Can an employee receive both his salary and a share of the profits? Is it permissible for him to receive a bonus in return for his work?
Question

                I work for a company which pays me a fixed salary for the job I do. I help them with their transaction of money, and beside my salary they pay me 8% commission on each transaction I do for them. I am not sure whether it's permissible for me to take this commission or not.
Praise be to Allah.
      What may be understood from your question is that this work 
      for which you receive this percentage as commission is separate from your 
      regular work with the company, for which you receive a fixed salary every 
      month. 

    So this work is under a separate contract between you and the 
    company, and your payment for it is this commission. The scholars differed 
    as to whether it is permissible to make the payment a percentage of the 
    profits. 

    Imam Ahmad (may Allah have mercy on him) was of the view that 
    that is permissible. 

    This has been discussed previously in the answer to question 
    no. 134658. 

    Based on that, there is nothing wrong with you taking this 
    commission in payment for the work that you do. 

    And Allah knows best.