Our firm engaged in the business of manufacturing at SIDCO, Bari Brahmana, Jammu. We are enjoying benefit of Excise Duty exemption (First paid than refund). At the time of computation of taxable income, we considered the amount of Excise Duty refund as a business income and avail deduction u/s 80IB. Kindly suggest the Excise Duty is business income or not, if yes, is allowable in u/s 80IB.