This article discusses the assessable income and deductions for BagCo, a resident Australian company, and Brenda, an Australian resident taxpayer working as a professional accountant. It covers the rules and applications of Section 6(1), Section 8-1, Section 40-65, and more. BagCo can claim deductions for expenses incurred during normal business activities, while Brenda can claim expenses for increasing her professional efficiency or learning new skills.