1. Compounding is not automatically required.
Closure/dropping of proceedings under Section 74 does not by itself terminate a pending Section 132 prosecution. The two proceedings are legally independent. CBIC's prosecution guidelines specifically recognise that prosecution may continue even where adjudication was initiated separately. However, the same guidelines also state that where the assessee is exonerated on merits and the allegation itself is found unsustainable, criminal prosecution on the identical facts should not ordinarily continue. (CBIC GST)
Therefore, the exact wording of the Section 74 closure order is crucial.
If the order records a finding on merits that the alleged tax evasion/fraud/suppression or other ingredients are not established, the better course is:
File the certified Section 74 closure/adjudication order before the Magistrate.
Place on record DRC-03, payment proof and all relevant departmental communications.
Seek appropriate discharge/closure of the criminal proceedings, specifically demonstrating that the Department itself has finally rejected the factual foundation of the prosecution.
If the Magistrate cannot or does not terminate the prosecution on that basis, approach the jurisdictional High Court for quashing of the complaint/chargesheet.
I would not recommend filing a compounding application as the first step if the Department has exonerated the assessee on merits. Compounding under Section 138 is essentially a settlement mechanism and may involve payment of the prescribed compounding amount. It is better kept as an alternative if the merits-based challenge does not succeed.
Also, merely filing an affidavit of closure before the Magistrate will not automatically end the trial. A specific judicial order terminating the criminal proceedings would ordinarily be required.
Practical conclusion:
Merits-based closure under Section 74 seek termination/quashing of Section 132 prosecution first. Compounding under Section 138 is an alternative, not an automatic requirement.
The decisive document is the actual Section 74 closure order. If it contains clear findings of exoneration on merits, the case for quashing becomes substantially stronger.