Tax approval for research institutions conditions maintenance of separate research accounts, annual returns, audited accounts and timely renewal. Approval under section 35(1)(ii) is conferred on Neuro-Otological & Equilibriometric Society of India (All India Institute of Medical Sciences), New Delhi, as an 'Association' for scientific research purposes, effective from 18-9-1983 to 31-12-1986. The approval is conditional on maintaining a separate research account; filing annual research returns by 30 April; submitting audited annual accounts and balance sheet with copies to the Commissioner by 30 June; and timely application to the tax board for extension at least three months before expiry.