HMRC voluntary disclosure vs investigation: How delay affects penalties

Key Takeaways

1. Make an HMRC voluntary disclosure before HMRC makes contact where possible, as delay can reduce the available penalty reductions and weaken your position.
2. Waiting for an HMRC compliance check may turn an unprompted disclosure into a prompted one, increasing the likely penalty.
3. A complete disclosure should identify unpaid tax, explain the errors, support the calculations and provide relevant business records promptly.
4. Use the appropriate HMRC disclosure facility for the conduct involved, particularly where offshore matters or deliberate behaviour create greater risk.
5. Do not assume disclosure prevents an enquiry, but early cooperation can improve settlement discussions and demonstrate responsible conduct.
6. Seek specialist advice before contacting HMRC where liabilities are substantial, records are incomplete, or deliberate conduct may raise criminal concerns.
7. Go Legal is rated Excellent with over 300 five-star reviews and 5/5 on Trustpilot and Google, placing our solicitors among the best-reviewed litigation lawyers in England and Wales.

Should I Disclose to HMRC Before an Investigation Starts?

In most cases, disclosing before HMRC finds the error preserves access to a lower penalty range. HMRC’s own guidance is direct: “It’s better to contact us and admit any failures or errors rather than wait until we contact you.” It adds that “any penalties we charge on outstanding tax will usually be lower if you tell us about this yourself” (HMRC: Make a voluntary disclosure).

Speed alone is not enough. A rushed notification can weaken the eventual penalty reduction, because HMRC also considers the quality of the disclosure. A business should distinguish three stages:

1. Identifying an issue internally, such as an inaccurate return, unpaid tax or an accounting error.
2. Notifying HMRC that a disclosure will be made.
3. Making the full disclosure, with calculations, records, an explanation and payment or agreed payment arrangements.

Use this decision flowchart before contacting HMRC:

• Have you identified unpaid tax or an inaccurate return? – If no, investigate the concern and preserve relevant records.
• If yes, continue.
• Has HMRC contacted the business about the relevant tax, activity or issue?
  • If no, the disclosure may be unprompted.
  • If yes, assess the scope of the contact before responding.
• Could the issue involve deliberate conduct, offshore matters or criminal-investigation concerns?
  • If yes, obtain specialist legal advice before making admissions.
• Do you have sufficient records to explain the error and begin quantifying it?
  • If yes, prepare the appropriate disclosure route.
• If no, preserve available evidence and establish how figures can be reconstructed.
• Is an HMRC disclosure facility appropriate?
  • The Digital Disclosure Service may be suitable for many unpaid tax disclosures.
  • The Contractual Disclosure Facility may be relevant where deliberate conduct caused a loss of tax.
  • Offshore matters may require the Worldwide Disclosure Facility.

How Much Can an HMRC Voluntary Disclosure Reduce a Penalty?

There is no universal penalty reduction for every HMRC voluntary disclosure, because the outcome depends on the conduct, the tax issue and the applicable penalty regime.

The commercial difference between voluntary disclosure vs investigation usually turns on:

• whether the conduct was careless or deliberate;
• whether HMRC treats the disclosure as unprompted or prompted;
• the applicable penalty range;
• the quality of the disclosure;
• delay in beginning to tell HMRC about the issue; and
• whether HMRC finds further inaccuracies or omissions.

For inaccuracy penalties, HMRC states that an unprompted disclosure of a careless inaccuracy can reduce the penalty to nil. For a prompted disclosure, each penalty can be reduced by up to half of the maximum penalty. For deliberate but not concealed inaccuracies, HMRC gives an unprompted penalty range of 20% to 70% of the tax loss (HMRC Compliance Handbook CH82470). These figures do not apply to every tax error or disclosure route.

Timing fixes the available minimum penalty, while disclosure quality decides where HMRC places the penalty within that range. HMRC applies disclosure reductions to the penalty range, and the minimum is lower for an unprompted disclosure (CH403201). The penalty percentage cannot be reduced below the applicable minimum (CH82410).

What Is an Unprompted Disclosure to HMRC and When Does It Become Prompted?

An unprompted disclosure is one made when the business has no reason to believe HMRC has discovered, or is about to discover, the relevant failure (CH403202).

Any other disclosure is prompted. HMRC’s manual states that “there can be no halfway house between unprompted and prompted disclosure” (CH82420).

The test is objective. It turns on the facts and circumstances, not on what a director says they believed (CH73140). HMRC gives examples of circumstances that may make a disclosure prompted, including where HMRC has:

• obtained information about the relevant obligation or tax position;
• contacted the business about the relevant tax or activity; or
• discovered another failure during a compliance check.

A disclosure made during a compliance check will usually, but not always, be prompted. An issue outside the scope of the check may still be unprompted if HMRC would not have found it in the normal course of that check.

The wording of HMRC’s correspondence therefore matters. A letter about one area of a company’s affairs does not automatically decide the treatment of a separate VAT or offshore issue. The connection between the HMRC enquiry and the additional error needs careful analysis.

Which HMRC Disclosure Facility Should a Business Use?

The appropriate HMRC disclosure facility depends on the nature of the tax issue, the conduct involved and whether HMRC has already made contact.

How Does the HMRC Digital Disclosure Service Work?

The Digital Disclosure Service is a route for notifying HMRC and making a structured disclosure of unpaid liabilities. The usual process involves:

1. Notifying HMRC that the business intends to make a disclosure.
2. Preparing the unpaid tax calculations and supporting explanation.
3. Submitting the disclosure, including a formal offer.
4. Paying the amount owed or agreeing payment arrangements with HMRC.
5. Cooperating with HMRC while it considers the disclosure.

HMRC states that the disclosure must be made within 90 days of the date HMRC acknowledges the notification (HMRC disclosure guidance). That period governs submitting the disclosure itself. It does not mean every tax liability or historic period follows the same timetable, and HMRC’s guidance looks back over different numbers of years depending on the tax and the behaviour involved.

When Should a Business Consider the Contractual Disclosure Facility?

The Contractual Disclosure Facility is for deliberate behaviour that has caused a loss of tax. HMRC states that it is the only disclosure route giving its stated assurance that it will not open a criminal investigation into the disclosure, provided the contractual conditions are met.

Deliberate conduct requires careful handling. A poorly framed explanation, incomplete admission or inconsistent account can create serious risks. Legal advice should be obtained before the business makes admissions about intent, knowledge or the role of individual directors.

When Is the Worldwide Disclosure Facility Relevant?

The Worldwide Disclosure Facility may be relevant where unpaid tax involves offshore income, gains, assets or transfers. A business should review the offshore element before treating the issue as a standard domestic disclosure, because existing HMRC contact and the scope of the tax issue may affect the available route.

How Do You Prepare a Defensible HMRC Voluntary Disclosure?

A defensible HMRC voluntary disclosure gives HMRC a complete, evidenced explanation of what went wrong, how much tax is unpaid and how the business reached its figures.

What Should a Business Check Before Notifying HMRC?

A practical pre-notification review should:

1. Identify each affected tax, return, accounting period and business entity.
2. Establish how the error occurred and whether the facts may indicate careless or deliberate conduct.
3. Collect bank statements, ledgers, invoices, payroll records, VAT records, tax returns and relevant correspondence.
4. Reconstruct missing information using a transparent and evidenced method where complete records are unavailable.
5. Calculate unpaid tax, interest and the potential penalty position.
6. Assess payment capacity and whether payment arrangements may be needed.
7. Decide whether the facts require specialist advice before any contact with HMRC.

How Does HMRC Assess the Quality of a Disclosure?

HMRC assesses disclosure quality through three elements (CH82430):

• Telling HMRC about the inaccuracy.
• Helping HMRC quantify the liability.
• Giving access to relevant records.

HMRC’s published guide weights these elements at 30% for telling, 40% for helping and 30% for giving access. Helping carries the most weight. A business that supplies clear calculations and answers questions promptly can therefore recover ground that a bare notification cannot. A taxpayer making an unprompted disclosure of the full nature and extent of an inaccuracy is entitled to the maximum reduction for telling (CH82444).

Delay also costs money. HMRC states that the maximum reduction may be restricted by 10 percentage points to reflect delay in beginning to tell HMRC about an inaccuracy (CH82465).

What Happens if HMRC Has Already Started a Compliance Check or Investigation?

A business can still disclose unpaid tax after HMRC contact, but the tactical position has usually changed because the disclosure is likely to be prompted.

HMRC states that a full and early disclosure can still influence the penalty sought during an ongoing enquiry or investigation. It also states that it is unlikely to accept a campaign disclosure where an enquiry or compliance check was already open before notification.

The immediate priorities are:

• do not ignore HMRC correspondence;
• preserve paper and electronic records;
• review the precise scope of the compliance check;
• avoid incomplete or inconsistent explanations;
• identify every related issue before responding; and
• seek advice before responding where deliberate conduct or substantial liabilities may be involved.

Do not assume HMRC’s enquiry is limited to the first issue raised. Leaving out a material issue can undermine the disclosure, and HMRC’s guidance addresses what happens where important information is left out or comes to light after a disclosure has been accepted.

Frequently Asked Questions

How Our Solicitors Can Help With Your HMRC Voluntary Disclosure

Go Legal is a London-based commercial litigation law firm acting for individuals, directors, professionals and businesses across England & Wales. Our solicitors treat HMRC voluntary disclosure as a legal and commercial decision rather than a form-filling exercise. We can:

• assess whether disclosure is likely to be unprompted or prompted before contact;
• identify the conduct, tax exposures, records and commercial risks affecting strategy;
• advise on the appropriate HMRC disclosure facility;
• prepare a clear narrative, supported calculations and an evidence pack;
• manage HMRC correspondence, enquiries, formal offers and settlement discussions;
• assist with incomplete records, defensible estimates, payment capacity and payment-arrangement discussions; and
• support directors and businesses where criminal-investigation risk requires a cautious approach.

Delay has a real cost. Once HMRC has reason to believe it has found, or is about to find, the problem, the disclosure becomes prompted and the minimum penalty rises. Late or incomplete disclosures can also lose part of the available reduction.