Companies have long been used to outsourcing certain functions in an effort to alleviate workloads, tap into expertise and boost efficiency. However, lately, co-sourcing models are emerging as an alternative. Put simply, co-sourcing is a hybrid partnership where companies’ in-house teams collaborate with external consultants, still allowing them to share the workload and compensate for skills shortages in the business, whilst maintaining a level of control and visibility.
The reason for this increase in co-sourcing’s use is down to the fact that full-service outsourcing suffers from numerous drawbacks. It can be expensive, particularly in the early years of engagement; clients can often get locked-in to lengthy contracts with limited options; consultants hold critical data restricting visibility and flexibility; and, in the long term, for mature organisations, outsourcing can become inefficient.
This all makes perfect sense, but why is this evolution only happening now? Outsourcing has long been ingrained in business strategy, and as with many evolutions, new approaches take time to be adopted and become mainstream. But the real key that has allowed co-sourcing to take off is the soaring use of cloud platforms over the past decade, making it possible for teams – both internally and externally – to work on the same platform for projects. This takes away any worries about version control thus enabling teams to work co-operatively and efficiently across multiple sites and geographies.
Cloud platforms also allow businesses to maintain visibility into their external contractors’ work. Where before they would have had to pass over full control, having to wait for a response on any project updates or process check-ins, they can now log onto the platform and see first-hand where progress has been made and where it may be stalling. Proving very valuable for project managers in maintaining control, it isn’t surprising that Deloitte believes 46% of companies will choose co-sourcing for projects that require specialist knowledge, such as regulatory compliance.
Candidates for co-sourcing —
It isn’t just regulatory compliance where co-sourcing proves its value. There are many use cases for businesses across all sectors. When performing critical internal audits, for example, co-sourcing gives businesses access to auditors with deep technical expertise during high-risk or peak periods, without having to fully outsource their audit programme. Thus, strengthening assurance while keeping oversight firmly in-house.
In cybersecurity, the model provides rapid access to threat-monitoring capabilities, incident response teams and niche skills such as penetration testing. Co-sourcing helps organisations stay ahead of evolving risks by scaling external support when needed while retaining ownership of core governance and policy.
For IT support, co-sourcing brings flexible capacity during system upgrades, cloud migrations or periods of heavy demand. It enables round-the-clock support coverage and faster deployment of new technologies, while ensuring day-to-day responsibilities remain with the internal team.
When it comes to finance and accounting, teams often use co-sourcing to manage year-end pressures, regulatory reporting and specialist areas such as tax, automation or analytics. This model delivers accuracy and resilience without long-term hiring costs.
Functions such as HR, legal & compliance, and data analytics also benefit. HR can co-source recruitment or learning programmes; compliance teams can access specialist regulatory knowledge; and analytics teams can bring in external data experts to accelerate insight generation.
The benefits —
What has become clear is that co-sourcing offers the best of both the worlds of in-house management and third-party contractors and can evolve and rebalance through the lifecycle of any project, making it more flexible and adaptable.
It offers specialised expertise on tap on a pay-as-you-go basis. Many functions, such as cybersecurity, internal audit or tax, now require deep, niche knowledge that is difficult and expensive to maintain entirely internally. Co-sourcing provides access to these skills on demand, without the commitment of permanent recruitment.
As compliance requirements expand across finance, data protection, and sector-specific rules, organisations often struggle to keep pace. Partnering with specialists ensures that teams remain aligned with current standards while retaining overall control of governance and decision-making. Co-sourcing is also the ideal model for coping with the variable workloads and seasonal spikes familiar to financial, IT and HR teams, enabling companies to scale up and down as needed.
Finally, co-sourcing also strengthens risk mitigation, particularly in areas like cybersecurity and compliance, where external partners bring specialist tools, experience and monitoring capabilities that boost organisational protection. At the same time, it supports business transformation projects by allowing external partners to speed delivery while internal teams maintain ownership of the outcomes.
As the underlying technologies – including cloud platforms, data security, automation and AI – that enable co-sourcing have matured, it has become the natural choice for many organisations and functions. 2026 is the year you must ask whether it is right for you.
Russell Gammon is chief innovation officer at Tax Systems.
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