A receipt is not automatically a tax deduction. For deductible small business expenses, the key question is whether the cost was genuinely incurred in earning your business income – and whether you can substantiate the claim if asked. Getting this right reduces taxable income appropriately, while helping you avoid the stress of overclaiming, missed deductions or untidy records at tax time.
The basic test for deductible business expenses
In practical terms, a business expense is usually deductible when it has a clear connection to running your business or producing assessable income. It must not be private, domestic or capital in nature, unless a specific tax rule allows a deduction.
The connection needs to be real, not just convenient. A mobile plan used to take customer calls may be partly deductible. A family holiday with one client meeting is not transformed into a business trip simply because work was discussed. Where an expense has both business and private use, only the business portion can be claimed.
The timing also matters. Most small businesses claim expenses when they incur them, although this can depend on the business structure and accounting method used. Some costs must be deducted over time rather than immediately, and some deductions are only available once payment has actually been made.
Common deductible small business expenses
Every business is different, but the following costs are commonly deductible where they relate to business operations and are correctly recorded.
Day-to-day operating costs
Rent for business premises, utilities, business insurance, stationery, software subscriptions, merchant fees, bank charges and advertising are generally deductible. This may include website hosting, bookkeeping software, phone systems, printing, professional memberships and industry publications where they support your work.
Marketing costs can include online advertising, signage, brochures and sponsorships that promote the business. Keep records showing the business purpose, particularly where a sponsorship arrangement includes hospitality or personal benefits as well as advertising.
Employees, contractors and professional support
Wages, salaries, bonuses, commissions and allowances are generally deductible where they are paid for work in the business. Employer superannuation contributions are generally deductible only when they have been paid, so it is worth checking payment dates carefully near 30 June.
Payments to contractors may also be deductible, but the arrangement must be handled correctly. Depending on the nature of the work, you may have PAYG withholding, superannuation or reporting obligations. Calling someone a contractor does not, by itself, settle their tax or workplace status.
Fees paid for bookkeeping, accounting, legal advice, payroll administration and business consulting are commonly deductible when they relate to managing or operating the business. Costs connected with buying or selling a business asset, however, may be capital costs and need different treatment.
Vehicle and travel costs
A vehicle used to visit clients, collect supplies, travel between work sites or attend business meetings can create deductible expenses. This may include fuel, servicing, registration, insurance, repairs, lease costs and depreciation, depending on the vehicle and the calculation method used.
The daily trip between home and a regular workplace is usually private, even if you make work calls along the way. Travel between business locations, from your office to a client, or from a home-based business to a temporary work site may be different. Accurate diaries, logbooks and odometer records are especially useful where vehicle use is mixed.
Business travel can include airfares, accommodation, parking, tolls and meals when you travel overnight for work. The expense still needs to be reasonable and work-related. Extending a business trip for private sightseeing means the private portion must be excluded.
Working from home
Many sole traders and business owners perform at least some work from home. Deductible running expenses may include the business portion of electricity, internet, mobile use, cleaning and consumables. If an area of the home is genuinely set aside and used as a place of business, some occupancy expenses may be relevant as well.
This area is more nuanced than it first appears. The right method depends on your circumstances, the nature of the space and the records available. A simple estimate is rarely enough. Keep invoices and a reasonable basis for apportioning costs, such as floor area, hours worked or usage data.
Expenses that need extra care
Some costs are regularly misunderstood because they can feel related to the business without meeting the tax rules.
Entertainment is a common example. Meals with clients, staff celebrations, tickets to sporting events and similar hospitality expenses are often not deductible, even when they have a business purpose. In many cases, GST credits are also not available. There are limited exceptions, so ask for advice before treating entertainment as a standard business cost.
Fines and penalties are not deductible. That includes parking fines, speeding fines and penalties imposed for breaking the law. Income tax payments are not deductible either, although the cost of obtaining advice about your tax affairs may be.
Clothing is another area where context matters. A compulsory uniform with a business logo, protective clothing and occupation-specific clothing may be deductible. Ordinary clothing, even if purchased specifically to look professional at work, is generally private.
Training can be deductible when it maintains or improves skills used in your existing business. Training to enter a new field, start a new business activity or gain a new qualification may be treated differently. The detail matters.
Capital purchases are treated differently
Buying a laptop, tools, machinery, office furniture or business vehicle is not always an immediate deduction. These items can provide a benefit over more than one year, which may make them capital assets. Their cost is generally claimed over time through depreciation, subject to any small business concessions or temporary write-off measures available for the relevant year.
The rules and thresholds for immediate asset write-offs can change. Before purchasing an asset primarily for a tax outcome, consider cash flow, business need and the rules that apply to your entity and purchase date. A deduction is helpful, but it does not make an unnecessary purchase free.
Repairs can also be difficult to classify. Fixing normal wear and tear may be deductible, while an improvement that substantially upgrades an asset may need to be treated as capital expenditure.
GST changes the amount you claim
If your business is registered for GST and entitled to claim an input tax credit, your income tax deduction is generally based on the cost excluding GST. For example, if you buy eligible business supplies for $110 including GST and claim the $10 GST credit in your BAS, the income tax deduction is generally $100.
If you are not registered for GST, or you cannot claim a GST credit for that purchase, the GST-inclusive amount may form part of the deduction. This is one reason your bookkeeping, BAS reporting and tax return should agree with each other.
Records make the deduction defensible
Good recordkeeping is not just an administrative task. It is what supports your position if the ATO asks how an expense was calculated or why it was business-related. Keep tax invoices, receipts, bank statements, contracts, logbooks, diaries and notes explaining mixed-use costs. Digital copies are generally acceptable if they are clear, complete and easy to retrieve.
Records should generally be kept for at least five years. Separating business transactions from personal spending through a dedicated business bank account and card makes this considerably easier. Regular bookkeeping also means you can identify missing documents while the details are still fresh.
Make decisions with the full picture
A legitimate deduction can reduce taxable income, but it should never be the sole reason for spending money. The better question is whether the cost will help your business operate, serve customers or grow in a sustainable way, with the tax treatment understood from the beginning.
If you are unsure whether an expense is deductible, ask before lodging rather than trying to correct an avoidable error later. A registered tax agent can review the facts, explain the practical options and help you keep claims accurate, reasonable and well supported. At Hire An Accountant, that means turning the paperwork into clear next steps, so your business records work for you rather than becoming another source of pressure.
