Code of Practice 9 (COP9) / Contractual Disclosure Facility
used for suspected serious tax fraud. This is the highest‑stakes type of investigation, and the wrong move can risk criminal prosecution.
Specialist Tax Advisers
HMRC Tax Investigation Support
Facing an HMRC tax investigation? Pearl Lemon Tax manages your case end-to-end — COP9, COP8, VAT & self-assessment enquiries. Reduce penalties. Book a…
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HMRC Tax Investigation Support: Specialist Defence When HMRC Comes Knocking
Receiving an HMRC investigation letter, whether it is under Code of Practice 9 (COP9), COP8, a Section 9A enquiry, or a “nudge” letter, can be alarming. The wrong response within the first 14 days can turn a routine compliance check into a full civil fraud investigation with penalties of up to 100 percent of the tax owed.
At Pearl Lemon Tax, we act as your authorised agent. We take control of all correspondence with HMRC, manage the disclosure process, and work to keep penalties, interest, and the scope of the enquiry as limited as possible.
Whether you are a contractor facing an IR35 review, a company under a Corporation Tax enquiry, or an individual managing an offshore disclosure, we have the experience to handle it.
You do not speak to HMRC — we do.
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Types of HMRC Investigation We Handle
Code of Practice 8 (COP8)
used for complex avoidance and high‑value enquiries where fraud is not currently suspected.
Self‑Assessment (Section 9A) enquiries
carried out as aspect or full reviews of personal tax returns.
Corporation Tax enquiries
include both full and aspect investigations into company tax positions.
VAT investigations and inspections
involve officer visits, compliance checks, and formal assessments.
IR35 / off‑payroll status reviews
cover both contractors and the businesses that engage them.
Offshore income and assets
managed through disclosures under the Worldwide Disclosure Facility (WDF) and data obtained through the Common Reporting Standard (CRS).
“Nudge” and prompt letters
early‑stage letters from HMRC that should never be ignored.Not sure which type of letter you have received? Send us the letter reference, and we will tell you exactly what it means, free of charge, within one business day.
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Our HMRC Tax Investigation Support Services
Our services are designed to guide you through each stage of an HMRC investigation. With our skills in managing complex tax issues, we offer the following services:
HMRC Enquiry Case Management & Agent Representation
When HMRC opens an investigation, it is essential to have experienced professionals managing the process. We take over the case management, ensuring all communication with HMRC is handled accurately and promptly. Our team will prepare all necessary documentation, respond to HMRC’s queries, and ensure deadlines are met without any issues. We will act as your intermediary, protecting your interests and reducing the strain of dealing directly with HMRC. Whether you are facing a full audit or a targeted investigation, we ensure that your case is handled strategically. In a recent self‑assessment enquiry, taking over correspondence within the 30‑day window allowed us to reframe the disclosure and reduce the proposed penalty from 70 percent to 20 percent of the tax due. (Results may vary by case.)
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Penalty Negotiation & Tax Dispute Resolution
Tax investigations can result in disputes over unpaid taxes or penalties. We offer specialist negotiation services to help resolve any issues that arise from an investigation. Our team is skilled in presenting your case to HMRC in the most favourable light, often resulting in reduced penalties or more manageable repayment terms. By handling negotiations, our tax dispute resolution service help you avoid prolonged disputes and offer solutions to minimise your financial liability. We ensure that all negotiations are conducted professionally and efficiently, resulting in favourable outcomes whenever possible.
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Representation in Tribunal Hearings
If your case progresses to a tribunal, you will need strong representation that understands tax law and tribunal procedures. We have the experience needed to represent you effectively, ensuring your case is heard fairly and your interests are fully represented. Our skills in tribunal hearings increase your chances of achieving a favourable resolution. We take care of all the paperwork, presentation, and legal processes, so you can focus on your business.
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Tax Return and Filing Support
If an investigation stems from discrepancies in your tax returns, our team will assist you in reviewing and rectifying your filings. We provide specialist advice on any necessary corrections and ensure that your future filings are accurate and in line with HMRC regulations. Correcting errors immediately and efficiently can prevent further complications down the line. We also guide you on how to prevent future issues with HMRC, ensuring your business stays compliant.
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Investigation Strategy and Advice
Even before an investigation begins, we help you with planning and strategies to manage potential risks. Our team works with you to understand your tax situation and develop a strategy that minimises the chances of future investigations. We guide you on structuring your finances and filings in a way that complies with HMRC requirements. Our proactive strategies are designed to give you peace of mind while keeping your business operations running smoothly.
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Tax Liability Analysis and Advice
If your case involves significant tax liabilities, we offer a thorough analysis of your financial situation to identify areas where adjustments can be made. Our team helps you understand how your current tax position can be managed and provides solutions for reducing the potential impact. We also help with understanding your rights regarding tax reliefs or allowances that could reduce the amount owed. This service ensures that you are fully aware of your tax obligations and your options for handling any liabilities.
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Legal and Tax Specialist Witness Support
In some cases, our testimony is necessary to support your case in court or tribunal hearings. We provide legal and tax specialist witness services to ensure that your case is backed by solid evidence and professional insights. Our testimony is based on a thorough understanding of tax law and real-world applications. We prepare detailed reports and provide specialist opinions that strengthen your case, ensuring the best possible outcome for you.
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Voluntary Disclosure & COP9/CDF Support
If you believe there are discrepancies in your past tax filings, we can assist with making a voluntary disclosure to HMRC. This proactive approach can significantly reduce penalties and demonstrate your willingness to cooperate. We guide you through the voluntary disclosure process, helping you avoid full investigations and keeping potential penalties to a minimum. By working with us, you can ensure that any discrepancies are addressed promptly, with minimal disruption to your business. Schedule a consultation with us today.
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How We Handle Your HMRC Investigation: A 4-Step Process
Same‑Day Triage
You forward the HMRC letter. We identify the type of enquiry, the deadline, and the risk level, then schedule a confidential call.
We Become Your Authorised Agent
We file a Form 64‑8, take over all contact with HMRC, and pause the need for you to respond directly.
Strategy and Disclosure
We review your records, prepare the disclosure or defence, and present your position to HMRC in the strongest possible light.
Resolution and Protection
We negotiate the final settlement, minimise penalties, and implement safeguards to prevent future issues.
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Why Clients Trust Pearl Lemon Tax with an HMRC Investigation
- Specialist, not generalist. We handle HMRC enquiries every day, including COP9 and COP8 cases that many high‑street accountants refer elsewhere.
- Ex‑HMRC insight. Our team includes former HMRC professionals who understand how cases are built and prioritised, allowing us to anticipate the next step.
- We protect your position. As your authorised agent, all contact goes through us, reducing the risk of saying anything that could harm your case.
- Penalty‑mitigation focus. Our objective is not only to respond, but to reduce the tax, interest, penalties, and overall scope of the enquiry.
- Fixed‑fee transparency. You will always know the cost of representation before any work begins.
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HMRC Tax Investigation Defence Success Stories
London Contractor – COP9 Voluntary Disclosure With Penalty Reduction
Client: IT contractor under a Code of Practice 9 (COP9) enquiry for offshore income non-disclosureChallenge: HMRC issued a COP9 letter requesting a Contractual Disclosure Facility (CDF) statement within 60 days. Incorrect self-filing risked escalated penalties and potential criminal referral.
Solution: Pearl Lemon Tax took over representation within 10 days, secured an extension, prepared a full forensic disclosure, and negotiated penalty classifications under the voluntary-disclosure framework.
Result: Penalties reduced from 70 percent to 18 percent, no criminal referral made, and HMRC confirmed case closure with full cooperation credit.
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Manchester Ltd Company – Corporation Tax Enquiry And Reclassification Of Expenses
Client: SME trading company subject to a full corporation tax enquiryChallenge: HMRC questioned £180,000 of director expense claims and R&D credits, considering them excessive and unsubstantiated, leading to a draft penalty at 50 percent of tax due.
Solution: Our tax investigation team rebuilt expense records, corrected statutory accounts, submitted contemporaneous R&D documentation, and represented the client through two HMRC meetings.
Result: HMRC accepted 87 percent of the disputed items, penalties cancelled entirely, and company reputation maintained through a compliant disclosure report.
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High-Net-Worth Individual – Offshore Account Disclosure Under Worldwide Disclosure Facility
Client: UK-based investor with undeclared overseas dividends identified via Common Reporting Standard dataChallenge: HMRC issued a "nudge" letter inviting voluntary disclosure, with potential penalties up to 200 percent for offshore assets considered deliberate concealment.
Solution: Pearl Lemon Tax submitted a formal Worldwide Disclosure Facility application, quantified foreign income across six jurisdictions, and structured the settlement using legitimate foreign tax credit reliefs.
Result: 80 percent penalty reduction achieved, repayment structured over 12 months, and no referral to COP8 or COP9. HMRC confirmed full case closure 2026.
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What Our Clients Say
Lisa Gordon
When I received my COP9 letter, I panicked. Pearl Lemon Tax explained every step, handled HMRC directly, and reduced penalties drastically. Their calm, experienced approach made a very stressful situation bearable.
Craig Ellis
Our limited company faced a full corporation tax enquiry, and Pearl Lemon Tax stepped in immediately. They rewrote the narrative with HMRC and turned what could have been a £60k problem into a modest adjustment with no penalties.
Ravi Sharma
The team guided me through the Worldwide Disclosure Facility process perfectly. I never once had to speak to HMRC myself, and the outcome was far better than expected. Their knowledge of penalty mitigation is extraordinary.
Got Questions?
Frequently Asked Questions
Straight answers to common questions about this tax service.
Start Taking Control of Your Tax Investigation
We are here to guide you through the complexities of HMRC tax investigations. We know the intricacies of tax law and are committed to ensuring that your case is handled with the skills it deserves.
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