There is no extension for payment of March month TDS. Due date still remains at April 30, 2020. However, where TDS is paid after the due date, instead of existing penal interest rate of 1% p.m (12% p.a), a lower rate of 0.75%(9% p.a) will have to be paid.
However, TDS returns can be filed till June 30, 2020 without any late fees