"Should we outsource all of IT or just part of it?" comes up in nearly every growing organization, and MSPs hear it from prospects every week. The answer usually comes down to how much control the organization wants to keep and where its gaps are.
Fully managed IT
In a fully managed model, the provider takes end-to-end responsibility: help desk, monitoring, patching, security, projects and strategy. The client has no internal IT staff, or only a light internal point of contact.
- Best for: small and mid-sized businesses without an IT department.
- Strength: one accountable provider and predictable monthly cost.
- Trade-off: less day-to-day control in-house.
Co-managed IT
In a co-managed model, an internal team keeps ownership and an outside partner fills specific gaps such as after-hours coverage, escalations, security or projects.
- Best for: organizations with internal IT, and MSPs that need extra senior capacity.
- Strength: keeps institutional knowledge and control while adding depth.
- Trade-off: needs clear roles and shared tooling to work well.
Side-by-side
| Fully managed | Co-managed | |
|---|---|---|
| Who owns day-to-day IT | Provider | Internal team |
| Control | Lower | High |
| Cost model | Per user or per device | Retainer or hour blocks |
| Ideal team size | No internal IT | 1 to 20+ internal IT staff |
| Coverage gaps closed | All | The ones you choose |
How to decide
If there is no internal IT team, fully managed is usually the right call. If there is a capable team that is stretched, missing a skill, or can't cover nights and weekends, co-managed adds what's missing without replacing anyone.
For MSPs, co-managed works in both directions: you can sell it to clients with internal IT, and you can use a partner like ByteWyse in a co-managed way to add senior engineers to your own bench.