Mistake of law refund claims fail where excise duty burden was passed on, though limitation ran from discovery of the mistake.

Refund suits for excise duty paid on blended yarn were held to be within limitation because Section 17(1)(c) of the Limitation Act postponed time until discovery of the mistake of law. However, the Mills were denied refund under Section 72 of the Contract Act and restitution principles because the duty burden had been passed on to buyers, so retaining the amount was not unjust and the Mills had not suffered the real loss. Section 64A of the Sale of Goods Act supported that result. The claim for interest also failed for want of contractual, statutory, or equitable basis, and because the principal refund claim did not survive.

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Issues: (i) Whether the suits for refund of excise duty on blended yarn were barred by limitation. (ii) Whether the Mills were entitled to refund of the excise duty paid under mistake of law. (iii) Whether the Mills were entitled to interest on the refund amount.

Issue (i): Whether the suits for refund of excise duty on blended yarn were barred by limitation.

Analysis: The applicable residual period was governed by Article 113 of the Limitation Act, 1963, but where the suit sought relief from the consequences of a mistake, Section 17(1)(c) postponed the running of limitation until discovery of the mistake or the point when it could with reasonable diligence have been discovered. The mistake was a mistake of law, and the discovery of that mistake was held to have occurred only when the prior declaration of invalidity was made. The suits having been filed within three years from that date, they were within time.

Conclusion: The limitation defence failed and the suits were not barred.

Issue (ii): Whether the Mills were entitled to refund of the excise duty paid under mistake of law.

Analysis: The claim was founded on Section 72 of the Indian Contract Act, 1872 and on the principle of restitution. The Court held that the term "mistake" in Section 72 includes mistake of law, but restitution is not automatic merely because payment was made under mistake. A claimant must show that retaining the money would be unjust and that the claimant has suffered loss or injury. Applying that test, the Court found that the excise duty had been passed on into the cost of the finished fabric and ultimately borne by the buyers. Since the Mills had not suffered the burden themselves, they were not the real losers and allowing refund would result in unjust enrichment. Section 64A of the Sale of Goods Act, 1930 reinforced that the buyer, not the seller, would be entitled to the benefit of remission or refund where the tax burden had been passed on.

Conclusion: The Mills were not entitled to refund of the excise duty.

Issue (iii): Whether the Mills were entitled to interest on the refund amount.

Analysis: The claim for interest was examined under Section 1 of the Interest Act, 1839 and on equitable principles. In the absence of a contractual basis, statutory entitlement, established equitable circumstances, or proof of the current rate from the date of demand, the claim could not be sustained. As the principal refund claim itself failed, the claim for interest also could not survive.

Conclusion: The Mills were not entitled to interest.

Final Conclusion: The refund suits failed on merits because the duty burden had been passed on and no recoverable loss to the Mills was established, though the claims were held to be within limitation.

Ratio Decidendi: A person claiming refund of tax or duty paid under mistake must establish not only the mistake but also that retention by the recipient would be unjust because the claimant has actually suffered the burden and has not passed it on.

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