Spring 2026 R&D Advance Assurance Pilot: Step-by-Step Application Guide

Advance assurance for R&D tax relief is a service where HMRC reviews a specific aspect of your planned claim and tells you in writing whether it agrees with your position. The targeted advance assurance pilot, launched on 18 May 2026, sits within the merged R&D scheme introduced for accounting periods beginning on or after 1 April 2024. The pilot runs for 12 months. Any SME can apply, not just first-time claimants. The response target is 40 calendar days. If HMRC grants assurance, it covers the first three R&D claims you file after receiving the confirmation letter.

What Is Different About the 2026 Pilot

The original advance assurance scheme, introduced in 2015, was open only to companies making their first R&D tax claim. It covered the entire claim. Under the 2026 pilot, the rules are different on both counts.

First, any SME can apply, including companies that have been claiming R&D relief for years. If you have a specific aspect of a project that HMRC might challenge, you can seek clearance before filing.

Second, the pilot does not cover the whole claim. Each application covers one project and one specific topic area, chosen from four permitted areas. You can submit a maximum of two applications under the pilot. Think of it as targeted rather than blanket clearance.

The pilot was announced at the Spring 2026 Budget and launched on the same day as the mandatory agent registration requirement, 18 May 2026. HMRC has stated it will use feedback from applicants to inform future policy on advance clearances for R&D. A consultation on R&D advance clearances published earlier by HMRC set out the policy background.

Who Is Eligible

To apply under the pilot, a company must:

• Be an SME as defined for R&D tax relief purposes (fewer than 500 staff and either turnover under 100 million euros or balance sheet under 86 million euros)
• Be carrying out R&D, or be planning to carry it out, in the accounting period covered by the application
• Not yet have filed the R&D tax relief claim for that period

The following companies are ineligible:

• Companies that have entered into a disclosable Tax Avoidance Scheme (DOTAS)
• Companies categorised as Corporate Serious Defaulters by HMRC
• Companies with an open Corporation Tax enquiry for the relevant period

There is no restriction based on whether you have made previous R&D claims. A company on its tenth year of claiming can apply. So can a company planning its first claim who wants assurance on one specific area but does not want to go through the full-claim advance assurance process.

The Four Topic Areas

Each application under the pilot must focus on one of four topics. You choose one topic per application at the point of applying, and HMRC will not give an opinion outside the chosen area.

1. Whether the project meets the R&D tax definition

This is the most commonly requested topic. HMRC applies the guidelines published by the Department for Science, Innovation and Technology (DSIT) to decide whether a project qualifies. The main tests are whether there is a scientific or technological advance being sought, and whether there was a scientific or technological uncertainty at the outset. If your project sits in a grey area, for example because the advance is incremental or the uncertainty was resolved early, advance assurance on this topic can remove that uncertainty before you commit to a claim.

2. Whether overseas expenditure qualifies for relief

Under the merged scheme, subcontractor work and externally provided worker costs must generally be performed in the UK. There is a narrow exception where overseas performance is necessary for geographical, environmental, regulatory, or social reasons not related to cost. If you have overseas R&D costs you believe fall within the exception, this topic area lets you get HMRC's view before claiming. See the subcontractor eligibility rules for background on the UK provision requirement.

3. Which party can claim relief for contracted-out R&D

Where a company contracts out R&D work, the rules on who can claim relief changed under the merged scheme. Under the old SME scheme, the contractor could claim in many circumstances. Under the merged scheme, it is generally the company that bears the cost that claims. Where contracts are structured in ways that make the position unclear, advance assurance on this topic can confirm which entity should include the expenditure in its claim.

4. Whether the company qualifies for the PAYE and NIC contributions cap exemption

The PAYE cap limits the R&D tax credit a company can receive to three times its total PAYE and National Insurance contributions liability. Certain companies qualify for an exemption, primarily those with qualifying overseas employees and those meeting specific conditions. Assurance on this topic confirms whether the cap applies and whether the exemption is available.

What to Prepare Before You Apply

The online application form does not allow you to save progress or attach documents. You must have every piece of information ready before you begin. HMRC requires:

• Company Registration Number and Unique Taxpayer Reference (UTR)
• Accounting period start date
• Project start and end dates
• Contact details of a competent professional who knows the technical detail of the project (this is typically an internal researcher, engineer, or scientist, not the R&D tax adviser)
• A clear overview of the project: what problem it was trying to solve, what scientific or technological advance was sought, and what uncertainties existed
• Forecasted qualifying expenditure for the period
• The types of records already held (for example, project logs, lab notebooks, sprint records, meeting notes)
• For overseas expenditure applications: a clear explanation of why the work could not be done in the UK

The most common reason HMRC takes longer than 40 days is an incomplete initial submission. A project description that lacks specific technical detail, or that cannot clearly identify the scientific or technological uncertainty, will prompt a follow-up. Prepare the technical narrative as carefully as you would prepare the project narrative for the Additional Information Form.

The Application Process, Step by Step

Step 1: Access the online form

The application is made through the HMRC online service. The current entry point is the targeted advance assurance gov.uk guidance page, which links to the online form through the Government Gateway. The company applies directly, or an agent can apply with the company's written consent. If applying through an agent, the agent must use their own Government Gateway credentials.

Step 2: Select your topic area

Choose one of the four permitted areas for this application. You will not be able to change the topic once the form is submitted. If you want assurance on two different areas, you must submit two separate applications (the maximum permitted under the pilot).

Step 3: Describe the project and state your position

Set out the project clearly: the field of science or technology, the advance being sought, the uncertainties that existed, and how you resolved or are attempting to resolve them. Then state your specific position on the assurance topic you have chosen. For example, on the R&D definition topic: "We contend that this project qualifies because..." followed by specific technical reasoning.

Step 4: Submit and await contact

After submission you cannot amend the application. HMRC will review the submission and contact the company, usually by phone, to discuss the details before issuing a written decision. The target is 40 calendar days from submission of complete information. If HMRC needs more information the clock pauses while you provide it.

Step 5: Receive the decision letter

If HMRC grants assurance, you receive a letter confirming what has been agreed, the company's obligations (in particular, the obligation to notify HMRC if the R&D activities change materially), and the scope of the assurance. The assurance covers the first three R&D claims filed after the letter date.

What Assurance Actually Gives You

Advance assurance is not a rubber stamp for the whole claim. It is a written confirmation on one specific point. When you later file the claim, you still need to submit a complete Additional Information Form, include the correct costs, and follow all other claim rules.

Where assurance is genuinely useful is in situations where you have a material doubt about one aspect of the claim and that doubt is holding up either the R&D activity itself or the decision to claim. Common examples:

• A software company uncertain whether its machine learning project is advancing the underlying science or just applying existing techniques
• A manufacturer using an overseas laboratory for specialist materials testing it cannot replicate in the UK
• A startup that has contracted out all its development work and is unsure whether it or the contractor should claim
• A high-growth business approaching the PAYE cap threshold and wanting to confirm whether the exemption applies

In each case, assurance removes the uncertainty on that specific point. The company can then plan its claim with confidence. If HMRC refuses assurance, the company learns HMRC's objection at the application stage rather than at enquiry stage, which is a better position to be in even if the answer is unwelcome.

If Your Application Is Refused

A refusal is not a bar to making the underlying R&D claim. You can still submit the claim in the normal way. However, Two things follow from this:

First, you cannot appeal the refusal and you cannot reapply for advance assurance on the same project. The decision is final within the pilot.

Second, a refusal does not mean HMRC will automatically open a compliance check when you do file the claim. The advance assurance process is separate from the compliance process. That said, if HMRC has told you during the assurance process that it does not accept your position on the R&D definition, filing a claim on the same basis without addressing those concerns is a risk. A specialist adviser can help you understand whether there is a way to restructure the claim or the project documentation.

Uplift Tax introduces companies to HMRC-registered R&D specialists who can advise on whether the advance assurance route is right for your situation, help prepare the technical narrative, and manage the application on your behalf if needed. Get a free assessment to discuss your position.

The Pilot's Purpose and What Comes Next

HMRC has been explicit that this is a test. The programme will measure demand, identify which of the four topics companies most value assurance on, and assess the resource needed to deliver a wider service. Applicants are asked to complete a short feedback survey and may be invited to a follow-up call. That feedback will inform whether and how a permanent advance clearance service is introduced after the pilot ends in May 2027.

The background to the pilot is the consultation on R&D advance clearances published by HMRC. Responses to that consultation called for accessible, project-specific clearances. The 12-month pilot is HMRC's first practical test of whether that is workable at scale.