Internal audit
Should we co-source or outsource our internal audit?
Co-sourcing means an external partner works alongside your in-house internal audit team, adding capacity and skills while you keep ownership. Outsourcing means the partner runs the whole function for you and reports to your board. The decision rule is simple: if you have a capable audit team that needs more hands or specialist skills, co-source. If you have no team, or your board wants a fully independent function, outsource. Either way you should expect a risk-based plan, board-ready reporting, and findings tracked to closure. This guide explains both models and when each is the right call.
Murikah
Independent assurance and AI governance
The two models get muddled often, and choosing wrong wastes money or leaves a gap. The distinction is actually clean, and so is the decision.
What each model means
Co-sourcing keeps your internal audit function in-house and brings a partner in alongside it. You own the function; the partner fills the gaps. Outsourcing hands the whole function to a partner who runs it and reports to your board. The difference is simply who owns and runs the function day to day.
When co-sourcing is the right call
Co-source when you already have a capable audit team but it is stretched, or when a specific audit needs skills you do not have in-house, such as IT general controls, data protection or AI governance. You keep control and continuity, and you pay only for the capacity and expertise you add. It is also the natural fit for organisations that want to build their own function over time with expert support.
When full outsourcing makes sense
Outsource when you have no internal audit function yet, when building one is not justified by your size, or when your board specifically wants an independent function it does not have to manage. This is common for smaller SACCOs and NGOs that still need credible, board-level assurance but cannot carry a full department.
What good looks like either way
The model should not change the quality. In both cases you should expect a risk-based annual plan the board approves, fieldwork that is properly evidenced, findings that are rated and tracked to closure, and reporting your audit committee can act on. If the output differs depending on the model, something is wrong with the delivery, not the model.
How Murikah delivers both
We deliver co-sourced and outsourced internal audit on the same method and the same platform, so you can start with either and move between them as you grow. The work runs on Assurance OS, so the evidence and the board reporting stay consistent whichever model you choose, and the records stay with you.
Frequently asked questions
What is co-sourced internal audit?
Co-sourcing is when an external partner works alongside your existing internal audit team. You keep the function, the ownership and the institutional knowledge, and the partner adds capacity for busy periods or specialist skills such as IT, data protection or AI governance. It is the common choice for organisations that have a team but cannot cover everything alone.
What is outsourced internal audit?
Outsourcing is when the partner runs the internal audit function for you, end to end, and reports to your board or audit committee. It suits organisations that do not have an in-house team, or whose board wants a fully independent function without building one. You still own the relationship and the evidence; the partner provides the people and the method.
Which is cheaper?
It depends on what you already have. If you have an audit team, co-sourcing adds only what you are missing, which is usually the lower total cost. If you have no team, outsourcing is almost always cheaper than hiring, equipping and training one. The honest answer is to scope it: the right model is the one that delivers the plan your board needs at the lowest sensible cost.
Can we switch between the two?
Yes, and many organisations do. A common path is to start outsourced, build confidence and capability, then move to co-sourcing as you bring people in-house. Because the method, the reporting and the platform stay the same, switching is a change of mix rather than a fresh start.
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Put this into practice
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