How to Claim Business Expenses: 2026 Guide for Small Biz

It's late June. You've got a BAS due, the bank feed is full of half-labelled transactions, and a box of curled receipts is sitting under the desk like a tax problem you can ignore by not looking at it. You can't. In Australia, small businesses claim over $50 billion in deductions annually, and the ATO notes average refunds of $8,700 for compliant small businesses in 2023 according to ATO-based guidance.

Most business owners don't miss deductions because they're lazy. They miss them because they treat expense claims like a shopping list instead of a system. That's why they either underclaim out of fear or overclaim and walk straight into avoidable trouble. If you want to know how to claim business expenses properly, start with records, apportionment, and timing. The list of deductions comes after that.

What You'll Learn

• That Shoebox Full of Receipts Is Costing You Money
• The ATOs Three Golden Rules for Expense Claims
• Identifying Your Most Common Business Deductions
• Substantiation: The Art of Proving Your Claims
• Putting It Together: Apportionment, GST, and Your BAS

Table of Contents

• That Shoebox Full of Receipts Is Costing You Money
• • A messy file is a tax problem
• The ATOs Three Golden Rules for Expense Claims
• • Rule one means a real connection to income
  • Rule two means private use must be carved out
  • Rule three means records, not intentions
• Identifying Your Most Common Business Deductions
• • Operating costs you can usually claim
  • Property investors get caught on repairs versus improvements
• Substantiation The Art of Proving Your Claims
• • What counts as proof
  • Vehicle records are where good claims go bad
• Putting It Together Apportionment, GST, and Your BAS
• • Apportionment is where judgement matters
  • BAS errors usually start with lazy coding
• Claiming Major Purchases Depreciation and Instant Write-Offs
• • Immediate deduction or depreciation
• Your Next Steps An Error-Free Claims Checklist

That Shoebox Full of Receipts Is Costing You Money

A sole trader plumber buys materials from three suppliers, fuel from two servos, software on a monthly subscription, and the odd tool on the way to a job. By tax time, none of that feels organised. Some receipts are faded. Others are missing. The bank statement shows money went out, but not always what it was for.

That mess costs money in two directions. First, you miss legitimate deductions because you can't identify or prove them. Second, you waste hours reconstructing basic bookkeeping that should've been captured when the expense happened. If you're still typing receipt details by hand, stop. Tools for automated receipt processing via OkraPDF can pull structured data out of receipts, which makes categorising and retaining records far less painful.

A messy file is a tax problem

The ATO doesn't care that you were busy. It cares whether the expense was business-related, whether any private use has been excluded, and whether you can prove the claim. A receipt system doesn't need to be fancy, but it does need to be consistent.

Three setups usually work in practice:

• Simple operator setup: business bank account, one card for business purchases, receipt photos saved straight away.
• Software setup: Xero or MYOB with bank feeds and supplier rules.
• Hybrid setup: spreadsheet plus cloud folder, if volume is low and you're disciplined.

A shoebox is not a record-keeping system. It's delayed admin with interest attached.

If your current process relies on memory, rebuild it before the next quarter. A practical starting point is this guide to ways of record keeping for tax and business use. Why this matters: the businesses that claim cleanly aren't guessing at year end. They've made the claim easy to prove months earlier.

The ATOs Three Golden Rules for Expense Claims

You don't start with “Can I claim it?” You start with the three tests the ATO applies. If the claim fails one of them, the category doesn't matter.

ATO statistics show that of the $22.4 billion in work-related expenses claimed, adjustments are most common when one of the three golden rules is broken, according to this ATO-based summary. That same framework applies to business claims. The rule set is simple. Applying it properly isn't.

Rule one means a real connection to income

The expense must be incurred in earning your assessable income. Rent for your shop fits. Advertising fits. Accounting software usually fits. School shoes for your child don't become deductible because you answered work emails while buying them.

The problem isn't the obvious stuff. It's the grey-area spending that owners try to force into a business label after the fact. If the purpose is mixed, only the business portion is claimable.

Rule two means private use must be carved out

Many otherwise valid claims fail at this stage. Your mobile phone can be partly deductible. Your ute can be partly deductible. Home internet can be partly deductible. None of that means the full amount is fair game.

Common Pitfall

• Branded car myth: Putting your logo on the side of a car doesn't turn private travel into business use.
• Phone bill shortcut: Using your personal phone for client calls doesn't make the whole monthly plan deductible.
• Home expense overreach: Working from the kitchen table doesn't justify claiming every household cost.

Practical rule: If you can't explain how you worked out the business percentage, the claim is weak.

The legal backbone for this sits in the ordinary deductibility rules under tax law, but the practical version is easier to remember. Business use only. Private use excluded. Proof kept. If you need a plain-English companion piece, this article on what is a tax deductible expense is useful.

Rule three means records, not intentions

Wanting to claim an expense isn't evidence. A bank transaction alone often isn't enough because it may not show what was purchased, from whom, or why. The ATO wants records that tie the payment to the business purpose.

That's why rushed claims assembled from memory are risky. A clean claim is built from documents created at the time of purchase, not from stories built months later. Why this matters: once you understand the rules, you stop arguing with the tax law and start structuring your records to fit it.

Identifying Your Most Common Business Deductions

I see the same problem every year. A business owner has spent money that should be deductible, but the claim falls apart because the expense was coded badly, mixed with private spending, or treated as an immediate deduction when it should have been handled as a capital item.

The useful question is not just what can you claim. It is what kind of cost it is, when the deduction is available, and how you prove the business portion if the expense is mixed-use.

A practical way to sort deductions is by function. Running costs sit in one group. Asset purchases sit in another. Property expenses need separate attention because repairs, improvements, borrowing costs, and holding costs do not all get the same treatment. If you want a broader self-employed overview, this guide to claimable business expenses for sole traders is a useful companion.

Operating costs you can usually claim

For sole traders and SMEs, the regular deductions usually come from ordinary operating costs. These are the recurring expenses that keep the business trading.

Expense TypeExampleDeductibility Status

Office supplies

Printer paper, stationery, postage

Generally deductible if used for business

Advertising

Online ads, flyers, website hosting

Generally deductible if tied to business activity

Professional fees

Tax agent, bookkeeping, legal advice related to the business

Usually deductible

Vehicle costs

Fuel, servicing, registration

Claim only the business portion

Software

Xero, MYOB, job management platforms, design tools

Usually deductible if used for business

Insurance

Public liability, business contents, professional indemnity

Usually deductible

Rent and utilities

Commercial premises rent, electricity for business site

Usually deductible

Home office costs

Running expenses for business use at home

Apportioned claim only

Rental property expenses

Council rates, agent fees, eligible repairs

Depends on the nature of the expense and use

That table is the easy part. The actual work is in the grey areas.

A builder using a ute for site visits, school drop-off, and weekend trips cannot claim the lot. A consultant working from home cannot throw the full internet bill into the tax return. A café owner paying for accounting software with a package that also covers a separate side project needs to split the cost properly. Those are the claims that get adjusted because the category might be right, but the percentage is wrong.

Different businesses also attract different scrutiny. Trades usually rack up tools, protective equipment, vehicle costs, insurances, and contractor payments. Consultants often claim software, phone, home office running costs, industry subscriptions, and training that relates to their current income-earning work. Retailers need clean treatment of merchant fees, POS systems, freight, packaging, and stock-related spending. For more Australian examples by category, see this guide to small business tax deductions in Australia.

Property investors get caught on repairs versus improvements

Property claims are where poor classification gets expensive.

A repair generally fixes wear and tear and puts something back into working order. An improvement gives you something better than what was there before, changes the character of the asset, or forms part of a larger upgrade. That difference affects whether you claim it now, over time, or as part of the property's cost base.

A leaking tap replaced with a similar tap will often be a repair. Replacing an entire kitchen with better finishes, extra cabinetry, and new appliances is usually not a repair just because the old kitchen was tired. I spend a lot of time correcting rental schedules where owners have bundled new assets, structural work, and genuine repairs into one line called "maintenance". That shortcut creates problems fast.

The safest approach is to separate property spending as you go. Keep invoices detailed. Note what was done. If one bill includes both repair work and improvement work, split it before year-end while the facts are still clear.

Substantiation: The Art of Proving Your Claims

An expense without proof is just a claim waiting to be cut back. The ATO compliance position is blunt. Claims are disallowed in 68% of reviews due to a lack of substantiation, particularly missing logbooks or diaries, and records must be kept for five years according to ATO compliance data.

What counts as proof

A proper record should show the supplier, date, amount, and what you bought. For some lower-value items, a diary record supported by a bank transaction may help. For larger or more scrutinised claims, get the tax invoice and keep it legible.

The tax invoice threshold that often matters in practice is more than $82.50 GST-exclusive, with records retained under the substantiation rules noted in the verified data. Digital copies are fine if they're clear and retrievable. That means a phone photo can work. A blurry image buried in your camera roll is asking for trouble.

Pro-Tip

• Capture immediately: photograph the receipt before it fades.
• Name consistently: supplier, date, amount, and category in the file name or app notes.
• Store centrally: don't split records across text messages, email folders, and random downloads.
• Match monthly: reconcile receipts against the bank feed while the purchase is still fresh.

Xero and MYOB are practical for ongoing bookkeeping. The ATO app can also help if your setup is simpler. For clients with catch-up work, Australia Wide Tax Solutions handles BAS preparation and tax lodgements, which is useful when the issue isn't just missing receipts but years of untidy records.

Vehicle records are where good claims go bad

Vehicle claims attract mistakes because owners mix methods, estimate usage, or rely on memory. For motor vehicles, the accepted methods in the verified data include the logbook method using a representative 12-week period, or the cents-per-kilometre method with the applicable cap and rate for the relevant year. The record-keeping requirement matters as much as the method itself.

A logbook often works better when business use is high and consistent. The cents-per-kilometre method is simpler, but simple doesn't mean sloppy. You still need a reasonable basis for the kilometres claimed.

This short explainer is worth watching before you try to backfill a year of fuel and travel from memory.

Keep the evidence that proves the method, not just the final number you typed into the return.

Why this matters: substantiation isn't admin for admin's sake. It's the difference between a defensible deduction and a claim that disappears the minute someone asks for backup.

Putting It Together: Apportionment, GST, and Your BAS

Business owners often find themselves in a difficult situation at this stage. They understand that an expense is partly business. They even know some GST may be claimable. Then they lodge a BAS with rough percentages and inconsistent coding, and the numbers no longer agree with the year-end return.

Around 55% of BAS errors stem from misclassifying items or incorrectly claiming GST credits, especially on mixed-use expenses, and late lodgers can face a General Interest Charge of up to 11.5% p.a. (FY25) according to the ATO guidance summarised in this BAS error resource.

Apportionment is where judgment matters

Apportionment means splitting an expense between business and private use on a fair basis. That sounds straightforward. It isn't, unless you keep a method and stick to it.

For example:

• Mobile phone: review a representative period and work out business call and data use.
• Home internet: estimate business usage based on actual working patterns.
• Home office running costs: use the accepted fixed-rate method where appropriate. The verified data refers to 67 cents per hour for 2024-25 for eligible work-from-home running costs.
• Vehicle expenses: apply the method you've chosen and keep the supporting records.

Common Pitfall

Claiming 100% of the GST on an expense with a private component is one of the most common BAS mistakes. If only part of the expense relates to business use, only that part of the GST credit is available.

GST doesn't fix a bad deduction. If the underlying expense is partly private, the GST claim is partly private too.

BAS errors usually start with lazy coding

The trouble rarely starts at lodgement. It starts months earlier when transactions are coded without thinking. A café owner uses the same card for stock, groceries, and a family fuel stop. A consultant lets software subscriptions renew on a personal card and sorts them out later. A landlord pays for repairs and improvements from the same account with no notes.

That's how BAS prep turns into detective work. Use clear chart-of-account categories, review mixed-use expenses before quarter end, and don't leave GST treatment to guesswork. If you need a practical walk-through, this guide on how to prepare a Business Activity Statement is worth keeping open while you reconcile. Why this matters: BAS accuracy affects cash flow, compliance risk, and how much rework you create for yourself at year end.

Claiming Major Purchases, Depreciation, and Instant Write-Offs

Big purchases need a different mindset. Buying a laptop, office furniture, or a work vehicle isn't the same as buying printer paper. These items are usually capital assets, which means the cost may need to be claimed over time rather than all at once.

The simplified depreciation rules under Division 40 have been a major change in Australian tax practice, and the verified data notes an immediate deduction threshold of $20,000 extended through 2023-24 for eligible businesses, while separate verified data also refers to a $150,000 instant write-off threshold for 2024-25 announced in the May 2024 Budget for eligible entities under the relevant settings. The key point is simple. Check the rule that applies for your year and eligibility before assuming you can deduct the full amount immediately.

Immediate deduction or depreciation

Take a common example. A sole trader buys a laptop used entirely for business. If it qualifies under the instant asset write-off rules that apply for that year and the business is eligible, the deduction may be immediate. If it doesn't qualify, the asset is generally depreciated over its effective life under the depreciation rules.

Now change the facts. The same sole trader uses the laptop partly for personal streaming and family admin. The claim has to be apportioned for business use first. The tax treatment only starts after that percentage is worked out.

A vehicle purchase raises the same issue. Owners focus on the sticker price. The primary questions are:

• Eligibility: Does the business meet the turnover and asset conditions for the year?
• Use: What percentage is business use?
• Timing: When was the asset first used or installed,, ready for use?
• Evidence: do the invoice and finance records line up with the claim?

For a deeper look at the immediate deduction side of the rules, keep this guide to what is an instant asset write-off handy. Why this matters: the tax outcome on a major purchase depends on timing, use, and eligibility, not on what the salesperson told you.

Your Next Steps An Error-Free Claims Checklist

The businesses that claim cleanly at tax time usually do the work in small steps during the year. Good records are not about admin for its own sake. They are what let you prove the claim, apply the right business-use percentage, and avoid redoing six months of transactions when the BAS or return is due.

Use this checklist to tighten the part of your process that is causing errors.

• Pick one system: use Xero, MYOB, the ATO app, or a spreadsheet with a cloud folder. Any of them can work if you use them consistently.
• Separate business and private spending: a dedicated business bank account makes coding cleaner and makes mixed-use problems easier to spot early.
• Review recurring charges: scan bank and card statements for software, memberships, subscriptions, and direct debits. Match them to tax invoices and check whether any are partly private.
• Start usage records now: for cars, phones, internet, and home office costs, keep the logbook, diary, or working papers from the start. Reconstructing business use later usually falls apart under review.
• Set a quarterly check-in: reconcile transactions, review GST coding, and test whether your expense categories still reflect how the business is operating before the BAS is lodged.
• Train the person doing the data entry: if staff or a bookkeeper post transactions, give them a written procedure with examples of common edge cases. A short SOP cuts repeat mistakes. If you need a model for documenting workflow, this guide on using Learniverse to automate procedure training is a practical example of turning ad hoc admin into a repeatable process.

Some claims need extra care. A sole trader using one mobile for both client calls and personal use needs a reasonable method for apportionment. A property investor paying for repairs through the same account used for private spending needs records that show what relates to the rental. An SME claiming software, vehicles, and contractor costs across multiple entities needs coding that matches the legal structure, not just the bank feed description.

DIY works for straightforward records. Once you are dealing with overdue lodgements, mixed-use assets, rental property adjustments, capital purchases, or messy books, professional advice can prevent expensive errors.

If you need help sorting overdue returns, preparing BAS, or working out how to claim business expenses without creating audit problems, Australia Wide Tax Solutions can help you get the records straight, apportion claims properly, and lodge with confidence.

What is tax depreciation in Australia and how does it work?

Tax depreciation allows businesses and investors to deduct the cost of income-producing assets over their ATO-determined effective life. Rather than claiming the full cost in the purchase year, you deduct a portion annually using the prime cost or diminishing value method. The effective life of each asset determines how many years it is depreciated.

What is the instant asset write-off for Australian businesses?

The instant asset write-off allows eligible businesses to immediately deduct the full cost of qualifying depreciable assets in the year they are first used or installed. Eligibility criteria, thresholds, and turnover limits change regularly — confirm current rules with the ATO for the 2025-26 income year rather than relying on prior-year thresholds, which are frequently amended.

What is the difference between prime cost and diminishing value depreciation?

Prime cost depreciates the asset at a constant percentage of original cost, producing equal annual deductions. Diminishing value applies a higher percentage to the remaining undeducted value, generating larger deductions in early years that reduce over time. The choice affects when deductions are taken but not the total amount ultimately claimed.

Can property investors claim depreciation?

Residential property investors can claim plant and equipment depreciation (Division 40) on removable items like appliances and carpet, and the capital works deduction (Division 43) on structural components at 2.5% per year for buildings constructed after 15 September 1987. Legislation from May 2017 restricts Division 40 claims on second-hand residential assets for properties acquired after that date.

What records do I need to support depreciation claims?

Keep purchase receipts, invoices, and documents establishing the date and cost of each depreciable asset. For property, retain construction contracts, settlement statements, and a quantity surveyor's schedule. The ATO can request records for up to five years after the relevant income year. Without records, depreciation claims can be reduced or disallowed on audit.