The Supreme Court has told Birmingham City Council it must abide by a previous High Court ruling that it underpaid former female employees, which could pave the way for huge compensation claims.
It's a landmark ruling that could see millions handed out in claims by Birmingham and other councils.
In 2007 and 2008 about 5000 women were given tens of thousands of pounds in compensation.
The Supreme Court has allowed 174 women to continue with their claims for equal pay compensation against their former employer Birmingham City Council.
Birmingham City Council will find out today whether it has been successful in appealling a legal bid to have hundreds of equal pay claims 'struck out'.
It follows an ongoing dispute over equal pay by some of its female staff. If it is unsuccessful, thousands of potential claimants, could bring their claims through the civil court.