Research approval under section 35: conditional tax exemption requires annual research return and audited accounts submission. M/s Aravind Medical Research Foundation is approved as an Association for tax treatment of research expenditure under clause (ii) of sub section (1) of section 35, subject to conditions: furnish an annual scientific research return to the Secretary, Department of Scientific & Industrial Research by 31 May; submit audited annual accounts and audited income & expenditure accounts for research activities to designated tax and DSIR authorities by 31 October each year and file the income tax return; the separate books requirement is not applicable to entities categorised as Association; apply in triplicate for renewal through tax authorities and send copies to DSIR.