<h1>Annual donor certificate for scientific research requires electronic FORM 16, separate from receipts and subject to deduction conditions.</h1> Prescribed undertakings or institutions covered by section 45(3) must issue FORM 16 as an annual certificate to donors for sums received for scientific research. The certificate is issued once for the relevant tax year, on or before 31 May immediately following that year, and records the aggregate donation, donor particulars, the institution's approval details, and the relevant clause of section 45(3). FORM 16 is distinct from FORM 15, may be corrected or revised, and does not by itself guarantee deduction to the donor.