R&D deduction: enhanced allowance for approved in house research tied to prescribed authority approval and cooperative audit agreement. Sub-section (2AB) allows companies manufacturing notified articles to claim an one and one-fourth times deduction for qualifying in house scientific research expenditure (excluding land or building costs) where the facility is approved by the prescribed authority. The deduction is exclusive of any other deduction for the same expenditure. Eligibility requires an agreement with the prescribed authority for cooperation and audit of facility accounts, and the prescribed authority must report approvals to the Director-General in the prescribed form and time.