R&D Advance Assurance: clarity or complexity?

HMRC’s new targeted Advance Assurance pilot for R&D tax relief is positioned as a way to provide earlier certainty for SMEs.

However, while the concept is sensible, there are a number of practical considerations that mean businesses should approach the pilot with care.

Clarity, but not certainty

A key limitation is that there is no guarantee that an enquiry will not follow, even after assurance has been obtained. This raises a fundamental question of how much benefit the process really provides.

The application process also requires a wider level of disclosure than the four targeted areas might suggest. For example, in presenting the fact pattern for a potential case of Contracted Out R&D, the form cannot be submitted until information on project qualification and projected spend is included. This creates two challenges:

• Uncertainty over how that information will be used
• Potential exposure to further queries rather than reduced risk

Limited value for more complex claims

The pilot is most constrained in situations where complexity is highest – often where support is most needed. This is particularly relevant for:

• Businesses with multiple R&D projects
• More complex contractual arrangements
• Companies with overseas or connected entities

In these scenarios, the assurance process may only address part of the overall risk.

No formal challenge or appeals route

Another key restriction is the lack of a review or appeals process.

HMRC provides a simple yes/no outcome with explanation, but there is no structured route to challenge conclusions and guidance is unclear on what follows if a business disagrees.

In practice, this may mean proceeding with a full claim submission regardless, with a detailed filing position and technical justification as to why the claimant has a different view to HMRC.

Operational and timing challenges

The 40-day response window, combined with the need for follow-up responses, introduces practical challenges:

• Businesses must engage earlier in the post-year-end timeline
• There is pressure to align assurance with tax return deadlines
• There is no clear integration with the existing submission processes, for example, there is no planned updates to the tax return or Additional Information Form (AIF) to highlight whether assurance was sought and the outcome

Will the pilot gain traction?

The programme runs alongside the existing Advance Assurance service, which has historically seen limited take-up.

This creates uncertainty about whether participation levels will be sufficient and how meaningful the pilot results will be in shaping future policy.

Focus on getting the claim right first

While the pilot may be helpful in specific cases, it is not a substitute for strong technical preparation.

HMRC’s expectation is that evidence is tracked and collated, and project qualification monitored throughout the lifecycle of the claim – rather than being addressed retrospectively at the point of claim compilation.

The priority should remain:

• Robust technical analysis from the outset, with ongoing monitoring of qualifying activity
• Clear articulation of eligibility and methodology
• Comprehensive, contemporaneous supporting documentation

Targeted Advance Assurance should be seen as a selective tool rather than a solution.

Key considerations

HMRC’s pilot signals continued scrutiny of R&D tax relief and a desire for earlier engagement with claim methodologies.

However, businesses should proceed with caution:

• It does not remove enquiry risk
• It is limited in scope for more complex claims (i.e., ones where a claimant wants to consider multiple aspects across multiple projects)

The most effective approach remains unchanged – build certainty before submission, not after.

We’re here to help

R&D tax relief continues to evolve, with increased scrutiny and complexity across claims. Whether you’re considering the new assurance pilot or preparing a submission, getting the right support early is critical.

Speak to our specialist R&D tax team to understand how the pilot may apply to your business and ensure your claim is robust, well‑evidenced and defensible.