Key UK R&D Tax Deadlines

R&D Claim Notification (Advance Notification) Deadline
Required for first-time claimants or those who haven't claimed in over 3 years. Notify HMRC by six months after your accounting period end to maintain eligibility. 

If you’ve claimed R&D tax relief within 3 years of the last date of your claim notification period you do not need to send a claim notification form, unless any of the following exceptions apply:

• HMRC rejected your R&D tax relief claim by removing it from your Company Tax Return.
  
  
• You claimed R&D tax relief for an accounting period beginning before 1 April 2023 by amending your tax return and the amendment was received on or after 1 April 2023.

Why Track Your R&D Tax Relief Claim Timeline?

Avoid Missing R&D Credits UK
Timely claims ensure you get the full benefit of available tax credits without losing out due to late filing.


Stay Ahead of HMRC Requirements
Meet notification and claim deadlines to prevent claims from being rejected or delayed.


Improve Your Cash Flow & Planning
Early claims can boost your working capital and help with budgeting for innovation projects.


Expert Guidance & Compliance
Stay aligned with evolving UK R&D tax relief filing dates and legislation changes.

Need Help with Your R&D Tax Claim UK?

Our specialist team at Tax Advisory Partnership can:

• Calculate and track your UK R&D tax deadlines accurately
  
  
• Assist with preparing and submitting R&D tax credit claims UK
  
  
• Liaise with HMRC on notifications and claim approvals
  
  
• Maximise your eligible relief and manage compliance risks

To explore our full range of Research & Development tax services, visit the Innovation Tax Reliefs page.

📞 Don’t miss out on your R&D tax incentives –contact our R&D tax claim specialists today using the form at the bottom of this page!