Prospective conclusiveness of tax assessments preserves challenge rights for pre-cutoff turnover, while later assessments remain final in prosecution.

Section 16A of the Madras General Sales Tax Act was upheld as valid because the Legislature could make an assessment after 1 January 1948 conclusive proof in criminal proceedings for non-payment of sales tax, especially where appellate and revisional remedies existed. However, the provision was construed prospectively: it did not, without clear words, remove an accused's right to challenge assessments based on turnover relating to the period before 1 January 1948. The accused could therefore dispute the legality and quantum of pre-1948 turnover assessments, while assessments for later turnover remained conclusive in the prosecution.

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Issues: (i) Whether Section 16A of the Madras General Sales Tax Act was ultra vires. (ii) Whether Section 16A barred an accused from challenging the validity of an assessment based on turnover relating to a period before 1st January, 1948.

Issue (i): Whether Section 16A of the Madras General Sales Tax Act was ultra vires.

Analysis: The provision made an assessment after 1st January, 1948 conclusive proof of its validity in a prosecution for non-payment of sales tax. The Court held that the Legislature was competent to enact such a special rule overriding the general criminal procedure, and that the existence of appellate and revisional remedies also negatived the contention that the provision was unreasonable or beyond legislative power.

Conclusion: Section 16A was held not to be ultra vires.

Issue (ii): Whether Section 16A barred an accused from challenging the validity of an assessment based on turnover relating to a period before 1st January, 1948.

Analysis: The Court held that the new provision could not be read as taking away, without clear words, the existing right to dispute assessments founded on turnover for the earlier period. The decisive factor was the period of the turnover on which the assessment rested, not merely the date of assessment or prosecution. Accordingly, where the assessment related to turnover before 1st January, 1948, the accused could still dispute both the legality and the quantum of that portion of the assessment.

Conclusion: Section 16A did not bar a challenge to assessments relating to turnover before 1st January, 1948, but it did bar such challenge in relation to turnover after that date.

Final Conclusion: The order was modified so that the petitioner could contest the assessment only to the extent it related to pre-1st January, 1948 turnover, while the assessment for later turnover remained conclusive in the criminal proceeding.

Ratio Decidendi: A statutory provision making an assessment conclusive in criminal proceedings operates prospectively unless clear language shows an intention to abrogate the pre-existing right to dispute assessments founded on earlier turnover.

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