As per Section 73 & 74 of CGST : The proper Officer may serve SCN to person due to any of following reasons 1. Tax not paid/short paid 2. Tax Erroneously refunded 3. Input credit wrongly availed or utilized.
The only difference between 73 & 74 is Section 74 invokes when the taxpayer by means of FRAUD ,MISTATEMNT, SUPPRESSION BY WILFUL indulge any of above mentioned condition. And Section 73 is applies to NON FRAUD cases .
Procedure : In term of Rule 142 of CGST Act The proper Officer Issue Notice in Form DRC 01 mentioned Tax Period, FY & Taxes & penalty therein .
SCN in DRC 01 can be issue in case of Bona fide defaulter (Non fraud) with in 2 years + 9 months from the due date of file annual Return & in case of Mala-fide defaulter (Fraud) it's 4year + 6 months .
for more details kindly refer Rule 142 in this regard