Billable hours are time worked on client engagements that is charged to the client — directly linked to revenue. Non-billable hours are working hours spent on activities that do not generate direct client revenue: business development, internal meetings, training, administration, and firm management. For professional services firms, the ratio of billable to total hours is the utilization rate — the primary operational efficiency metric. Industry benchmarks: client-facing staff should target 65–80% billable, with the remaining 20–35% allocated to non-billable investment in firm growth and operations.
Not all time is clearly billable or non-billable. Contract terms govern edge cases like travel, proposal work, and internal review cycles. The table below covers typical treatment across most professional services engagements.
| Category | Billable | Non-Billable |
|---|---|---|
| Project execution work | ✓ | — |
| Client calls and meetings | ✓ (if in scope) | ✓ (relationship calls) |
| Deliverable preparation | ✓ | — |
| Internal review cycles | Depends on contract | — |
| Business development / sales | — | ✓ |
| Proposal and RFP writing | — | ✓ |
| Internal meetings | — | ✓ |
| Training and development | — | ✓ |
| Administrative tasks | — | ✓ |
| Bench time / between projects | — | ✓ |
| Travel time | Depends on contract | — |
A real-numbers walkthrough of billable vs non-billable hour allocation for a mid-size agency.
A 20-person marketing agency tracks hours for the month of March. Total working hours across 15 billable staff: 2,400 hours.
Breakdown: Client project execution = 1,680 hours (70%); Internal agency meetings = 240 hours (10%); Business development = 180 hours (7.5%); Training and development = 120 hours (5%); Administrative = 180 hours (7.5%).
Billable utilization = 1,680 ÷ 2,400 = 70%. The 30% non-billable allocation is within the healthy range.
However, if the BD allocation were 15% and training 3%, the shift suggests the agency is investing more in pipeline — a leading indicator of future revenue growth.
Non-billable allocation varies significantly by seniority. Applying a single utilization target to all roles creates perverse incentives for senior staff.
| Role | Typical Billable % | Typical Non-Billable % | Note |
|---|---|---|---|
| Junior / Staff | 75–85% | 15–25% | Mostly billable ESTIMATE |
| Mid-level Consultant | 68–78% | 22–32% | Growing BD responsibility ESTIMATE |
| Senior Consultant / Manager | 55–70% | 30–45% | Significant BD + management ESTIMATE |
| Principal / Director | 40–60% | 40–60% | Heavy management + origination ESTIMATE |
| Partner / Owner | 20–50% | 50–80% | Primarily business generation ESTIMATE |
Time spent on proposals, capability presentations, and pre-sales scoping is rarely recoverable from the client. Logging it as billable inflates utilization figures and creates billing disputes.
Firms that only log billable time have no visibility into where non-billable time goes. Without this data, you can't optimize BD investment, reduce meeting overhead, or identify staff who are chronically under-deployed.
A 75% utilization target for a Director/Principal will starve BD and management. Role-appropriate targets prevent perverse incentives where senior staff neglect firm-building activities to hit personal billable targets.
The billable/non-billable split is a window into firm health beyond utilization rates. High non-billable time in BD signals pipeline investment; high non-billable time in administration signals operational inefficiency.
Acquirers look at how non-billable time is allocated — a firm where 15% of total hours are in sales and BD typically has healthier revenue diversification than one where 15% is in internal meetings.
Improving billable utilization from 65% to 72% across 20 staff adds over $700K in annual revenue at $100/hr effective rate.
The free ProServ Health Assessment scores your operational health in 5 minutes. Then see every metric calculated with your own numbers.