16 October 2017
IF TAX LIABILITY IS MISTAKENLY EXCESS SHOWN IN REVERSE CHARGE COLUMN AT SERIAL NO.D OF TABLE 3.1 OF GSTR 3B BUT THE SAME HAS NOT BEEN DEPOSITED AND RETURN HAS BEEN JUST SUBMITTED BUT NOT FILED- WHETHER INTEREST WOULD BE CHARGED AUTOMATICALLY IN TABLE NO.6.1 BY THE SOFTWARE IF SUCH EXCESS AMOUNT IS NOT DEPOSITED BEFORE 20TH OR DUE DATE .
31 October 2026
GSTR-3 never became operational, so nothing is calculated there; interest u/s 50(1) arises only on genuine tax paid late (on the net cash portion), so excess RCM declared by mistake carries no interest, and since RCM must be paid in cash, any excess actually paid can be adjusted in a later GSTR-3B or claimed as refund of excess tax paid.