Case Studies: Engineering Firms Claiming R&D Relief

by Adam Park | November 29, 2025

Many UK engineering firms are missing out on R&D tax relief, a government incentive that supports businesses tackling technical challenges or developing new methods. This relief isn’t limited to groundbreaking innovations - it often applies to routine problem-solving and process improvements. By identifying qualifying activities, firms can reduce corporation tax or receive cash credits, even for work done in the past two to three years.

Key Takeaways:

Eligibility: Applies to SMEs and large companies addressing scientific/technical uncertainties.
Financial Benefits: For accounting periods beginning on or after 1 April 2024, most firms claim under the merged R&D scheme — a 20% taxable expenditure credit on qualifying costs; loss-making R&D-intensive SMEs can claim more generous relief under ERIS.
Qualifying Costs: Includes staff wages, subcontractor fees, materials, and consumables.
Broader Impact: Encourages innovation, improves cash flow, and supports reinvestment.

Examples:

Shelley Engineering: Claimed through SME relief for refining designs and solving structural challenges, recovering significant costs.
Oil & Gas Subcontractor: Used RDEC to address site-specific construction hurdles, recovering over £230,000.
Specialist Manufacturer: Claimed for iterative design improvements, boosting funding for equipment and workforce training.

Proper documentation and expert guidance are essential for successful claims. Specialist advisors, like Zest R&D Tax Advisors, help firms identify qualifying activities, prepare submissions, and maximise benefits. Start by reviewing past projects and ensuring R&D tracking is integrated into daily operations. For a real-world example, see how a Welsh electrical engineering firm saved over £23,000 in R&D tax credits. Firms in construction will find sector-specific guidance in our R&D tax credits in construction overview.

Case Study 1: Steel Fabrication and Precision Engineering

Company Background and Technical Challenge

Shelley Engineering, a metalworks company with a portfolio of over 1,500 projects, operates in a field where precision and technical expertise are key to securing contracts. The company consistently developed tailored structural solutions to meet increasingly complex client demands, often pushing beyond standard fabrication methods.

What they later realised was that much of this work qualified for R&D tax relief. This case highlights how everyday design challenges in engineering can meet the criteria for such relief.

As a small to medium-sized enterprise (SME), Shelley Engineering qualified for the SME R&D Tax Relief scheme. Their work frequently involved addressing specific structural and environmental challenges, requiring scientific and engineering know-how. These tasks often demanded experimentation and innovative approaches, going beyond conventional techniques. Their main focus was on improving designs, adapting processes to meet new technical conditions, and leveraging existing knowledge to develop better solutions.

Qualifying R&D Activities and Costs

Upon reviewing their extensive project portfolio, Shelley Engineering identified that a significant portion of their work aligned with HMRC’s definition of R&D activities. These included refining designs, improving existing systems, and systematically addressing technical uncertainties.

A key takeaway here is that R&D doesn’t have to involve groundbreaking inventions. Efforts to advance a field by creating new knowledge or solving technical problems for future applications can qualify as R&D. This means even routine problem-solving, when it involves overcoming uncertainties, may be eligible.

For steel fabrication firms, a wide range of costs can be included in R&D claims. These encompass:

Salaries for engineers and project managers directly involved in R&D.
Fees for external specialists or consultants.
Consumables used in development and testing.
Materials used for prototypes and experimentation.

By working with specialist advisors like Zest R&D Tax Advisors, Shelley Engineering conducted a meticulous review of their 1,500 projects. These advisors helped identify qualifying activities and properly document the associated costs, focusing on areas where scientific or technological uncertainties were resolved through systematic investigation.

Results and Lessons Learned

Shelley Engineering successfully secured their claim by providing a detailed technical report that demonstrated how their work addressed technological uncertainties. At the time, SME-scheme claims could be worth up to around £33 for every £100 spent; for accounting periods beginning on or after 1 April 2024, relief is instead given under the merged R&D scheme as a 20% expenditure credit, with more generous ERIS rates for loss-making R&D-intensive SMEs.

This case study revealed several important lessons. First, many companies undervalue the innovative work they do. Tasks that seem routine to experienced engineers often involve solving unique technical challenges that meet HMRC’s R&D criteria. Second, proper documentation is essential. Shelley Engineering’s success stemmed from their ability to clearly outline the challenges they faced and the systematic approach they used to overcome them.

The process also delivered unexpected benefits. By reviewing their projects systematically, Shelley Engineering not only secured a substantial tax credit but also gained insights into their competitive strengths. This clearer understanding of their technical capabilities enabled them to identify R&D activities more effectively in future projects, making their claims even stronger.

The financial relief they received provided resources to reinvest in the business - whether through purchasing new equipment, hiring skilled staff, or expanding testing facilities. Perhaps most importantly, this case underscores that design improvement activities, often overlooked as eligible for R&D tax credits, can deliver significant benefits when properly documented and presented.

Case Study 2: Oil and Gas Sector Engineering

Company Background and R&D Project

A UK-based construction firm, acting as a subcontractor for a global energy provider, faced a particularly demanding groundworks and temporary support project at an oil and gas facility. The unique site constraints meant standard construction methods simply weren’t up to the task. Initially, the firm believed that relief for such challenges was confined to laboratory-based research. However, specialist advisors pointed out that their work qualified under the same criteria.

This case demonstrates that even in the oil and gas sector, engineering projects can lead to substantial R&D opportunities. The firm’s efforts focused on advancing groundworks by creating new knowledge that could be applied to similar projects in the future. As a subcontractor undertaking R&D, the company successfully claimed under the Research and Development Expenditure Credit (RDEC) scheme. This realisation allowed the firm to structure its R&D claim effectively, taking full advantage of the scheme.

Qualifying Activities and Financial Results

The project involved tackling scientific and technological uncertainties when conventional methods failed to address the risks on-site. The team had to develop and adapt processes to overcome specific technical hurdles.

Specialist advisors confirmed that the firm’s systematic efforts to resolve these uncertainties qualified as R&D under HMRC guidelines. In total, over £230,000 in costs - spanning staffing, specialist fees, and consumables - were identified as qualifying expenditure. The advisors took great care to ensure all costs were properly allocated and complied with HMRC’s strict requirements, reducing the likelihood of enquiries or penalties. While the RDEC scheme offers a lower rate of relief compared to the SME scheme, the financial outcome was still significant, showing how deeply R&D activities were embedded in the firm’s operations.

Business Benefits of the Claim

The financial return from the claim provided the firm with immediate funds, which were reinvested into future projects and workforce development. Beyond the monetary gain, the process sharpened the company’s understanding of its competitive edge and established a framework for recognising R&D activities as they occurred. This proactive approach ensures that future claims will be more comprehensive and better documented.

Perhaps most importantly, the experience reinforced the technical expertise and problem-solving abilities of the firm’s engineers. It highlighted that even routine challenges - when they require innovative solutions to address site-specific issues - can qualify as genuine R&D. This case serves as a powerful reminder that subcontractors in the oil and gas sector should not dismiss the possibility of claiming R&D tax relief for their work.

Case Study 3: Specialist Equipment and Component Manufacturing

Company Overview and Project Details

A specialist metalworks company, operating in a highly competitive sector where precision and ingenuity are key, had been heavily involved in research and development (R&D) without realising their work qualified for tax relief. Like many manufacturers, they assumed that their routine technical improvements and problem-solving efforts wouldn’t meet the criteria for relief.

Their projects revolved around refining existing designs and enhancing systems to meet increasingly stringent customer requirements. Each challenge required creative solutions that went beyond standard practices - whether it was adapting fabrication techniques for new materials or developing custom components that pushed the limits of manufacturing technology. The team meticulously documented their problem-solving approaches, tested multiple design iterations, and invested in prototyping and validation. These efforts formed the backbone of a substantial tax relief claim, prompting the company to re-evaluate its approach to innovation.

Qualifying R&D Activities and Claim Process

The turning point came when the company partnered with expert advisors, such as Zest R&D Tax Advisors, who carried out an in-depth review of their projects. The advisors identified that a significant portion of the company’s work qualified as R&D under HMRC guidelines. They demonstrated that the company had been tackling scientific and technological uncertainties through structured investigation and experimentation.

Qualifying activities included improving existing product designs when standard methods couldn’t meet heightened performance demands. The engineering team explored various material combinations, welding techniques, and fabrication processes to achieve their goals. Each iteration involved rigorous testing, measurement, and refinement - key elements that aligned with HMRC’s definition of R&D.

The claim process required detailed records of the technical hurdles faced and the resources allocated to overcome them. Eligible expenses included wages for engineers and project managers directly involved in development, fees for external specialists providing technical input, and materials consumed during prototyping and testing. By providing thorough technical reports and conducting a systematic review, the company secured a substantial tax relief claim.

Impact on Business Growth

The financial benefit from the R&D tax relief claim provided an immediate boost, offering capital that was reinvested into the business. For manufacturers focused on innovation, this relief became a vital funding source.

More importantly, the process reshaped how the company viewed its operations. They began to recognise the value of their technical problem-solving efforts and integrated R&D tracking into their day-to-day management systems. This shift ensures that qualifying activities are identified and documented in real-time, simplifying future claims and maximising potential relief.

The experience also gave the company a competitive edge. By clearly identifying and showcasing their innovative capabilities, they could better communicate their value to customers and justify higher pricing for technically demanding projects. The tax relief enabled them to invest in advanced equipment, workforce training, and ambitious projects that might have been out of reach financially.

This case highlights that R&D tax relief isn’t just for high-tech start-ups or pharmaceutical giants. Traditional engineering firms involved in iterative improvements, process enhancements, and technical problem-solving can also reap significant financial rewards - provided they work with advisors who understand both the technical details of their work and the complexities of HMRC’s R&D scheme.

Common Themes and Lessons from the Case Studies

Typical Qualifying Activities in Engineering

Many engineering firms may not realise that routine adjustments to processes or design improvements can qualify as R&D - so long as they address scientific or technological uncertainties.

Activities like tackling structural challenges or overcoming constraints in difficult environments often require engineering expertise, experimentation, and a break from standard methods. These efforts frequently qualify for R&D tax credits, even if companies don’t recognise them as such. For instance, adapting standard techniques to suit unique site conditions or creating bespoke systems for confined spaces often involves the kind of problem-solving that aligns with R&D criteria.

Other common examples include developing prototypes, conducting testing phases, and refining designs for specialised equipment or components. What matters most is that the work resolves scientific or technological uncertainties through systematic investigation, rather than merely applying known methods.

Take Shelley Engineering as an example. This specialist metalworks company reviewed over 1,500 individual projects to uncover high-value R&D tax credit claims. These kinds of activities not only push technical boundaries but also deliver meaningful financial benefits.

Financial and Business Impacts of R&D Tax Relief

Careful documentation of qualifying activities is crucial for maximising the financial benefits of R&D tax relief. These benefits can provide engineering firms with an immediate financial boost, either by reducing corporation tax liabilities or through direct refunds, which can then be reinvested into the business. For loss-making companies, HMRC offers a payable credit, making the scheme accessible to a broader range of firms.

For UK SMEs, the potential rewards are impressive. Under the merged R&D scheme (for accounting periods beginning on or after 1 April 2024), qualifying spend attracts a 20% expenditure credit, while loss-making R&D-intensive SMEs can access more generous relief through ERIS — a significant cash injection to fuel further innovation. Even smaller firms can benefit; for example, a family-owned engineering company with a £700,000 turnover and just 14 employees successfully claimed R&D tax relief with only nine days to spare before the filing deadline.

This financial relief enables companies to invest in advanced equipment, workforce training, or ambitious projects that might otherwise have been financially out of reach. Beyond the immediate monetary benefits, integrating R&D tracking into daily management systems can simplify future claims and ensure that no qualifying activity goes unnoticed. Additionally, highlighting innovative achievements can give firms a competitive edge, helping them demonstrate value to customers in a crowded marketplace.

How Specialist Advisors Help Maximise Claims

Specialist advisors play a key role in helping engineering firms unlock the full potential of R&D tax relief. By conducting in-depth technical interviews, they can uncover qualifying activities that might otherwise go unrecognised. Their expertise in HMRC guidelines ensures claims are well-structured and stand up to scrutiny. For example, well-prepared technical reports can turn overlooked enhancement activities into substantial claims. On the flip side, poor technical documentation is a frequent cause of rejected claims.

When HMRC raises enquiries, advisors can provide detailed, tailored responses to address inspectors’ concerns. One notable example is Alexander Rosse, who successfully overturned a previously rejected R&D claim and went on to file four consecutive claims for the same client without any further enquiries.

Advisors also help identify and categorise eligible costs across various areas. Engineering firms can claim for staffing costs related to engineers and project managers involved in R&D, payments to external consultants or subcontractors, and consumables used during development and testing. Even costs like cloud computing and server expenses tied to software development can be included, provided they are properly documented and categorised.

Conclusion and Next Steps

Key Takeaways from the Case Studies

Looking at the case studies above, a few recurring themes stand out. R&D activities aren't limited to just laboratory experiments. Whether you're innovating a new cofferdam system for tight construction spaces, improving sheet metal designs, or tailoring standard methods to challenging environments, these efforts often qualify if they involve tackling technical uncertainties in a systematic way.

One thing is clear: the financial rewards can be substantial. Even small, routine innovations can lead to meaningful claims, regardless of a firm's size or sector.

However, thorough documentation is crucial. Success often hinges on how well you can back up your work when presenting it to HMRC. Poor technical reporting remains one of the most common reasons for claims being rejected.

Specialist advisors can also make a big difference. They can uncover qualifying activities you might miss, categorise costs accurately, and prepare robust technical reports that meet HMRC's standards. For instance, one advisor managed to overturn a previously rejected claim and then helped the same client file four consecutive claims without any issues from HMRC.

How to Get Started with R&D Tax Relief

With these insights in mind, engineering firms can take practical steps to access R&D tax relief. Start by reviewing your recent projects for technical challenges. Did you have to develop new processes, adapt existing methods to unique conditions, or create tailored solutions to specific problems? These are often signs of qualifying activities.

Next, keep the deadlines in mind. You can claim R&D tax relief up to two years after the end of the accounting period when the R&D work occurred. However, if you’ve not claimed in the past three years, you’ll need to submit a Claim Notification Form within six months of the accounting period’s end to ensure your eligibility.

Bringing in specialist advisors early can significantly boost your chances of success. Their expertise can simplify the complexities of R&D claims. Zest R&D Tax Advisors, for example, specialises in helping engineering firms navigate this process. From identifying qualifying activities to preparing compliant submissions, their deep understanding of both engineering and HMRC requirements ensures your claim is handled correctly, maximising your financial return.

Don’t overlook potential qualifying activities, especially if your work focuses on process improvements or customised solutions. The engineering sector holds plenty of opportunities for R&D tax relief. Recognising and presenting them properly is key. For tailored advice, reach out to Zest R&D Tax Advisors at https://zest.tax to discuss your situation and begin your claim journey.

FAQs

How can engineering firms determine if their problem-solving activities qualify for R&D tax relief?

Engineering firms may be eligible for R&D tax relief if their projects tackle technical or scientific challenges and push boundaries in their field. This could involve designing new products, refining existing processes, or coming up with solutions to particularly complex problems. For a fuller breakdown, see our guide to R&D tax relief for engineering firms.

Even routine problem-solving might qualify, provided it addresses significant uncertainties and follows a structured approach to find answers. To strengthen a claim, it's crucial to keep detailed records of the challenges encountered, the methods used, and the results achieved.

What should engineering firms do to properly document their R&D activities for a successful tax relief claim?

To streamline the process of claiming R&D tax relief, engineering firms should prioritise keeping detailed and accurate records of their research and development activities. These records should capture the essence of the projects, the advancements or innovations being worked on, and the obstacles encountered along the way.

Here’s what you should document:

Project descriptions that highlight technical challenges and objectives.
Timesheets or other records tracking staff hours dedicated to R&D tasks.
Financial records detailing costs for materials, software, and subcontracted work.
Supporting evidence, such as design drafts, testing data, and progress updates.

By regularly updating these records, companies can clearly demonstrate their qualifying activities, simplifying the claims process. For expert guidance and compliance assistance, Zest R&D Tax Advisors is available to help navigate the steps.

How can working with specialist advisors help engineering firms maximise their R&D tax relief claims?

Collaborating with expert advisors like Zest R&D Tax Advisors can make a big difference when it comes to claiming R&D tax relief. Their specialised knowledge helps ensure that all qualifying activities are properly identified and documented, minimising the chance of missed opportunities or mistakes in the claims process.

By managing the detailed preparation and compliance aspects of claims, these advisors free up engineering firms to concentrate on their core work - innovation. At the same time, they help businesses make the most of the tax relief available to them.