Does HMRC Investigate Every Tip-Off They Receive? (And How They Decide)

Does HMRC investigate every tip-off they receive? The short answer is no, and understanding why not could matter enormously if you think someone has reported you to HMRC.

HMRC received a record 170,992 tip-offs in the 2025–26 tax year alone. They cannot, and do not, investigate every single one. Instead, each report is triaged, cross-checked against existing data, and assessed against a set of defined criteria before any action is taken. Most tip-offs are never acted upon.

Whether you are worried that someone has reported you, or you are considering reporting someone else, this guide explains exactly how HMRC decides which tip-offs to pursue. It also goes into what rights you have, and what to do if you think you are already in their sights.

Does HMRC Investigate Every Tip-Off?

No. HMRC does not investigate every tip-off it receives. With a large volume of reports, HMRC simply lacks the resources to pursue each one. Instead, a dedicated intelligence team triages every report and cross-references it with data already held across HMRC's own systems and third-party databases. A priority level is assigned to the matter, based on a set of internal criteria.

How Many Tip-Offs Does HMRC Receive?

The volume of reports HMRC receives has grown sharply in recent years:

• 2022–23: 157,270 reports received
• 2023–24: 151,763 reports received
• 2024–25: 164,670 reports received (a 9% year-on-year increase)
• 2025–26: 170,992 reports received — a new record

The surge is partly driven by HMRC's Strengthened Reward Scheme (from November 2025). In qualifying cases which meet the scheme's criteria, the scheme pays between 15% and 30% of the additional tax collected. In 2025–26, HMRC paid £1.4 million in informant rewards, a large jump from previous years.

How HMRC Decides Which Tip-Offs to Act On

So, does HMRC investigate every tip-off? As things stand, there are a number of factors it considers. When a report is received, whether through the HMRC fraud hotline, the online form, or the Strengthened Reward Scheme portal, it is assessed against the following factors:

1. HMRC Connect: Cross-Referencing the Data

HMRC may assess a tip-off against Connect — a data-matching and risk-scoring system that aggregates information from government, commercial, and international databases — as part of its assessment. Connect cross-checks the allegation against bank interest reports, employer payroll data, Land Registry records, digital platform sales, DVLA records, overseas tax authority disclosures, and much more.

A tip-off is likely to be escalated if it is corroborated by data Connect already holds. An example might be a report of undeclared rental income in respect of a property which can be verified by Land Registry records. If the data does not support the allegation, the report is less likely to proceed.

2. Credibility of the Source

In cases where the informant's identity is known (or can be inferred), HMRC considers whether they would plausibly have access to the information provided. A current or former employee of the business being reported carries more credibility than an unverifiable anonymous claim.

HMRC also considers whether the informant may have a personal motive, such as being a disgruntled ex-partner, or may be involved in a business dispute that could undermine the reliability of the information, even if the report is otherwise plausible.

Anonymous tip-offs are accepted and do lead to investigations in some cases. But the absence of a verifiable source means HMRC must rely more heavily on Connect data to corroborate the allegation.

3. Specificity of the Tip

A vague report – 'I think my neighbour is fiddling their taxes' – is far less likely to lead to action than one which contains specific figures, dates, transactions or named accounts. HMRC can cross-reference specific information against its own data holdings; the more precise the allegation, the easier it is to verify and act upon.

4. Materiality of the Alleged Non-Compliance

How much tax is at stake? HMRC will naturally prioritise cases where the potential recovery is significant. A report alleging a small cash-in-hand discrepancy is far less likely to trigger a formal investigation than one suggesting systematic tax evasion running into hundreds of thousands of pounds.

Under the Strengthened Reward Scheme, the minimum threshold for a reward is £1.5 million in recovered tax. This indicates the scale of cases that may qualify for the Strengthened Reward Scheme.

5. Relation to Existing Investigations or Campaigns

If a tip is about someone or a business that is already being investigated, it can be extremely useful in helping HMRC to develop or accelerate an existing case. Furthermore, HMRC runs compliance campaigns from time to time that target specific sectors (such as the construction industry, online traders or landlords). A tip that fits an active campaign is more likely to be picked up quickly.

6. Existing Resources and Priorities

HMRC's ability to investigate may vary depending on operational pressures. A credible tip-off may not be acted on immediately if HMRC's compliance teams are under pressure, but may be logged and revisited. Time-sensitive allegations (where evidence might be destroyed or assets moved) are more likely to be prioritised.

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Can Tip-Offs Be Made Anonymously?

Yes. An anonymous HMRC tip-off can be submitted through:

• The HMRC fraud hotline: 0800 788 887 (available 8 am–8 pm, Monday to Friday)
• The online form at GOV.UK, which allows a report to be made without providing any identifying details
• The Strengthened Reward Scheme portal — for high-value cases where the informant seeks a financial reward (note: a reward cannot be paid anonymously, as HMRC must be able to contact the informant)

Informant identity is treated as confidential by HMRC. They do not routinely disclose the identity of the person who made a report or the existence of the tip-off to the subject under investigation. HMRC may contact the subject if it decides to take formal action.

Does HMRC Pay Informants?

Yes, though the amount and eligibility depend on the route used.

Standard reports (lower-value cases): HMRC has a longstanding discretionary scheme for rewarding informants whose tip-offs result in additional tax being recovered. The amounts are modest and not formula-linked, with total payouts historically amounting to under £1 million per year across all informants combined.

Strengthened Reward Scheme: Informants may be paid between 15% and 30% of the additional tax collected where HMRC recovers at least £1.5 million in additional tax as a direct result of the information supplied. Rewards remain subject to the scheme's applicable rules and HMRC's discretion. There is no guarantee of reward, as HMRC retains full discretion as to whether it pays a reward and, if so, how much, based on a number of factors including quality of information and level of assistance provided during the investigation.

The SRS is intended for serious cases involving substantial tax losses and complex tax affairs. It is not designed for routine neighbourhood disputes or minor discrepancies.

Critically, you cannot receive an SRS reward if you were involved in the tax evasion yourself.

What Happens If Someone Reports You to HMRC?

If a tip-off about you or your business is acted upon, the first signs of HMRC attention typically include:

• A nudge letter — an informal communication flagging a potential discrepancy and inviting you to review your tax position
• An opening letter for a compliance check — a more formal notification that HMRC is looking at specific aspects of your tax affairs
• An enquiry under s.9A TMA 1970 (for self-assessment) or a formal investigation notice — confirming that HMRC is conducting either a full enquiry or an aspect enquiry

You are unlikely to know a tip-off triggered the investigation. HMRC does not disclose the existence or content of reports.

The timeline between a tip-off and HMRC making contact varies considerably, from weeks in urgent cases to months or even years. There are cases where the matter has been logged but is not immediately prioritised. Read our related guide on how to know if HMRC is investigating you for further detail on what to look out for.

What To Do If You Think You Have Been Reported

If you believe someone has reported you to HMRC, or if you have already received contact from them, take the following steps:

1. Do not make unilateral amendments to your tax returns. Panic-amending your previous filings without legal advice can look like an admission of guilt and may prejudice your position significantly. Do not contact HMRC before speaking to a specialist solicitor.

2. Seek legal advice immediately. Communications between you and your solicitor may be protected by legal privilege, meaning they are generally confidential and cannot ordinarily be disclosed to HMRC. You will not generally have the same legal privilege if you speak to an accountant or tax adviser independently.

3. Understand your disclosure options. Depending on the stage of any investigation, there may be a variety of options available ranging from voluntary disclosure to negotiated settlements, which may significantly reduce penalties or avoid prosecution altogether. These options reduce the further an investigation progresses, so early advice is essential.

4. Do not ignore contact from HMRC. If HMRC has already been in touch, failing to respond will not make the matter go away. It may be treated as non-cooperation and could escalate the investigation.

FAQ: HMRC Tip-Offs Explained

Does HMRC act on anonymous tip-offs?

Yes. Anonymous tip-offs can lead to investigations, though HMRC will rely more heavily on its own data systems (such as Connect) to corroborate an allegation that cannot be verified through a known source.

Will I know if someone has reported me to HMRC?

Not immediately. Informant identity is treated as confidential by HMRC. They do not routinely disclose who made a report, and they have no obligation to reveal the existence of a tip-off to the subject under investigation. HMRC may contact the subject if it decides to take formal action.

Does HMRC pay for information?

Yes, in certain circumstances. The Strengthened Reward Scheme offers between 15% and 30% of additional tax recovered in qualifying cases where HMRC collects at least £1.5 million as a direct result of the information. Rewards are discretionary and not guaranteed.

How long after a tip-off does HMRC investigate?

There is no fixed timeline. HMRC may act within weeks if the case is urgent (for example, where there is a risk of asset dissipation), or it may take months or years if the tip-off is logged but not prioritised. In some cases, HMRC may never act — particularly where the allegation is vague, not corroborated by data, or relates to a relatively small amount of tax.

Can a false report to HMRC get someone in trouble?

Deliberately providing false information to HMRC may have legal consequences, depending on the circumstances. In practice, malicious or vexatious reports are hard to prosecute because most tip-offs are made anonymously. However, if an informant's identity is known and they can be shown to have acted fraudulently or maliciously, they may face legal consequences. Under the Strengthened Reward Scheme, providing false information disqualifies an informant from any reward.

What is the HMRC fraud hotline?

The HMRC fraud hotline, 0800 788 887, is a confidential telephone reporting line for members of the public to report suspected tax fraud and evasion. It is available Monday to Friday, 8 am–8 pm.

Worried About a Tip-Off to HMRC About You or Your Business?

The timing of legal advice can affect the options available to you. At Holborn Adams, our specialist fraud solicitors have extensive experience advising clients through HMRC investigations from the very earliest stage. Communications with us may be protected by legal privilege, meaning they are generally confidential and cannot ordinarily be disclosed to HMRC. We can also instruct specialist tax experts who will work under the same privilege protections.

We work on a fixed-fee basis. Our goal is straightforward: to protect your position, clear your name where possible, and secure the best outcome available.

Speak to Holborn Adams today — the earlier we are involved, the more we can do.