31st May – last date of filing TDS Returns for FY: 2017-18, Quarter 4 (Jan – Mar)
30th May – last date for TCS Certificates for FY: 2017-18, Quarter 4 (Jan – Mar)
Basic provisions relating to due date for payment of TDS
Sections under which interest for various delays/ defaults need to be paid
Filing of TDS Returns for the quarter ended March 2018 (FY:2017-18 Quarter 4) is already under way since 1st April.