Is my salary considered mixed [with unlawful earnings] if I work as a technical support engineer in an IT company that produces an operating system sold to foreign banks, and I provided assistance to one of these banks with an issue related to the operating system, and how can I rid myself of the unlawful part in this case? Is it by calculating the number of hours I worked on this issue and donating that amount to the poor, knowing that I receive my salary from the company and nothing from the bank?
Your work as a technical support engineer for an operating system is originally permissible. If you encounter anything that involves assisting in what is forbidden, avoid it. You are not required to dispose of the salary you receive, because it is in exchange for your permissible work. Providing services to usurious banks is an incidental matter that does not affect your salary. However, if you dispose of the portion that corresponds to the forbidden services and spend it on charitable acts, that is good.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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