Is money earned from working as an accountant for a dance school considered unlawful (haram), and what should be done with money previously earned from this work?

Dancing that does not observe the Shariah controls, such as that accompanied by musical instruments, or mixed dancing, or that which involves nudity and effeminacy, is unlawful (haram) in Islamic law. It is not permissible to work in a school that engages in this type of dancing, even if the job is an accountant, because that is considered cooperation in sin and falsehood. The earnings acquired from such work are illicit (khabith) and must be disposed of by spending them on the welfare of Muslims, the poor, and the needy, along with seeking forgiveness and repentance.