Men working in medium and large scale organisations earn more money than their female colleagues, according to a BBC report.
The figures, published by the Government, show that almost three quarters (74 per cent) of firms pay more wages in total to male staff.
Meanwhile, 15 per cent of firms pay more to women, while 11 per cent said there is no difference.
The news comes as the Government also announces a new review into workplace diversity among black, Asian and minority ethnic (BAME) groups, in response to the independent McGregor-Smith Review.
The review, published in February last year, called on companies with more than 50 employees to publish a breakdown of their workforce by race and pay band.
But since last year, only businesses with 250 or more employees have been forced to publish their pay data, and only by gender and not by race.
So far, the data has found that the average pay gap across all medium and large-scale firms is 8.2 per cent, but around 8,000 businesses have yet to report.
Carolyn Fairbairn, director general of the CBI, told the BBC that firms are working “very hard” to meet the April 2018 deadline.
In October last year, the Prime Minster Theresa May said the gender pay gap isn’t going to close on its own.
“We need to see a real step-change in the number of companies publishing their gender pay data and offering progression and flexibility for all employees,” she said.
“That’s why today I am calling on more businesses, both small and large, to take action to make sure the gender pay gap is eliminated once and for all.”