RDEC and Consumables: What You Need to Know

The RDEC scheme lets UK businesses claim tax relief for R&D expenses, including consumables like materials, water, fuel, and power. As of 1 April 2023, the gross credit rate increased to 20%, offering a net benefit of 15–16.2% after tax. However, consumables that form part of products sold cannot be claimed. Proper classification of costs is vital to avoid rejected claims or penalties.

Key points you need to know:

• Qualifying consumables: Items used up or transformed during R&D (e.g., chemicals, electricity for testing).
• Exclusions: Consumables in sold products, software, machinery, or land costs.
• PAYE/NIC cap: The credit is limited by payroll costs for R&D staff.
• Grant-funded projects: Only the unfunded portion of costs can be claimed.
• Compliance: Maintain detailed records linking expenses to R&D activities.

With the higher RDEC rate, understanding these rules can maximise your claim while staying compliant with HMRC guidelines.

What Qualifies as Consumables Under HMRC Guidelines?

Understanding the definition of consumables provided by HMRC is essential for making accurate RDEC claims.

HMRC Definition of Consumables

HMRC defines consumables as materials or items that are used up or transformed during R&D activities. This includes resources like water, fuel, and power that are physically or chemically altered during the process. For example, propane gas burned and used in a manufacturing process, or chemicals undergoing reactions during laboratory experiments, would both meet the criteria. Similarly, materials that are physically changed during prototype development also qualify.

To count as consumables, these items must be used in activities that qualify as R&D for tax purposes, including indirect activities that support the main R&D work. For instance, electricity used to power testing equipment or water employed in cooling systems during experiments can qualify if they are directly linked to the R&D project. HMRC also differentiates between consumable items and consumable stores, with specific rules depending on whether the expenditure occurred before or after 1 April 2004. For most current claims, the focus is on whether the items are genuinely consumed or transformed during the R&D process.

Items That Don't Qualify as Consumables

HMRC provides clear guidelines about what doesn’t count as consumables to help businesses avoid errors in their claims.

Software is not considered a consumable because it isn’t physically consumed or transformed during R&D. While software costs may still qualify for R&D relief, they must be evaluated separately, and only the portion used for R&D can be claimed.

Capital expenditure on items with long-term value, such as machinery, equipment, or vehicles, also falls outside the consumables category. For example, a specialised testing machine purchased for R&D is treated as a capital asset. However, the electricity used to power that machine during testing does qualify as a consumable expense.

Other exclusions include land, rent, and business rates, which cannot be claimed as consumables under RDEC rules. Similarly, patents and trademarks are explicitly excluded from this category.

Common Examples of Qualifying Consumables

Consumables that qualify often include a broad range of materials and utilities used across various industries. For example, laboratory materials like chemicals, reagents, and materials incorporated into prototypes during development are common qualifying items.

Energy costs are another significant category. Electricity used to power testing equipment, light and heat in laboratories, and fuel consumed during trials all count as qualifying expenses. For instance, if you conduct stress tests on a new product design that require substantial electricity, the cost of that electricity qualifies.

Water used during production processes for R&D also qualifies, as long as it is consumed or transformed as part of the work. Similarly, raw materials used to create test samples or components that are modified during testing are eligible expenses.

For example, if your company spends £2,000 on materials and £500 on utilities for R&D, the total qualifying consumable expense would be £2,500. Understanding these details is key to maximising the financial benefits of your R&D claims.

RDEC Rates and Financial Benefits

Understanding the current rates and how credits are calculated is key to maximising your claims under the RDEC scheme. Recent changes have significantly influenced the amounts companies can claim back on qualifying R&D expenses.

Current RDEC Rates

As of 1 April 2023, the RDEC scheme offers a gross credit rate of 20% for qualifying R&D expenditure. This is an increase from the previous rate of 13%, which applied to expenses incurred up to 31 March 2023.

For example, if your company spends £100,000 on qualifying consumables - such as materials, water, fuel, or power used directly in R&D - you would now receive a gross credit of £20,000. Before April 2023, the same expenditure would have generated a credit of £13,000. For expenses that span 1 April 2023, a mixed rate will apply, splitting the calculation between the 13% and 20% periods.

Next, let’s break down how these gross rates translate into actual financial benefits.

How Net Benefits Are Calculated

Although the gross credit rate is 20%, the actual benefit you receive is reduced because the RDEC credit is taxable. Depending on your company’s Corporation Tax rate, the net benefit usually falls between 15% and 16.2% for expenditure incurred on or after 1 April 2023.

• For companies with profits exceeding £250,000 (subject to the 25% Corporation Tax rate), the net benefit is around 15%.
• For companies with profits up to £50,000 (paying the 19% small profits rate), the net benefit increases to approximately 16.2%.

Here’s how the calculation works in practice:

1. The gross RDEC credit is first offset against your Corporation Tax liability.
2. A notional tax rate of 25% is applied to the remaining balance, regardless of your tax position.
3. The credit is capped at the total value of PAYE and National Insurance contributions (NICs) for workers involved in the R&D claim. Any excess is carried forward for future claims.

For instance, if your company incurs £400,000 in qualifying consumable expenses, the gross RDEC credit would be £80,000 (20% × £400,000). After applying the 25% notional tax rate, the net credit would be £60,000. However, if your PAYE and NIC costs total only £50,000, the remaining £10,000 would be carried forward to the next claim period.

If your company is loss-making and lacks sufficient Corporation Tax liability to offset the credit, you can still benefit financially. In such cases, HMRC will issue a payable credit directly. As explained by Zest.tax:

"If you are loss making you will receive a payable credit from HMRC."

Unused credits can also be applied in other ways, such as group relief, offsetting other HMRC liabilities (like VAT or PAYE), or being paid as a cash credit if your company remains a going concern.

How Corporation Tax Rates Affect RDEC Claims

Changes in Corporation Tax rates directly influence the net benefit derived from RDEC claims. Since 1 April 2023, the main Corporation Tax rate increased from 19% to 25% for profits over £250,000, while the 19% small profits rate remains for profits up to £50,000.

The table below illustrates how different rates and time periods affect net benefits:

While the 25% Corporation Tax rate reduces the net credit, the higher gross RDEC rate of 20% still offers a better overall benefit compared to the previous scheme.

When preparing your R&D claims, it’s essential to track the dates of your expenditure. Rates and tax implications vary significantly before and after 1 April 2023. Additionally, knowing your profit levels will help you accurately calculate the final credit you’re entitled to for consumables and other qualifying costs.

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Special Rules for Consumables in RDEC

When it comes to the Research and Development Expenditure Credit (RDEC), consumable expenses are subject to specific rules that can influence the size of your claim. Understanding these rules is key to making the most of your claim while staying compliant with HMRC guidelines.

Grant-Funded Projects and Subsidies

If your project is grant-funded, you can only claim the portion of consumable costs not covered by the grant. For example, if a grant funds 30% of your project costs, you can claim RDEC on the remaining 70% of eligible expenses.

Let’s break this down: suppose your total qualifying consumable costs are £800,000, and 30% is funded by a grant. In this case, you can claim RDEC on £560,000 (70% of £800,000). Similarly, if water, fuel, and power costs total £200,000 and a grant covers 40% of overall project costs, you can claim RDEC on £120,000 (60% of £200,000).

From 1 April 2024, companies will still be able to claim R&D tax relief on subsidised projects, but proportionality rules will remain to ensure that costs aren’t claimed twice.

To stay compliant, it’s crucial to maintain detailed records. These should include the grant amount, total project costs, and calculations showing the portion of costs not covered by the grant. Such documentation is essential during HMRC checks to demonstrate that your claim is accurate.

PAYE/NIC Cap and Subcontracted R&D

The PAYE/NIC cap limits the RDEC credit to the total PAYE and National Insurance Contributions paid for employees involved in the R&D work. This means that even if your consumable expenses are high, the credit cannot exceed your payroll costs for the R&D team.

This restriction can be particularly challenging for companies with significant material costs but small R&D teams. For instance, a manufacturing company working on new materials might spend heavily on consumables while employing only a few researchers. In such cases, the PAYE/NIC cap could limit the amount of credit available in the current period.

Subcontracted R&D introduces additional complexities. For accounting periods before 1 April 2024, payments for independent R&D are eligible if the recipient is an unconnected qualifying body, individual, or partnership with no corporate members. However, changes are coming with the merged scheme from 1 April 2024, affecting how payments to subcontracted activities and externally provided workers are treated.

If consumables are used in subcontracted R&D, it’s important to document which costs relate to in-house versus outsourced activities. The rules and allowable percentages for these costs can differ, so maintaining clear distinctions is essential for accurate claims.

Notional Tax Rate and Carryforward Rules

The notional tax rate of 25% is applied during Step 2 of the RDEC calculation. This ensures consistent treatment for both profit-making and loss-making companies, regardless of their financial position or Corporation Tax liability.

Here’s how it works: after reducing your Corporation Tax liability in Step 1, the remaining RDEC credit is taxed at the 25% notional rate. Any excess credit is carried forward to offset future Corporation Tax liabilities.

If there’s still credit left after all seven steps, you have options for how to use it. You can:

• Relieve it within a group,
• Offset it against other HMRC liabilities like VAT or PAYE,
• Or receive it as a cash payment, provided your company is still operating as a going concern.

For companies with limited tax liabilities or those operating at a loss, this flexibility can help spread the benefits of R&D investment over multiple years. To make the most of this, track your PAYE/NIC costs throughout the year to estimate potential caps and plan how to use excess credits in future periods. By doing so, you can optimise the long-term benefits of your R&D efforts while staying compliant with HMRC rules.

These special considerations play a critical role in ensuring your RDEC claims are accurate and compliant, setting the groundwork for effective HMRC reporting in future periods.

Meeting HMRC Compliance Requirements

When it comes to R&D tax relief, HMRC expects detailed records for every pound claimed, especially for consumables. Their October 2023 Guidelines for Compliance outline exactly what evidence is needed, making it crucial to maintain thorough documentation right from the start of your R&D project.

Required Documentation and Evidence

Keep all invoices and receipts for consumables, ensuring they clearly show the date, supplier, description, and cost. Additionally, you’ll need to explain how each consumable supports qualifying R&D activities. This includes outlining the project's objective, the scientific challenges addressed, and how the consumables were used during testing. Proper classification of consumables is equally important to avoid compliance issues.

It’s also necessary to separate qualifying consumables from those that don’t meet the criteria. For instance, under Section 1126A(2) of the Corporation Tax Act 2009, consumables that form part of items sold cannot be claimed if the expenditure occurred on or after 1 April 2015. Clear records of apportionment are essential here.

For projects funded by grants, you’ll need to document the grant amount, the total project costs, and which costs weren’t covered by the grant. Timesheets and staff records that link employees to specific R&D projects are also vital for correctly applying the PAYE and NIC cap.

Using a tracking log can simplify things. Record details like the date, supplier, item description, cost, and the related R&D project. This not only reduces compliance risks but also makes preparing claims much easier. With well-maintained records, your tax return process becomes far more straightforward.

Completing Your Tax Return

When filing your Corporation Tax Return for an RDEC claim, you’ll need to follow the seven-step RDEC calculation process. For periods starting on or after 1 April 2023, calculate the gross RDEC credit at 20% of qualifying consumable expenditure. This credit is then processed through several stages:

1. First, it reduces your Corporation Tax liability.
2. Next, a notional tax rate of 25% is applied to any remaining credit.
3. The PAYE and NIC cap is then introduced, ensuring the RDEC credit doesn’t exceed the total PAYE and National Insurance contributions for workers involved in the R&D project. Any credit above this cap is carried forward to future periods.

Make sure to clearly separate fully qualifying consumables from those requiring apportionment. If your accounting period spans 1 April 2023, you’ll need to divide consumable expenditure between the old 13% rate and the new 20% rate, calculating the benefit for each portion separately.

The net benefit of the RDEC credit depends on your Corporation Tax rate. For companies with profits up to £50,000, the Corporation Tax rate is 19%, leading to a net benefit of around 15%. For those with profits over £250,000, the rate rises to 25%, resulting in a net benefit of about 16.2%. Companies with profits falling between these thresholds can benefit from marginal relief.

Once you’ve completed the seven steps, any remaining RDEC credit can be used in several ways: it can be group relieved, offset against other HMRC liabilities (such as VAT or PAYE), or even received as a cash payment if your company is a going concern. Accurate compilation of your return is key, and professional support can further ensure compliance.

Working with R&D Tax Advisors

Navigating RDEC compliance can be complex, particularly when it comes to consumables. This is where expert guidance becomes invaluable. R&D tax advisors can help you interpret the rules around consumable qualification and ensure your documentation aligns with HMRC’s requirements.

Zest R&D Tax Advisors are specialists in R&D tax relief and Patent Box claims. Their expertise can help you identify qualifying activities and costs, clarify how consumables fit into the RDEC framework, and ensure your records meet compliance standards.

"When we started talking to Zest about R&D Tax it was clear they understood how to put in an effective claim. In the past we have used a third party company to handle our R&D Claims but it was so much easier …. with their structured approach to deciding what is eligible, how to break down the costs of the work that would make up the claim, and present the claim in a clear and unambiguous way." – George Smith, MD, Walford Timber Ltd

For companies with complex R&D projects - whether involving multiple consumable types, grant-funded elements, or consumables forming part of saleable products - seeking expert advice is a smart move. Advisors can review draft claims, identify potential compliance gaps, and even represent you during HMRC enquiries. This level of review complements solid documentation and accurate tax returns, helping you optimise your RDEC benefits.

If you’re new to RDEC or have significant consumable expenditure, engaging advisors early ensures your claims are accurate and compliant while reducing audit risks. Advisors typically collaborate with your company’s accountant to gather essential financial details, such as annual accounts, corporation tax computations, and payroll data, guiding you through the RDEC claim submission process.

Strong internal records are key to a smooth and successful R&D tax claim. Advisors can help you set up efficient record-keeping systems from the beginning, saving time and effort in the long run.

Before submitting your claim, remember to complete the Additional Information Form (AIF) digitally for HMRC. If you haven’t made an R&D claim in the past three years, submit a Claim Notification Form within six months of the end of the accounting period. This prevents you from being barred from claiming and extends the submission deadline to two years after the period’s end.

Conclusion

Grasping how consumables factor into RDEC claims is crucial for maximising tax relief while staying compliant with HMRC regulations. The distinction between qualifying and non-qualifying consumables can have a noticeable effect on the value of your claim. With the gross RDEC rate set at 20% for expenditure incurred from 1 April 2023, this translates to a net benefit of roughly 15% to 16.2%, depending on your corporation tax rate.

Qualifying consumables include materials, water, fuel, and power that are consumed or transformed during R&D activities. However, consumables that become part of saleable products are excluded. This distinction plays a direct role in determining the financial benefits your business can secure through RDEC claims.

For instance, a well-prepared claim on qualifying consumable costs can result in considerable net benefits. However, complexities such as the 25% notional tax rate and the PAYE/NIC cap require careful planning, especially when dealing with accounting periods.

Keeping thorough documentation is key to a strong claim. Detailed records that clearly link consumable purchases to specific R&D activities, proper apportionment between qualifying and non-qualifying items, and up-to-date project information all contribute to the robustness of your claim. For businesses with intricate R&D projects involving various types of consumables or grant-funded elements, maintaining these records from the start can save significant time and effort when preparing claims.

To make the most of your RDEC benefits, strategic planning around consumable expenditure is essential. Coupled with expert advice, this ensures all eligible costs are claimed while meeting HMRC standards. Whether managing accounting periods that span rate changes or addressing the impact of the PAYE/NIC cap on credit timing, understanding these details helps avoid common errors that could lead to enquiries or adjustments.

For tailored support, Zest R&D Tax Advisors (https://zest.tax) provides expert guidance to help optimise your claims and ensure full compliance with HMRC requirements.

FAQs

How can I make sure my RDEC claim for consumables meets HMRC requirements?

When preparing your RDEC claim, it's essential to know what counts as eligible expenditure for consumables under HMRC guidelines. Generally, consumables include items like raw materials, power, water, and fuel that are either consumed or transformed during R&D activities. On the other hand, materials that are resold or remain unchanged typically don’t qualify.

To ensure compliance, keep thorough records detailing how consumables are used in your R&D projects. This documentation will help demonstrate their relevance to your research efforts. If you're uncertain about specific cases or want to make the most of your claim while staying within the rules, seeking advice from specialists like Zest R&D Tax Advisors can be incredibly helpful.

How can I maximise my RDEC claim if my R&D project is partially grant-funded?

If your R&D project has received partial funding through a grant, you might still qualify for the Research and Development Expenditure Credit (RDEC) scheme. However, grant funding can impact how much of your spending is eligible for relief.

To make the most of your claim, it’s essential to carefully pinpoint which costs fall under the RDEC scheme and separate them from those covered by the grant. Following HMRC guidelines is crucial, as the rules around grant funding can be tricky to navigate. Getting advice from an expert can help you manage this process smoothly and maximise your claim.

How does the PAYE and NIC cap impact the RDEC credit I can claim for consumables?

The PAYE and NIC cap places a limit on the RDEC credit your company can claim, tying it to your PAYE and NIC liabilities. Essentially, the credit amount cannot surpass a set percentage of your total PAYE and NIC contributions for the relevant period.

When it comes to consumable expenses, this cap helps ensure that claims stay in line with your company’s overall tax contributions. If your claim goes beyond the cap, the surplus can often be carried forward to offset future liabilities.

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