The Real Cost of Running a Contact Centre in 2026: A Line-by-Line Decomposition
Aashi Garg 
Ask any contact centre manager what their cost per call is, and they’ll give you a number. It’ll be somewhere between £4 and £12, depending on the industry. They’ll say it with confidence.
Ask them how that number was calculated, and you’ll get silence. Or a vague reference to “industry benchmarks.” Or a formula that divides total contact centre budget by total calls — which is about as useful as dividing your entire grocery bill by the number of items to understand what you spend on steak.
The real cost per call is not a single number. It’s a stack of 15+ line items, many of which are invisible in the monthly P&L because they’re buried in HR, IT, facilities, and recruitment budgets. When you pull them apart and lay them out honestly, the number is almost always higher than what leadership believes — and the opportunity for AI-driven cost reduction is almost always larger than anyone has modelled.
This article decomposes the fully-loaded cost per call for a mid-market contact centre, line by line. No hand-waving. No “industry average” shortcuts. Every line item justified, every assumption stated.
Layer 1: Direct Labour (The Number Everyone Knows)
This is the starting point — the cost that appears on spreadsheets and gets discussed in budget meetings.
Agent base salary. In the UK, a Tier 1 contact centre agent earns £22,000–£28,000 per year depending on location, industry, and experience. In the US, the equivalent range is $30,000–$40,000. For an ISP support team, the midpoint is roughly £25,000 / $35,000.
Employer’s National Insurance / payroll taxes. In the UK, employer’s NI adds approximately 13.8% above the earnings threshold. For a £25,000 salary, that’s roughly £2,500/year. In the US, payroll taxes (FICA + state) add 8–12%. This line item is frequently omitted from cost-per-call calculations.
Pension / retirement contributions. UK auto-enrolment requires a minimum 3% employer contribution: £750/year on a £25,000 salary. US 401(k) matching varies but typically adds 3–6% to labour cost.
Holiday pay and statutory leave. UK agents receive minimum 28 days paid leave (including bank holidays). That’s approximately 5.5 weeks of paid non-productivity — roughly 10.6% of the annual salary as cost without output. In the US, PTO is typically 2–3 weeks, but sick days and holidays add similar cost.
Subtotal — direct labour cost per agent: £30,000–£35,000 (UK) / $42,000–$50,000 (US) when you include NI/taxes, pension, and paid leave.
Direct labour cost per call: At 10,000–12,000 calls handled per agent per year (accounting for working days minus leave, training, and absence), direct labour alone costs £2.50–£3.50 per call. This is the floor — and it only covers the person sitting in the chair.
Layer 2: The Platform Stack (The Number IT Knows)
Your agents don’t answer calls using a telephone and a notepad. They sit inside a technology stack that costs real money.
CCaaS platform licensing. NICE CXone, Genesys Cloud, Five9, Talkdesk, or RingCentral. Per-seat pricing ranges from £80–£200/month depending on the tier and features. For a 20-seat centre: £1,600–£4,000/month, or £19,200–£48,000/year.
Telephony / SIP trunk costs. Inbound call minutes, DID numbers, and trunk licensing. For a centre handling 8,000 calls/month at average 4.5-minute duration: roughly £600–£1,200/month.
CRM licensing. Salesforce Service Cloud, HubSpot, Zendesk, or similar. Per-agent licensing: £50–£150/month. For 20 agents: £1,000–£3,000/month.
QA / quality monitoring tools. Conversation analytics, call recording, screen recording. £20–£60/agent/month. For 20 agents: £400–£1,200/month.
Workforce management (WFM). Scheduling, forecasting, adherence monitoring. £15–£40/agent/month. For 20 agents: £300–£800/month.
Knowledge base / FAQ platform. Internal knowledge management for agents. £200–£500/month for the tool, plus content maintenance time.
Subtotal — platform cost per year for 20 seats: £40,000–£80,000. Divided across 200,000 annual calls (20 agents × 10,000 calls each): £0.20–£0.40 per call. This seems small per-call, but it’s £40K–£80K per year that doesn’t scale down when AI handles half the volume. These are largely fixed costs.
Layer 3: Management and Overhead (The Number Nobody Counts)
Agents don’t manage themselves. Every contact centre has a management layer whose cost is rarely allocated to the per-call metric.
Team lead / supervisor. Typically 1 team lead per 8–12 agents. Salary: £32,000–£45,000 fully loaded. For a 20-seat centre, you need 2 team leads: £64,000–£90,000/year.
Contact centre manager. 1 per centre. Salary: £45,000–£65,000 fully loaded.
Training staff / L&D coordinator. Part-time or shared resource. Allocated cost: £10,000–£20,000/year.
HR allocation. Recruitment, onboarding paperwork, performance management, disciplinary processes. Estimated allocation for a 20-seat centre: £15,000–£25,000/year.
Subtotal — management overhead per year: £134,000–£200,000. Per call: £0.67–£1.00. This is the layer that most cost-per-call calculations completely omit — and it’s nearly a pound per call.
Layer 4: Attrition (The Number That Makes the CFO Wince)
Contact centre agent turnover in the UK runs between 25% and 45% annually, with ISP and telecom support tending toward the upper range. In the US, the numbers are comparable or worse.
For a 20-seat centre with 35% annual attrition, you’re replacing 7 agents per year. Each replacement incurs:
Recruitment costs. Job board fees, recruiter time, interview scheduling, reference checks. Per hire: £2,000–£4,000.
Training costs. 4–8 weeks of onboarding before a new agent handles calls independently. During ramp-up, they are at 40–60% productivity. Fully loaded training cost per agent (trainer time + reduced output + materials): £3,000–£6,000.
Lost productivity during the gap. From resignation to replacement being fully ramped: 6–10 weeks. During this period, remaining agents handle overflow, increasing their workload and accelerating their burnout.
Quality degradation during ramp. New agents have longer handle times, higher transfer rates, and more repeat calls. The cost is diffuse but real — each poorly handled call increases the probability of churn, escalation, and complaint.
Subtotal — annual attrition cost for 20-seat centre: 7 replacements × £5,000–£10,000 per cycle = £35,000–£70,000/year. Per call: £0.18–£0.35.
And this understates the true cost, because it doesn’t account for the cascade effect: overloaded agents burn out faster, driving additional attrition beyond the baseline rate.
Layer 5: Facilities and Infrastructure (The Number That’s “Not Our Budget”)
Desk space. Office rent allocated per seat. In a UK regional city: £3,000–£5,000 per desk per year. London: £8,000–£15,000. For 20 desks: £60,000–£100,000/year (UK regional) or substantially more in major metros.
Equipment. Desk, chair, monitor, headset, keyboard, mouse. Per agent: £800–£1,500 for initial setup. Replacement/refresh cycle: £200–£400/year per agent.
Utilities, cleaning, security. Allocated share for a 20-seat centre: £8,000–£15,000/year.
Subtotal — facilities per year: £72,000–£120,000. Per call: £0.36–£0.60.
The Full Stack: True Cost Per Call
Let’s assemble the complete picture for a 20-seat centre handling 200,000 calls per year:
| Cost Layer | Annual Cost | Per Call |
|---|---|---|
| Direct labour (20 agents) | £600,000–£700,000 | £3.00–£3.50 |
| Platform stack | £40,000–£80,000 | £0.20–£0.40 |
| Management overhead | £134,000–£200,000 | £0.67–£1.00 |
| Attrition cycle | £35,000–£70,000 | £0.18–£0.35 |
| Facilities | £72,000–£120,000 | £0.36–£0.60 |
| Total | £881,000–£1,170,000 | £4.41–£5.85 |
For a UK mid-market ISP running a 20-seat support operation, the true fully-loaded cost is £4.40–£5.85 per call. At the upper end — which includes London facilities, premium CCaaS licensing, and high attrition — costs easily reach £7–£10 per call.
In the US, where salaries are higher, facilities more expensive in tech hubs, and healthcare costs add a significant benefits layer, the fully-loaded number is typically $7–$12 per call.
And this calculation assumes the centre is operating at capacity. During off-peak periods — evenings, weekends, early mornings — you’re paying for agents who are underutilised. The cost per call during low-volume hours is substantially higher because the fixed costs (management, platform, facilities) don’t scale down.
What Happens When AI Handles 70% of the Volume
The economics shift dramatically when AI voice agents handle the structured, repeatable calls that constitute the majority of contact centre volume.
For an ISP, those calls include: service status enquiries, billing questions, payment processing, password resets, basic troubleshooting, and outage notifications. These represent 60–80% of inbound volume depending on the ISP.
AI cost per call: £0.65–£1.10, depending on call duration and complexity. No salary. No NI. No pension. No attrition. No desk. No CCaaS seat.
The hybrid model for a 200,000-call centre:
| Call Type | Volume | Handler | Cost Per Call | Total Cost |
|---|---|---|---|---|
| Tier 1 (AI-handled) | 140,000 (70%) | VersaTalk | £0.85 | £119,000 |
| Tier 2/3 (Human-handled) | 60,000 (30%) | 6–8 agents | £5.50 | £330,000 |
| Total | 200,000 | — | — | £449,000 |
Previous model total cost: £881,000–£1,170,000. Hybrid model total cost: ~£449,000. Annual saving: £432,000–£721,000.
The saving comes from three structural shifts. First, AI calls cost 85–90% less than human calls. Second, you need 60% fewer human seats, which reduces management, facilities, attrition, and platform costs proportionally. Third, the remaining human agents handle only complex calls that justify their training and salary — they’re working at the top of their skill level, which improves satisfaction and reduces turnover.
The remaining 6–8 agents are not answering “is my internet down?” on repeat. They’re handling genuine customer problems, retention conversations, and escalations that require empathy and judgement. Their job is harder, more varied, and more rewarding — which is why attrition drops when AI handles the repetitive volume.
The Number Your CFO Needs
If you remember one calculation from this article, it’s this:
(Current call volume × current cost per call) − (AI call volume × AI cost per call + human call volume × human cost per call) = annual saving.
For a 20-seat centre: £432,000–£721,000 per year.
For a 50-seat centre: the numbers scale linearly. You’re looking at £1M+ in annual savings.
The AI doesn’t pay for itself over a year. It pays for itself in the first quarter — and every subsequent quarter is pure margin improvement.