New figures which indicate that the gender pay gap among directors has risen 22 per cent have been described as "unacceptable".
A survey conducted by Croner Reward for the Institute of Directors (IoD) indicated that the biggest gaps in pay were in the service and voluntary sectors, where women can expect to receive 26 per cent lower pay then their male counterparts.
Meanwhile, the financial services sector has a gender pay differential of nine per cent.
Commenting on the findings, director general of the IoD Miles Templeman said: "It is wholly unacceptable in this day and age that it appears that women in comparable positions do not receive the same rewards as their male counterparts."
Research recently released by Acas suggested that, in Scotland alone, 9286 equal pay and 1178 wage act complaints were raised at employment tribunals over the last 12 months.