Oak Lodge business Centre, School lane, Norwich NR9 3LB

We’ve been online and independent since 1999, when we launched to help contractors count the cost of the then newly released IR35 tax legislation. Still owned by founder and former IT contractor Dave Chaplin, the site has grown to become the expert guide to contracting. Dave is the CEO, supported by a dedicated team of contractors and freelancers. Our monthly audience of over 150,000 readers is made up of contractors, freelancers, interims and consultants from the IT, telecoms, engineering, oil, gas and energy, business, marketing and medical sectors.

Dave Chaplin is also the author of both the Contractors’ Handbook and Beat IR35.


ContractorCalculator offers:

  • A comprehensive range of essential online financial salary and tax calculators
  • High quality content from a professional editorial team
  • Expert commentary and analysis from industry and sector leaders
  • More than 1,000 online articles and contractor guides suitable for beginners and veterans
  • Access to leading contractor services.
  • Online IR35 testing tools

Services provided