Can a Manufacturing Company Claim R&D Tax Credits for Incremental Improvements?

If you run a manufacturing business in the UK and your team spends time tweaking production lines, testing new materials, or improving tooling to make things faster or better, you might be sitting on a legitimate R&D tax credit claim. The misconception that R&D credits are only for pharmaceutical labs or software developers is costing manufacturers real money.

As ICAEW-qualified accountants, we see manufacturing clients claim successfully for work that looks like day-to-day problem solving. The key is understanding where routine troubleshooting ends and qualifying R&D begins. This article explains exactly where that line sits for a manufacturing company doing incremental improvement work.

What Actually Qualifies as R&D in Manufacturing?

HMRC's definition of R&D for tax purposes is broader than most business owners assume. The test is not whether you invented something world-changing. The test is whether your project sought to resolve a scientific or technological uncertainty that a competent professional in your field could not readily resolve.

For a manufacturing company, that means you need to show that you were trying to achieve an advance in your field, not just a commercial improvement for your own business. But here is the critical detail. An advance in your field can be specific to your industry sector. If you are a precision engineering firm in Sheffield developing a new method for machining a particular alloy, and no one in your sector has solved that problem before, that is an advance in your field.

The advance does not have to be global. It has to be new to your industry, not new to you personally. If you copied a method from a trade journal or a supplier, that is not R&D. If you worked through multiple iterations, testing and failing, to arrive at a solution that does not exist in the public domain, that likely is R&D.

Why Competitors Overlook Production Line Tweaks

The accounting and advisory firms that dominate R&D marketing tend to focus on software and life sciences. Those sectors produce clean, documentable projects with clear technical uncertainties. Manufacturing improvements are messier. They happen on the shop floor, documented in maintenance logs and shift notes, not in formal project files.

This is where an r&d tax credit specialist who understands manufacturing makes the difference. A generalist accountant might look at your production line improvements and see routine maintenance or operational efficiency. A specialist sees a series of technical projects that each potentially qualify for relief.

Consider a concrete example. A manufacturer of automotive components in Birmingham was struggling with surface finish defects on a new aluminium alloy. The standard machining parameters produced unacceptable scrap rates. Over six months, the production engineer tested 14 different combinations of spindle speed, feed rate, coolant pressure, and tool geometry. The solution they eventually found is now used across their entire product line. Their previous accountant told them this was just process optimisation. An R&D specialist identified three distinct qualifying projects within that work.

The Three Tests Your Manufacturing Project Must Pass

HMRC applies three tests to every R&D claim. If your project passes all three, the costs qualify. If it fails any one, it does not.

1. Was there a technical uncertainty?

You must have been unable to determine the solution using standard practice. If you knew what to do but just had not done it yet, that is not R&D. If you tried something and it did not work, and you did not know why, that is a technical uncertainty.

Examples of technical uncertainty in manufacturing:

• You cannot achieve required tolerances with existing tooling and do not know which alternative will work.
• A new material behaves unpredictably under heat treatment and standard reference sources offer no guidance.
• Your automation system produces intermittent faults that cannot be diagnosed using standard diagnostic procedures.

2. Was there an attempt to overcome that uncertainty?

You need to show that you actively worked on the problem. This means records of trials, test results, design iterations, or computational modelling. It does not require formal project documentation. Emails between engineers, production logs, and quality control reports all count.

3. Did the work constitute an advance in your field?

This is where many manufacturing claims fall down, not because the work was not an advance, but because the company cannot articulate why it was an advance. You need to explain what was already known in your industry and why your solution goes beyond that.

If you developed a new welding technique that reduces distortion in thin-gauge stainless steel, and that technique is not described in any published standard or trade literature, you have an advance in your field. The fact that your competitors could replicate it once you showed them is irrelevant. The advance is the discovery, not the commercialisation.

What Manufacturing Costs Can You Claim?

If your project qualifies, you can claim relief on the following costs:

• Staff costs: Salaries, employer NI, and pension contributions for employees directly involved in the R&D. This includes production engineers, technicians, and supervisors who spend time on qualifying projects. You apportion their time based on actual hours worked on R&D.
• Consumables: Materials used up or transformed in the R&D process. If you ran 200 test batches of a new polymer blend and scrapped them, the raw material cost is claimable. If you produced saleable goods during the testing, you must deduct the sale proceeds.
• Software: Licences for CAD, simulation, or analysis software used directly in the R&D.
• Subcontractors: If you paid an external specialist to help resolve the technical uncertainty, their costs can be claimable. The rules differ depending on whether the subcontractor is connected to your company.
• Externally provided workers: Agency staff working under your direction on qualifying projects.

You cannot claim for capital equipment, land, or routine production costs. If you bought a new CNC machine to produce the parts, the machine itself is not claimable, but the consumables used in the test runs are.

Common Manufacturing R&D Projects That Qualify

Based on claims we have prepared for manufacturing clients across the UK, these project types frequently qualify:

• New material formulation: Developing a new composite, alloy, or coating with specific properties not available from standard suppliers.
• Process automation: Designing and programming bespoke automation systems where off-the-shelf solutions cannot achieve the required precision or throughput.
• Tooling development: Creating custom jigs, fixtures, or cutting tools to handle non-standard geometries or materials.
• Waste reduction: Developing processes to reduce scrap rates where the cause of waste is technically uncertain.
• Energy efficiency: Designing heat recovery or process optimisation systems that go beyond standard engineering practice.
• Quality improvement: Developing inspection or testing methods that detect defects standard methods miss.

Each of these needs to be assessed individually. A project to reduce energy consumption by installing a more efficient motor is not R&D. A project to develop a novel heat recovery system that uses waste heat to preheat feedstock at temperatures no existing system can achieve is R&D.

The Documentation You Need

HMRC does not require a specific format for R&D documentation. But they will ask questions if your claim looks high relative to your turnover or if the technical narrative is vague. The single best thing you can do is keep contemporaneous records of your technical work.

For a manufacturing company, that means:

• Production logs showing test runs and their outcomes.
• Email chains between engineers discussing technical problems and proposed solutions.
• Design drawings marked up with revisions and reasons for changes.
• Quality control reports showing defect analysis and corrective actions.
• Minutes of team meetings where technical problems were discussed.

You do not need to create new documents. You need to preserve what you already generate. The mistake most manufacturers make is throwing away test records once the problem is solved. Keep them. They are evidence of R&D.

How an R&D Tax Credit Specialist Helps

A specialist does two things a generalist cannot. First, they identify qualifying projects that look like routine work to an untrained eye. Second, they prepare the technical narrative in language HMRC will accept.

HMRC's R&D inspectors are not manufacturing engineers. They need to understand why your work was technically uncertain and why your solution was an advance. A good r&d tax credit specialist translates your engineering language into the framework HMRC uses. They ask the right questions: What did you try? Why did it fail? What did the industry know before you started? What did you discover?

At Holloway Davies, our R&D tax credit service is built around exactly this kind of technical assessment. We work with manufacturing clients across the UK, from a 4-person precision engineering shop in the Jewellery Quarter in Birmingham to a 50-employee fabrication company in the Northern Quarter in Manchester. The size does not matter. What matters is whether the work qualifies.

We also handle the corporation tax computation side. The claim is submitted through your CT600 (corporation tax return) using the relevant boxes. For accounting periods starting on or after 1 April 2024, the merged R&D scheme applies. Loss-making companies that spend more than 30% of their total costs on R&D can use the enhanced R&D Intensive Scheme (ERIS). Profitable companies claim a payable credit or reduced corporation tax liability depending on their circumstances.

The Cost of Not Claiming

Consider a manufacturing company with £80,000 of qualifying R&D staff costs and £20,000 of consumables. Under the current rules, that company can claim a payable tax credit or reduce its corporation tax liability significantly. For a profitable company paying 25% corporation tax, the saving is roughly £25,000. For a loss-making intensive company, the payable credit can be even higher.

If you have been doing this work for three years and not claimed, you have potentially left £75,000 on the table. You can amend previous corporation tax returns going back up to two years from the filing date. For the current year, you include the claim in your return.

Common Misconceptions

Let me address the objections we hear most often from manufacturing directors.

"We didn't invent anything new." You do not need to invent. You need to resolve a technical uncertainty. If you solved a problem your industry had not solved before, that is enough.

"It was just trial and error." Trial and error is a valid R&D methodology. HMRC recognises systematic experimentation as qualifying activity. The key is that you were testing hypotheses, not guessing randomly.

"We used standard equipment." The equipment is irrelevant. What matters is what you did with it. Using a standard CNC machine to develop a non-standard machining process is R&D.

"Our accountant said we don't qualify." Many general practice accountants are not familiar with manufacturing R&D. They see process improvement and assume it is routine. If your accountant does not have an r&d tax credit specialist on their team, get a second opinion from someone who does.

Next Steps

If you think your manufacturing company might have qualifying R&D projects, the first step is a review of your technical work over the last two to three years. Pull together your production logs, project notes, and any records of testing or experimentation. If you have a list of problems your team solved that involved uncertainty and experimentation, you have a starting point.

Our team at Holloway Davies offers an initial R&D review where we assess your projects against HMRC's criteria. We do not charge for the review. If we see qualifying work, we will prepare the claim on a no-claim-no-fee basis. If we do not see qualifying work, we will tell you honestly and explain why.

You can read more about how R&D tax credits work on our site, or contact us directly to start the review process. If your manufacturing company is based in or around our locations, we can visit your site to review the work in person.

Do not let the misconception that R&D is only for labs and coders cost your business money. If your team is advancing what is possible in your field, the relief is there for you to claim.