Filing a GSTR-4 return is a final, non-revisable process once submitted on the GST portal. Because GSTR-4 cannot be revised, you cannot go back and change the incorrect data directly in that specific filing.
Why this happened
The "negative tax liability" arises because your quarterly CMP-08 filings (where you already paid the tax) were auto-populated into Table 5 of your GSTR-4. However, because Table 6 (which requires manual entry of the year's total sales) was left as zero, the portal incorrectly assumed you had no outward supply. Consequently, it treated the tax you had already paid as "excess" or "negative liability."
Potential Remedies
While there is no "edit" button for a filed GSTR-4, you can manage the situation by following these professional recommendations often suggested by tax experts and GST advisories:
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Understand the Negative Liability Statement: The GST portal tracks this "excess" tax in a Negative Liability Statement. This balance is essentially a credit entry that the portal may try to auto-adjust against future liabilities.
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Voluntary Payment via DRC-03: A common practice to rectify such discrepancies is to pay the tax liability that should have been reported in Table 6 using Form GST DRC-03.
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When creating the DRC-03, choose the cause of payment as "Annual Return" or "Voluntary Payment" (often under Section 73).
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This action signals to the department that you have corrected your tax liability independently.
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Consult a Professional/Jurisdictional Officer: Since this involves a past financial year (FY 2019-20), it is highly advisable to consult with a Chartered Accountant or a GST practitioner. They can help you draft a formal letter to your jurisdictional GST officer explaining the clerical error. Providing documentation (such as your sales register and proof of tax paid via CMP-08) is crucial.
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Do Not Assume Automatic Adjustment: While the portal may attempt to use the negative balance for future periods, this can sometimes lead to further reconciliation issues during audits. Clearing the matter via DRC-03 or official correspondence is the safer route for "audit readiness."
Summary of Actions
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Do not attempt to "fix" it in current returns without professional guidance, as it may cause further mismatches.
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Verify your Negative Liability Statement on the portal under Services > Ledgers > Negative Liability Statement.
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Keep your records ready: Maintain your sales register and proof of payment (CMP-08 challans) for the relevant period.
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Speak to your tax consultant about filing a DRC-03 to regularize the tax payment for that financial year.