Offshore Banking Unit deduction reporting requires unit details, income computation, foreign exchange exclusion, and accountant verification. Report for deduction in respect of income of Offshore Banking Units and Units of an International Financial Services Centre under section 147(4)(a) requires disclosure of assessee and unit particulars, supporting permissions, commencement details, and whether the unit was formed by splitting up, reconstruction, reorganisation, or transfer of an existing business in India where commencement is after 01.04.2026. The form also requires computation of gross income, foreign exchange exclusion, attributable expenses, and income eligible for deduction, followed by accountant verification.