HMRC's increased powers for spotting 'invisible income'
HMRC can enquire into any tax return and request information to establish whether that return is correct. No reasons need be given for the enquiry and will invariably not be disclosed. Regardless of the reasons for failing to declare income, the consequences can be serious. HMRC’s enhanced detection capabilities mean that what once might have passed unnoticed is now far more likely to be identified and investigated. Understanding how these powers work, and how HMRC uses data analytics to spot ‘invisible income’, is essential for anyone in self-employment, property investment, or running a business.
What counts as ‘invisible income’?
‘Invisible income’ refers to earnings that haven’t been declared to HMRC. This might include cash payments from clients, rental income that’s been underreported, income from side projects, or fees earned through online platforms. It’s not always about deliberate tax evasion—sometimes it’s simply overlooked or forgotten, particularly if you’re juggling multiple income streams.
The issue for taxpayers is that HMRC doesn’t need to prove dishonesty. If income appears to be missing from a tax return, HMRC can open an enquiry and ask you to justify every figure. The burden of proof effectively shifts to you to demonstrate that your return is correct.
HMRC’s data-matching technology
In recent years, HMRC has invested heavily in data analytics and cross-checking systems. The department now receives information from multiple sources: banks, building societies, payment processors (PayPal, Stripe, etc.), employment agencies, and even social media platforms in some cases. If you’ve received payment into a business bank account but haven’t declared it as income, there’s a significant risk HMRC will spot the discrepancy.
HMRC’s Connect system flags inconsistencies between declared income and financial records. For example, if your bank statements show regular deposits of £2,000 per month but your Self Assessment return reports nil income, you can expect questions. Similarly, if you’re registered as a landlord with Companies House but your property income on your tax return seems suspiciously low compared to market rates, this raises red flags.
Thresholds and trigger points
There are certain thresholds that attract HMRC’s attention. If you’re trading as a sole trader and your turnover exceeds £85,000 (the VAT threshold), HMRC expects you to be VAT-registered and to have submitted VAT returns. Failure to do so, combined with undeclared income, significantly increases enquiry risk.
For property investors, rental income of more than £1,000 per annum must be declared. If you’ve owned a buy-to-let property but haven’t reported rental income, this is a common trigger for investigation.
If you’re receiving payments via third-party platforms—whether it’s freelance work through Upwork, selling goods on eBay, or letting out a spare room through Airbnb—payment processors now report high-value transactions to HMRC. You cannot assume these payments will slip through unnoticed.
What happens when HMRC opens an enquiry?
When HMRC opens a formal enquiry into your tax return, they can request a wide range of documents: bank statements, invoices, contracts, correspondence with clients, and records of cash transactions. You’ll typically have 30 days to respond (though HMRC can extend this).
If HMRC concludes that income has been understated, they’ll issue an amended assessment. You’ll be liable for the unpaid tax, interest (currently running at 8% per annum), and potentially penalties. Penalties for careless behaviour start at 30% of the tax due; for deliberate behaviour, penalties can reach 100%.
The good news is that if you voluntarily disclose undeclared income before HMRC opens an enquiry, you may qualify for a reduced penalty under their voluntary disclosure rules.
Getting it right
The simplest way to avoid these headaches is to ensure all income is properly recorded and declared. Keep detailed records of all earnings, separate personal and business finances, and retain supporting documentation for at least six years. If you’ve had multiple income sources or received cash payments, now is the time to review your records and consider whether your recent returns are complete.
For tailored advice, contact Severn Accounting — we’re here to help.