GST exemption applies to effluent and waste-treatment services...

GST exemption applies to effluent and waste-treatment services supplied by a section 12AA-registered entity where those activities constitute charitable preservation of the environment. The specific nil-rate exemption prevails over the taxable entry for sewage and waste collection, treatment and disposal services, particularly where charitable status has been previously determined. Extended demand proceedings require strict proof of fraud, wilful misstatement, or deliberate suppression of material facts with intent to evade tax; a failure to declare tax liability alone is insufficient. A subsequently discontinued exemption claim and later tax payment do not establish prior intent to evade. The show-cause notice was quashed because the exemption was available and the conditions for invoking the extended-demand provision were absent.