Commencing on 1 August 2023, a fresh mandate was implemented to enhance the efficiency of the Research and Development (R&D) tax credit claiming procedure.

Enterprises aiming to avail R&D tax credits will now be required to fill out the R&D Supplementary Information Form (AIF), a crucial element designed to promote transparency, enhance the precision of claims, and expedite the processing of these claims.

In this piece, we will delve into the fundamental elements of the R&D additional form and its pivotal role in maximising the benefits of R&D tax credit claims.

The Additional Information Form

The R&D AIF stands as an enhanced documentation necessity for all R&D tax credit claims.

Its purpose is to furnish in-depth information pertaining to the R&D activities, their associated expenses, and the substantiating evidence.

This supplementary form complements the existing claim submission process and serves to encompass all pertinent data. By doing so, it equips tax authorities with the essential details required to make informed judgments during the processing of R&D tax credit claims.

Key features of the form

Comprehensive R&D project description

This section of the form necessitates businesses to furnish a detailed depiction of the R&D project. This includes delineating the project’s objectives, methodologies, technological uncertainties, and elements of innovation. The primary goal is to provide HMRC with a thorough comprehension of the project’s essence, enabling precise evaluation of its suitability for R&D tax credits.

Detailed breakdown of qualifying R&D expenditures

Businesses will need to present an exhaustive breakdown of the eligible R&D expenses incurred throughout the project. This encompasses both direct costs, such as employee salaries, materials, and expenses related to subcontractors, as well as indirect costs, including overheads and utility charges. By providing a transparent breakdown, businesses can reinforce their claims with proper documentation, ensuring precision and adherence to regulations.

Supporting documentation and evidentiary material

To bolster their claim, businesses may opt to submit pertinent supporting documentation, such as project plans and experimental records. These records function as substantiating evidence of the R&D activities conducted, further validating the claim. They also offer a comprehensive overview of the project’s scope and its broader impact.

Collaborative endeavours and partnerships

In instances where the R&D project involves collaborative efforts with external entities, such as research institutions, universities, or other businesses, the AIF mandates that businesses disclose information regarding these partnerships. This disclosure helps HMRC assess the collaborative dimension of the project, ensuring that any associated costs and advantages are accurately reflected in the claim.

What are the benefits?

Enhanced precision and streamlined processes

Through the provision of thorough project particulars, expenditure breakdowns, and supporting records at the outset, the AIF markedly improves the accuracy of claims. This, in turn, minimises the necessity for additional information requests and trims down processing time, resulting in a more efficient and simplified R&D tax credit claiming process.

Heightened transparency and adherence

This alteration underscores the values of transparency and adherence to R&D tax credit regulations. It empowers businesses to offer a comprehensive account of their R&D undertakings and the accompanying costs, ensuring that claims are underpinned by precise and dependable data. In doing so, it fosters responsible utilisation of the R&D tax credit incentive while upholding the program’s integrity.


The rollout of the R&D Additional Information Form started on 1 August 2023 and signifies a significant stride towards formalising the R&D tax credit claiming process. This augmented documentation requirement is a pivotal step in ensuring transparency, precision, and adherence in R&D tax credit claims.

It’s important to note that this requirement applies to all submissions made from 1 August 2023, regardless of the applicant’s year-end date. As this entails additional work beyond the standard R&D report, clients may observe an overall increase in the cost of R&D services, as it becomes imperative to adequately support companies in navigating the ever-evolving tax relief schemes. However, there may be elements of overlap resulting from this legislative change.

While some businesses and agents may already be operating at these high standards, this development is primarily aimed at those who may have previously fallen short of these requirements.

It establishes clear guidelines for the necessary supporting evidence, ensuring a more uniform approach. For many, this will align with their usual practices in gathering data annually. Still, for some, it might necessitate additional effort to comprehensively substantiate every facet of their claim.

If you would like to explore these changes further and understand their implications for your claim, contact Williamson & Croft today.