Gst Dealer sale turnover compared previous years compared provision in gst act

sir, A Gst registered dealer regular scheme registred in gst act. April to septemer-24 sales turnover declared in gstsr3b rs:60 lacs previous years april to septemer -23 sales turnover declared in gstsr3brs:80 lacs .if gst officer visited dealer prinicipal palace sale turnover campared turnover shortfall reasons asked. Query: Gst officer turnover compared reasons asked provisions in gst act.

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