Where manufacturing claims are genuinely strong
The sector’s qualifying pattern is process-and-materials capability: making something the field could not previously make, at a tolerance, throughput, temperature or material combination beyond established practice, where competent engineers could not readily deduce the route. HMRC’s examples oblige with specifics. The production-plant case fails on general know-how, but qualifies the sub-project developing new packaging tooling through development work and trials. The shelf-life case qualifies formulation work against a real technical constraint. The caravan-fireproofing case qualifies the advance-seeking work from the point the uncertainty was identified.
That last clause is the sector’s discipline. HMRC’s examples repeatedly start the qualifying window at the identified uncertainty and stop it at resolution. In the chemical trials example that means day 12 of 20, with the rest expressly non-qualifying.
Where they overreach
- Efficiency as R&D. Lean programmes, waste reduction and line rebalancing are valuable. In HMRC’s production-plant example they are also, expressly, not a qualifying project without a specifically identified technological goal.
- Routine tooling and installation. Commissioning known equipment, however disruptive, is adoption. The qualifying version is the packaging-tool pattern: development and trials against a real capability gap.
- Continuous improvement dressed as projects. The guidelines demand a project seeking an advance; a year of accumulated tweaks reconstructed at claim time is neither planned nor bounded, and reads that way.
- The whole-factory apportionment. Operators, maintenance and quality staff qualify only for time directly contributing to the R&D or genuine qualifying indirect activities, evidenced person by person: staff costs.
The consumables and power rules, which bite here hardest
Manufacturing is where the consumables category earns its complexity. Materials transformed or used up in the R&D qualify. So do water, fuel and power, apportioned to the R&D use, and in energy-intensive trials that is real money. The counterweight is statutory: where items produced in the R&D are sold or transferred in the ordinary course of business, the consumables that went into them are excluded. First production runs sold to customers are the classic overreach. The category detail is on qualifying costs.
- HMRC, GfC3 Part 4 (how to identify qualifying R&D activities, with manufacturing examples), gov.uk
- DSIT, Meaning of research and development for tax purposes: guidelines (2023), gov.uk
- HMRC, CIRD136000 (consumable items, including the sold-products rule), Corporate Intangibles Research and Development Manual, gov.uk
Frequently asked questions
Does improving our production efficiency qualify?
Not as a business goal. HMRC's production-plant example rejects general efficiency know-how because it was not a project seeking a specifically identified technological advance, while the specific tooling sub-project inside the same plant qualified. The pattern: name the technological problem, or there is no claim.
Do prototypes qualify?
Building and testing prototypes inside the uncertainty window can qualify. But the guidelines end R&D at a prototype with the final functional characteristics, and the consumables rule excludes materials in items you go on to sell. A "prototype" sold to a customer is a product, twice over.
We tweak recipes and formulations constantly. R&D?
HMRC's dessert examples split exactly this: extending shelf-life against a real technical constraint qualified; iterating a recipe for flavour, a non-technological outcome, did not. Formulation work qualifies when the uncertainty is scientific, not sensory or commercial.
Does scale-up from lab to plant qualify?
Only while genuine uncertainty remains. In HMRC's chemical-manufacturing example the uncertainty resolves on day 12 of a 20-day trial programme and the remaining fine-tuning does not qualify. Scale-up claims live and die on where that day falls, evidenced.