Dividend distribution rules updated to expand deductible expenditures and redefine investment company, altering distributable income allocation. Amendments expand deductible categories to include certain business expenditures not previously deducted (bonuses, legal charges, specified disallowed items, and revenue expenditures not creating assets) and analogous expenditures incurred to earn non-business income; they redefine investment company to mean a company whose income mainly comprises income treated as unearned income, and adjust allocation and treatment rules where part of a company's income arises from specified business activities, deeming distributable dividends to be proportionate to the non-specified part of total income.