If you run a manufacturing business in Northern Ireland, there’s a good chance you’re doing work that qualifies for R&D tax relief. And there’s an even better chance you’re not claiming it.
The most common reason? Manufacturers assume R&D relief is for tech companies, biotech firms, and university spin-outs. It isn’t. If your business has ever developed a new product, improved a manufacturing process, tested materials, designed bespoke tooling, or automated a production line, you’ve probably carried out qualifying R&D.
This guide explains what counts, how the relief works, and how to put together a claim that stands up to HMRC scrutiny.
What counts as R&D in manufacturing?
HMRC’s definition of R&D is based on guidelines published by the Department for Science, Innovation and Technology (DSIT). The core test is straightforward: you must be seeking an advance in science or technology by resolving scientific or technological uncertainty.
In plain English, that means you were trying to do something that wasn’t straightforward, where the solution wasn’t readily available, and where a competent professional in the field wouldn’t have been able to easily work out how to do it.
For manufacturers, this shows up in several common areas:
Process improvement
Developing a new manufacturing process, or significantly improving an existing one, often involves technological uncertainty. This includes:
- Redesigning a production line to increase throughput or reduce waste
- Developing new quality control methods for tighter tolerances
- Experimenting with process parameters (temperature, pressure, speed) to achieve a new outcome
- Overcoming bottlenecks that can’t be solved with off-the-shelf solutions
Tooling and fixturing
Designing bespoke jigs, moulds, dies, or fixtures that require iterative development to achieve the required precision or functionality. If you’ve gone through multiple design iterations to get a tool to work, the development work likely qualifies.
Materials testing and selection
Testing new materials, composites, or coatings to achieve specific performance characteristics. This is particularly common in NI’s aerospace supply chain, where material properties must meet stringent certification requirements.
Product development
Designing a new product, or substantially modifying an existing one, where the design process involves resolving technical uncertainties. This goes beyond aesthetic or cosmetic changes: the uncertainty must be technological.
Automation and integration
Developing automated systems, integrating robotics, or creating control systems that require significant problem-solving. Off-the-shelf automation that works out of the box doesn’t qualify, but adapting, customising, or integrating systems into your specific manufacturing environment often does.
The “competent professional” test. HMRC asks whether a competent professional in the relevant field could have easily resolved the uncertainty. If the answer is no, if it required experimentation, trial and error, or systematic investigation, it’s likely to qualify.
Common misconception: “We’re not doing R&D”
Let’s address this directly. We’ve worked with hundreds of NI manufacturers, and the most frequent response when we first mention R&D relief is: “We don’t do R&D. We’re a factory.”
Here’s a table of real-world activities we’ve successfully claimed for:
| Activity | Industry | Why it qualified |
|---|---|---|
| Developing a new welding process for dissimilar metals | Metal fabrication | No established method existed for the specific material combination |
| Designing a mould for a complex geometry plastic part | Plastics manufacturing | Multiple iterations needed to achieve consistent fill and surface finish |
| Reducing energy consumption in a kiln by 30% | Ceramics | Required experimental modification of firing profiles and insulation |
| Automating a manual assembly line | Electronics assembly | Integration of vision systems with robotic handling required custom software |
| Formulating a new adhesive for food-safe packaging | Packaging | Required testing against regulatory standards with no existing formulation meeting all criteria |
| Developing a CNC programme for a novel component | Precision engineering | Machining parameters and toolpath strategies required systematic experimentation |
| Creating a water treatment system for process effluent | Food manufacturing | Existing commercial systems didn’t meet discharge consent requirements |
None of these businesses had a “laboratory” or a team called “R&D.” They were solving technical problems as part of their day-to-day operations. That’s exactly what R&D tax relief is designed to support.
How the merged scheme works
From April 2024, the previous SME and RDEC (Research and Development Expenditure Credit) schemes were replaced with a single merged scheme. Here’s how it works:
| Element | Detail |
|---|---|
| Credit rate | 20% of qualifying expenditure (above-the-line credit) |
| Tax treatment | The credit is taxable, so the net benefit for a profitable company paying 25% corporation tax is 15% of qualifying spend |
| For 19% taxpayers | Net benefit is 16.2% of qualifying spend |
| Loss-making companies | Can surrender losses for a cash credit. The notional tax rate is 19%, giving a net credit of approximately 16.2% |
| R&D-intensive SMEs | An enhanced rate applies to loss-making companies where R&D expenditure is 30%+ of total expenditure. The effective credit rate is higher (approximately 27%) |
Qualifying expenditure categories
Not everything you spend on an R&D project qualifies. HMRC specifies the following categories:
Staff costs. Salaries, wages, employer NICs, and pension contributions for employees directly engaged in R&D activity. This includes the time of engineers, technicians, production staff, and managers working on qualifying projects, but only the proportion of their time spent on R&D.
Externally provided workers (EPWs). Staff supplied by agencies or third-party companies who work on your R&D projects. The qualifying amount is 65% of the payment.
Subcontracted R&D. Work contracted out to others. Under the merged scheme, you can claim for subcontracted R&D at 65% of the payment. The subcontractor doesn’t need to be a specialist R&D firm.
Consumables. Materials, utilities, and other items consumed or transformed in the R&D process. This includes raw materials used in prototyping and testing, power and water used by R&D processes, and software licences used directly in R&D.
Software. Licences for software used directly in R&D activity (CAD software, simulation tools, data analysis packages).
Cloud computing and data costs. From April 2023, costs of cloud computing, data licences, and pure mathematics research are qualifying expenditure.
What doesn’t qualify: Capital expenditure (equipment, buildings), rent, production costs for commercial sale, and work that doesn’t involve technological uncertainty. If you’re simply following established best practice or using known solutions, it’s not R&D.
Worked example: £200,000 qualifying spend
Let’s say your manufacturing company has identified £200,000 of qualifying R&D expenditure for the year. The company is profitable with taxable profits of £300,000 (before R&D adjustments).
| Step | Calculation | Amount |
|---|---|---|
| Qualifying R&D expenditure | Direct costs identified | £200,000 |
| R&D credit (20%) | £200,000 x 20% | £40,000 |
| Credit is taxable income | Added to profit for tax purposes | +£40,000 |
| Additional corporation tax on credit (25%) | £40,000 x 25% | -£10,000 |
| Net benefit | Cash saved on tax bill | £30,000 |
The net benefit is £30,000, equivalent to 15% of the qualifying spend. For a company paying the small profits rate (19%), the net benefit would be £32,400 (16.2%).
Additionally, the £200,000 of R&D expenditure is already deducted from profits as a normal business cost. The credit provides an additional benefit on top of the standard deduction.
Over three years, if your R&D spend is consistent, you’d recover £90,000 from claims alone. That’s a meaningful amount for any NI manufacturer.
The claim process
1. Identify qualifying projects
Work with your technical team (or your accountant’s R&D specialist) to identify projects that involved technological uncertainty. Document:
- What you were trying to achieve
- What the technological uncertainty was
- What work you did to resolve it
- What the outcome was (success or failure; both qualify)
2. Quantify the expenditure
For each qualifying project, calculate the staff costs, materials, subcontractor costs, and other qualifying expenditure. You’ll need:
- Timesheets or time estimates for staff involved in R&D
- Invoices for materials consumed in R&D
- Contracts and invoices for subcontractors and EPWs
- Software licence costs attributable to R&D
3. Prepare the claim
The R&D claim is submitted as part of your Corporation Tax return (CT600). Since April 2023, you must also submit an Additional Information Form to HMRC before filing the CT600. This form includes:
- A description of each qualifying project
- The qualifying expenditure by category
- Details of any agent or adviser involved in preparing the claim
4. Timelines
| Action | Deadline |
|---|---|
| Submit Additional Information Form | Before the CT600 filing deadline |
| File CT600 with R&D claim | 12 months after the end of the accounting period |
| Amend a previous claim | 12 months from the original filing deadline |
| Claim for a past period | Up to 2 years from the end of the accounting period |
Don’t miss the two-year window. If you haven’t been claiming R&D relief, you can go back and amend your last two Corporation Tax returns. For a company with a 31 March 2025 year-end, you have until 31 March 2027 to submit or amend that claim.
5. Record keeping
Keep everything. HMRC may enquire into your claim months or even years after submission. You’ll need:
- Project descriptions and technical narratives
- Contemporaneous records (emails, design notes, test results, meeting minutes)
- Timesheets or credible time allocation estimates
- Financial records supporting each cost category
- Evidence of technological uncertainty (failed prototypes, rejected approaches, iterative testing)
The Northern Ireland angle
Northern Ireland has a strong and diverse manufacturing base, from aerospace and automotive to food production and advanced materials. R&D tax relief is particularly relevant here.
Arro’s track record. We’ve helped NI manufacturers recover over £2.1 million in R&D tax relief across sectors including precision engineering, food manufacturing, plastics, and metal fabrication. Our team includes specialists who understand manufacturing processes and can identify qualifying activities that generalist accountants often miss.
Invest NI innovation support. Invest NI offers several programmes that complement R&D tax relief:
- Innovation Vouchers (up to £5,000) for feasibility studies with knowledge providers
- Technical Development Incentive for significant product or process development
- Grant for R&D for larger projects with substantial expenditure
- Collaborative R&D programmes linking businesses with research institutions
These grants can be claimed alongside R&D tax relief, though the grant amount must be deducted from your qualifying expenditure to avoid double funding.
University partnerships. Queen’s University Belfast and Ulster University both have strong engineering and manufacturing research departments. Subcontracting R&D work to a university can qualify for tax relief, and NI’s universities are experienced in collaborating with local manufacturers. The Knowledge Transfer Partnership (KTP) programme is a well-trodden path for this.
Sector-specific opportunities. NI’s aerospace supply chain (Spirit AeroSystems, Collins Aerospace, and their Tier 1/2/3 suppliers) is particularly R&D-intensive. If you’re a supplier developing new components, materials, or processes to meet OEM specifications, much of this work is likely to qualify.
Common HMRC enquiry triggers (and how to avoid them)
HMRC has significantly increased its scrutiny of R&D claims since 2023. Here’s what raises red flags.
1. Claims prepared by “no win, no fee” agents. HMRC has publicly stated that claims prepared by aggressive advisers, particularly those working on a contingency fee basis, receive closer scrutiny. This doesn’t mean you can’t use an adviser, but choose one with technical credibility and a track record of defending claims.
2. Vague or generic project descriptions. “Developing innovative solutions” isn’t a project description. HMRC wants specifics: what was the uncertainty, what did you try, what happened? Technical language is fine and expected.
3. Inconsistent staffing claims. If you claim 80% of an engineer’s time was spent on R&D, but their job description and other records suggest they were primarily on production work, HMRC will question it. Time allocations must be realistic and supportable.
4. First-time claims for multiple years. Submitting your first R&D claim covering two or three backdated years can trigger an enquiry. This is simply because HMRC wants to verify the claim is legitimate. It’s not necessarily a problem, but be prepared.
5. Claims with no failed experiments. If every R&D project succeeded perfectly, HMRC may question whether there was genuine uncertainty. Real R&D involves setbacks, failed approaches, and iterative refinement. Document these: they strengthen your claim.
6. Disproportionately large claims. If your R&D claim suddenly represents 30% of your total costs, and your industry average is 5%, expect questions. Make sure your claim is proportionate and well-documented.
How to protect yourself
- Keep contemporaneous records (don’t write technical narratives retrospectively from memory)
- Be conservative on time allocations (better to understate and defend than overstate and fail)
- Use an adviser who understands your industry
- Respond promptly and thoroughly to any HMRC enquiry
How Arro can help
Our R&D tax team works directly with your engineers and production staff to identify every qualifying project and build claims that stand up to scrutiny. We’ve recovered £2.1 million for NI manufacturers to date, and we handle the entire process from identification through to submission and enquiry defence. If you think your business might qualify, or if you’ve been told it doesn’t, get a second opinion from us.