https://www.taxtmi.com/caselaws?id=39996 Waiver of sales tax exemption failed because intentional relinquishment of a known right was neither pleaded nor proved, and the record did not show that the assessee knowingly abandoned its claim by accepting concessional rates. Promissory estoppel applied because an authorised government assurance of exemption was clear, within statutory power, and intended to be acted upon; the assessee relied on it by altering its position through borrowing funds, purchasing machinery, and setting up the factory. Mere change of policy or executive necessity could not defeat the promise absent overriding public interest or illegality. The promised exemption was therefore enforceable against the State, with consequential refund relief. en-us Tue, 12 Dec 1978 00:00:00 +0530 Fri, 11 Jul 2025 11:11:00 +0530 TaxTMI RSS Generator https://www.taxtmi.com/caselaws?id=39996 Waiver of sales tax exemption failed because intentional relinquishment of a known right was neither pleaded nor proved, and the record did not show that the assessee knowingly abandoned its claim by accepting concessional rates. Promissory estoppel applied because an authorised government assurance of exemption was clear, within statutory power, and intended to be acted upon; the assessee relied on it by altering its position through borrowing funds, purchasing machinery, and setting up the factory. Mere change of policy or executive necessity could not defeat the promise absent overriding public interest or illegality. The promised exemption was therefore enforceable against the State, with consequential refund relief. Case-Laws VAT / Sales Tax Tue, 12 Dec 1978 00:00:00 +0530 https://www.taxtmi.com/caselaws?id=39996