Why This Rule Exists and Why It Traps So Many
Advance notification was introduced by Finance Act 2023 as part of HMRC's anti-abuse response to a surge in speculative and fraudulent R&D claims through 2019 to 2022. The policy intent was to prevent claim advisers from lodging retrospective R&D claims for companies that had not previously identified themselves as R&D-active, which had become a channel for both overreach and outright fraud.
The unintended consequence is that legitimate first-time claimants — early-stage fintechs and startups whose finance teams are stretched, whose R&D adviser is being appointed just as the year-end accounts are prepared, or whose R&D activity was not consciously catalogued as R&D at the time — are the most likely to miss the notification and lose the claim entirely.
Who Counts as a First-Time Claimant
The statutory test is more nuanced than "have you claimed R&D relief before". A company must file an advance notification if any of the following apply:
- It has never claimed R&D tax relief before. The obvious case.
- It has not made an R&D claim in any of the previous three accounting periods. A gap of three years without a claim brings the company back within the notification requirement.
- Its previous R&D claim was made outside the two-year statutory amendment window. If the last claim was made late by amending an out-of-time return, that claim does not count for the three-year lookback.
The three-year lookback measures back from the last day of the accounting period for which the current claim is being made. So a company with a December 2025 year-end is asking: did I claim R&D in the period ending December 2024, December 2023, or December 2022? If the answer for all three is no, notification is required for the December 2025 claim.
The Six-Month Clock, in Practice
The notification must be filed within six months of the end of the accounting period to which the claim relates. For calendar-year companies this creates a compressed timeline that catches finance teams off guard.
The specific challenge is that for a December year-end, the notification deadline (30 June) typically falls before the audit is complete, before the R&D adviser has been formally engaged for the year, and before the R&D technical narrative has been drafted. The notification form itself is short — company name, UTR, contact details, high-level description of activity — but it must be filed before the substantive claim work is done.
What the Notification Form Requires
The claim notification is submitted through HMRC's online notification form. The information required is straightforward but must be complete:
- Company and adviser details: UTR, VAT number if registered, senior R&D contact within the company, and the R&D adviser (if any) with their agent reference number.
- Accounting period covered: Start and end dates of the period for which the claim will be made.
- Summary of R&D activity: Fields, technologies, and general description of the qualifying activity. This is a summary, not a technical narrative — but it must be substantive enough that HMRC can confirm the activity is genuinely R&D-flavoured.
- Confirmation that claim will follow: A statement that the company intends to make a claim, with the anticipated scheme (merged RDEC or ERIS).
The form does not commit the company to a specific claim amount or bind the eventual technical narrative. It is a "we intend to claim" filing, not a claim itself.
"The advance notification is a procedural gate, not a substantive filing. But the procedural nature of it is why so many companies miss it — the temptation is to defer the notification until the substantive claim work is being done, at which point the six-month window has closed and the entire relief is forfeit."
The Cost of Missing It
There is no reasonable-excuse relief. HMRC's published guidance and the statutory position are unambiguous: if a company that is required to file a notification does not do so within the six-month window, no R&D claim can be made for that accounting period. The financial loss for an early-stage fintech spending £500,000 to £1,500,000 per year on qualifying R&D is between £75,000 and £400,000, depending on the scheme applicable.
Case volume through 2024 and 2025 has been substantial. HMRC's own published figures have shown thousands of claims rejected on procedural grounds where the substantive claim was otherwise valid. The professional bodies (ICAEW, CIOT) have been consistent in raising this as an unfair outcome — but the statutory position has not been softened, and neither has HMRC's operational approach.
The Operational Controls That Prevent This
Three controls, embedded in the finance calendar, effectively eliminate the risk of missing the notification.
Control One: The Year-End Trigger
At every accounting period-end, run a two-minute check: does the company plan to make an R&D claim for the just-closed period? If yes, has the company claimed R&D in any of the previous three accounting periods? If the answer to the second question is no, the notification deadline is diarised as period-end plus five months (leaving a one-month buffer before the six-month statutory deadline).
Control Two: The Adviser Engagement Timing
For any first-time claimant, engage the R&D adviser within eight weeks of period end, not at year-end audit time. This is enough lead time for the adviser to complete a preliminary scoping review and to file the notification on the company's behalf before the six-month deadline.
Control Three: The Board and Audit Committee Diarised Item
The audit committee (or the equivalent board risk committee) should have R&D notification status as a standing agenda item for the first meeting after year-end. This ensures the deadline gets independent visibility rather than sitting inside the finance function's own to-do list.
Key Takeaways
- Advance notification applies to first-time R&D claimants for accounting periods beginning on or after 1 April 2023. The deadline is six months from period end.
- "First-time claimant" includes any company that has not claimed R&D relief in any of the three previous accounting periods, or whose last claim was made outside the two-year statutory amendment window.
- Missing the notification means the R&D claim for that accounting period is forfeit. There is no reasonable-excuse relief.
- For a December year-end company, the notification deadline is 30 June — before audit sign-off and before the substantive claim work is typically done.
- Three operational controls prevent the miss: a year-end first-time claimant test, adviser engagement within eight weeks of period end, and audit-committee visibility as a standing agenda item.
- Establishing an annual claim cadence keeps the company outside the notification net entirely, which is a useful side-benefit of committing to regular R&D claim discipline.