WFM guideCapacity planning

Contact centre shrinkage management

Q: What is a realistic shrinkage target for a contact centre?

Realistic shrinkage targets vary by operation type. For a standard voice contact centre with Monday–Friday daytime hours: external (unplanned) shrinkage of 8–12% and internal (planned) shrinkage of 10–14%, producing a total shrinkage of 18–26%. For a 24/7 operation with complex scheduling: external shrinkage of 10–15% (higher absence in unsociable hours, higher attrition-driven absence) and internal shrinkage of 12–18% (more training and handover time required), producing a total of 22–33%. Benchmarks from Loaker and Contact Babel typically show UK contact centres running 25–35% total shrinkage, with well-managed operations in the 22–27% range. A shrinkage of below 20% is achievable but usually indicates under-investment in training and development (internal shrinkage is being suppressed). A shrinkage consistently above 35% indicates absence management or operational design problems.

A centre that manages total shrinkage as a single number will chase the wrong things. A centre that manages absence, late starts, training, and break overruns separately will find that most of the leverage sits in 2–3 specific components.

Shrinkage components: external and internal

External shrinkage is unplanned time away from work (absence, late starts, system outages). Internal shrinkage is planned, sanctioned non-contact time (leave, training, meetings). Both reduce available capacity and must be built into the planning model — but they are managed differently and have different typical rates.

External shrinkage (unplanned)

Component	Typical rate	Controllable?	Management lever
Sickness absence	4–8%	Yes	Return-to-work interviews, Bradford Factor monitoring, wellbeing programme, occupancy management (high occupancy drives stress-related absence)
Unauthorised absence / late starts	0.5–2%	Yes	Defined and consistently applied lateness policy; TL immediate intervention on pattern; root cause analysis for repeat patterns
Attrition-related absence (notice periods, AWOL)	0.5–2%	No	Reduce attrition to reduce pipeline — the absence itself is not the root cause; address voluntary attrition drivers
System outages (unplanned)	0.5–2%	No	Not directly controllable by WFM — report to IT with business impact quantification (contacts lost = outage duration × forecast contact rate)

Internal shrinkage (planned)

Component	Typical rate	Controllable?	Management lever
Approved annual leave	8–12%	Yes	Leave planning model — distribute leave to low-volume periods; enforce minimum staffing floors; reduce leave liability build-up through proactive leave management
Team meetings and briefings	0.5–1.5%	Yes	Schedule meetings in off-peak intervals; stagger by team to maintain coverage; include in the planning model (do not treat as zero-cost)
Training and development	2–5%	Yes	Training scheduling should be treated as a capacity event — booked in advance, included in the planning model, concentrated in low-volume periods
1-to-1s and coaching sessions	0.5–1.5%	Yes	Schedule 1-to-1s at the same frequency for all agents; include in planning model; do not cancel coaching when queue builds (it creates a pattern that cancels all development time)
Non-call activities (admin, case management)	1–3%	Yes	Define the expected non-call activity allocation in the planning model; measure actual vs. planned; alert when actual significantly exceeds planned

The danger of suppressing internal shrinkage

The shrinkage reduction trap

A centre under pressure to reduce shrinkage often targets the most visible internal components: training sessions are cancelled when queues build, team meetings are skipped, 1-to-1s are deferred. Total shrinkage falls. Headcount requirement appears to drop. The operation looks more efficient on paper.

The medium-term consequences are predictable:

— Knowledge gaps widen as product updates are not trained
— FCR declines as agents handle unfamiliar contact types without support
— AHT rises as agents spend longer on each call without confidence
— Agent engagement falls as development is visibly deprioritised
— Attrition rises, increasing the external shrinkage that was being suppressed internally

Internal shrinkage represents investment in capability. Sustainable shrinkage management reduces external shrinkage (primarily absence) while protecting internal shrinkage as a planned, budgeted capacity cost.

Shrinkage management questions

What is a realistic shrinkage target for a contact centre?

For a standard voice contact centre with Monday–Friday daytime hours: external shrinkage 8–12%, internal shrinkage 10–14%, total 18–26%. For a 24/7 operation: external 10–15%, internal 12–18%, total 22–33%. UK industry benchmarks typically show 25–35% total shrinkage, with well-managed operations in the 22–27% range. Below 20% usually indicates under-investment in training and development (internal shrinkage being suppressed). Consistently above 35% indicates absence management or operational design problems.