Obligation to furnish information return: prescribed reporters must file returns or face treatment as not furnished after rectification window. Section 150 requires specified persons and entities who maintain records or transaction-related documents to furnish an information return in prescribed periods, times, forms and to prescribed authorities. Defective returns must be intimated and rectified within a 30-day period, extendable on application, failing which the return is treated as not furnished. If returns are not furnished, the authority may serve a notice requiring submission within a period not exceeding 90 days from service.