtime invisible in hourly metrics |
The median chargeability across A&E firms broadly sits near 62%1— well below what most firms' compensation plans assume. And the gap between actual and projected chargeability widened from 2.2% to 2.9% between 2024 and 20252. Firms are already underperforming their targets. A compensation plan built on unrealistic baselines makes that gap worse.
There's also the PSMJ paradox to account for: "the most expensive staff members are the least chargeable"1. Principals and senior leaders who drive business development and firm strategy generate less billable revenue than their salaries imply. That's expected— it's how firms grow. But a plan that penalizes this pattern structurally will undermine the people the firm needs most.
Chargeability is the payroll metric. Utilization is the time metric. Your compensation plan should be built on chargeability— and most aren't.
Role-Specific Targets: Why PMs Are Different
Healthy chargeability targets in engineering firms differ meaningfully by role: senior project managers should target 60–70%, technical staff 75–85%, and principals 40–60%3. Setting a single firm-wide target— or holding PMs to technical staff benchmarks— is where most chargeability compensation plans fail.
A senior PM in an MEP firm is carrying two jobs simultaneously. First: a billable technical contributor, performing engineering work directly charged to client projects. Second: a non-billable team manager— coordinating scope, managing client communication, running quality control reviews, developing junior engineers. The second job is real. It's essential. It never shows up on a timesheet as revenue.
Architecture and engineering firms report project managers averaging approximately 88% utilization4. Compare that to the sustainable 60–70% target for senior PMs. That gap— 18 to 28 percentage points above where they should be running— is where burnout lives.
And that gap isn't a performance problem— it's a structural one the comp plan created.
| Role | Target Range | Why Lower Isn't Less Productive |
|---|---|---|
| Junior designers | 75–85% | Primarily billable execution |
| Mid-level staff | 70–80% | Some coordination, mostly billable |
| Senior project managers | 60–70% | Significant non-billable management required |
| Principals | 40–60% | Primarily BD, strategy, firm leadership |
What does 88% actually mean in practice? At that pace, a PM is choosing between billable hours and every non-billable duty the role requires. Training junior staff? Competes with a bonus. Managing scope creep before it becomes a claim? Competes with a bonus. Building the client relationship that earns the next contract? Competes with a bonus. The chargeability number goes up. The quality of project management goes down.
A PM running at 88% utilization isn't a high performer— they're someone who stopped managing.
The Three Design Flaws in Most Chargeability Bonus Plans
Most chargeability-linked compensation plans for AEC project managers share three structural flaws: they set a single firm-wide chargeability target regardless of role, they offer no protection for non-billable time, and they contain no mechanism to prevent effort from compounding across periods until burnout occurs.
- The single-target problem. Firms set one chargeability goal— often 75–80%— and apply it across all staff. PMs, whose sustainable target is 60–70%, now have a financial motivation to operate 15–20 percentage points above their ceiling. PSMJ notes that variables affecting project profitability are often outside the PM's control9— client delays, scope changes, project volume. A plan that ties compensation entirely to individual chargeability attainment penalizes PMs for conditions they didn't create.
- Non-billable time is unprotected. When chargeability determines bonus size, every non-billable activity— mentoring, business development, training, internal QC reviews— competes directly with bonus income. PMs choose billable hours. Stambaugh Ness finds that individual utilization targets are counterproductive because staff cannot control workflow volume10; firm-wide targets are more appropriate for exactly this reason.
- No commit-in-advance structure. This is the design failure most firms miss. University of Kansas research identifies a mechanism called "effort cost spillover"8— exertion in one period reduces capacity in subsequent periods. Strong incentives drive PMs to sprint every quarter. Without a mechanism that allows self-regulation across periods, the plan is structurally guaranteed to produce burnout cycles.
"You're either overincentivizing people and they're working themselves to burn out, or underincentivizing people and they back off." — University of Kansas School of Business research8
And notably: even the leading AEC-specific incentive plan design template from Deltek13 makes no mention of burnout safeguards— the omission appears industry-wide, not firm-specific.
Four Safeguards That Make Chargeability Compensation Sustainable
A chargeability-linked compensation plan that doesn't burn out project managers needs four structural safeguards built in from the start: role-specific targets, a quarterly burnout audit, protected non-billable time, and a pre-committed incentive structure.
Safeguard 1: Role-differentiated chargeability targets. Set distinct targets by role, not a single firm-wide number. Starting point: senior PMs at 60–70%; mid-level staff at 70–80%; junior designers at 75–85%; principals at 40–60%3. Compensation eligibility thresholds should be keyed to the role's target— not a universal ceiling that pushes senior PMs into unsustainable territory by design.
Safeguard 2: The 90-day burnout audit. Every quarter, pull 90 days of billable hour data by person. Flag anyone in a PM or senior role who has averaged above 85% for the period7. That flag triggers a workload conversation— not a performance improvement plan. The system failed, not the person. Sustained above 90% is a red alert: Monograph data confirms burnout cycles activate at that threshold, leading to exhaustion, disengagement, and turnover4. This is a system check, not surveillance.
"The 90-day audit is a system check, not a performance review. If anyone on your PM team has sustained above 85% for three months, the system is doing something wrong."
Safeguard 3: Protected non-billable time. Explicitly allocate non-billable time for each PM role— and exclude it from chargeability calculations. For a senior PM targeting 65% on a 40-hour week: 26 hours billable, 14 hours protected for business development, mentoring, QC, and internal meetings. This is not overhead waste. It's team infrastructure. Protect it in the comp plan so that non-billable hours below threshold don't reduce bonus eligibility.
Safeguard 4: The commit-in-advance structure. Rather than setting new chargeability goals each quarter— which incentivizes sprinting— pre-commit incentive tiers annually. Tell your PMs: "Your bonus tier is set for the year. Your job is to pace yourself to hit it sustainably." University of Kansas research confirms this mechanism allows employees to self-regulate effort across periods, eliminating the sprint-crash cycle8. PSMJ's preferred hybrid model— firm-wide profitability pool plus individual improvement goals— is the structural expression of this principle9.
Pre-committing incentives in advance lets PMs regulate their effort sustainably. It's the difference between sprinting every quarter and running a marathon.
What a Working Plan Looks Like in Practice
The compensation plan structure that most closely matches sustainable chargeability-linked pay in AEC firms is a hybrid model: a portion tied to firm-wide profitability, a portion tied to individual chargeability improvement goals, with PM input into team performance scoring9.
The incentive pool is funded through a firm-wide profitability formula— tiered so higher-margin years produce larger pools13. This decouples "do we have money for bonuses?" from "did this PM hit their target?" Scarcity-year bonus cuts stop feeling punitive when the pool is explicitly tied to firm performance, not individual attainment.
| Component | % of Pool | Tied To | Safeguard It Provides |
|---|---|---|---|
| Firm-wide | ~40% | Firm profitability threshold | Aligns everyone; prevents individual gaming |
| Chargeability improvement | ~35% | Improvement toward role target (not absolute) | Rewards progress, not just peak attainment |
| Non-financial | ~25% | Client satisfaction, timesheet accuracy, team development | Protects qualitative PM duties chargeability can't measure |
These proportions are illustrative. Exact splits vary by firm size, project mix, and existing compensation structure.
The structure above isn't radical. It's what good plan design looks like when you separate firm health from individual hustle.
The chargeability improvement component— ~35% of the pool— rewards movement toward a role-specific target, not absolute attainment. A PM who moves from 55% to 63% chargeability gets credit, even without reaching the full 65–70% senior PM target. Improvement-based metrics give PMs something they can control and grow toward.
PSMJ also recommends giving PMs a role in scoring individual team member performance9. This creates stake in team productivity and encourages delegation— one of the structural behaviors that gets squeezed out when PMs are sprinting for billable hours.
One firm-wide rule applies regardless of plan structure: "Never adjust salaries without also adjusting fees and billing rates"12. Compensation strategy and financial strategy must move together. Separating them is a financial management failure.
Get the design right— then the question becomes what it actually costs to get it wrong.
Why Getting This Wrong in Today's MEP Market Is Expensive
In MEP engineering, open positions regularly outnumber qualified candidates on national job boards11. Losing a project manager to burnout isn't a budget line item— it's a capacity crisis.
Real PM salary growth was 0.61% year-over-year against 2.9% consumer inflation in 20255. Project managers are already losing purchasing power while workloads increase. And 94% of employees report they would stay with a firm longer if it provided learning opportunities7— a data point that confirms development investment isn't a soft benefit, it's a retention mechanism.
Firms that optimize chargeability numbers while burning out the people who generate them are chasing pennies. The PM who leaves doesn't just cost a recruitment fee— it costs months of open capacity, eroded client relationships, and institutional knowledge that took years to build. MEP is not a fungible labor market. The Zweig Group's 2025 benchmarks show the chargeability gap widening to 2.9%2 as firms struggle to hit projections. Burning out the PMs who run those projects will widen that gap further, not close it.
For context on measuring AI ROI and performance benchmarks across professional services firms, the pattern holds: firms that treat people as the primary lever and technology as the amplifier consistently outperform firms that do it the other way around.
Where AI-Assisted Chargeability Tracking Fits (and Where It Doesn't)
Platforms like Deltek, Monograph, and BQE Core have built chargeability tracking into their core product. These tools make the 90-day audit faster— they do not make a poorly designed compensation plan work.
What these platforms can do now is meaningful. In practical terms: pull 90 days of billable hours for every person on the team, flag anyone above 85%, generate role-level reports for a workload conversation— all automated. Trend visualization and threshold alerts can surface trajectory concerns before the 85% threshold is crossed. Genuinely useful for running the safeguards at scale. But they can't decide whether 68% is the right target for a senior PM at this firm. They can't protect non-billable time. They can't pre-commit incentive structures.
The tool executes the plan you design. If the plan has no safeguard, the tool just gives you faster visibility into the damage.
Use these platforms to automate the 90-day audit, generate role-level utilization reports, and surface data for transparent workload conversations. If building AI-enabled workflows for professional services teams is on your roadmap, chargeability tracking is a natural early application— high value, low risk, measurable output. For the design work itself— setting role targets, structuring the incentive pool, aligning fees with compensation— a review of your AI implementation strategy often surfaces structural gaps faster than internal iteration. Pair that with AI-assisted workflow automation once the plan design is sound.
Conclusion
A chargeability-linked compensation plan that doesn't burn out project managers isn't a matter of softer incentives— it's a matter of more precise design.
The firms that get this right reward PM performance without destroying PM capacity. Four things close the gap: role-specific targets (PMs at 60–70%, not firm-wide 75–85%); a quarterly 90-day burnout audit with a flag at 85%; protected non-billable time built into the plan design; and incentive tiers pre-committed annually so PMs can pace sustainably.
Return to the opening scenario. Those two senior PM resignations weren't a hiring problem. They were a design problem. And design problems have solutions. The MEP talent market won't wait, and the PM you burn out won't either.
If you're rethinking how your firm ties compensation to performance— setting the right targets by role, building the pool structure, aligning billing rates with salary decisions— Dan Cumberland Labs works with professional services firms navigating exactly these decisions. Reach out through the strategy page when you're ready to think through the architecture.
Frequently Asked Questions
What chargeability rate should project managers at MEP firms target?
Senior project managers in MEP and AEC firms should target 60–70% chargeability— not the 75–85% range that applies to technical staff3. PMs carry non-billable management duties (team coordination, QC, client communication, junior staff development) that are essential to project success but not directly billable. Setting PM targets at technical staff levels creates financial pressure to neglect those duties. The reported average across A&E firms is approximately 88% for PMs4— the gap between that figure and the 60–70% sustainable range reveals exactly where the problem lives.
What is the difference between chargeability and utilization in AEC firms?
Chargeability measures the percentage of total payroll dollars allocated to billable projects: direct labor divided by total labor (direct plus indirect)1. Utilization measures time on productive work as a percentage of available hours. They move together but aren't identical— especially on lump-sum contracts, which account for over 50% of A&E projects10, where fewer billable hours can actually increase profitability. Compensation plans should be built on chargeability, not raw hours.
How do you prevent PM burnout when tying compensation to chargeability?
Four structural safeguards: set role-specific targets (senior PMs at 60–70%, not a firm-wide 75–85%)3; run a quarterly 90-day burnout audit and flag anyone consistently above 85%7; protect non-billable time in the plan design so it doesn't compete with bonus income; and pre-commit incentive tiers annually so PMs can regulate effort sustainably rather than sprinting every quarter8. University of Kansas research confirms the pre-commitment mechanism specifically breaks the overwork cycle.
Why do most AEC chargeability compensation plans fail?
Most plans use a single firm-wide target that ignores role differences, offer no protection for non-billable time, and contain no mechanism to prevent effort from compounding into burnout. University of Kansas research describes the result as a binary trap8: overincentivize and employees burn out; underincentivize and they disengage. The dominant industry incentive plan template for AE firms makes no mention of burnout safeguards13— confirming the gap is industry-wide, not an outlier.
References
- PSMJ Resources, "Managing Overhead: Utilization versus Chargeability" (2024)— https://go.psmj.com/blog/managing-overhead-utilization-versus-chargeability
- Zweig Group, "2025 Fee + Billing Report of AEC Firms" (2025)— https://zweiggroup.com/products/2025-fee-billing-report
- Factor App, "Understanding Utilization Rates for A&E Firms" (2024)— https://factorapp.com/blog/understanding-utilization-rates-for-a-e-firms
- Monograph, "Utilization Rate Guide for Architecture and Engineering Firms" (2025)— https://monograph.com/blog/utilization-rate
- Monograph, "2025 Engineering Project Manager Salary Guide" (2025)— https://monograph.com/blog/engineering-project-manager-salary-guide
- Gallup, "Employee Burnout: Causes and Cures" (2023)— https://www.gallup.com/workplace/237059/employee-burnout-part-main-causes.aspx
- Stambaugh Ness, "Managing Burnout and Improving Business Performance in the AEC Industry" (2024)— https://www.stambaughness.com/blog/managing-burnout-improving-business-performance-aec-industry/
- University of Kansas School of Business, "Strong Incentives May Lead to Even More Employee Burnout, Research Finds" (2023)— https://business.ku.edu/news/article/strong-incentives-may-lead-to-even-more-employee-burnout-research-finds
- PSMJ Resources, "Project-Based Businesses and Incentive Compensation" (2024)— https://go.psmj.com/blog/project-based-businesses-and-incentive-compensation
- Stambaugh Ness, "Common Misconceptions About Utilization Rate for AE Firms" (2024)— https://www.stambaughness.com/blog/misconceptions-about-utilization-rate-ae-firms/
- Monograph, "MEP Engineer Salary Guide 2025" (2025)— https://monograph.com/blog/mep-engineer-salary-guide-2025
- PSMJ Resources, "How Total Compensation Strategies Boost Talent in AEC Firms" (2024)— https://go.psmj.com/blog/how-evolving-total-compensation-strategies-drive-talent-success-in-the-aec-industry
- Deltek, "Performance-Based Incentive Compensation Plans for AE Industry" (2024)— https://www.deltek.com/resources/articles/performance-based-incentive-compensation-plans-for-ae-industry/
