Circular No. 601-Income tax Reference is invited to Circular No. 581 dated 28-9-1990 issued by the Board in respect of prima facie adjustments under section 143(1)(a) and the scope of section 154. It was clarified in the said circular that where an evidence in support of a deduction claimed under section 43B, or in support of certain other exemptions and deductions, is required to be attached along with the return of income, but is not so attached, the said deduction/exemption shall be disallowed under section 143(1)(a)
