Coffers at HM Revenue & Customs have been bolstered by £107m thanks to a 35% increase in takings from investigations into business self-assessment, a study by CCH claims.

HMRC has raised £415.3m through investigations into business self-assessment forms over the past year, a 35% increase on last year when it netted £308m.

According to CCH the overall amount of additional tax raised by HMRC in the last year from all personal and business tax enquiries has risen dramatically by 62% from £5.6bn to £9.1bn.

'In the past HMRC have been known to take a general broad brush approach to investigations, but over the past 12 months improvements to their risk profiling system has enabled them to target tax avoidance and evasion more effectively,' said CCH senior consultant Neil Tipping.

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