Is it permissible to take a 10% commission (3% for the employee and 7% for the company) in exchange for cashing truck vouchers, provided that this commission is paid after a month or more?

If your work is based on brokerage, there is no harm in taking a commission from both parties or one of them, according to custom or agreement. Scholars have differed regarding the permissibility of the commission being a percentage of the profit. The majority of scholars stipulated that the commission must be known, and being a percentage of the profit leads to its uncertainty. However, some scholars permitted this, and this opinion has considerable merit.