They can happen any day of the week. However, mass direct deposits are usually Wednesdays and Fridays. It depends on various factors such as whether you pre-paid preparation fees or chose to have them deducted from your refund. Also, some credit unions, non-traditional banks and various pre-paid cards even post direct deposits several days earlier than anticipated by WMR. If you chose to have preparation fees deducted from your refund, it can be later than the day indicated on the WMR or on the calendar.