Warning signs when choosing an R&D tax adviser

Why this matters

The R&D adviser market has a quality problem, and HMRC has said so repeatedly. Compliance activity has risen sharply, nudge letter campaigns have warned entire sectors about unscrupulous advisers, and a large number of the claims now being unpicked by HMRC were prepared by firms that were very good at winning clients and very bad at defending the work.

The uncomfortable part for company directors is that this is your risk, not the adviser's. Your company signs the corporation tax return. If the claim is wrong, HMRC comes to you for the repayment of any tax credit received, plus additional interest and sometimes a penalty. The adviser will likely already have been paid and may sometimes no longer exist.

Most of this is avoidable. Poor advisers are not subtle. They give themselves away in how they sell, the way they approach the claim preparation and what they say when you ask about enquiries. The warning signs below are grouped by where you will actually encounter them, starting with the ones you can check before you speak to anyone.

The strongest warning sign of all

If an adviser cannot clearly explain how your claim would stand up to HMRC scrutiny, stop there. Nothing else on this page outranks it.

The quality of an R&D adviser is not tested at submission. It is tested a year or more later, when a compliance check arrives, and someone has to explain, in writing, against a deadline, why the work met the statutory definition of R&D. An adviser who talks fluently about benefit and vaguely about defence has told you which part of the job they are built for.

Ask the question directly and early: if HMRC opens an enquiry into this claim, what happens? A serious adviser has a rehearsed answer, because they have done it before. A less scrupulous adviser will change the subject to timescales and rebate values.

Warning signs you can check before you speak to anyone

Most claimants start choosing an adviser with a conversation. Start with the public record instead, because it is free, it is not curated by the adviser's marketing team, and it filters your shortlist before anyone has a chance to charm you.

The firm files its own accounts or confirmation statements late

This is a small thing that tells you a lot. A firm whose entire commercial pitch is that it can be trusted with your statutory filings and your evidence trail, but which cannot file its own confirmation statement on time, has a discipline problem. Lateness of claim notification or filing could cost you your entire R&D tax claim.

Repeated lateness by an adviser with their own statutory deadlines is a signal worth noting.

The firm is very newly incorporated

For this purpose, we take new to mean where the legal entity has existed for two years or less. You can filter advisers by age on the platform, because some users prefer to look at advisers with a more established trading history. But new on its own is not a red flag. Some very good advisers will fall into this category and experienced advisers leave established firms and set up on their own all the time. The warning sign is newness combined with something else, such as no identifiable R&D, tax or relevant scientific or technological experience, or a firm engaging in aggressive volume marketing almost from the outset.

Look closely at the directors' history, though. Occasionally a bad firm folds, only for substantially the same business to re-emerge, phoenix-like, a few months later with a new Companies House record. A newly incorporated firm deserves closer scrutiny where the same people were previously involved with another R&D adviser that ceased trading after serious complaints, professional body disciplinary action, HMRC action or insolvency.

A firm incorporated six months ago and persistently calling or pressuring businesses to claim after they have said no is a different proposition from one set up recently by named advisers with a long and respectable track record in R&D tax.

In most cases, the age of the company matters less than the experience and history of the people behind it.

Nobody at the firm belongs to a professional body

Professional body membership is not an absolute guarantee of quality, but it can sometimes give you more reassurance and recourse if things go wrong.

Currently, anyone can call themselves an R&D tax specialist. There is no licence and no R&D sector-specific regulation. Where an adviser is a member of a body such as the CIOT, the ATT, ACCA or ICAEW, they are personally bound by Professional Conduct in Relation to Taxation (PCRT), which requires them to take on only work they are competent to do. That obligation sits with the individual member, so it is worth checking who at the firm actually holds the qualification and whether they will be handling your claim. Check that the qualified individuals are still there too, as websites are not always updated when someone leaves. Members in practice must also keep their knowledge up to date through continuing professional development, and can be disciplined if they do not.

Some firms go further and display a professional body logo, for example the CIOT or ACCA firm logo. A firm is only permitted to do this if it has applied to the body and meets its criteria for firm-level recognition, such as a minimum proportion of principals holding the relevant qualification. Firms recognised in this way are usually supervised by that body for Anti-Money Laundering purposes too, rather than by HMRC, which brings a further layer of oversight. Member firms must also hold professional indemnity insurance, though you should still expect this from non-member firms. We show firm level membership on profiles where we have been able to verify it.

Of course, like most things in life, there are exceptions. Even professional body members have been criticised for poor practice in the past, and there are reports that complaints to some bodies have not always been acted on as quickly as they might. A tax qualification shows general competence, but R&D is a specialist area that is only touched on in some tax training, so a qualified adviser who has not kept up with changes in the regime can still get things wrong. However, a firm where nobody belongs to a professional body has no mandatory PCRT obligations, no professional body supervision and no complaints route beyond the courts. It may be very good at what it does. You just have a little less recourse if it isn't.

The named "ex-HMRC people" cannot be found

"Ex-HMRC inspectors on the team" is one of the most common claims in this market and one of the least verified. Ask for names and roles. If the firm will not name them, or the names cannot be verified, treat the claim as marketing. A genuine former inspector is an asset the firm should be happy to put a name to, if not on their website, then at least in conversation, if they will genuinely be working on your claim.

Even where the person is real, check what they actually did. "Inspector" is a term often used loosely. HMRC has tens of thousands of staff and most of them have never worked a compliance case, let alone an R&D one, and most sit at grades below inspector level. Someone who spent a few years as an Administrative Officer on a helpline is ex-HMRC, but that is not the same as an inspector who ran R&D enquiries. Ask what grade they held, which team they were in and whether they dealt with R&D claims and enquiries from the HMRC side. A quick check on LinkedIn will usually tell you whether the answers hold up.

There is no evidence of tax trained staff

R&D relief is tax legislation before it is anything else. A firm with a sales team and a writing team, but no identifiable tax capability, risks producing a good narrative without the depth of tax analysis behind it. That shows in areas like s1308 CTA 2009 and the consequential intangible fixed asset adjustments, or where you want to surrender R&D enhanced losses under the intensive scheme as group relief or carry them back to a previous year under s37 CTA 2010. These are areas complex enough to catch out even experienced tax professionals, let alone a firm without any.

There is no scientific or technological capability at the adviser's disposal

Your claim depends on technological uncertainty and a technological advance, judged against what a competent professional in the field already knows. If nobody at the adviser can hold a technical conversation with your engineers or scientists, the narrative will be written by someone paraphrasing a questionnaire. That reads exactly as it sounds when HMRC opens it.

Ask whether they have knowledge of your specialism, or access to someone who does. Many advisers can handle claims in the more established areas of software and engineering, so this matters most where your advance is in a niche area of science or technology or at the edge of the field. The adviser's specialist does not necessarily need to be in-house, since no firm can justify employing a nuclear scientist for one claim every ten years, but it does need to exist and be accessible, and they should be able to tell you who it is.

There is adverse media coverage

Search the firm's name alongside terms such as HMRC, enquiry, investigation, complaints, insolvency and refund. R&D has been covered heavily by the trade and national press over the last five years, and a firm with a history of clients being left to face enquiries alone, or that has been the subject of specific HMRC action, tends to leave a trail.

Check independent review sites too, not just the testimonials on the firm's own site. Trustpilot and Google Reviews will tell you what clients think. Glassdoor will tell you what the staff think, which is often more revealing. Repeated reports of poor communication, unsupported claims, unexpected fees or clients being left to manage an HMRC enquiry deserve closer scrutiny, as do former employees describing aggressive sales environments or being asked to push claims they were not comfortable with. A firm that has been trading for years without leaving a messy footprint behind is probably a good starting point.

We do this for every adviser as part of our media and public records check. It covers press and sector commentary, HMRC publications, tribunal records, insolvency records, review platforms and professional body disciplinary records. The result feeds into a simple RAG rating on each adviser profile. A green rating does not guarantee there are no issues, only that we found no material adverse indicators when we looked. As with any due diligence, it is a snapshot based on the information considered at the time, and new information can emerge.

The firm is not registered with the ICO

ICO registration is a legal requirement for most businesses that process personal data, unless an exemption applies, and it costs very little. An R&D adviser is likely to be given personal information about at least some of your people, so data protection should be a basic part of how the firm operates. If you cannot find a reference to the firm on the ICO register, that does not necessarily mean it is unregistered. It may be registered under a previous name, a trading name or another legal entity within the group. Treat the absence as a question to ask. The adviser should be able to show how it is registered, explain which legal entity the registration covers and, if that differs from the entity you are dealing with, explain how the registration covers the processing of your data.

If they are not registered, they should be able to explain why registration is not considered necessary.

Where there is no satisfactory explanation, or a vague response about not yet getting round to this, that raises a legitimate question about the firm's approach to data protection and wider compliance.

Warning signs in how an adviser sells

Generic outreach

Blanket emails, initial calls suggesting a claim benefit figure before discussing a project and mass marketing suggesting that most businesses can claim are rarely good signs. A firm that can put a figure on your claim before understanding your work is selling rather than advising.

Money-first, project-second language

Slogans about free money, government cash, money on the table and money you are owed. R&D relief is not owed to anyone. It is available to companies that have carried out qualifying activity and can evidence it.

Watch for 'claim maximisation' as the headline offer. Maximising a claim is easy. Anyone can add cost categories and inflate a number. The hard part is making sure what goes in is accurate, justifiable and would survive a compliance check. The right claim is not the largest one you can submit, it is the largest one you can defend within the rules.

A yes on the first call

The most useful thing a specialist will ever do for you is tell you that you do not have a claim, or that the claim is smaller than you hoped. A volume firm cannot always afford to say this, because its economics depend on throughput. Treat an unqualified yes before any technical discussion, or an assumption that you definitely qualify because "in their experience nearly every company undertakes research and development in some form or another", as a warning rather than a welcome sign.

Claims of HMRC approval or endorsement

HMRC does not approve, accredit or endorse any individual R&D tax advisers. Any firm implying otherwise is either confused about the rules or comfortable misleading you, and neither is a good start.

A high claim promised with no involvement from you

Some advisers sell the absence of effort: we will handle everything; we barely need your team. R&D claims require the competent professional to substantiate the technical position. If your engineers and scientists are not involved, someone else is inventing the technical narrative that carries your name.

Warning signs in how an adviser works

Generic questionnaires and no real technical discussion

A form emailed over or filled in online, completed by your finance manager, and then a report appears. No site visit, no call with the people who did the work, no interrogation of what was actually uncertain. This is often the hallmark of a claim mill. When it comes to preparing an R&D claim, less effort is not more.

You do not see the report before it is submitted

You are approving a statement to HMRC about your own company. Any adviser who submits without your review and sign-off has misunderstood whose liability this is.

Warning signs around fee structure

The specific things to watch:

• Percentage fees are common and not a warning sign on their own. The question is what stops the fee incentive from becoming an overclaim, particularly where a sales team is on commission. Ask what happens to any commission paid to the person who sold you the claim if it is rejected a year or two later and they have since left the adviser. If the answer is nothing, the person who sold you the claim had every incentive to oversell it and no exposure to being wrong.
• Ask whether the firm refunds its fee, in full, if your claim is rejected by HMRC.
• Multi-year lock-ins and automatic renewal clauses.
• Enquiry defence excluded from the fee.

Warning signs around governance, insurance and data

You are about to hand a third party your financial records, your project documentation and, in some cases, your source code or lab notes. Reasonable checks:

• Data protection. Ask how your data is stored, who has access, whether any of it is processed outside the UK and whether client or employee information is entered into AI tools. Using AI is not inherently a problem, but the processing should be transparent and reflected appropriately in the firm's privacy information. GDPR obligations do not pause because the work is technical.
• Cyber Essentials, ISO 9001 and ISO 27001 certification provide further reassurance about data protection, quality and security. Absence is not disqualifying, particularly for a small firm where certification cost is real. Presence is externally verified evidence that someone has audited the way they work, rather than the firm marking its own homework. Treat these as positive signals rather than minimum standards.
• Professional indemnity insurance. Confirm it exists and confirm the cover level is proportionate to the claims they prepare. A firm submitting six-figure claims on a minimal policy is arguably not insured in a meaningful sense.

Warning signs around enquiry handling

This deserves its own heading because it is the clearest dividing line in the market. The things to watch:

• Enquiry support is not offered at all, or the firm cannot clearly explain who would handle it. Defence does not have to be in-house. It can be outsourced, bought in or provided through an insurance-backed arrangement. What matters is that you know who would defend the claim, what is included and what it would cost.
• Defence is charged separately or by the hour, on top of a contingent fee for preparation. That is not necessarily wrong, but it should be clear before you sign. If the preparation fee does not include the cost of defending the claim later, it is reasonable to expect the fee to reflect that.
• Nobody at the firm has ever handled an enquiry, from either side. Your compliance check should not be their first.
• A quoted low enquiry rate with no methodology behind it. Almost nobody says how the percentage is calculated. A firm counting enquiries against every claim it has ever submitted will show a much lower rate than a newer firm, because HMRC opened very few until a few years ago, and any claim submitted in the last twelve months is still inside the enquiry window and may not yet count. A low figure, or one that beats the competition, means nothing without the period, the denominator and whether claims still open to enquiry are included. Zero is not a boast either. It usually means a small sample, a new firm or an answer not being given straight.
• The engagement ends at submission.

For anything you want to ask rather than check, see the questions guide.

Doing the desk check yourself

Every public record signal on this page is checkable. Companies House gives you the incorporation date, filing history and officers. The professional bodies' member directories tell you whether an individual is a member. The ICO register is public. A search engine gives you the adverse media.

Adviser Radar pulls those signals together for R&D advisers in one place, so you can filter by sector, check filing history and professional body membership and see our Radar Assessment before you make contact. Advisers cannot buy a better Radar Assessment, and the assessment is generated from the public record rather than from marketing.

A check takes ten minutes. The enquiry it saves could take eighteen months.

The best single rule

Judge an R&D adviser by how well they could defend your claim, not by how easily they can submit it. Everything on this page is a proxy for that one question. If you only have time for one test, make it that one.