In limited circumstances, and it helps to separate three different things that all get called advance assurance. Only one of them is HMRC’s view on a whole claim; the other two are narrower than most companies assume, and none of them removes the need to get the claim itself right.
Three routes, and what each one actually gives you
Full claim advance assurance is the substantial one. It covers an eligible first-time claimant’s whole claim and, where agreed, applies to the company’s first three accounting periods. That is real comfort for a company about to commit to a development programme and wondering whether any of the spend will attract relief. It is also tightly restricted: the company must be an SME making its first R&D claim, with turnover below £2 million and fewer than 50 employees, and where the company sits in a group, no linked company can have claimed before.
The Targeted Advance Assurance pilot is narrower. Announced at the Autumn Budget 2025 and launched on 18 May 2026 to run until May 2027, it is voluntary and gives HMRC’s view on up to two areas of a claim rather than the claim as a whole — applied for one project and one area at a time, from four defined areas: whether a project meets the R&D definition, overseas expenditure, contracted-out relief, and exemption from the PAYE and National Insurance contributions cap. The significant difference from the older service is who can use it: companies that have claimed for earlier periods qualify, provided they have not yet claimed for the period in question. The consultation behind it raised mandatory clearances; the government has so far gone no further than this voluntary pilot. We set out what the pilot covers, and who it suits, in our note on the Targeted Advance Assurance pilot.
Third, and often confused with the other two, HMRC’s online R&D qualification checker has been available since September 2025. It tests a project against the definition and gives a non-binding result. It is not assurance and commits HMRC to nothing — though HMRC does say that where your answers rest on the project’s facts and you can support them, it is unlikely to disagree, so a saved result is worth keeping. Use it to orient yourself, not to conclude.
What assurance does not cover
This is where the comfort gets overestimated. The targeted pilot answers the defined questions you put to it and touches nothing else, so your cost calculations remain entirely yours to get right. Full claim assurance does cover costs — but on the basis you described at application, so a claim whose costs depart from that description sits outside what was agreed. Either way, costs are where a great many claims come apart: staff time apportioned on assumption rather than evidence, or a supplier treated as a subcontractor when the contract says something else entirely.
Nor does assurance cover the compliance mechanics. Claim notification still has to be filed within its deadline where it applies, and missing it invalidates the claim however well the projects qualify. HMRC’s view that your work is R&D does not file your forms for you.
And the assurance is conditional, with the condition doing the work. HMRC’s manual says that where it agrees the relief applies, it will guarantee the claim is accepted — as long as the claim is in line with what was discussed and agreed in the application. Depart from the application and the guarantee does not follow you: HMRC may check that the claim you file matches what you applied for. A refusal cannot be appealed — nor can you apply again.
So a company can hold assurance and still submit a claim that fails, because the qualification question and the claim question are not the same question. Our guide to what counts as qualifying R&D deals with the first. The rest is preparation, evidence and arithmetic, and it is all still yours to get right.
Where this leaves you
If you have never claimed, it is worth checking whether the advance assurance scheme is open to you before you file. If you have claimed before and one point is genuinely troubling you — a borderline project, a contested cost category — the Targeted Advance Assurance pilot may be the route to close it down. In most cases, though, the practical answer is not assurance at all. It is a claim built so that the qualification argument, the costs and the compliance steps each stand up on their own.
We will tell you which of those routes fits your situation, and we will tell you plainly when the answer is none of them.
Written by Matthew Jones ACA CTA. Last reviewed July 2026.
Sources
- Check if you can apply for advance assurance — the two services and who each is for.
- Apply for full claim advance assurance — the first-claim service’s conditions and process.
- Apply for targeted advance assurance — the pilot’s four areas, exclusions and process.
- CIRD80520 — the conditional acceptance guarantee where a claim matches the agreed application.
This page describes the rules as they stood at the review date above, as general information rather than advice on your circumstances. For how that distinction works, see our terms; for an answer on your own facts, talk to us.