The document provides an overview of general deductions under section 11(a) of the Income Tax Act in South Africa. It defines key terms like "carrying on a trade" and outlines the general deduction formula. It also discusses specific provisions around pre-trade expenditure under section 11A, capital vs revenue expenditure, and prohibited deductions under section 23. The presentation aims to help understand the general deduction formula and how to apply disallowed expenditure provisions.