Reduced GST interest rates for delayed returns in March and April 2021 with staged lower rates by turnover and filing category. The notification amends the Union Territory GST interest provisions for March and April 2021 by inserting staged interest slabs tied to aggregate turnover and return-filing category: taxpayers with turnover above rupees five crores pay nine per cent for the first fifteen days from the due date and eighteen per cent thereafter; taxpayers with turnover up to rupees five crores and specified return-filing categories pay nil for the first fifteen days, nine per cent for the next fifteen days, and eighteen per cent thereafter. The amendment is effective from 18 April 2021.