To maximise your tax deductions in Australia, claim home office expenses if you work from home, including a portion of heating, cooling, and depreciation of office equipment. Deduct study costs related to your current job, such as course fees and textbooks, if they enhance your skills. Keep receipts for all work-related expenses, and electronic copies are acceptable. Deduct expenses incurred in earning your income, like travel and tools, but avoid overstating your claims. Stay organised with your documents and consider consulting a tax professional to ensure optimal deductions and accuracy in your tax return.