Q: Is it true that Muslims regardless if they are making Jumah Salaah or not (e.g. a menstruating lady) must close their business & not receive any income for the duration at all?
A. Those people upon whom Jumu'ah Salaah is Fardh, such as adult males, must stop trading when the first Adhaan goes for Jumu'ah Salaah. It is Haraam for them to continue trading. If there is a female is in the shop during Jumu'ah time, the income will be Halaal but females should not be in business at all, whether they are menstruating or not. This is a separate issue from the question of trading during Jumu'ah time.
Mufti Siraj Desai