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CV Screen's analysis of over 500 candidates looked at the length of time that IT professionals remain in their current position, before applying for new roles.
The company said most HR and IT managers would not be surprised about the three-year job turnover rate.
The factors that motivate staff to leave are salary, lack of career progression, and commuting distances. But CV Screen said online job boards are now an increasing factor.
"The job boards give candidates ready access to information on IT salaries and demand for staff, which enables them to assess their worth within the IT market," said CV Screen.
With a more proactive workforce unwilling to remain in roles where they are not valued, said CV, management needs to offer IT staff personal development plans and regular appraisals to ensure that staff retention within IT departments does not suffer.