Running your own business means keeping an eye on both the work and the paperwork. Tracking expenses as you go can help you identify costs that may be deductible and provide evidence when preparing your Australian tax return. The key is to record what you bought, when you bought it, and how it relates to earning business income. Here are common expense categories to review, along with practical ways to keep your records clear and useful.
Common business expenses
You may be able to claim eligible costs directly related to earning your business income. Common examples include stock and materials, business insurance, advertising, accounting or legal services, bank fees, and work-related subscriptions. Keep invoices and receipts, and note the business purpose where it is not obvious. A payment appearing on a bank statement can show that money left your account, but it may not explain what you bought or why it was needed.
Tools, equipment, computers, and other assets may be treated differently from everyday running costs. Depending on the item and applicable tax rules, you may need to claim its cost over time rather than all at once. Keep the purchase documents and details such as the date it was first used for work. Check current Australian Taxation Office guidance or ask a registered tax professional how a particular asset should be treated.
Separate business and private use
Some costs serve both business and personal purposes. A mobile phone, home internet connection, vehicle, or home workspace may fall into this category. You generally need to identify and claim only the business-use portion, using a reasonable method supported by records. For example, keep a log or usage notes that show how you worked out the business share instead of estimating from memory at tax time.
Avoid claiming a cost just because you paid for it through a business account. Private expenses are not business deductions, and mixed-use purchases need a clear split. If your circumstances change, update your method and records. For vehicle claims, check which method applies to your situation and keep the required evidence, such as a logbook or records of business trips, under current ATO rules.
Build a useful record system
Save tax invoices, receipts, contracts, and other documents that support your claims. For each expense, record the date, supplier, amount, what you purchased, and its business purpose. Digital copies can make documents easier to find, but make sure scans and photos are legible and backed up. A simple folder structure by financial year and expense category can stop small receipts from becoming a last-minute scavenger hunt.
Reconcile your records regularly against bank and card statements. This helps you spot missing receipts, duplicate entries, and transactions that need an explanation. Keep business and personal transactions separate where practical, and record cash purchases promptly. Australian business tax records generally need to be kept for five years, though exceptions can apply; confirm the retention period for your situation using current ATO guidance.
Review before lodging
Before preparing your return, compare your expense list with your supporting documents and check that each claim relates to your business. Look for amounts that include GST, private portions, reimbursements, or refunds so you do not overstate a cost. If you are registered for GST, make sure your income tax and GST records are handled consistently and that you do not claim the same amount twice.
When a cost is unusual, shared between business and personal use, or connected to a major purchase, seek advice rather than guessing. Tax rules and eligibility depend on the details, and the ATO updates its guidance. Bright Ledger Tax can help Adelaide sole traders review their records and prepare for tax time; you can also check official ATO resources or speak with a registered tax professional.
Good expense records make it easier to identify eligible deductions, explain your calculations, and prepare an accurate return. Capture details when you spend, separate private use, and review your documents throughout the year. If you are unsure how a cost should be treated, get guidance before lodging so you can move ahead with clearer records.