What are the due dates for my withholding returns?
The withholding quarterly returns are due by the last day of the month following the end of the quarter. FORM QUARTER DUE DATE WH-1605 1st (Jan-Feb-Mar) due by Apr 30th WH-1605 2nd (Apr-May-Jun) due by Jul 31st WH-1605 3rd (Jul-Aug-Sep) due by Oct 31st WH-1606 4TH (Oct-Nov-Dec) / Annual (Jan-Dec) last day of February The withholding 4th quarter/annual return is due by the last day of February.