(10C) 1[ any amount received by an employee of-
(i) a public sector company; or
(ii) any other company; or
(iii) an authority established under a Central, State or Provincial Act; or
(iv) a local authority; 2[ or]
(v) 3[ a co- operative society,- or
(vi) a University established or incorporated by or under a Central, State or Provincial Act and an institution declared to be a University under section 3 of the University Grants Commission Act, 1956 4 (3 of 1956 ); or
(vii) an Indian Institute of Technology within the meaning of clause (g) of section 3 of the Institutes of Technology Act, 1961 5 (59 of 1961 ); or
(viii) such institute of management as the Central Government may, by notification in the Official Gazette, specify 6 in this behalf,] at the time of his voluntary retirement in accordance with any scheme or schemes of voluntary retirement, to the extent such amount does not exceed five lakh rupees: Provided that the schemes of the said companies or authorities 7 [ or societies or Universities or the Institutes referred to in sub- clauses (vii) and (viii)], as the case may be, governing the payment of such amount are framed in accordance with such guidelines (including inter alia criteria of
economic viability) as may be prescribed' and such schemes in relation to companies, referred to in sub- clause (ii) 2[ or co- operative societies referred to in sub- clause (v)] are approved by the Chief Commissioner or, as the case may be, Director- General in this behalf: Provided further that where exemption has been allowed to an employee under this clause for any assessment year, no exemption thereunder shall be allowed to him in relation to any other assessment year;]