Can You Actually Claim That? (What You Can & Can’t Deduct)
- 12 hours ago
- 14 min read
You’re looking at a receipt, a bank transaction, or a monthly bill and asking the same question most taxpayers ask at some point: can you claim that? The hard part isn’t finding a long list of possible deductions. It’s deciding whether a specific expense survives ATO scrutiny once private use, timing, and record keeping are taken into account.
For FY 2025–26, the safest way to approach deductions is to think like the ATO. Start with the connection to income. Then test whether any part is private, domestic, or capital in nature. Finally, ask whether you could prove the claim if the ATO reviewed it later. That process matters more than any checklist.
In practice, many taxpayers keep more receipts than they use, but still struggle to decide what is deductible. Baron Tax & Accounting regularly sees Brisbane clients who have legitimate expenses yet remain unsure how to apportion mixed-use costs or document them properly. That uncertainty often leads to either under-claiming or making claims that don’t hold up well on review.
Introduction
A deduction isn’t a reward for spending money. It’s a legal claim for an expense that has the required connection to earning assessable income. That sounds simple, but most mistakes happen in the grey area where a cost is partly work-related, partly personal, or where the paperwork doesn’t support the claim.
The common examples are familiar. A sole trader uses the same mobile phone for clients and family calls. An employee buys clothing that feels work-related but is still conventional clothing. A property owner pays for work on a rental and treats an improvement as a repair. Each situation turns on judgment, not just labels.
Australian deduction rules sit under the Income Tax Assessment Act 1997. The practical question is always the same. What was the expense for, who used it, and what records prove the business or income-earning part?
Practical rule: If you can’t clearly explain why an expense was incurred to earn income, it usually isn’t ready to claim.
The Three Golden Rules of Deductibility
Incurred in earning income
The first test is the most important. Under the ITAA 1997, an expense must be incurred in gaining or producing assessable income. That is the positive limb. In practical terms, there must be a real connection between what you spent and how you earn.
If you’re a sole trader electrician in Brisbane and you buy job-specific tools, the connection is usually clear. If you buy a general household item and later say it helps with work, the connection is weak. The ATO looks for a genuine nexus, not a broad story about being “generally prepared for business”.
This is why job relevance matters. A cost isn’t deductible just because it makes work easier. It has to be part of the income-earning activity itself.
Not private, domestic, or capital
The second test removes a large number of claims. Even if an expense has some work relevance, you can’t deduct the private, domestic, or capital part.
Private and domestic costs are the most common issue. Rent, groceries, standard clothing, commuting from home to a regular workplace, and family internet use usually sit in this zone unless a specific rule says otherwise.
Capital costs are different. They may still be claimable, but not as an immediate deduction under the general rule. If you improve a business asset or rental property, that often becomes a capital allowance or depreciation issue rather than a straight deduction.
A home office is a useful example. The ATO allows a fixed rate method, but claiming rent or mortgage interest is more limited and only works proportionally where there is a dedicated business space. The ATO says 1.2 million home office claims totalled $2.1 billion, and 15% were rejected due to inadequate substantiation (ATO ruling reference). The lesson isn’t that home office claims are risky by default. It’s that mixed-use expenses are often over-simplified.
Have a record
A technically deductible expense still fails if you can’t prove it. That is where many otherwise valid claims fall over.
The ATO expects records that show:
What was purchased
When it was incurred
How much was paid
Why it related to earning income
How any private use was excluded
For straightforward expenses, this may be a tax invoice or receipt. For mixed-use costs, you often need more than that. Diaries, logbooks, usage summaries, rosters, and floor-area calculations can all matter.
Think of substantiation as the difference between “I spent the money” and “I can support the deduction”. Those are not the same thing.
A good claim has three parts. Purpose, treatment, proof.
Common Deductions for Individuals and Sole Traders
The ATO reported that Australians claimed approximately $22.5 billion in work-related deductions, and common errors included conventional clothing and unsubstantiated mobile phone or internet expenses, where 75% private use apportionment is often considered standard (ATO taxation statistics). That single point explains a lot of failed claims. People often start with the whole bill, then try to justify it. The better method is to start with the private component and remove it first.
Work-related expenses
Not every expense connected to having a job is deductible.
A classic example is clothing. If a Brisbane office worker buys black shoes, a blazer, or plain trousers because their employer expects a professional appearance, that’s still usually conventional clothing. The expense may help them do their job, but it remains private in character.
On the other hand, work-specific protective items and tools can be different. If the item is directly tied to the work performed and not ordinary private wear or use, the deduction position is much stronger.
For sole traders, the same principle applies. A groundskeeper’s safety boots may have a stronger nexus than a smart-casual shirt worn to client meetings. The tax outcome follows the character of the item, not how often you wear it for work.
Home office costs
Home office claims often look simple but usually involve several layers.
If you work from home or run part of your business from home, the fixed rate method can cover items like energy, internet, phone, stationery, and depreciation where the ATO requirements are met. The problem isn’t usually the concept. It’s proving the hours and excluding private use.
For small business owners, claiming occupancy costs such as rent or mortgage interest is more limited. The key issue is whether there is a dedicated business space rather than a shared domestic area. A spare room used only for administration is very different from the kitchen table.
Here are some practical considerations:
Shared family area usually supports only limited running cost claims.
Dedicated business area may support a broader claim, subject to apportionment and records.
Whole-of-home expenses should never be claimed just because some work occurs at home.
Motor vehicle and travel
Car and travel claims are another area where taxpayers drift into weak assumptions.
Travel between home and a regular workplace is generally private. Travel between work locations, to client sites, or for business tasks may be deductible, depending on the facts. A Brisbane tradesperson who starts at one site, travels to a supplier, then moves to another job during the day has a much stronger deduction basis than someone driving from home to the same depot each morning.
The evidence matters as much as the reason for the trip. If your travel pattern is recurring and work-related, keep records that show where you went and why. For readers dealing with allowances and the limits of simplified records, the ATO-related discussion in this article on record-keeping exceptions for travel allowance expenses is useful background.
A common mistake is assuming that because a car is “mainly for work”, the claim can be broad and rough. The ATO doesn’t like rough percentages pulled from memory. It prefers usage evidence.
If your car, phone, or internet is used for both business and private purposes, the deduction usually turns on the quality of your apportionment, not the existence of the expense.
Mobile phone and internet
These are among the most over-claimed items because they feel obviously work-related. But most phone and internet services are mixed-use by default.
A sole trader might use one mobile for:
client calls
supplier messages
banking authentication
family contact
personal browsing
Only the income-earning portion is deductible. That means you need a reasonable basis for splitting the bill. In many reviews, the ATO challenges claims because taxpayers treat the whole monthly service as a business cost without clear evidence.
If you want a more defensible approach, review a sample period, identify business use, and apply that method consistently. The key is that the percentage must come from something objective, not a guess.
Self-education
Self-education can be deductible when it has a clear connection to your current income-earning activities. It is much weaker where the study is aimed at changing careers or entering a new field.
That distinction matters. A bookkeeper completing training that improves their existing work may have a stronger basis than someone studying for a qualification to move into an unrelated profession.
For sole traders, the same logic applies. Training that sharpens the services you already provide is easier to support than study that prepares you for a new business line you haven’t yet commenced.
What tends to work and what doesn’t
Here is the practical pattern seen in real files:
Usually stronger claims Job-specific tools: Direct connection to income is easier to show. Documented home office running costs: Stronger where hours and method are recorded. Client-site travel: Better where the purpose and route are clear. Current-role education: More supportable when it maintains or improves present income-earning skills.
Usually weaker claims Conventional clothing: Even if your employer expects it. Whole phone or internet bills: Especially where family use is obvious. General home costs: Without a dedicated business area and method. Courses for a future role: Weak nexus to current assessable income.
Key Deductions for Small Businesses and Investors
Small business deductions usually look more flexible than individual claims, but the same principles apply. The difference is that business owners face more decisions about timing, asset treatment, and mixed-purpose expenses.
General business operating costs
Ordinary operating costs can often be deductible if they are incurred in earning assessable income and are not capital, private, or domestic. Think rent for business premises, software subscriptions used in the business, bookkeeping fees, merchant charges, and business-use phone services.
The tension usually arises when a cost has a longer-term benefit. That can push it into capital treatment rather than immediate deduction treatment. Buying or improving an asset is not the same as paying a monthly operating bill.
Business owners also run into trouble when personal spending flows through the business account. A payment from the business bank account is not automatically a deductible business expense. The character of the expense still controls the tax outcome.
For newer operators, ABN registration can be handled directly through the Australian Business Register. Alternatively, some people use structured registration support where the application and setup steps are guided as part of a broader compliance process. Baron’s ABN registration information is one example of that type of structured pathway.
Car use in business
Business owners often use one vehicle for everything. That’s workable, but only if the business-use percentage is grounded in records.
The most reliable claims are built from travel evidence rather than memory. Where vehicle usage is material, a proper method usually matters more than trying to maximise the percentage. For a practical explanation of how supporting records work, this guide to your car logbook for the ATO is a useful reference point.
Rental property deductions
Property investors face a different set of judgement calls. The big one is the line between a repair and an improvement.
The ATO says investment property deductions reached $12.8 billion, and 22% of audited claims were amended because capital improvements were incorrectly treated as immediately deductible repairs (ATO rental expense guidance). That is one of the clearest examples of why labels matter less than substance.
A repair usually restores something to its previous condition. An improvement makes it better, replaces it in a way that upgrades the asset, or forms part of a larger capital project. Replacing a few damaged sections may be a repair. Rebuilding or upgrading the whole item often points toward capital treatment.
This comes up often with Brisbane rentals after storm damage, leaks, and urgent maintenance. The fact that money was spent to make the property rentable again does not automatically make it a repair for tax purposes.
Negative gearing and availability for rent
Negative gearing allows rental losses to be offset against other income where the rules are met. But the claim can fail if the property is not offered for rent, or if parts of the expense profile are private.
That issue is particularly important for short-term rentals and situations where owners block out personal use. If the property is effectively being held for mixed private and rental purposes, the deductions need careful review.
Super contributions for business owners
For sole traders and some business owners, deductible super contributions can be part of a tax planning approach, but they require care. The concessional cap is $30,000, and the verified data also notes that these caps are changing, carry-forward rules are complex, and Division 293 tax adds an extra 15% tax for high-income earners. The ATO also notes that many individuals overpay due to miscalculations in this area.
This is one of the areas where self-service can still work, but many taxpayers choose review support because the consequences of an error aren’t always obvious when the contribution is made.
For broader reading on the topic, this overview of small business tax deductions gives a general business context alongside the ATO rules discussed here.
Substantiation The Art of Keeping Good Records
Good deduction decisions start when the expense is incurred, not when the tax return is prepared. If the record is weak at the time of purchase, it rarely gets better months later.
Digital records help, but they don’t solve everything on their own. A bank statement proves payment. It usually doesn’t prove deductibility. You still need enough context to show what the expense was for and how much of it related to income-earning activity.
A useful discipline is to keep three layers of evidence:
Primary record such as receipt, invoice, or contract
Usage evidence such as diary, logbook, work calendar, or floor-area calculation
Explanation in plain language, recorded close to the time
Some taxpayers track everything through myGov, accounting software, cloud folders, or expense apps. Others use a spreadsheet and scanned receipts. Both can work if the records are complete.
ATO substantiation requirements at a glance
Expense Type / Value | Required Records | Example |
|---|---|---|
General expense under the receipt threshold | Clear evidence of the expense and its work or business purpose. A receipt is still preferred. | A small work-related stationery purchase supported by invoice and business note. |
Expense over $300 | Receipt or invoice should be retained. The verified ATO rules note that expenses over $300 require receipts. | A work tool purchase with tax invoice and payment record. |
Car expenses | A logbook or other usage records are usually needed where business and private use are mixed. | Sole trader vehicle used for client visits and family errands. |
Home office claims | Diary of hours, bills, and working papers showing the method used. | Consultant working from a dedicated room at home. |
Phone and internet | Itemised bills or usage-based records showing the business-use percentage. | Monthly mobile bill apportioned between client and private use. |
Rental property costs | Invoices, statements, and records showing whether work was a repair or an improvement. | Plumber invoice compared with larger renovation documents. |
Poor records create two problems. First, legitimate deductions may be lost. Second, weak records can trigger broader review of other claims in the same return.
For taxpayers who want a simple checklist, Baron’s article on 8 essential records you need to keep ATO compliant in 2026 is a practical records summary.
Keep the evidence that explains the claim, not just the evidence that shows money left your account.
Common Mistakes and ATO Red Flags
The biggest deduction mistakes usually come from assumptions that feel commercially sensible but don’t match tax law.
Claiming the whole mixed-use expense
Phone, internet, motor vehicle, and home costs are the main examples. If private use exists, it must be removed. The ATO is especially alert to claims that treat a personal asset as though it were fully business-related.
Confusing repairs with improvements
This issue appears often in rental and business premises claims. The ATO position is clear. Negative gearing allows rental losses to be offset against other income, but the ATO scrutinises claims where a property is not properly available for rent. Deductions for repairs are permitted under s 25-10 of the ITAA 1997, but capital improvements must be depreciated (ATO ruling on rental property issues).
If the work gives the property something new, better, or more enduring, stop and review the treatment before claiming it immediately.
Treating private expenditure as business culture or networking
Entertainment is one of the most misunderstood areas. A meal with a client may feel business-related in an ordinary sense but still fail as a deduction depending on the rules and context. If you deal with staff functions, gifts, or hospitality, the distinctions outlined in entertainment expenses in Australia including client meals, wine, gifts, and staff dinner are worth reviewing carefully.
Overstating work-from-home claims
Work-from-home errors usually come from inflated hours, weak diaries, or broad claims over household costs without a proper method. The expense can be real and still be overstated.
In more complex situations, some individuals and business owners choose to have their return reviewed by a registered tax agent before lodgement to check apportionment and substantiation.
FAQs What You Can and Can’t Deduct
Can I claim travel from home to my regular workplace
Usually no. Travel from home to a regular workplace is generally private in nature. Travel between work locations or to client sites can be different if there is a direct connection to earning income.
Can I claim a uniform with a logo
It depends on the clothing and the facts. A work-specific uniform is different from conventional clothing, even if the employer expects you to wear it. If it remains ordinary clothing in substance, the claim is weak.
Can I claim childcare because I need it to work
Needing childcare so you can work doesn’t usually make the fees deductible. The expense is generally private or domestic in nature, even where it is necessary for you to earn income.
Are donations to all charities deductible
No. A payment must satisfy the tax rules for deductible gifts. A payment to an organisation that is not recognised for deductible gift purposes won’t automatically qualify, and some fundraising purchases are not treated the same way as gifts.
Can I claim self-education for a new career
Usually not if the study is directed toward entering a new field. Self-education is generally stronger where it maintains or improves skills used in your current income-earning activities.
Can I claim super contributions as a deduction
Potentially, yes, but the rules can be technical. The ATO notes that concessional superannuation contribution caps are set to rise, carry-forward provisions are complex, and Division 293 tax adds an extra 15% tax for high-income earners, with many taxpayers overpaying due to calculation errors (ATO contribution caps guidance). This is one of the clearest examples where a deduction can be available but still mishandled.
Should I lodge myself or use a registered tax agent
Both are valid options. If your affairs are straightforward and your records are organised, self-lodgement through official platforms may be suitable. If you have rental property, mixed-use expenses, business activity, or super contribution issues, a professional review can help you apply the law more accurately.
Summary Key Points for Compliant Deductions
A strong deduction claim usually passes three checks. It was incurred in earning assessable income. It is not private, domestic, or capital to the extent claimed. It is supported by records.
The main risk areas are:
Apportionment of mixed-use expenses such as phone, internet, car, and home office costs
Substantiation where the receipt exists but the work-related purpose is unclear
Capital versus repair treatment for property and business assets
Availability for rent issues for property investors
For taxpayers in Brisbane, local operating patterns often make mixed-use claims more common. Home-based work, travel between sites, and rental maintenance are practical examples. The tax result depends less on the suburb and more on the quality of the evidence and the accuracy of the treatment.
Real-World Accounting Observation
In Brisbane, many taxpayers are diligent about saving invoices but less confident when they need to calculate a business-use percentage. The uncertainty usually centres on mobile phones, internet, and home office costs, where the expense is real but the deductible portion needs a defensible method.
ASCII Diagram Apportioning an Expense
A simple apportionment model looks like this:
Total monthly mobile bill
|
v
Review itemised usage or diary sample
|
v
Separate business use from private use
|
+--> Business calls, client texts, work data
|
+--> Private calls, family messages, personal browsing
|
v
Apply reasonable business-use percentage
|
v
Claim only the business portionIf the underlying percentage is weak, the final deduction is weak. The arithmetic can be correct while the method is still not acceptable.
How to Claim Your Deductions
Most individuals claim deductions when lodging their income tax return. One pathway is self-service through ATO online services using myGov. That can work well where the affairs are simple and the records are already organised.
The alternative is to use a structured preparation or review process. Some individuals and businesses use online lodgement support or a registered tax agent where records, apportionment, and claim categories are checked before submission. For mixed-use expenses, even a narrow issue such as a mobile phone tax deduction can affect the accuracy of the whole return.
If you’re operating a business, the same neutral choice applies in related setup areas. GST registration, ABN matters, and BAS compliance can be managed directly through government systems or through structured services that guide the process. Neither route changes the legal rules. The important point is that the claim still needs to be correct, supportable, and consistent with the records you keep.
Official ATO Reference
For primary guidance, refer to the Australian Taxation Office material on income, deductions, and records at the ATO website.
Key Points to Review
This article is general information only. Whether you can claim a deduction depends on your own facts, the nature of your income-earning activities, and the records available to support the claim.
You may choose to lodge directly through official government platforms or use a structured service to assist with preparation and review. Complex situations often warrant professional advice, particularly where there are mixed-use expenses, rental property claims, business assets, or super contribution issues.
Official references:
Baron Tax & Accounting
Website: https://www.baronaccounting.com
Email: info@baronaccounting.com
Phone: +61 1300 087 213
Whatsapp: 0450 468 318
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