Deductibility of business expenditure limited: expenses that are illegal, for corporate social responsibility, or political advertisements disallowed. Expenditure wholly and exclusively for business or profession is allowable in computing business income, except capital or personal expenses and items excluded by Sections 30-36. Expenses incurred for purposes that are offences or prohibited by law, payments to compound offences or settle specified contraventions, and expenditures on corporate social responsibility activities are not deductible. Expenditure on advertisements in political party publications is also disallowed.