Overseas Income May Be Taxable: Why HMRC’s Nudge Letters and Disclosure Facility Matter

These days, it's much harder to keep money or income hidden overseas. Tax authorities around the world including HMRC in the UK are working closely together and sharing financial information. To deal with offshore tax evasion, HMRC set up the Worldwide Disclosure Facility (WDF), which gives people a chance to come forward and correct any mistakes in their tax affairs. 

At the same time, HMRC has started sending out “nudge letters” which are official letters that suggest you may have undeclared income or assets abroad. These letters are based on information HMRC receives from overseas, and they encourage you to double check your tax returns or make disclosure if tax return has never been filed and fix any issues before HMRC takes further action. HMRC is receiving major investment to strengthen tax enforcement, including £100 million to hire 500 new compliance officers and £79 million for external debt collection. This builds on plans to add 1,800 debt management staff, highlighting a strong focus on improving tax recovery. 

This article explains the WDF in clear terms including who can use it, how the process works, what penalties might apply, and why it’s important to take nudge letters seriously. Whether you're a UK Resident with foreign income, a trustee handling assets overseas, or a business with international ties, knowing how the WDF works can help you stay on the right side of the law and avoid costly mistakes. 

What is the WDF? 

The WDF Facility is a voluntary disclosure mechanism launched by HMRC on 5 September 2016, aimed at helping taxpayers regularise their offshore tax affairs. 

The WDF gives individuals, companies, and trusts a chance to come forward and declare offshore income, assets, or gains they haven’t told HMRC about before. It is open to both UK residents and non-residents who have a UK tax liability. 

Who can Use the WDF? Eligibility and Scope 

WDF is available to anyone who has a UK tax liability connected, either fully or partially, to offshore matters. This includes a wide range of situations, such as: 

• Income from outside the UK such as interest from foreign bank accounts, dividends from overseas companies, rental income from properties abroad, or earnings from work done mostly outside the UK while still being a UK tax resident. 
• Assets located or held outside the UK which includes undeclared capital gains from selling foreign property or investments, as well as undisclosed offshore bank accounts or other financial assets. 
• Activities carried out mostly or entirely outside the UK. 
• Money linked to unpaid UK tax that has been transferred to or held in a foreign country. 

The WDF can be used by: 

• Individuals, for their own tax affairs or for company tax affairs if they are a director or company secretary. 
• Companies. 
• Trusts or estates. 
• Representatives acting on behalf of others, such as tax advisers, executors, or personal representatives. 

It is important to note that non-UK residents can also use the WDF if they have UK tax obligations related to offshore matters. 

This includes matters such as:

• Earning UK-source income (e.g. rent, business income from UK) 
• Holding offshore assets from when they were UK resident 

The WDF Process: A Step-by-Step Guide 

The WDF operates in two main stages: notification and disclosure. 

The first crucial step is to notify HMRC of your intention to make a disclosure via their Digital Disclosure Service (DDS). This should be done as soon as you become aware of any undeclared offshore tax matters. 

• Information required for notification: Your name, address, National Insurance number, Unique Taxpayer Reference (UTR), date of birth, and details of any agent acting for you. 
• Importance of "unprompted" status: Notifying HMRC before they contact you (e.g., with a "nudge letter" based on CRS data) is critical. An unprompted disclosure generally leads to lower penalties. 

HMRC will require a separate notification for each person and if the disclosure is for a company and for a director this should be on 2 separate disclosures. 

Once notified, HMRC will confirm receipt and issue HMRC issues both a disclosure reference number and a payment reference number for tracking and payment purposes. 

Crucially, once you notify HMRC, you have 90 days to gather all necessary information, calculate your liabilities, and complete your full disclosure. Within the 90-day window (which can be extended to 180 days in exceptionally complex cases), you must complete and submit your comprehensive disclosure via the DDS. This involves several detailed steps: 

Capacity and prompting

First, you need to indicate whether you are making the disclosure for yourself, your company, a trust or estate, or someone else. You'll also need to state if your disclosure was prompted by a letter from HMRC (a "nudge letter").

Tax Years Covered

Usually, you need to cover all tax years up to the most recently completed one. But if you have any unfiled tax returns for recent years, these must be filed separately and not included in your WDF disclosure.

Describe Your Behaviour

You have to explain why the income or gains were not declared. This is very important because it affects how many years you have to go back and the size of any penalties. You will have pick from options like:

• You forgot to tell HMRC but had a good reason (or no good reason). 
• You made mistakes on your return by accident or through carelessness. 
• You didn’t file a return but had a good excuse. 
• You deliberately didn’t tell HMRC or deliberately gave false information. 

If you’re unsure which behaviour option applies to you, you must seek professional advice. 

Calculate Your Tax Owed

You need to work out exactly how much tax you owe for each year, including Income Tax, Capital Gains Tax, and any other relevant taxes. You also will have to calculate the interest due on unpaid tax, starting from when the tax should have been paid until you actually pay it. HMRC offers calculators to help but getting help from a tax professional is highly recommended to avoid mistakes.

Calculate Penalties

Penalties for offshore tax issues are usually higher than those for UK tax issues. The penalty depends on how you described your behaviour and which country your offshore assets or income relate to. Penalties will be discussed in detail later. 

In addition, when making a disclosure under the WDF, you should clearly explain any relevant tax rules you’ve relied on, such as those about residency or trusts, Declare the highest total value of your offshore assets over the last five years, converting all amounts to Pounds Sterling. List up to three main countries involved using HMRC’s country codes. You must pay all tax, interest, and penalties when you submit if you can’t, contact HMRC in advance to set up a payment plan. 

What Happens After You Submit Your Disclosure? 

Acknowledgement of Receipt: HMRC aims to acknowledge receipt of your completed disclosure within approximately 15 days. However, based on our previous experience working with clients, the process can sometimes take over a month to complete. 

Notification of Intended Course of Action: Typically, within 90 days of acknowledgement, HMRC will issue a letter outlining their intended course of action. However, due to the volume of disclosures received, delays in issuing this communication may occur. 

Review and Cooperation: While the majority of disclosures are accepted without the need for a detailed enquiry, HMRC may request additional evidence or information to verify the accuracy and completeness of your disclosure. It is essential to cooperate fully with any such requests. Failure to provide the requested information or to cooperate may jeopardise the acceptance of your disclosure under the terms of the WDF. 

Consequences of Non-Compliance or Inaccuracy: If you don’t give HMRC all the correct information, or if you refuse to share what they ask for, there can be serious consequences. They might charge you a bigger penalty than if you had been open and cooperative from the start. HMRC could also start an official investigation, which might be about your taxes or even a criminal case if they think something illegal happened.  

In some situations, they may share your details publicly on the GOV.UK website. If the case is serious, you might even be taken to court and face criminal charges, especially if HMRC wants to set an example to discourage others. 

HMRC Letter Regarding Offshore Assets (‘NUDGE' Letter)? 

HMRC has been sending ‘nudge’ letters to thousands of people they believe might not have paid the right amount of tax. More of these letters are expected to go out in the future. 

You might receive a nudge letter if HMRC believes: 

• You have offshore income or assets (e.g. overseas property, bank accounts, trusts, or investments). 
• Your UK tax returns may be incomplete or incorrect. 
• They have received data under international information-sharing agreements (such as the Common Reporting Standard). 

The letter usually says that HMRC has found information showing you may have income or assets overseas. They will ask you to confirm whether your tax affairs are fully up to date. In other words, they want to know if you’ve declared everything you should have. 

The letter also includes a form called a "certificate of tax position." You’ll be asked to sign this and choose one of two options: either confirm that you don’t need to make any changes to your tax returns or confirm that you will make a voluntary disclosure to correct anything that’s missing. 

Here is a sample of nudge letter: 

In short, the letter is a warning and an opportunity to come forward voluntarily if any tax has been underpaid. 

What to Do if you Receive a Nudge Letter from HMRC? 

Receiving a nudge letter from HM Revenue & Customs (HMRC) can be alarming, but it is not a formal investigation. Instead, it's a signal that HMRC suspects there may be undeclared income or gains, often related to offshore assets, foreign property, or overseas income. These letters are part of HMRC’s push to encourage voluntary disclosure before initiating formal enquiries. 

While a nudge letter may appear general in tone, it should be taken seriously. It typically invites you to review your tax affairs and correct any inaccuracies. Failing to respond can lead HMRC to escalate the matter potentially resulting in a civil investigation or, in severe cases, criminal proceedings.  

The first step is to carefully read the letter and understand what HMRC is focusing on. In many cases, the concern involves foreign income, cryptocurrency gains, or non-UK bank accounts. Identifying this focus will help guide your response. On receiving the letter, the following steps should be followed. 

Perhaps the most important step is to engage a qualified tax advisor, ideally one with experience in offshore compliance or HMRC investigations. These professionals can:

• Conduct a full review of your onshore and offshore tax position 
• Identify any areas where your reporting may have fallen short 
• Interpret HMRC’s concerns and advise on how best to respond 
• Clarify complex rules, such as those relating to the remittance basis, double tax treaties, or the taxation of trusts 

A good advisor will not only help you understand the nudge letter but will also protect your position if HMRC's interpretation of your situation is incorrect. 

UK Property Accountants can assist you throughout the disclosure process, handling all related enquiries, tax calculations, and correspondence with HMRC. Our team ensures that your disclosure is accurate, compliant, and professionally managed from start to finish. 

The next step is to collect all relevant documents for the period in question. This includes: 

• Bank statements and investment records (both UK and overseas) 
• Details of foreign properties or trusts 
• Tax returns for the relevant years 
• Any other documents relating to offshore income or assets 

This process ensures that you have a complete picture of your tax position before deciding how to respond. 

Many nudge letters include a “Certificate of Tax Position” which is a form that asks you to confirm whether your tax affairs are correct. Signing this certificate carries significant legal weight. If the declaration turns out to be false, even unintentionally, it can lead to serious penalties or criminal charges.  

Once you or your advisor has reviewed your position, there are two possible outcomes:

• No Disclosure Required: If your tax returns are accurate and complete, your advisor can write to HMRC to explain your position. This proactive response can help prevent a formal enquiry. 
• Disclosure Required: If your advisor finds errors or omissions particularly relating to offshore matters then a disclosure should be made.  

Even if the disclosure is considered “prompted” (because of the nudge letter), making a voluntary disclosure through the WDF can lead to significantly lower penalties compared to waiting for HMRC to open a formal investigation. UK Property Accountants will guide you through the WDF process, which includes: 

• Reporting tax liabilities for all relevant years 
• Calculating interest and penalties 
• Declaring offshore assets and jurisdictions 
• Describing the behaviour that led to non-compliance 
• Submitting full payment or negotiating a payment plan (Time to Pay) 

Rejection of Disclosure and higher penalties 

 There are certain situations which may affect eligibility or lead to higher penalties: 

• Criminal Property: HMRC has the discretion to refuse an application if they suspect any part of the disclosed assets or funds are derived from criminal activity. 
• Existing Enquiries: Disclosures made by taxpayers already under enquiry, or those involving Disclosure of Tax Avoidance Schemes (DOTAS) arrangements, will be referred to the investigating officer for review for acceptance. 
• Prior Settlements: If you've previously settled an in-depth enquiry or made a disclosure, a new disclosure covering the same period might result in a higher penalty. 

If you are uncertain about whether you qualify for the WDF, it is essential to seek professional advice. We can guide you through the disclosure process and are available to assist you every step of the way. 

Penalties 

As discussed earlier, the penalty depends on how you described your behaviour and which country your offshore assets or income relate to. 

Territory Categories & Maximum Penalties 

Classification of Countries into the Respective categories

To put it simply, the best time to sort out any unpaid taxes is now before HMRC contacts you. If you choose to come forward voluntarily using the WDF, you could end up paying much lower penalties. But once HMRC starts an investigation, those penalties usually go up. 

If you’ve never filed a tax return and haven’t told HMRC that you owe tax, the following penalties may apply. 

These penalty rates apply specifically to countries classified under Category 1 territories. 

For detailed information regarding penalties applicable to Category 2 and Category 3 territories, please visit to the official HMRC guidance: Compliance checks — CC/FS17: penalties for offshore non-compliance - GOV.UK 

Understanding the definition of behaviour 

• Non-Deliberate: Applies when the omission was due to ignorance or circumstances rather than intent. 
• Deliberate (not concealed): Applies when the individual knowingly failed to report rental income but did not take further steps to hide it. 
• Deliberate and Concealed: Applies when the individual both failed to disclose and actively tried to conceal the income. 

However, the penalties for failing to notify HMRC can vary depending on how late the disclosure is whether it's within 12 months or more than 12 months after the tax was due.

For further detailed information, please visit the HMRC compliance check - CC/FS17: penalties for offshore non-compliance.

Conclusion

Dealing with offshore income and assets is a serious matter, especially in today’s world of international data sharing. HMRC’s WDF offers a chance to come forward voluntarily and correct any mistakes before more serious action is taken. If you’ve received a nudge letter or believe you may have offshore tax liabilities, it’s crucial to act quickly, review your position carefully, and seek professional advice.

A well-prepared disclosure not only reduces penalties but also helps you stay compliant and avoid potential legal consequences. Taking early action is the best way to protect yourself and bring your tax affairs fully up to date.