R&D tax relief, prepared to withstand HMRC scrutiny

We prepare claims under the merged R&D scheme and ERIS, and we defend them if HMRC asks questions. R&D tax relief is all we do.

HMRC now checks around 17% of R&D claims. Ours are prepared by a regulated chartered practice, with enquiry support included as standard.

Gross credit on qualifying spend under the merged scheme: £15,000 net at the 25% CT rate, or £16,200 at 19%, on £100,000 of spend

0%

Payable credit on £100,000 of qualifying spend for a loss-making, R&D-intensive SME claiming ERIS

£0

R&D claims HMRC now checks, which is why every engagement includes enquiry support

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Why companies trust us with their claims

Because we are accountable in ways many R&D agents are not. The mis-selling era left companies facing enquiries their advisers would not defend. Our answer is a regulated, chartered practice.

Chartered on both fronts

A member firm of both the Chartered Institute of Taxation (CIOT) and ICAEW, led by a dual-qualified founder, with every claim signed off by a chartered adviser.

Regulated by ICAEW

Including anti-money-laundering supervision, with a published complaints route.

Bound by PCRT

Professional Conduct in Relation to Taxation governs every position we take.

Registered with HMRC

Registered with HMRC as a tax adviser, and named on every claim we prepare.

Enquiry support included

In every engagement as standard. If HMRC opens a compliance check, we handle the response.

We stand behind our work

We prepare the right claim, defensibly. Read about our regulation and standards.

Who we work with

Companies whose business is their R&D. Sector by sector, claims trip up in different places — each card names the complication we solve most often.

How it works

Your fee is agreed before work starts, with no hidden costs. If we do not think you qualify, we say so.

See the full process

01

Scoping call

A conversation about your work and your numbers. You get a straight view on eligibility, and if we do not think you qualify, we say so.

02

Technical and financial workstreams

We interview your competent professionals, define the project boundaries and build the qualifying cost schedules.

03

Report and return

We prepare the technical report, the Additional Information Form and the corporation tax return entries; as HMRC-registered tax agents we do not hand the filing to anyone else.

04

Submission and aftercare

We submit, track progress with HMRC and provide enquiry support as part of the engagement. If useful, we help you put R&D record-keeping in place for the next claim.

Our clients’ words

Hear from the R&D-performing companies we act for. More client feedback is on our testimonials page.

S

Sandy

Jellagen Limited

“We’ve worked with LimestoneGrey for several years and their professionalism, speed and clear approach make them a pleasure to work with. They quickly understand the complexities of our R&D and ensure the claims process is straightforward, fair and accurate.”

V

Dr Varghese

Laennec AI Limited

“Working with LimestoneGrey has been a genuinely positive experience. Their communication is clear and proactive and they are always on hand to answer queries and provide reassurance throughout the process. We have complete trust in their expertise and feel confident that our claims are being handled professionally.”

M

Marcus

Neurabotics Limited

“We have been very happy with the service provided by LimestoneGrey. In particular, their attention to detail has been exceptional, making the entire process smooth and reassuring for us.”

Recognition

Finalist, One Nucleus Awards 2026: Most Innovative Professional Services Company

Finalist, Finance Awards Wales 2026: Independent Practice of the Year

Business Wales Accelerated Growth Programme Gold Partner

Memberships and associations

We are members of, and work alongside, the innovation and life-sciences networks our clients operate in, across the UK.

Latest thinking

Technical analysis and firm news from the team, written by the advisers who prepare the claims.

View all insights

Talk it through with a chartered adviser

A first conversation costs nothing and commits you to nothing. You will speak to a qualified adviser, not a salesperson.



Request a scoping call