Something has shifted in how UK procurement teams are thinking about technology and transformation spend.
Conversations that used to start with “we need a contractor framework” are increasingly starting with “we need outcome-based delivery.” Where buyers once asked suppliers for day rates and CVs, more are now asking for scoped deliverables, milestone-based payment schedules, and clear accountability for results.
Statement of Work is nothing new, but the energy behind it is. And, increasingly, the push is coming from procurement, not delivery.
What’s driving the shift
IR35 risk has become a procurement problem, not just a tax one.
From April 2026, Joint and Several Liability rules apply to umbrella company arrangements, meaning HMRC can recover unpaid tax from other parties in the labour supply chain – including agencies and, in some cases, end clients.
That has put a new line item on procurement’s risk register. Contractor populations that used to sit comfortably under existing frameworks now require active oversight. SoW, structured properly, removes the question entirely: the supplier owns the delivery, the workers, and the tax position.
Cost discipline has tightened.
Day-rate inflation in specialist areas hasn’t reversed, and procurement teams are under sustained pressure to demonstrate that what’s being spent is producing what was promised.
Time-and-materials engagements don’t lend themselves to that conversation. Fixed-price, outcome-linked SoW does.
Accountability is being pushed up the chain.
Programmes that overrun, under-deliver, or quietly absorb additional contractor headcount to hit dates are increasingly visible to finance and the board. Procurement is being asked to structure engagements that make delivery risk legible – and SoW, with its scoped deliverables and milestone gates, is the cleanest commercial vehicle for doing that.
For end-clients managing large contractor populations, the April 2026 JSL framework has prompted a wave of risk reviews, with increased adoption of SoW and project-based models among the most likely responses.
The supplier-side problem nobody talks about
Here’s the issue procurement teams are running into: demand for SoW has grown faster than the supply of suppliers who can genuinely deliver it.
Plenty of recruiters and staffing firms have repositioned around SoW language. The contracts say “outcome-based.” The commercial terms reference deliverables. But the underlying engagement model is unchanged – bodies, billed by the day, managed by the client.
HMRC has been explicit that if a contract is simply a supply of labour masquerading as a SoW, they will look past the contractual set-up, leaving the end hirer with the IR35 obligation they thought they had transferred.
A SoW that doesn’t reflect the reality of how work is being delivered doesn’t give you the IR35 protection, doesn’t give you the cost certainty, and doesn’t give you the accountability you signed up for. It gives you the worst of both worlds: contingent labour wrapped in commercial complexity.
The implication for procurement is unavoidable. The supplier evaluation now matters more than the contract terms.
What to look for in a genuine SoW supplier
The questions to ask sit beyond price and references:
Can they scope independently?
A supplier who needs you to write the SoW for them is, by definition, not equipped to own the outcome. Credible partners bring a scoping methodology, challenge your assumptions, and produce a definition of done that survives contact with delivery.
Who controls the how?
This is the substance test. In a genuine SoW, the supplier decides how to deliver: which people, which methods, which sequence. If you’re approving CVs and conducting interviews, you’re buying labour, not outcomes.
How is delivery risk allocated?
Real outcome-based engagements put a meaningful portion of the commercial risk with the supplier. If everything’s billed milestone-by-milestone with no claw-back, no risk-share, and no consequence for slippage, the risk allocation isn’t what the contract suggests.
What does mid-engagement governance look like?
Suppliers with delivery maturity build in structured checkpoints, escalation paths, and quality assurance that doesn’t require you to manage their team. If you’re running stand-ups for them, you’re not getting what you paid for.
Can they evidence comparable delivery?
Track record matters more in SoW than in staffing. You’re not buying access to a talent pool; you’re buying confidence that this organisation can deliver this kind of work, at this scale, in your context.
What this means for your supplier base
First, your existing roster may need rationalising.
Many procurement teams are sitting on PSL agreements with suppliers signed up for SoW capability that, on closer inspection, is contingent staffing in different packaging. That’s a procurement risk, an IR35 risk, and a delivery risk. Worth a fresh look.
Second, the supplier evaluation criteria need updating.
SoW selection isn’t the same as staffing selection. The depth questions (scoping discipline, delivery model, governance approach, risk appetite) matter more than rate cards and time-to-shortlist. Procurement teams that haven’t yet adapted their evaluation frameworks are, in effect, selecting SoW partners on staffing criteria.
The organisations getting the most value from this shift are the ones treating it as a category change, not a contract change. Outcome-based delivery requires outcome-capable suppliers, and that’s a smaller universe than the SoW marketing collateral suggests.
How Inscope Select fits
Inscope Select is the project and consultancy arm of Select Group, built specifically around SoW and outcome-based delivery for enterprise technology and transformation programmes.
We work with procurement teams, CIOs, and programme directors to structure engagements that genuinely transfer delivery accountability – and we’re equally happy to help you evaluate where existing supplier relationships do and don’t stand up to that test.
If you’re reviewing your SoW supplier base ahead of the next budget cycle, or scoping a programme where outcome-based delivery is the right answer, get in touch.
Book a conversation with Inscope →
Related reading: For the hiring-side view of the same shift, see our colleagues at Intec Select on contract or perm: the IR35 reality check for tech hiring in 2026.
