COP9 Advice — Your Guide to Handling a COP9 Investigation
Facing a COP9 Letter from HMRC? Take Control Today.
A Code of Practice 9 (COP9) letter means HMRC suspects serious tax fraud but is offering you the opportunity to make a full disclosure and avoid criminal prosecution.
COP9 Advice — Your Guide to Handling a COP9 Investigation
Facing a COP9 Letter from HMRC? Take Control Today.
A Code of Practice 9 (COP9) letter means HMRC suspects serious tax fraud but is offering you the opportunity to make a full disclosure and avoid criminal prosecution.
What is COP9?
COP9 is HMRC’s civil procedure for investigating suspected serious tax fraud. By opting into the Contractual Disclosure Facility (CDF), you can make a complete admission in exchange for immunity from criminal prosecution (provided the disclosure is full and accurate).
This is a high-stakes situation — but with prompt, expert help, the majority of cases are resolved civilly with manageable penalties and no further action.
You have 60 days to respond. Act now.
Common COP9 Triggers
Undeclared offshore accounts or crypto assets
Significant discrepancies in tax returns
Deliberate errors or omissions
Information received from third parties
How it works
Step 1
Complete Our Quick Form (2–3 minutes)
Share brief details about your situation (COP9 letter received? Brief overview of the issue?).
Step 2
Instant Matching
We introduce you same-day to the best-matched panel specialist for your exact COP9 case.
Step 3
Free Initial Chat
Get straightforward, no-obligation advice on your options, likely penalties, and the safest nextsteps.
Step 4
Strong Defence
Your specialist handles evidence gathering, supporting documents, HMRC communication, andnegotiations — you stay in full control.
Step 5
Resolution & Relief
Most cases settle with reduced (or no) penalties — back to business without ongoing stress.
Penalties & Risks
Understanding the penalty regime is crucial. The right approach can save you thousands — or more.
Maximum Penalties
100% of tax due + interest.
With full cooperation and early disclosure: often reduced significantly to 10–40%.
Risk if incomplete or rejected: Criminal investigation and possible prosecution.
Reduced Penalties
Expert Guides & Insights from Leading Advisers
We regularly feature in-depth guides and articles written by the UK’s top COP9 and tax.
Investigation specialists — including many former HMRC inspectors.
Why Choose Specialist Help?
COP9 cases are complex and carry significant risks. Leading specialists — many former HMRC inspectors — understand the process inside out and consistently achieve the best outcomes through careful disclosure and skilled negotiation.
Reduce stress and uncertainty
Navigate the complex COP9 process with confidence, knowing you have experts by your side who understand every step.
Prepare accurate, complete disclosures
Ensure your disclosure is complete and accurate the first time, avoiding costly mistakes that could escalate to criminal proceedings.
Minimise penalties and financial exposure
Strategic disclosure and expert negotiation can significantly reduce your penalty exposure from 100% to 10-40%.
Protect your reputation and avoid escalation
Keep the matter civil and confidential, avoiding the reputational damage of criminal prosecution.
The questions we get asked most
1. What happens if I ignore a COP9 letter?
Ignoring it risks HMRC launching a criminal investigation. The 60-day window is critical — missing it removes the immunity offer.
2. Can I handle a COP9 case myself?
Technically yes, but it’s strongly not recommended. The process is complex, and incomplete disclosures can lead to criminal prosecution. Specialists achieve far better outcomes.
3. How long does a COP9 case take?
Typically 12–24 months from opt-in to final settlement, depending on complexity and cooperation.
4. What penalties can I expect?
Up to 100% of tax due for deliberate behaviour, plus interest. With full, early cooperation, penalties are often reduced to 10–40%.
5. Will a COP9 investigation affect my reputation or credit?
Handled discreetly by specialists, it usually remains confidential. No direct impact on credit rating unless unpaid settlements lead to debt issues.
6. Do I need a solicitor for COP9?
Not for most cases — tax investigation specialists handle the majority successfully. A solicitor is typically only needed if criminal prosecution risk emerges (for legal privilege and court representation).
7. What if my case involves offshore assets or crypto?
These are common COP9 triggers. Specialists experienced in international disclosures can navigate data-sharing agreements and achieve favourable settlements.
8. Can penalties be paid in instalments?
Yes — HMRC often agrees Time to Pay arrangements for genuine cases.
Latest Guides
Free plain-English articles – updated regularly
The “Corporate Veil” is Thinning: Why HMRC’s 2025 Strategy Targets Directors, Not Just Companies
By Dr. Frank, Senior Partner, LEXeFISCAL LLP If you are a business owner or director
Top 5 Mistakes to Avoid in Your COP9 Disclosure
Receiving a COP9 letter from HMRC is a serious and stressful situation. Code of Practice
Crypto Gains and COP9: What You Need to Know in 2026
Cryptocurrency has moved firmly into HMRC’s spotlight. In 2026, HMRC has significantly expanded its data-gathering
Maximising Penalty Reductions in Deliberate Behaviour Cases
When HMRC classifies behaviour as deliberate, the financial and legal consequences can be severe. Deliberate
A Few Recent Examples
“Received a COP9 letter for undeclared offshore income. I was convinced it was going criminal. They explained everything calmly, handled the disclosure, and it was settled civilly in 13 months. I slept properly for the first time in weeks after the first call.”
– Company director, North West
“HMRC opened an investigation into my property rental income. Thought I’d lose the houses. They took over, dealt with all the meetings and paperwork, and got it closed with penalties I could manage.”
– Landlord, South East
“Ignored the first letter – big mistake. Second letter threatened prosecution. They stepped in, turned it around, and it finished civil. Wish I’d called on day one.”
– E-commerce business owner
“Best decision I made was picking up the phone. They were straight with me from the start and took all the stress away.”
– Self-employed consultant