All tax deductions for January 2018 need to be deposited latest by 7th February, 2018. Make sure to do the needful on time to avoid interest. To understand the details/ calculations for late payment interest click on the links below.
Calculation of Late Payment Interest
Interest on Late Payment of TDS
Last date for issue of TDS Certificates for FY:17-18, Quarter 3 is 15th February, 2018