Reasonable cause defeats penalty when a bona fide mistaken belief explains delayed return filing and failure to furnish an income estimate.

An honest and bona fide but mistaken belief, supported by surrounding facts, can constitute reasonable cause to avoid penalty for delayed return filing and for failure to furnish an income estimate. The Madras HC held that the assessee's illiteracy, entrustment of business affairs to a brother-in-law, and belief that the income belonged to that brother-in-law justified the default. On those facts, penalty under section 271(1)(a) for delayed filing was not leviable, and penalty under section 273(c) for non-furnishing of the estimate under section 212(3A) was also unsustainable. The penalties were therefore cancelled.

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Issues: (i) Whether penalty under section 271(1)(a) of the Income-tax Act, 1961 was exigible for delayed filing of the return despite the assessee's explanation of reasonable cause. (ii) Whether penalty under section 273(c) of the Income-tax Act, 1961 was exigible for failure to furnish the estimate of income under section 212(3A) of the Income-tax Act, 1961 despite the same explanation.

Issue (i): Whether penalty under section 271(1)(a) of the Income-tax Act, 1961 was exigible for delayed filing of the return despite the assessee's explanation of reasonable cause.

Analysis: The assessee's case was that he was illiterate, had entrusted the business affairs to his brother-in-law, and honestly believed that he had no legal obligation to file the return in his own name. That explanation was supported by the manner in which the assessment was ultimately made, namely by adding the income found in the brother-in-law's books. On those facts, the belief, though mistaken, amounted to reasonable cause for the default.

Conclusion: Penalty under section 271(1)(a) was not leviable and its cancellation was justified.

Issue (ii): Whether penalty under section 273(c) of the Income-tax Act, 1961 was exigible for failure to furnish the estimate of income under section 212(3A) of the Income-tax Act, 1961 despite the same explanation.

Analysis: The same factual basis governed the failure to furnish the estimate. The assessee's honest but erroneous belief that the business was ly being carried on by his brother-in-law and that he had no taxable income to estimate constituted reasonable cause for not furnishing the estimate within time.

Conclusion: Penalty under section 273(c) was not leviable and its cancellation was justified.

Final Conclusion: The reference was answered against the Revenue, and the penalties were held to be unsustainable on the ground of reasonable cause.

Ratio Decidendi: An honest and bona fide belief, if supported by the surrounding facts, can constitute reasonable cause sufficient to defeat penalty for delay in filing a return or for failure to furnish an income estimate.

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