Many entrepreneurs in the United Kingdom are not aware of how advanced the analytical tools used by HMRC on a daily basis really are. One of the key systems used by the tax authority is CONNECT — an advanced platform that allows tax irregularities to be identified based on vast datasets collected from multiple independent sources.
The system was launched in 2010 and developed by BAE Systems, a company well known for solutions used in the defence sector and by intelligence services. CONNECT is not a typical accounting program — it is a comprehensive data platform that integrates information from over 30 institutions and analyses it for tax risk.
Where does CONNECT obtain its data from?
The range of data sources used by HMRC is very broad. The system automatically collects and processes, among others:
- data from banks and credit card providers,
- information from Companies House and the Land Registry,
- DVLA vehicle records,
- data from platforms such as Airbnb, eBay, Booking.com, Uber,
- card transaction histories, PayPal, Revolut,
- social media activity,
- data from foreign institutions, including the OECD.
CONNECT is also linked with databases of the Department for Work and Pensions (DWP), the Home Office, and international systems, allowing HMRC to detect overseas bank accounts or property holdings.
How does CONNECT work?
The system analyses all collected information and compares it with data declared in tax returns. If significant discrepancies appear, the system automatically generates an alert for HMRC.
For example:
- a taxpayer declares income of £25,000,
- at the same time purchases a car worth £80,000,
- or owns several properties rented out on Airbnb that have not been reported in Self Assessment.
In such situations, CONNECT flags the taxpayer as potentially high risk.
Importantly, the system does not analyse individual transactions in isolation. It creates a comprehensive taxpayer profile by linking financial data, geolocation, accounts, VAT and PAYE history, and even public social media activity. Using artificial intelligence, it can detect recurring patterns and anomalies that might escape human analysis.
Who most often appears on CONNECT’s radar?
HMRC primarily uses this system to identify:
- property landlords who fail to declare rental income,
- self-employed individuals who do not report their full income,
- businesses underreporting VAT,
- individuals holding offshore accounts,
- entrepreneurs trading online (e.g. eBay, Etsy) without registering a business.
Can CONNECT make mistakes?
Yes. Like any automated tool, the system is not infallible. Sometimes it incorrectly links data or misinterprets certain transactions. Receiving a letter from HMRC does not automatically mean that a taxpayer has made an error — often a proper explanation supported by documentation is sufficient.
How to prepare your business for CONNECT analysis?
The most effective approach is to maintain clear and accurate records:
- properly kept accounting records,
- complete and timely VAT returns,
- Self Assessment consistent with actual activity,
- consistency between bank accounts, payment systems, and company documentation.
If your books and returns are in order and income and expenses are properly documented, the CONNECT system should not pose a threat.
If you are unsure whether your business is prepared for the level of analysis used by HMRC, or want to ensure that your returns are consistent and compliant — contact us at ProsperX. We will be happy to help.