What is the ruling on working as head of accounting in a company that deals with a usurious bank? Is the salary earned from this work forbidden? Is it permissible to delegate another person to carry out usurious transactions and remain in the job? Is it obligatory to leave this job immediately or after finding another opportunity? Is it permissible to accept a salary increase or a bonus from this work?

This transaction is a loan with interest, which is forbidden usury. The questioner's work is prohibited, and the wage he receives for it is considered ill-gotten gain that must be disposed of. The money he possesses must be spent on Muslim welfare or given to the poor and needy, along with sincere repentance and immediately leaving this job, unless there is a compelling necessity. Do not give the work to someone else. If you can advise the employers, then do so; otherwise, look for another job. As for the bonus they gave you, it is permissible to take it if it was not in exchange for your work at the company.