This discussion clarifies that while there was no extension to the due dates for TDS/TCS payments for March 2020, a reduced interest rate of 9% per annum was applied to delayed payments made between 20th March and 30th June 2020. This lower rate replaced the standard 12% or 18% interest charges for these specific income tax levies.
Interest at a reduced rate of 9% p.a. shall be charged instead of 12% or 18% p.a. towards the delayed payment/deposit of the following income tax levies, made between 20th March 2020 and 30th June 2020. Note that there is no extension in the deadlines.