GST interest on self-assessed return liabilities is discharged...

GST interest on self-assessed return liabilities is discharged only when the Electronic Cash Ledger is debited towards the identified liability; a sufficient unappropriated cash balance does not stop interest until belated GSTR-3B filing. The later Rule 88B(1) proviso excluding amounts credited by the due date and continuously retained in that ledger operates prospectively, not for earlier periods. Notice proceedings remain valid where the taxpayer received the demand basis and computation, gave detailed replies, and established no actual prejudice. Denial of a requested personal hearing breached section 75(4), but did not require remand where the record was complete, the remaining issue was legal, and no lost substantive opportunity was identified. Interest demands were sustained, subject to reconciliation to prevent double recovery; substantive refund claims failed.