Many smaller firms are unaware of new employment rules giving more workers the right to request flexible working, according to a new report.
The change comes into force on June 30, when anyone who has been employed for six months will be able to ask for flexible arrangements.
Research by QualitySolicitors found that three out of four smaller companies did not know about the new rules or had taken no steps to prepare for them.
A survey of 250 firms found that the number saying they were ready for the change varied from 42% in Yorkshire to 14% in the East Midlands.
John Baden-Daintree of QualitySolicitors, said: "Uncertainty over how these new rules will be interpreted is what will concern many employers."