Best judgment turnover estimates must rest on material, not guesswork; unsupported further additions for possible omission are invalid.

Best judgment assessment of turnover must remain reasonably linked to the material on record and cannot rest on pure guesswork or suspicion. Where seized account books and the resulting calculations have already been used to estimate suppressed sales, no further addition can be sustained for a mere possible omission unless some separate supporting material exists. In tax matters, if the authority itself remains in doubt after making the available estimates, that doubt must be resolved in favour of the taxpayer. The further additions for possible omission were therefore not supported by material and were not legally valid.

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Issues: Whether additions made to gross turnover on account of possible omission, over and above the suppressed sales already worked out from seized account books and estimated suppressed sales for unavailable periods, were legal and valid.

Analysis: Even in a best judgment assessment, the turnover must bear a reasonable relation to material on record and cannot rest on pure guesswork or mere suspicion. The seized account books and the resulting calculations had already exhausted the available material for estimating suppressed sales. After those additions, no further evidence or material remained to justify an additional estimate described only as possible omission. In tax matters, where the authority itself is in doubt, the benefit of that doubt must go to the taxpayer.

Conclusion: The further additions for possible omission were not supported by any material and were therefore not legally valid.

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