Markets regulator Sebi is considering to reduce the additional expenses charged by mutual funds by 15 basis points, a move aimed at increasing penetration of such products among investors. The proposal, based on an internal study by Sebi on mutual funds, will be discussed at the regulator's board meeting this week, senior officials said. As per the proposal, the additional expense of 20 basis points may be reduced to 5 basis points across all mutual fund schemes and this need to be reviewed every two years, they added.