When a taxpayer switches from the Composition Scheme to the Regular Scheme during a financial year, they are still required to file Form GSTR-4 for the entire financial year.
In GSTR-4, you report the turnover and details only for the period during which you were under the Composition Scheme.
Key Points for Filing:
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Scope of GSTR-4: GSTR-4 is mandatory for any taxpayer who was under the Composition Scheme for any part of the financial year. It covers your activity for the specific period you were registered as a composition dealer.
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What to Include: You should report the aggregate turnover, outward supplies, and inward supplies (including those subject to Reverse Charge) strictly for the period you operated under the Composition Scheme.
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What to Exclude: You should not include the turnover or transactions for the period when you were a regular taxpayer in GSTR-4. For that period (the regular scheme phase), you must file the regular returns (GSTR-1 and GSTR-3B) as applicable to a normal taxpayer.
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Consolidation: GSTR-4 will effectively consolidate the details of the quarterly CMP-08 statements filed for the period you were in the Composition Scheme.
Summary
To resolve your reporting, only mention the turnover and details for the period you were a composition dealer (October to December in your case). The turnover from the period you were a regular taxpayer (January to March) should be reported through your regular GST returns (GSTR-1 and GSTR-3B) and not in the GSTR-4.