CNF Deadline Calculator
Check if you need to submit a Claim Notification Form and calculate your exact deadline. First-time R&D claimants must submit a CNF or lose their entire claim.
What is CNF?
The Claim Notification Form is a mandatory notification to HMRC required before making an R&D tax relief claim. Introduced in April 2023, it must be submitted within 6 months of your accounting period end.
3-Year Exemption
If you've claimed R&D tax relief in any of the previous 3 accounting periods, you may be exempt from the CNF requirement. Our calculator checks this automatically.
Need Help?
Our R&D tax specialists are here to help
6-Month Window
You have exactly 6 months from your accounting period end to submit your CNF. No extensions.
Miss It, Lose It
If you miss the CNF deadline, you cannot claim R&D tax relief for that period. Full stop.
We Handle It
Our specialists ensure your CNF is submitted correctly and on time. No stress, no missed deadlines.
Not Sure About Your CNF Status?
Our R&D tax specialists can review your situation and ensure you don't miss any critical deadlines.