HMRC last week launched a specialist task force to target tax evasion on rented properties.
The task force covers East Anglia, London, Leeds, York, Leicester, Nottingham, Lincoln, Durham and Sunderland and is expected to recover more than £17m from tax evaders.
The property rental team is one of a number of HMRC specialist task forces undertaking intensive bursts of activity in specific high-risk trade sectors and locations in the UK.
HMRC has launched 12 task forces for 2011/12 and 30 more will follow in 2012/13.
The teams will visit traders to examine their records and carry out other investigations.
David Gauke, exchequer secretary, says HMRC is on target to collect more than £50m as a result of the task forces launched in 2011/12.