Answered by Shaykh Amjad Rasheed
If a man refuses to spend on his wife, saying that she works and spends on herself, is it permissible for him to do that?
If a man has permitted his wife to go out and work, it is haram for him to stop spending on her, even if she is able to spend on herself. It is obligatory for a man to spend on his wife, even if she be rich, though he does have the right to prevent her from going out to work. [As mentioned in the commentaries on Imam Nawawi’s Minhaj]
But if a woman goes out to work without his permission, it is haram and she is considered rebellious (nashiza). Therefore, the obligation of spending on her is dropped from him for every day that she goes out without his permission.
– Amjad
(Translated by Shazia Ahmad)