Utilization rate and chargeability rate formulas, target ranges for staff, managers, and partners, billable vs. non-billable hour classification, and budget-to-actual variance tracking.
Utilization & Chargeability for Accounting Firms
Utilization rate and chargeability rate get used interchangeably in most firms, which is usually fine — until you're comparing your number against a published "chargeable hours benchmark" and the definitions don't match. The formulas below settle that, and the benchmarks tell you what target range actually matters for each role.
Utilization rate = billable hours ÷ total available hours.
Utilization rate is capacity-based: the denominator is every hour a staff member is available to work, including PTO and holidays. It answers "of all the time we're paying for, how much converted to billable work?" — billable utilization is the number finance and firm administrators typically track.
Chargeability rate = billable hours ÷ total hours actually worked.
Chargeability rate is activity-based: the denominator excludes PTO and holidays, counting only hours actually logged. That makes chargeability rate read a few points higher than utilization rate for the same person doing the same work — worth knowing before you compare your firm's number against someone else's.
The classification both formulas depend on.
Billable hours are time directly chargeable to a client engagement; non-billable hours cover training, business development, internal admin, and firm management. Get this classification wrong at time entry — a common failure point — and every downstream utilization and chargeability number is wrong too, regardless of which formula you use.
Staff: 80%+. Directors/managers: 55–70%. Partners: 40–55%.
Utilization benchmarks differ by role because directors, managers, and partners carry heavier supervision, review, and business development loads that don't convert to billable time. Comparing a partner's utilization against a staff accountant's target range will always look like a problem that isn't actually there.
A leading indicator, not just a project management metric.
Budget vs. actual hours compares the hours budgeted at engagement acceptance to what was actually logged. Rising budget-to-actual variance on a service line often shows up weeks before it drags down that service line's realization rate — it's an earlier warning than realization itself.
Averages hide overload; individual tracking doesn't.
A staff utilization dashboard and employee utilization reporting that only shows the firm-wide average will miss the problem that matters most: a handful of staff running well above target while the average looks fine. Tracking distribution variance, not just the average, is what actually catches overload before burnout does.
| Role | Best-in-Class Target | Warning Threshold | Review Cadence |
|---|---|---|---|
| Staff Accountants | 80%+ chargeable | Below 60% or above 95% sustained | Weekly |
| Directors & Managers | 55–70% chargeable | Below 55% or above 75% sustained | Weekly |
| Partners | 40–55% chargeable | Below 35% sustained | Monthly |
| Budget-to-Actual Variance | Within 10% of budgeted hours | Over 20% variance on a service line | Per engagement, reviewed monthly |
FirmMetrics™ surfaces the firm-wide utilization and chargeability KPI from CCH Practice or Practice CS, benchmarked against target by role. WorkSight Metrics™ goes a level deeper for firms running CCH Workflow — a staff productivity dashboard showing workload distribution by person and team, so a manager can see overload before it shows up as a firm-wide number.
For the full benchmark set across realization, utilization, WIP, and AR, see our Accounting Firm KPI Benchmarks guide.
Target chargeable utilization is 80%+ for staff accountants and 55–70% for directors and managers, including tax managers. Directors and managers carry heavier supervision, business development, and administrative loads, so their utilization runs lower than staff. Partners typically run 40–55% chargeable depending on firm size and business development expectations.
Utilization rate = billable hours ÷ total available hours, including PTO and holidays in the denominator. Chargeability rate = billable hours ÷ total hours actually worked, excluding PTO and holidays. Chargeability rate typically reads a few points higher than utilization for the same person.
Billable hours are time directly chargeable to a client engagement. Non-billable hours cover training, business development, internal administration, and firm management. Accurate classification at time entry is the foundation both utilization and chargeability formulas depend on.
The same role-based ranges apply to chargeability as utilization, adjusted a few points higher: roughly 80%+ for staff, 55–70% for directors and managers, and 40–55% for partners, since chargeability's smaller denominator (worked hours, not available hours) pushes the percentage up slightly for the same billable workload.
Utilization and chargeability measure how much of a person's time is billable. Budget vs. actual hours measures something different: whether a specific engagement is taking more hours than planned, regardless of how billable those hours are. Rising variance on a service line is often the earliest warning sign of a realization rate problem forming.