The Delaware Division of Revenue has updated its publication listing the tax periods and due dates for eighth-monthly, monthly, and quarterly withholding filers. While filing schedules are generally the same – monthly (Form W1) due halfway through following month; eight-monthly (Form W1A) due within 3 business days; and quarterly (Form W1Q) due a month following the end of the quarter – the specific due dates have changed in order to account for holidays and weekends.