Facing a Serious HMRC Tax Inquiry in London? What You Need to Know About Code of Practice 9 (COP9)
Receiving a formal letter from HMRC Fraud Investigation Service (FIS) is enough to turn any business owner’s world upside down. When HMRC suspects deliberate tax evasion or serious irregularities, they don’t issue standard compliance queries but a Code of Practice 9 (COP9) notice.
If you are facing this situation, navigating an HMRC tax disclosure in London under COP9 requires immediate specialist intervention to protect your livelihood, assets, and reputation.
Here is what COP9 actually involves, how the process works, and how you can resolve it safely.
What Exactly Is Code of Practice 9 (COP9)?
COP9 is reserved for cases where HMRC suspects significant tax fraud. However, it comes with a vital lifeline called the Contractual Disclosure Facility (CDF).
According to the CDF, the HMRC provides a guarantee to you through a legal contract that you will be immune from any form of criminal charges if you disclose all deliberate or non-deliberate tax problems that you might be facing.
But time is of the essence here since the moment you receive the CDF notice, you only have 60 days to either accept the CDF or decline it.
What Happens During the COP9 Process?
Handling a COP9 inquiry is a structured procedure where precise details matter. It typically unfolds across four key stages:
- Stage 1: The 60-Day Notice Period: You need to either accept or reject the CDF contract in writing. Accepting the offer means providing an initial outline disclosure of the nature of the deliberate omissions.
- Stage 2: Rejection Risks: If you reject the offer or do not reply within 60 days, HMRC will proceed to a formal criminal investigation or a tough civil audit utilising their fullest powers of entry, search, and seizure.
- Stage 3: The Disclosure Report: After you accept the offer, your advisors prepare a report based on reconstructing your financial history, estimating tax that was not paid, calculating statutory interest, and mitigation.
- Stage 4: Reaching a Settlement: HMRC reviews the final report and negotiates a monetary settlement covering back taxes, interest, and civil penalties.
Why Expert Representation Is Critical
Attempting to handle COP9 without specialist tax investigation accountants is one of the riskiest mistakes a taxpayer can make.
COP9 case officers from HMRC are highly qualified investigative professionals. In case you fail to provide complete information regarding your taxes or your report seems to be deliberately concealing assets, HMRC has the authority to withdraw your immunity immediately. Besides, fines on civil offenses can be as high as 30% to 100% or more of the outstanding tax bill.
Resolving Serious Tax Enquiries with Confidence
At Wingate Accountants Ltd, we understand the amount of stress that a COP9 investigation places on you and your company. We take total control from the beginning, dealing with all contact between yourselves and the HMRC FIS officers, producing strong disclosure reports, and securing the most favourable penalty structure for you.
Whether you need urgent advice on an active COP9 notice or are seeking dedicated tax disclosure services in London, we provide the legal protection and technical precision needed to bring your tax affairs back into total compliance.
Got the COP9 letter or have any doubts regarding old tax liabilities? Don’t let the 60-day period elapse. Visit Wingate Accountants Ltd immediately to get your free and totally confidential discussion. Or just shoot us an instant message on WhatsApp to learn more about your situation and discuss with an expert.

by web@dmin
5 August 2026







