Charitable purpose clarified: statutory public bodies generally exempt; commercial receipts taxed under quantitative proviso, with annual scrutiny required.
The judgement narrows the scope of charitable purpose under Section 2(15) by treating statutory public utility bodies as generally exempt while excluding income from commercial activities beyond core regulatory or public-interest functions. Trade-promotion and non-statutory bodies may qualify if charges are nominal, but ancillary fee-generating services and high-fee providers produce taxable commercial receipts. Private trusts' advertisement income is commercial. Assessing authorities must perform yearly scrutiny and apply the proviso's quantitative limits to determine exemption eligibility.