The shape of the capital part of the pension system in Poland changed substantially in 2018, as it was extended to Employee Capital Plans. It is important that the costs the prospective pensioners will have to bear (participation in the plan is the default option) are as low as possible. A question arises, whether it will truly come about. The basic rule that should guide the functioning of the pension system entities is in fact to protect the interest of the future retirees, i.e. by maximizing the value of the capital they accumulated and by lowering the costs they have to carry. Taking that into account, our analysis seems to be fully justified. In particular, due to the liquidation plans for OFE, a comparison of the costs of OFE with that of target-date funds which are going to be established as part of Employee Capital Plans sounds interesting and reasonable. Especially, if we take into account that the establishment of Employee Capital Plans and the liquidation of OFE coincide. In this article we present not only a comparison of the cost of OFE with that of target-date funds but we also derive a synthetic formula which allows us to assess costs within the investment horizon.