HMRC has never been shy about cracking down on unpaid tax—but now, it’s more powerful and data-savvy than ever.
From artificial intelligence to detailed tracking of digital income, the taxman is using advanced tools to uncover what’s often referred to as ‘invisible income’—money that’s not declared, under-reported, or hidden across various channels.
If you’re earning money outside of traditional employment—or working in the gig economy or online—it’s essential to know how HMRC is now spotting income that used to slip through the cracks.
Here’s what you need to know.
No Enquiry Notice Required
HMRC can open an enquiry into any tax return without needing to provide a reason—and usually won’t. Regardless of whether an under-declaration is intentional or accidental, the tax authority has wide-ranging powers to investigate and reclaim what it’s owed.
Meet ‘Connect’: HMRC’s Most Powerful Tool
At the heart of HMRC’s investigations is its in-house analytics system called ‘Connect’. This software cross-references vast amounts of data to identify inconsistencies, behavioural trends, and unusual activity across multiple sources.
Connect has changed how investigations are triggered. Where HMRC once relied on tip-offs or random checks, more than 90% of current enquiries are now prompted by data flagged through Connect.
Its sources include:
- Tax returns and Companies House records
- DVLA and Land Registry databases
- DWP, the UK Border Agency, and other government bodies
- Online platforms such as PayPal and cryptocurrency exchanges
- Social media, Google Street View, and even flight data
If something doesn’t add up, Connect is likely to find it.
Digital Platforms Must Now Report Seller Income
Since January 2024, online platforms in various sectors have been required to collect and report seller income to HMRC.
This applies to platforms like:
- Airbnb (short-term rentals)
- Uber and Bolt (private hire)
- Deliveroo and Just Eat (food delivery)
- eBay and Vinted (personal sales)
These platforms now submit an annual report to HMRC, with the first reports due by 31 January 2025, covering income from the calendar year 2024.
This doesn’t include occasional sellers making fewer than 30 sales per year, but for many side hustlers, gig workers, and landlords, the data trail is now unavoidable.
AI and Geo-Mapping to Target High-Risk Taxpayers
HMRC is also exploring the use of AI to analyse patterns in taxpayer behaviour.
Where Connect gathers and compares data, AI’s role is to learn from that data—helping HMRC predict where risks lie and which taxpayers to investigate.
By combining AI with geo-mapping (data based on physical location), HMRC can spot gaps between lifestyle and income, and target enforcement efforts more accurately.
Tip-Offs Still Play a Role—And Now There’s a Reward Scheme
Despite its tech tools, HMRC still relies heavily on whistle-blowers. Reports from ex-employees, former partners, or unhappy customers often provide the first clues of hidden income.
These can be submitted anonymously through HMRC’s tax evasion hotline or online.
And in March 2025, HMRC announced plans to launch a reward scheme for informants. The proposed system could see whistle-blowers receive up to 25% of the extra tax recovered in cases involving high-net-worth individuals, corporates, or offshore schemes.
While the formal scheme is still being finalised, HMRC may already offer rewards at its discretion.
Cracking Down on ‘Phoenix’ Companies
One final area HMRC is tightening up on is phoenixism—where company directors repeatedly shut down companies to avoid paying tax, only to restart under a new name.
A new initiative with the Insolvency Service will require advance tax payments from directors with a history of phoenixism. In some cases, they may also be made personally liable for unpaid taxes from previous companies.
Why It Matters
Whether you run an online business, own rental property, or simply earn income from non-traditional sources, HMRC’s ability to track income has stepped up dramatically.
Gone are the days when extra income could slip under the radar. With real-time data from digital platforms, sophisticated AI, and direct reporting from the public, it’s never been easier for HMRC to uncover what it calls ‘invisible income’.
Need Help Staying Compliant?
If you’re unsure whether all your income is being reported properly—or want to double-check you’re meeting HMRC’s evolving expectations—get in touch with Jon Davies Accountants.
We’ll help you stay on the right side of the rules and avoid any unexpected visits from the taxman.
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