S. 194C : Deduction at source–Contractors–Sub-Contractor- Contractor has to deduct tax at source on payment made to their sub contractors – Where person fails to deduct tax at source on sum paid to resident or on sum credited to account of resident such person shall not be deemed to be assessee in default in respect of such tax if such resident has furnished his return of income u/s. 139. [S. 40(a)(ia), 139, 201]