What Qualifies As Consumable Items In An R&D Tax Credit Claim For A Biotech Startup?

If your biotech startup spends thousands on reagents, antibodies, cell culture media, or plasticware, you need to know which of those costs qualify as consumable items in an R&D tax credit claim. The rules are specific. HMRC does not accept a blanket "all lab supplies" approach.

This article covers what counts as a consumable item for R&D relief, what does not, and how to structure your claim to avoid an enquiry.

What HMRC means by consumable items in R&D

For corporation tax purposes, consumable items are materials that are used up or transformed during the research and development process. They are not capital assets. They do not have a useful life beyond the project they support.

The relevant legislation is in the Corporation Tax Act 2009, Part 13. It allows relief for "consumable or transformable materials" used directly in R&D. HMRC's internal manual (CIRD81900) gives the detailed interpretation.

For a biotech startup, this covers the day-to-day supplies that go into experiments. The key test is direct use. If the item is consumed in the R&D activity itself, it qualifies. If it is used for general lab operations, quality control, or production, it does not.

Biotech consumables that typically qualify

Most biotech R&D involves wet-lab work. The consumables list is long, but the principle is consistent. The item must be used up or chemically altered during the research.

Reagents and chemicals

Enzymes, buffers, solvents, staining agents, and assay kits all qualify when used in experiments. If you buy a restriction enzyme to cut DNA during a gene-editing project, that cost is allowable. If you buy the same enzyme to run a routine QC test on a production batch, it is not.

The distinction is project-specific. A biotech startup developing a new CRISPR-based therapy can claim the cost of guide RNAs, Cas9 protein, and transfection reagents used in the R&D phase. Once the therapy moves into manufacturing, those same items become production costs.

Cell culture materials

Growth media, foetal bovine serum, antibiotics, and supplements used to maintain cell lines during R&D qualify. So do the flasks, plates, and bioreactor bags that hold the cultures.

One common mistake is claiming the full cost of a cell line itself. If you purchase a commercially available cell line (e.g. HEK293T from ATCC), that is typically a capital asset, not a consumable. But the media and plastics used to grow it during R&D are consumable.

Antibodies and proteins

Primary and secondary antibodies used in western blots, ELISA, or immunohistochemistry qualify. Recombinant proteins used as controls or standards also qualify, provided they are consumed in the experiment.

If you produce your own antibodies in-house, the costs of the hybridoma media, purification columns, and buffers count as consumables. The labour to produce them does not, but the materials do.

Plasticware and disposables

Pipette tips, microcentrifuge tubes, PCR plates, petri dishes, and serological pipettes all qualify when used in R&D. These are single-use items consumed directly in experiments.

The trap here is claiming general lab consumables that are not linked to a specific R&D project. HMRC expects a clear connection. If you order a box of pipette tips that are used across multiple projects, you need to apportion the cost.

Custom synthesis and sequencing

If you commission a third party to synthesise a custom oligonucleotide, peptide, or gene fragment for use in your R&D, the cost is a consumable. The same applies to Sanger sequencing or next-generation sequencing runs that generate data for your research.

These costs are often significant for a biotech startup. A single NGS run can cost £1,000 to £3,000. If the data feeds directly into your R&D, it qualifies.

What does not qualify as a consumable item

HMRC draws a clear line between R&D consumables and general lab overheads. The following items do not qualify, even if they are essential to running the lab.

• Lab equipment. Centrifuges, microscopes, plate readers, thermal cyclers, and fridges are capital items. They attract capital allowances, not R&D relief on the purchase cost. However, the consumables used in that equipment (e.g. PCR tubes, assay plates) do qualify.
• Office supplies. Printer paper, pens, notebooks, and general stationery are not R&D consumables. Even if the notes record experimental data, the stationery itself does not qualify.
• Software subscriptions. Bioinformatics software, lab management systems, and data analysis tools are not consumable items. They may qualify as externally provided workers or software costs under a different category, but not as consumables.
• Routine quality control. If you run the same assay every week to check product stability, that is QC, not R&D. The consumables used in those tests do not qualify.
• Production-scale materials. Once you move from pilot batches to commercial production, the consumables used in manufacturing are not R&D. The transition point is often debated with HMRC. Keep clear records of when R&D ends and production begins.

How to calculate the consumable costs for your claim

The calculation is straightforward in principle but requires good record-keeping. You need to identify which consumables were used in qualifying R&D projects and what proportion of each item was consumed in those projects.

For a biotech startup running multiple experiments, a time-based or project-based apportionment is common. If you use 60% of a reagent in R&D and 40% in non-R&D work, you claim 60% of the cost.

HMRC accepts reasonable apportionment methods. The key is to document the basis. If you are audited, you need to show how you arrived at the figure. A spreadsheet that tracks consumable usage by project is the minimum standard.

For the merged R&D tax relief scheme (accounting periods starting on or after 1 April 2024), consumable costs are included in the qualifying expenditure for both the RDEC and the enhanced R&D intensive scheme (ERIS). The calculation method is the same as before, but the rates differ.

Under RDEC, you get a 20% tax credit on qualifying expenditure (including consumables). Under ERIS, loss-making SMEs with intensive R&D (30% or more of total spend on R&D) can surrender losses for a cash credit at up to 27%.

Common pitfalls for biotech startups

Biotech startups often make the same mistakes on consumable items. Here are the ones we see most frequently.

Claiming the full cost of a consumable used across multiple projects

If you buy a bulk pack of pipette tips and use them across three R&D projects and one non-R&D project, you cannot claim the full cost. Apportion it. HMRC will look for a reasonable split.

Including VAT when the company is VAT registered

If your biotech startup is VAT registered and can recover the VAT on consumables, the claim should be based on the net cost. Including irrecoverable VAT is only correct if you cannot reclaim it.

Confusing consumables with capital equipment

Buying a £5,000 plate reader is not a consumable. It is a capital asset. Claim capital allowances instead. But the plates and reagents used in that reader during R&D are consumable items.

Not keeping purchase invoices

HMRC can ask to see evidence of the costs. Keep all supplier invoices, delivery notes, and internal records that link the consumable to the R&D project. Digital copies are fine.

Real example: a Manchester biotech startup's claim

A client of ours runs a biotech startup in Manchester's Corridor district, developing a novel cell therapy for autoimmune disease. In their first year, they spent £63,400 on consumables. We helped them identify £47,200 of qualifying costs.

The qualifying items included cell culture media (£8,400), custom antibodies (£12,600), PCR reagents and plasticware (£6,200), and third-party sequencing (£4,800). The remaining £15,200 was non-qualifying: general lab gloves, cleaning supplies, and equipment maintenance contracts.

The £47,200 was included in their RDEC claim, generating a net tax credit of £9,440 after corporation tax offset. Without proper categorisation, they would have claimed the full £63,400 and risked an enquiry.

Record-keeping for consumable items

If you want to claim consumable items in your R&D tax credit claim, you need records that satisfy HMRC. The minimum is:

• Purchase invoices for each consumable item, showing the date, supplier, description, and cost.
• A log linking each consumable to a specific R&D project or a clear apportionment methodology.
• Project records (lab notebooks, experiment protocols, meeting notes) that demonstrate the R&D activity.
• A summary spreadsheet showing total consumable spend, the qualifying portion, and the basis of apportionment.

Many biotech startups use lab management software like Labguru, Quartzy, or Benchling to track consumable usage. That data can be exported and used to support the claim. If you use a manual system, a simple Excel workbook updated weekly is sufficient.

How an ICAEW-qualified accountant helps

R&D tax credit claims are technical. The rules on consumable items are specific, and HMRC is increasingly focused on the quality of claims. A poorly prepared claim can trigger an enquiry that delays the credit by months.

As ICAEW-qualified accountants, we work with biotech startups to structure their claims correctly from the start. We review the consumable list, identify non-qualifying items, and prepare the supporting documentation. We also handle the technical report that explains the R&D projects to HMRC.

If your biotech startup is spending significant sums on lab consumables, it is worth getting the claim right. The relief can be substantial. A typical early-stage biotech company can recover 20% to 27% of qualifying R&D spend as a cash credit or reduced corporation tax.

For more detail on how R&D tax credits work for limited companies, see our R&D tax credits page. If you are considering incorporating your biotech startup, our incorporation guide covers the structure decisions that affect your R&D claim.

Final thought

Consumable items are one of the largest categories of qualifying expenditure for biotech startups. Getting the classification right is not optional. HMRC will check. But with proper records and a clear understanding of the rules, you can claim the relief you are entitled to without triggering an enquiry.

If you are unsure whether a specific cost qualifies, ask. It is better to exclude a borderline item than to include it and face a challenge. And if you want a second opinion on an existing claim, get in touch. We review claims regularly and often find missed costs or overclaimed items.