Corporate tax rate is 28%. Dividend income is exempt from tax ,section 10(1)k, thus no tax deductions will be allowed under section 11(a) as dividends is of a capital nature. So to get deductions for expenses you have to trade in shares to produce taxable income. Companies have various compliance cost and if every shareholder is not also a director the cost can increase quite a bit. Interest that you earn, if any, will be included in you taxable income, if it is above the R23 800 threshold. The interest that is paid by the company might not deductible, but one third may be capitalised to the cost of the share. Transferring shares will result in capital gains tax. Companies do not qualify for the capital gain exclusion of R30 000 pa. Death and taxes - keep it simple - every situation is unique - get professional advice.