S. 40(a)(ia) : Amounts not deductible – Deduction at source -Insertion of second proviso by the Finance Act , 2012 , with effect from Apri1, 2003, is declaratory and curative and applicable retrospectively with effect from 1-4-2005 — Payee offering to tax sum received in its return — No disallowance can be made.[S. 37(1), 201 (1)]