Valid C forms and statutory verification are essential for concessional CST; purchaser confirmations alone cannot cure material defects.

Concessional CST rate on inter-State sales is available only on valid C forms containing the required particulars and matching the statutory triplicate scheme. Minor defects may be curable, but material erasures, substitutions or pasted corrections made by the selling dealer, or supported only by purchaser confirmation letters, do not satisfy section 8(4)(a) read with rule 12(1). The forms must remain internally consistent, attested by the issuing dealer where corrected, and capable of verification against the retained triplicate copy. On these facts, the defective C forms were rejected, though a limited opportunity remained to produce duly attested corrected forms and payment details.

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Issues: Whether defective C forms with erasures, substitutions and pasted corrections could be accepted for granting concessional rate of tax on inter-State sales, and whether purchasers' confirmation letters by themselves could cure the defects.

Analysis: Under section 8(4)(a) of the Central Sales Tax Act, 1956 read with rule 12(1) of the Central Sales Tax (Registration and Turnover) Rules, concessional rate is available only on valid C forms containing the required particulars of the inter-State sales. Minor or curable defects may be corrected, but the forms must remain consistent with the declarations issued by the buyer in triplicate and capable of verification by the authorities. Corrections or substitutions made by the selling dealer in the retained copies, or supported only by purchaser confirmation letters, do not satisfy the statutory requirement. Where the entries show advance blank forms filled up by the seller, or material alterations are made without attestation by the issuing dealer and verification against the triplicate copy, the defects are not merely curable and the forms cannot be accepted as valid.

Conclusion: The defective C forms were not automatically entitled to acceptance, and purchaser confirmation letters alone were insufficient to cure the defects; the rejection of concessional rate was upheld, though the assessee was given a limited further opportunity to produce duly attested corrected forms and payment details.

Final Conclusion: The assessee failed on the substantive challenge to the rejection of the C forms, but was afforded a conditional opportunity to seek concessional treatment upon strict compliance with the prescribed verification procedure.

Ratio Decidendi: C forms must be valid, internally consistent, and capable of verification in the statutory triplicate scheme, and material corrections or substitutions are acceptable only when attested by the issuing dealer and verified through the issuing State's assessment machinery.

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