Res judicata bars reopening a finally decided turnover issue in later tax revision proceedings

A revising authority could not reopen a turnover issue in a later departmental revision where the same question had already been finally adjudicated between the parties in the assessee's earlier revision. Although the statutory scheme allowed both the Commissioner and an aggrieved person to file revisions within limitation, the prior disposal of one revision did not extinguish the other party's timely revision right, and merger could not defeat it. However, once the turnover question was conclusively decided, res judicata barred reconsideration of that identical issue in subsequent quasi-judicial tax proceedings. The later contrary view was therefore unsustainable, and the assessee prevailed on the referred question.

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Issues: Whether the revising authority could, in a subsequent revision filed by the department, reopen and take a contrary view on a turnover issue that had already been finally decided in the assessee's earlier revision.

Analysis: The statutory scheme permitted both the Commissioner and an aggrieved person to file revisions within the prescribed limitation period, and it did not require one party to file its revision immediately upon the other party's filing. For that reason, the mere disposal of one revision did not destroy the statutory right of the other party to file a revision within time, and the theory of merger could not be applied to defeat that right. However, once the earlier revision had finally adjudicated the very question whether the turnover returned by the assessee should be accepted or the higher turnover fixed by the Sales Tax Officer should stand, that issue stood concluded between the parties. The general principle of res judicata, founded on finality in litigation, applied to bar reconsideration of the same issue in later proceedings between the same parties.

Conclusion: The revising authority was not entitled to reopen the turnover question in the department's subsequent revision and take a contrary view; the question was answered against the department and in favour of the assessee.

Final Conclusion: The reference was disposed of by holding that the earlier final decision on turnover bound the revising authority, and the assessee succeeded on the referred question.

Ratio Decidendi: A question finally decided between the same parties in an earlier revision cannot be reopened in a later revision on the same issue, and the principle of res judicata applies to quasi-judicial tax proceedings to secure finality.

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