A quarter of businesses with more than 1,000 staff review their benefits offering less frequently than every two years, or even never at all, research reveals.
The Legal & General survey also found that only half (51%) of large firms evaluate their benefits annually, with one in five (19%) doing so every two years.
The remaining 5% declined to answer the question.
Despite these figures, large firms do far better than their smaller colleagues.
For firms employing less than 100 staff, 41% said they reviewed their benefits less frequently than every two years or even never, a figure that was matched (42%) by organisations with 250 to 999 employees.
Curiously, businesses with 100 to 249 staff were almost as likely as the largest firms to review benefits allocation annually (46%).
L&G also revealed that over half of respondents with more than 250 staff offered ‘above average' employee benefits to attract staff, but nearly four fifths of small firms said they had only the bare minimum or just enough to attract and retain valued staff.
The insurer suggested that the results showed small firms are disadvantaged by irregularly reviewing their employee offer.
It noted that reviewing benefits regularly was important as offering the right package played an important role in attracting and retaining staff.
Legal & General Group Income Protection managing director Diane Buckley, said: "These figures show that employers should ensure that good quality support is available in the workplace to help employees.
"It is concerning that nearly two fifths of small firms aren't reviewing their employee benefits regularly, as benefits are critical to attract and retain staff."
