In recent years, services procurement has become a focal point in external workforce conversations, accelerated by the proliferation of contingent workforce managed service providers offering services procurement add-ons to their traditional staffing programmes.
According to Staffing Industry Analysts (SIA), services procurement refers to “the advanced application of procurement methodologies and disciplines to the acquisition of enterprise services… most often used in reference to the provision of more complicated services categories executed under discrete contracts such as SoWs (statement of works), consulting, and outsourced services."
Clear as mud? Given the broad scope of SIA’s definition, it is no surprise that procurement teams question why they would outsource service buying to a managed service provider whose expertise has historically centred on contingent labour supply. This hesitation is amplified when organisations already possess strong internal category management capabilities. Strong category management is the bedrock of any successful procurement function. It involves organising spend into specific areas or categories to optimise purchasing decisions and reduce procurement costs. For large organisations, internal teams often handle this exceptionally well. They build preferred supplier lists based on historical demand and strategic importance.
However, category management alone cannot solve every procurement challenge. When spend becomes fragmented or unpredictable, traditional category management strategies often fall short. This is where services procurement and managed services enter the equation to provide additional control, visibility, and compliance.
Fully contracted out services (FCOS)
When looking beyond category management, it helps to understand fully contracted out services. FCOS refers to cases where an organisation outsources entire business functions to external providers who assume full responsibility for service delivery, outcomes, and performance.
Typical high-value examples include IT support, call centres, security operations, HR admin, payroll, facilities management, and finance operations. These services are generally predictable and strategically significant, so procurement ownership and contract management remain internal.
In this case, managed service providers may still play a role, commonly assist in non-procurement administrative tasks such as supplier vetting and onboarding, especially where FCOS suppliers deploy personnel onsite. Providers frequently report such activity as services procurement spend under management, although this involves little to no actual sourcing activity.
Non predictable, ad-hoc demand
Some FCOS professional services categories involve budgets with unpredictable utilisation - marketing, legal services, and niche consulting are classic examples. Organisations typically establish preferred supplier lists based on historical demand, with procurement engaging above certain thresholds and line managers handling low-value, tactical engagements.
When spend is highly fragmented or at risk of maverick buying, services procurement management can provide significant value. SPM models are particularly powerful when:
Tail spend is high and scattered
Line managers bypass sourcing rules
Suppliers are repeatedly engaged using multiple POs to game thresholds
New supplier onboarding needs to be controlled yet accelerated
Tail spend is widely acknowledged as a major source of inefficiency and unmanaged risk, representing up to 20% of total spend and involving 80% of suppliers. Specialist SPM models mitigate this via structured supplier marketplaces, competitive bidding, best-practice scoping, risk control, and project oversight.
Notably, SPM solutions differ from traditional managed service programmes (MSPs). Where MSPs focus on contingent labour, SPM specifically manage non-predictable full contracted out professional services and embedded service requirements. They are designed to drive engagement, compliance, competition, and outcome-based buying - critical factors in professional services procurement.
The risks of embedded services
Embedded services refer to project-based or resource-based engagements integrated directly within internal teams. This typically occurs through statements of work (SoW). Examples include individual consultants, project specialists, or full project teams. These are often engaged directly by line managers, with procurement notified only after commercial terms are agreed, if they are notified at all. While this approach is flexible, it creates significant risks for the organisation.
Navigating IR35 and off-payroll risk
A persistent misconception is that engaging resources via a SoW automatically places the work outside IR35.
HMRC guidance is explicit on this matter. If services are provided through an intermediary, even when routed via a consultancy, organisations must carry out a status determination statement (SDS). They must ensure the actual working practices reflect outside IR35 requirements rather than just relying on the label on the contract. The SDS should act as the start line for an outside IR35 determination, not the finish line.
Key red flags include:
Vague SoWs limited to high-level deliverables
Resource-based SoWs engaged on extendable sprints
Lack of time-bound milestones aligned to deliverables and overall service outcomes
Supplier-provided individuals operating under client control or supervision
Allocated tasks crossing into deemed employee territory, such as managing teams of internal employees
Given the widespread misclassification risk and expanded employer responsibilities under the IR35 reforms, organisations without robust governance face significant tax, financial, and compliance exposure.
Mitigating operational and commercial risks
Poorly defined scopes, unclear acceptance criteria, ambiguous payment terms, and lack of change control open the door to cost overruns, disputes, and delivery failure.
By adopting SPM, organisations can control IR35, operational, and commercial risks. They achieve this by building out and managing requirements against a strict set of criteria:
Project overview
Project objective and goals
Deliverables
Milestones, including timelines and RAG status
Roles and responsibilities
Assumptions and dependencies
Acceptance criteria
Budget
Variation orders
A good SPM provider will offer artificial intelligence tools, specialist technology, and expert people to manage these risks for their customers. SPM teams also work proactively with line managers and suppliers to ensure best practice, positive outcomes, and value for money.
The benefits of adopting an SPM model
Adopting an SPM model enables organisations to bring structure, compliance, visibility, and commercial discipline to both unpredictable professional services and embedded service spending.
Key benefits include:
Specialist technology providing a single online point of contact for end users and suppliers to engage.
Proactive market testing to inform end users of realistic budgets and capability, and to inform suppliers of tangible pipeline opportunities.
Curated open supplier marketplaces that expand end user choice while creating healthy competition.
Dedicated requirement scoping support that combines practitioner expertise and AI tools to define deliverables, milestones, assumptions, dependencies, roles, responsibilities, and acceptance criteria.
Proposal development helping the end user and supplier to develop and align on outcomes during the bid phase.
Negotiation tools to reach sustainable and competitive pricing.
Post go-live delivery governance enabling active collaboration between end user and supplier to ensure outcomes meet expectations across the project lifecycle.
Escalation management to control exceptions and ensure projects stay on track.
Variation control preventing scope creep and cost escalation.
Legislative compliance, including robust IR35 assurance.
Optimise your services procurement strategy
Success in services procurement requires organisational alignment. Line managers and suppliers must understand, value, and commit to the SPM processes. If they do not, they will simply continue to work around them.
Leveraging SPM technology, expertise, established processes, and market insights is essential to shaping non-predictable demand. This approach improves supply quality and protects your organisation from legislative, financial, and operational risk.
Are you ready to gain full visibility over your tail spend, ensure IR35 compliance, and drive cost efficiency across your business? Get in touch with our specialists today, to discover how a tailored SPM model can transform your workforce strategy.
