HMRC audits are primarily triggered by data mismatches, including inconsistencies in tax returns, unexplained fluctuations in income/expenses, and persistent late filings. Using AI-driven tools, HMRC cross-references records with third-party data (banks, Land Registry) to identify anomalies, such as lifestyle discrepancies, high-risk industry activity, or reported figures that deviate from industry norms.
Let's delve into the common triggers that could lead to an HMRC audit:
How Common are HMRC Investigations? Only 7% of all HMRC tax investigations are random checks that aren't triggered by wrongdoing, or any kind of suspicious activity. However, if your tax return looks a little odd, even just one element of it, that could trigger a tax investigation.
Document any legitimate reasons for income fluctuations, such as a new business venture or a change in your personal circumstances. Large or frequent cash transactions can be a red flag, particularly if they are not typical for your industry or personal financial habits.
That being said, it's important to be aware of “triggers” for IRS audits, below is a list of some of the more egregious items.
Businesses that show losses are more likely to be audited, especially if the losses are recurring. The IRS might suspect that you must be making more money than you're reporting. Otherwise, why would you stay in business? Most likely to be audited are taxpayers reporting small business losses.
The most common trigger for an investigation is submitting incorrect figures on a tax return - so it's worth asking an accountant to offer professional advice about your accounts and check over your tax returns before you send them.
In addition, we considered Red Flags from the following five categories (and the 26 numbered examples under them) from Supplement A to Appendix A of the FTC's Red Flags Rule, as they fit our situation: 1) alerts, notifications or warnings from a credit reporting agency; 2) suspicious documents; 3) suspicious personal ...
HMRC has stated that it only uses the AI tools within Connect to look at social media accounts as part of criminal investigations into tax fraud and not as part of its day-to-day activity for regular taxpayers.
HMRC will investigate in detail and retrospectively based on the case and how serious it is. If they suspect deliberate tax evasion, they can investigate as far as 20 years. Investigations into careless tax returns can go back 6 years and investigations into innocent errors can go backup up to 4 years.
You (or your tax pro) will meet with the IRS agent at an IRS office. The IRS usually starts these audits within a year after you file the return, and wraps them up within three to six months.
Not reporting all of your income is an easy-to-avoid red flag that can lead to an audit. Taking excessive business tax deductions and mixing business and personal expenses can lead to an audit. The IRS mostly audits tax returns of those earning more than $200,000 and corporations with more than $10 million in assets.
The 2-year rule for audit is quite simple. If a company meets two or more of the above criteria for two years in a row, then it must have a statutory audit. Conversely, a firm that currently has to be audited can't qualify for an audit exemption until it fails to meet at least two over the criteria over two years.
Common red flags include unreported income and excessive deductions. High earners and digital currency users may face extra scrutiny. Maintaining strong records and specifical documentation can help prevent issues.
You can deposit any amount of cash without being automatically flagged if it's under $10,000 in a single transaction, but banks must report deposits of $10,000 or more to the IRS via a Currency Transaction Report (CTR). While large, legitimate deposits are fine, making multiple deposits to stay under $10,000 (structuring) is illegal and triggers Suspicious Activity Reports (SARs), leading to potential account freezes or law enforcement scrutiny, so transparency with your bank is best for large sums.
Warning signs include:
How to reduce the chances of an HMRC investigation
It detects patterns, connections, and inconsistencies across an enormous range of data sources. The data sources that Connect feeds off of include: Information from other Government agencies/departments (DVLA, DWP, Companies House, Land Registry, electoral roll, council tax records, etc).
Unexplained bank deposits are the top trigger for HMRC tax investigations. Can HMRC see my personal bank accounts? Yes, HMRC can access data from banks, payment platforms, and other sources.
If the deductions, losses, or credits on your return are disproportionately large compared with your income, the IRS may want to take a second look at your return. Taking a big loss from the sale of rental property or other investments can also spike the IRS's curiosity.
The IRS $600 rule refers to a change in reporting requirements for third-party payment apps (like Venmo, PayPal) for taxable income from goods and services, where platforms must send a Form 1099-K if you receive over $600 in a year, intended to capture gig economy/side hustle income, though delays and phased implementation have adjusted the timeline, with current rules for 2024 using a higher threshold ($5,000) before fully phasing to $600 for future years, but remember all taxable income, regardless of form, must always be reported.
The IRS 7-year rule primarily applies to keeping records for claiming a deduction for bad debts or losses from worthless securities, allowing a longer period to file for a credit or refund, but it's not a universal audit limit; it's often a recommended safe buffer for general record-keeping, with the standard IRS audit period usually being 3 years, extending to 6 years for substantial income omission (over 25%) or foreign income issues, and indefinitely for fraud.