# Attention November 2025 year-end companies – Submit your ANF before the end of May!

> If this is your client’s first time claiming R&D tax credits (or they have not claimed in the last three years), they have to notify HMRC within six months of their year-end. What does this mean? If your client has…
> URL: https://randduk.com/advice/attention-november-2025-year-end-companies-submit-your-anf-before-the-end-of-may/
> Last modified: 2026-06-02T08:30:01+00:00

If this is your client’s first time claiming R&D tax credits (or they have not claimed in the last three years), they have to notify HMRC within six months of their year-end.

## **What does this mean?**

If your client has a financial year-end in November 2025, the Advanced Notification Form (ANF) deadline is May 31, 2026 – it will be here before you know it!

Even if your client has conducted legitimate R&D activities, failure to submit the ANF when required will invalidate the claim.

## **ANF deadlines in 2026**

Here are the deadlines to notify HMRC about your client’s intention to claim R&D tax relief:

**Accounting year-end****Deadline**30 November 202531 May 202631 December 202530 June 202631 January 202631 July 202628 February 202631 August 202631 March 202630 September 202630 April 202631 October 202631 May 202630 November 202630 June 202631 December 202631 July 202631 January 2027

**Don’t miss your client’s ANF deadline! **[**Contact our team**](https://randduk.com/get-in-touch/)** today for expert R&D support.**