Applicability of section 13(1)(d): trusts with previous year starting on or after 1 4 1981 face 80G renewal denial if non-compliant. Where any previous year begins on or after 1-4-1981, the investment-deposit limitation will apply from the first assessment year relevant to that previous year and can cause loss of exemption if funds are held in modes other than those permitted; where the previous year begins before 1-4-1981, that limitation will not operate for assessment year 1982-83 and the trust will not lose exemption solely by reason of that provision. Commissioners may renew the recognition certificate where the limitation does not apply, but must not renew where the previous year begins on or after 1-4-1981 and the trust is non-compliant.