Billable Utilization Fell to a 19-Year Low. The Top Firms Went the Other Way.

Employee billable utilization across professional services hit 66.4% in 2025, the lowest ever recorded, while the highest-maturity firms grew revenue and profit at more than double the rate of everyone else.

Employee billable utilization across professional services organizations fell to 66.4% in 2025, the lowest level in nineteen years of benchmarking by SPI Research. It sits 3.6 points under the 70% floor SPI treats as the minimum healthy threshold, and it happened in a year the same data set describes as a recovery.

That combination is the whole problem. Revenue growth improved to 5.2%. Project margins reached a five-year high of 37.7%. Revenue leakage fell to a five-year low of 4.5%, and 90.1% of firms hit their revenue targets. Nearly every commercial metric moved the right way. The share of paid staff hours that reached a client invoice moved the wrong way, again.

Four measurements, one direction

Utilization was 73.2% in 2021. It fell to 70.7% in 2022, to 68.9% in 2024, and to 66.4% in 2025. Embedded services organizations fell harder, from 69.0% to 64.9%. Four measurements spanning a demand collapse and a demand recovery, all pointing the same way.

If utilization tracked demand, the 2025 rebound would have pulled it back up. It did not. Headcount grew only 2.8% while revenue grew 5.2%, so more work moved through a workforce that barely expanded, and revenue per employee climbed 6% to $168,000. Output rose. The billable share of the hour fell. The hours went somewhere, and they did not go to clients.

What the top group did differently

SPI’s high-performance organizations posted more than double the revenue growth of the rest of the market, substantially higher billable utilization, and more than double the profitability. They are competing for the same engagements, hiring from the same pool, and quoting against the same rate pressure.

The differentiators SPI names are operational: leadership alignment, workforce planning, service execution controls, and deeper integration of core business systems. That last one carries a number. High-performance organizations connect their services platform to their core financial management system at 64.6%, against 53.1% for everyone else, a gap of 11.5 points. Simply owning a services automation platform is worth 2.9 points of utilization, 66.4% for users against 63.5% for non-users.

Software ownership is close to a rounding error. The connection between the software and the money is four times larger.

What the missing hours are actually doing

Most operations leaders read a utilization decline as a pipeline problem and answer it with sales pressure or a hiring freeze. The 2025 data closes that explanation. Demand recovered and utilization still fell, which puts the constraint inside the firm.

Non-billable hours in a professional services firm are not idle hours. They are administrative hours: chasing engagement documents, re-keying data between a practice management system and the accounting ledger, assembling client reports by hand, following up on aged invoices, reconciling time entries at month end. None of it is optional and none of it is billable. When systems do not talk to each other, a senior person becomes the integration layer, and the firm pays fee-earner rates for clerical throughput.

The arithmetic on 3.6 points

Take a 40-person firm at the benchmark average of $168,000 in revenue per employee. That is $6.7M. Moving utilization from 66.4% to the 70.0% healthy floor is a 5.4% increase in billable output at identical headcount and identical rates, roughly $360,000 a year. Hold the gap for three years and the running total passes $1M, before a single rate increase and without one new hire.

That number is not a projection about AI. It is the cost of hours the firm already pays for and cannot bill.

How CXO Solves This

CXO does not sell a tool for the firm to adopt. We build, deploy, and operate agentic workflow systems configured to the firm’s own processes, systems, and compliance requirements.

Financial Back-Office Operations takes the administrative production layer off fee-earners: AP and AR processing, invoice extraction, purchase order matching, payment workflows, and compliance documentation run end to end rather than in the gaps between client work. Systems Connectivity and Integration closes the gap SPI measures, with agents reading and writing across practice management, accounting, and CRM so no person is the bridge. Reporting and Intelligence Automation delivers KPI monitoring, anomaly detection, and executive reporting on a schedule, which means utilization and project margin are current rather than reconstructed after the quarter closes.

The sequencing matters. We map the operation first and automate against a measured baseline, because a firm that cannot see where its non-billable hours go cannot prove it recovered any.

Utilization has fallen in every measured year since 2021, and the firms at the top of the benchmark separated further in each of them. At a 40-person firm, 3.6 points is roughly $360,000 a year, and the gap does not close on its own. It closes when the administrative load stops sitting on billable staff.

In most operations, far more work can be automated than leadership realizes. One discovery call is enough to size what automating it would return to your bottom line. Book it at https://cxocorporation.com/contact.