Four working single mothers have won a High Court challenge over the government’s universal credit scheme.
They argued a “fundamental problem” with the system meant their monthly payments varied “enormously”, leaving them out of pocket and struggling financially.
Lawyers for the women said the problem was likely to affect “tens of thousands of people” claiming the benefit.
A DWP spokesman said: “We are carefully considering the court’s judgment.”
It comes as Work and Pensions Secretary Amber Rudd announced a raft of changes to the government’s flagship scheme .
She also confirmed she would delay asking Parliament to authorise the transfer of three million people on to universal credit until next year, after a pilot of the transfer from existing benefits has been completed.
Universal credit is a means-tested benefit, rolling six separate benefits into one payment.
It has proved controversial almost from its inception, with reports of IT issues, massive overspends, administrative problems and delays to the scheme’s roll-out.
On Friday, it was announced that Danielle Johnson, Claire Woods, Erin Barrett and Katie Stewart had succeeded in a judicial review action against the government over the method used to calculate payments.
It followed a hearing in November when the court was told the women were struggling financially, with some falling into debt or relying on food banks .