Deduction for expenditure on eligible projects requires approval and certificates; withdrawal converts receipts into taxable income. A deduction is available for expenditure on eligible projects paid to public sector companies, local authorities, or approved associations or institutions, or directly incurred by companies, subject to prescribed certificates being furnished with the return; the deduction is exclusive of other provisions, approvals or notifications may be withdrawn after opportunity to show cause and where withdrawn the payments or claimed deduction are deemed income of the recipient in the year of withdrawal and taxed at the maximum marginal rate.