Public Interest Test 2027: A Practical Readiness Guide for Public Sector Procurement Teams

Purpose: How in-scope central government organisations can prepare now for the Public Interest Test that starts on 1 April 2027, while wider public sector bodies can use the same disciplines voluntarily.

How in-scope central government organisations can prepare now for the Public Interest Test that starts on 1 April 2027, while wider public sector bodies can use the same disciplines voluntarily. This matters because public procurement decisions are rarely isolated events. A choice made during planning can affect competition, affordability, service quality, supplier behaviour and the ability to manage the contract later. The strongest approach is therefore to use the source guidance as part of an end-to-end commercial process, with clear ownership and evidence rather than as a document that is completed after the key decisions have already been taken.

Quick summary

• The PPN applies to central government departments, executive agencies and non-departmental public bodies; other public sector contracting authorities are encouraged to consider the approach.
• From 1 April 2027, an in-scope organisation should conduct a Public Interest Test before a new planned project or re-procurement for a service valued above £1 million including VAT, subject to the stated exemptions.
• The test is intended to ensure the viability of internal delivery is considered before procurement starts, rather than after a preferred sourcing route has been fixed.
• The accompanying guidance describes the test as an early-stage assessment and says it is normally undertaken around Strategic Outline Case stage or equivalent.
• The policy seeks a broader view of value for money, including service quality, resilience and wider economic and social considerations, rather than a simple short-term price comparison.

What the guidance means in practice

The source material gives several anchors for that process. The PPN applies to central government departments, executive agencies and non-departmental public bodies; other public sector contracting authorities are encouraged to consider the approach. From 1 April 2027, an in-scope organisation should conduct a Public Interest Test before a new planned project or re-procurement for a service valued above £1 million including VAT, subject to the stated exemptions. The test is intended to ensure the viability of internal delivery is considered before procurement starts, rather than after a preferred sourcing route has been fixed. These are not interchangeable statements: some describe statutory or policy requirements and others describe recommended commercial practice. Teams should identify which category each requirement falls into, apply it to the organisation and procurement in scope, and keep a record of the judgement. Where guidance from 2021 or 2023 predates the Procurement Act 2023, its commercial principles can remain useful, but current legislation, regulations and current statutory guidance take precedence on legal process.

The practical value becomes clearer when the remaining guidance is read alongside the project lifecycle. The accompanying guidance describes the test as an early-stage assessment and says it is normally undertaken around Strategic Outline Case stage or equivalent. The policy seeks a broader view of value for money, including service quality, resilience and wider economic and social considerations, rather than a simple short-term price comparison. Any later insourcing or outsourcing decision must still be carried out in accordance with the Procurement Act 2023. In day-to-day terms, this means the buyer should be able to answer three questions at any approval point: what outcome are we trying to achieve, what evidence supports the proposed commercial approach, and what will need to be managed after the decision is made? If those answers are weak, more analysis is normally more useful than adding another layer of narrative to an approval paper.

A practical process to follow

A proportionate process can be built into existing governance. The steps below are deliberately practical. They are not a substitute for the detailed source guidance, legal advice or local standing orders, but they provide a useful structure for a procurement or commercial team.

1. Step 1. Screen the forward procurement pipeline for service projects likely to fall within scope. Record any assumption that could change the conclusion and when it will be reviewed.
2. Step 2. Identify the service outcome and current delivery model before discussing a route to market. Keep the analysis proportionate to the value, risk, novelty and criticality of the requirement.
3. Step 3. Bring commercial, finance, operations, HR, policy and other relevant specialists into the assessment early. Capture the source evidence and name the person accountable for the next decision.
4. Step 4. Record the evidence for internal delivery viability, market delivery, capability, transition and resilience. Record any assumption that could change the conclusion and when it will be reviewed.
5. Step 5. Connect the result to existing business case, Delivery Model Assessment and procurement governance. Keep the analysis proportionate to the value, risk, novelty and criticality of the requirement.
6. Step 6. Retain the decision trail so later approvers and contract managers can understand what was considered. Capture the source evidence and name the person accountable for the next decision.

What good looks like

Good practice is visible in the decision trail, not only in the final document. A reviewer should be able to follow the line from the service need, through market and cost evidence, to the route, evaluation, contract terms and management arrangements. Where several functions contribute, the file should show who owns each decision and where challenge occurred. The same principle applies to handover: useful assumptions, models, KPI definitions, risks, supplier information and approval conditions should move into mobilisation and contract management instead of being left in the sourcing archive. This continuity is particularly important for long-running public services, where staff can change but the organisation remains accountable for the outcome.

Recommendations for procurement teams

The following recommendations are suitable for teams that want to embed the topic into normal ways of working rather than create a parallel compliance process:

• Create a mandatory Public Interest Test question in procurement initiation documents.
• Start with the 2027 pipeline rather than waiting for individual procurements to reach tender stage.
• Reuse evidence from Delivery Model Assessments and Should Cost Models where it is genuinely relevant.
• Set clear ownership for the test and for any capability-building actions.
• Train senior responsible owners and budget holders as well as commercial staff.
• Check the current PPN and accompanying guidance before applying the process to a live requirement.

Common pitfalls to avoid

The most common problems are usually process failures rather than a lack of templates. Watch particularly for the following:

• Starting after the route to market is effectively decided.
• Treating the test as a price-only make-or-buy calculation.
• Assuming an exemption applies without recording why.
• Running the test separately from normal project governance.

Easy-to-read takeaway

For public interest test 2027: a practical readiness guide for public sector procurement teams, the core discipline is to start early, connect the analysis to a real decision and preserve enough evidence for the next stage of the lifecycle. The source material should help teams make better decisions, not merely produce more paperwork. Before acting on a live procurement, confirm the current version of the Procurement Act 2023, regulations, Procurement Policy Notes and any organisation-specific approvals or delegations. This is especially important for thresholds, notice duties, exemptions and policy requirements that can change over time.

Source basis

Primary source used: PPN 024: The Public Interest Test and Insourcing Strategy, June 2026. Related articles in this collection also draw on the other supplied Cabinet Office, HM Treasury and Procurement Act materials where the topics overlap.

This article is general procurement support content. It should be read alongside current legislation, statutory guidance and your organisation’s own governance and legal advice.