R (Johnson, Woods, Barrett & Stewart) v SSWP [2019] EWHC23 (Admin); SSWP v Johnson, Woods, Barrett & Stewart [2020] EWCA Civ788
This case successfully challenged the rigidity of the monthly assessment period regime under universal credit (UC) and the way that earned income is calculated for certain claimants. The case concerned four single working mothers whose regular monthly pay dates for their wages fell close to the start/end of their assessment periods, resulting in them sometimes having two paydays in one assessment period. This issue caused them to experience fluctuations of their income and significant cash losses.