In-House IT vs Outsourced IT: Full Cost & Capability Comparison

Should you hire your own IT staff or outsource to a managed service provider? It's one of the most consequential technology decisions a growing business makes — and the answer isn't as straightforward as either camp would have you believe.

Both models have genuine strengths and real limitations. This guide compares them honestly across cost, capability, scalability, and risk — so you can make the right decision for your specific situation.

The True Cost of In-House IT

When businesses think about hiring an IT person, they typically think about salary. But salary is only part of the picture. Here's the full cost for a single in-house IT support engineer in the UK:

• Salary: £30,000–£45,000 for a competent generalist (higher in London and the South East)
• Employer's NI: ~£4,500–£6,000 per year
• Pension contributions: ~£1,500–£2,250 per year (at 5%)
• Training and certifications: £2,000–£5,000 per year to keep skills current
• Tools and software: £3,000–£8,000 per year for RMM, ticketing, security, and backup tools
• Recruitment costs: £5,000–£10,000 per hire (amortised over tenure)
• Holiday and sick cover: 28+ days per year where you have no IT support (or pay for temporary cover)

Total: roughly £45,000–£70,000 per year for a single IT staff member — and that assumes they never leave, never get sick for extended periods, and can handle everything from desktop support to networking to security to cloud administration.

The True Cost of Outsourced IT

Outsourced managed IT support is priced per user per month. For comparison with the in-house figures above:

• 20 users: £1,100–£1,700/month → £13,200–£20,400/year
• 50 users: £2,750–£4,250/month → £33,000–£51,000/year
• 100 users: £5,000–£7,500/month → £60,000–£90,000/year

At 20 users, outsourcing costs roughly a third of a single in-house hire. At 50 users, the costs become comparable — but the outsourced team provides access to a full bench of specialists, not a single generalist. For a detailed cost comparison, read our guide on in-house IT vs outsourced IT costs in the UK.

Capability Comparison

Breadth of Expertise

A single IT hire — no matter how talented — cannot be an expert in networking, security, cloud platforms, desktop support, server administration, and business strategy simultaneously. They'll be strong in some areas and have gaps in others.

An MSP provides a team that collectively covers all disciplines. When you raise a networking ticket, a networking specialist works on it. When you have a security question, a security engineer responds. This breadth of expertise is the single biggest advantage of outsourcing.

Availability

Your in-house IT person works roughly 230 days per year (after holidays, bank holidays, and average sick days). During the other 135 days, you have no IT support unless you pay for temporary cover or a second hire.

An MSP provides continuous coverage during contracted hours — usually with multiple technicians available simultaneously. No single point of failure.

Response Speed

Here's where in-house IT has an advantage: if your IT person is in the office and available, they can respond to issues within minutes — walking over to someone's desk to fix a problem. An MSP may take 15-30 minutes to respond remotely.

However, if your in-house person is busy with a major issue, everyone else waits. An MSP can handle multiple tickets simultaneously because they have a team.

Business Knowledge

An in-house IT staff member understands your business intimately — the people, the processes, the politics, the applications. They know that the finance team's month-end process is sacred, that the MD's laptop needs special attention, and that the warehouse printer is critical.

An MSP can build this knowledge over time, but it takes months to develop the same depth of understanding. Good MSPs mitigate this with thorough documentation and consistent account management.

Scalability

As your business grows, how does each model scale?

• In-house: You need to hire additional staff in steps — going from one IT person to two doubles your cost overnight. And finding good IT staff is increasingly difficult in the UK's tight labour market
• Outsourced: Adding users to an MSP contract is incremental. Go from 30 to 50 users and your cost increases proportionally, with no recruitment, no onboarding, and no additional management overhead

Risk Factors

Key Person Risk

If your single IT hire resigns with four weeks' notice, you have a month to recruit their replacement while simultaneously getting them to document everything they know. This is the number one risk of the in-house model, and it's the risk most businesses underestimate.

With an MSP, no single individual holds all the knowledge. Documentation is centralised, processes are standardised, and the team continues to operate regardless of individual staff changes.

Security Risk

Cyber security requires dedicated, constantly updated expertise. An in-house generalist managing security alongside everything else will inevitably have gaps. An outsourced IT support provider typically employs dedicated security specialists and invests in enterprise-grade security tools that would be cost-prohibitive for a small business to acquire independently.

When In-House IT Makes More Sense

• You have 100+ users and can afford a team (not just one person)
• Your industry requires on-site presence for regulatory or operational reasons
• You run highly specialised systems that require deep institutional knowledge
• You need instant physical access to equipment (manufacturing floors, labs)

When Outsourcing Makes More Sense

• You have fewer than 80 users and can't justify a full IT team
• You want access to a broad range of expertise without multiple hires
• You need guaranteed availability (no single-point-of-failure risk)
• Cyber security is a priority and you don't have a dedicated security person
• You want predictable monthly IT costs instead of variable salary and recruitment expenses

The Third Option: Co-Managed IT

Increasingly, UK businesses are choosing a hybrid approach: keeping an internal IT person for day-to-day tasks and business-specific needs while outsourcing specialist functions (security, infrastructure, and out-of-hours support) to an MSP. This co-managed model gives you the best of both worlds — internal knowledge combined with external depth and scalability.