Transitional input tax credit rules govern refunds, supplementary invoices and recovery treatment under transition to GST.

Section 142 sets transitional GST rules: returned goods taxed under prior law may yield refunds if returned within the prescribed period and identified; price revisions under pre appointed day contracts permit supplementary invoices or credit notes to adjust tax liability provided recipients reduce input tax credit accordingly; refund claims and appellate or assessment proceedings initiated under the existing law are to be disposed of under that law with recoverable amounts treated as arrears under this Act and not admissible as input tax credit when recovered, while refundable sums must be paid in cash under the earlier law.

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