Deduction for income remitted in convertible foreign exchange requires timely repatriation, possible extension, and prescribed certificate. Amendment provides a deduction equal to seventy-five per cent of income brought into India in convertible foreign exchange within six months of the previous year end, subject to possible extension by the Chief Commissioner or Commissioner where the assessee is unable to repatriate within that period for reasons beyond control. The deduction is conditional on furnishing a prescribed-form certificate with the return of income certifying the correct claim.