What is the ruling on a savings fund that deducts a monthly sum from an employee and sells him goods in installments, with a 6% interest charged per year?

If the company's fund first buys the commodity for itself, then sells it to the buyer at the same price or more, either in installments or cash, with the price determined and no increase stipulated in case of delay, then this is permissible, and it is permissible to participate in it. However, if the transaction is forbidden, then participation is not allowed; because it falls under cooperating in sin and aggression, which is forbidden by Islamic law.