Managed IT · Co-managed
How co-managed IT works, which tasks to split, and the one-page responsibility chart that prevents dropped balls.
Who usually does what
Sharing admin access safely
A responsibility chart to copy
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Co-managed IT means your in-house IT person or small team keeps their role, and an outside provider covers the work they cannot: overflow help desk, after-hours coverage, security tools and monitoring, backups, specialist projects and vacation cover. It works when every recurring task has one named owner in writing, both sides use the same ticketing and documentation, and admin access is shared through separate, auditable accounts. It fails when “we both handle security” means nobody does. The rest of this article shows how to split the work and set it up.
A business with 40 to 100 people often has one IT person who knows the company well. That knowledge is valuable and hard to replace. The problem is coverage. One person cannot be an expert in networking, Microsoft 365, security, backups and the accounting system at the same time, take vacation without a gap, and keep up with projects while answering every ticket.
Hiring a second person is expensive. The Bureau of Labor Statistics puts the May 2025 median pay for network and computer systems administrators at $99,130, before benefits, tools and training. Co-managed IT adds depth and tooling without a second full salary, and it gives your IT person someone to escalate to.
Typical triggers:
There is no single right split. These three patterns cover most small and midsize businesses.
Your IT person handles users, on-site requests and business apps. The provider runs patching, endpoint protection, backups, monitoring and the network.
The provider takes first-line tickets. Your IT person focuses on projects, vendors and strategy, and handles escalations that need local knowledge.
Your IT person does most of the work. The provider covers security tooling, after-hours, vacations and specific projects such as a migration.
CISA’s joint advisory on managed service providers tells customers to clearly identify ownership of security roles and responsibilities, including who handles hardening, detection and incident response. In a co-managed setup that matters twice as much, because there are two parties who might each assume the other is doing it.
Build a one-page chart. List each recurring task, then mark one owner, who helps, and who must be told. A starting list:
Every line gets exactly one owner. Review the chart every quarter and whenever someone changes roles.
Co-managed IT means more people with administrator rights. Handle that deliberately.
If you want an outside read on where the gaps are before you split the work, our free Technology Health Assessment rates IT operations, cybersecurity and business continuity in a plain-language report the next day, with next steps in order.
Most of these trace back to an unclear owner. Fix the chart first, then the process. If the same task keeps slipping, move it entirely to one side rather than sharing it, and write down why so the decision survives staff changes on either side.
JLB USA provides managed IT for businesses with roughly 25 to 100 employees and can work alongside an existing IT person, splitting the work the way your team needs. Security tooling and monitored backups are part of our cybersecurity services.
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An arrangement where your in-house IT staff keep their role and an outside provider covers agreed parts of the work, such as help desk overflow, security tools, backups, after-hours support or projects.
It depends on the split. You keep paying your IT person, so total cost can be similar. The value is depth and coverage that one person cannot provide, without hiring a second employee.
It should not. A good co-managed setup makes your IT person more effective by taking routine or specialist work off their plate. Say so in writing if job security is a concern.
Give every person their own admin account with multi-factor authentication and only the roles they need, keep audit logs, and know which accounts to disable if the arrangement ends.
Whoever the written responsibility chart names. Decide first response, escalation and outside help in advance, and test the plan once a year.
