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Tax Tips for Small Business Owners in Australia: 10 EOFY Mistakes to Avoid
Tax time feels much easier when the bookkeeping is already under control. The trouble is that many small business owners only realise there is a problem when EOFY arrives, receipts are missing, BAS figures do not line up, and the accountant starts asking for details from months ago.
This guide covers practical tax tips for small business owners Australia wide, with examples for sole traders, companies, tradies, consultants, retailers and professional service businesses. It is written from a bookkeeping point of view, so the focus is on records, systems and habits that make tax preparation less stressful.
This article provides general information only. It is not personalised tax, accounting or financial advice. Always check current rules with the ATO or speak with a registered tax agent or accountant before making tax decisions.
Why good bookkeeping matters before tax time
Tax is not just something that happens once a year. Every sale, supplier bill, wage payment, asset purchase and BAS lodgement feeds into your final tax position.
When your bookkeeping is updated regularly, you can:
See whether the business is actually profitable
Track claimable business expenses
Keep better GST and BAS records
Avoid duplicate or incorrect claims
Plan for tax bills before they arrive
Give your accountant cleaner information at EOFY
For example, a Melbourne electrician who updates Xero weekly will usually have a clearer picture of vehicle costs, materials, subcontractor payments and GST owed than someone who sorts a shoebox of receipts in June.
That is the real value of small business bookkeeping. It turns tax from a scramble into a process.
Keep business and personal finances separate
One of the simplest small business tax tips is also one of the most commonly ignored: keep business and personal spending separate.
Use a dedicated business bank account for income and expenses. If you use a credit card for business, try to keep it business-only as well.
This makes it easier to:
Match transactions in Xero or another bookkeeping system
Identify business expenses
Avoid claiming private costs by mistake
Explain transactions if your accountant or the ATO asks questions
A sole trader might think, “It all belongs to me anyway.” That may be true from a cash perspective, but mixed transactions create messy records. A weekly grocery shop, children’s school expense and client lunch on the same card can take extra time to sort and increase the chance of errors.
For companies, separation is even more important. Company money and personal money should be treated carefully, with proper records for wages, director payments, loans or reimbursements.
Keep accurate receipts and financial records
The ATO expects businesses to keep records that explain their income and deductions. In practice, that means keeping invoices, receipts, bank records, payroll reports, BAS records and supporting documents.
Good tax records for small business should show:
What was purchased
When it was purchased
Who supplied it
How much it cost
How it relates to the business
A bank transaction alone may not be enough. “Bunnings $286” tells you where money went, but not whether it was tools, timber for a client job, a private garden purchase or cleaning supplies for the business.
Digital record keeping helps. If you use Xero bookkeeping, you can attach receipts to transactions so the evidence sits with the expense. Apps and email forwarding tools can also reduce the risk of faded paper receipts.
Understand legitimate small business deductions
Small business tax deductions generally need to be connected to earning assessable business income. The expense must be business-related, and you need records to support the claim.
Common deductible business expenses may include:
Accounting and bookkeeping fees
Advertising and marketing costs
Bank fees on business accounts
Business insurance
Motor vehicle expenses, where properly recorded
Office supplies and software subscriptions
Rent or occupancy costs for business premises
Tools and equipment used in the business
Training related to the business
Wages and superannuation for employees
The key word is business. If something has both business and private use, only the business portion may be claimable.
For example, a consultant who uses a mobile phone for both client calls and personal use should keep a reasonable basis for the business-use percentage. A retailer buying stock for resale is different from buying clothes for personal wear.
Do not assume an expense is deductible just because another business owner claimed it. The facts matter.
The 10 EOFY tax mistakes small businesses should avoid
Here are 10 common EOFY mistakes we see in small businesses, and how to avoid them.
1. Leaving bookkeeping until tax time
This is the big one. Waiting until June or July to update a full year of bookkeeping usually means missing receipts, forgotten details and rushed decisions.
A better habit is to update your bookkeeping weekly or monthly. That gives you time to fix issues while the information is still fresh.
2. Mixing business and personal expenses
Mixed accounts make it harder to identify deductions and easier to claim the wrong thing. They also add time to bookkeeping, which can increase costs.
Set up separate accounts and pay yourself properly through drawings, wages or other accountant-approved methods.
3. Claiming expenses without evidence
If you cannot show what an expense was for, the claim may be difficult to support. Keep receipts, invoices and notes where needed.
For example, if you take a client to lunch, record who attended and the business reason. Your accountant can then advise whether and how it should be treated.
4. Claiming private expenses as business expenses
This is a common tax deduction mistake. Personal holidays, family meals, private clothing and household expenses are not automatically deductible because a business owner paid for them.
If an expense has mixed use, record the business portion clearly.
5. Forgetting GST treatment on BAS
BAS and GST records need care. Not every transaction includes GST, and not every business expense gives rise to a GST credit.
Examples that often need checking include bank fees, wages, superannuation, overseas subscriptions, some government charges and transactions from suppliers not registered for GST.
Use the correct tax codes in Xero and review unusual items before lodging BAS.
6. Treating asset purchases incorrectly
Business assets, such as vehicles, machinery, computers, tools and fit-out items, may need to be depreciated rather than fully claimed upfront. The treatment depends on current tax rules, the type of asset and how it is used.
Do not guess. Record the asset clearly, keep the invoice, and ask your accountant how it should be treated under current ATO rules.
7. Poor payroll, PAYG and superannuation records
Payroll records must be accurate. Employers need to keep records for wages, PAYG withholding, superannuation, leave and employee details.
Practical examples include:
Recording hours correctly for casual staff
Keeping payslips and payroll reports
Reconciling payroll to bank payments
Checking superannuation has been processed correctly
Keeping contractor records where relevant
Payroll mistakes can create tax, compliance and staff issues, so it is worth getting the system right.
8. Not reconciling bank accounts
Bank reconciliation checks whether your accounting file matches the real bank account. If it is not done regularly, your reports may be wrong.
A retailer might think they made a strong profit, only to find merchant fees, refunds or stock purchases were coded incorrectly. A builder might have duplicate supplier bills sitting in the system.
Reconciliation is one of the best ways to catch problems early.
9. Not setting aside money for tax
Profit does not mean all the cash is available to spend. Some of it may need to go towards income tax, GST, PAYG withholding, superannuation or other obligations.
A practical approach is to transfer money regularly into a separate tax savings account. The right amount depends on your business and tax position, so ask your accountant for guidance.
10. Not reviewing profit, cash flow and expenses during the year
EOFY should not be the first time you look at your numbers. Regular reporting helps you spot trends early.
For example:
A tradie may notice fuel and materials costs rising
A consultant may see unpaid invoices stretching cash flow
A retailer may find slow-moving stock tying up money
A professional service firm may see wages growing faster than revenue
Good reporting gives you time to act before problems become expensive.
BAS and GST records need regular attention
If your business is registered for GST, BAS record keeping should happen throughout the year, not just when the BAS is due.
Your BAS may include GST collected on sales, GST credits on purchases, PAYG withholding and other obligations depending on your circumstances. The exact requirements depend on your business, so check the ATO or speak with a registered BAS agent or accountant.
The bookkeeping side is about clean data. That means:
Sales are recorded correctly
Expense tax codes are reviewed
Bank accounts are reconciled
Payroll reports match the accounts
GST reports are checked before lodgement
Supporting documents are kept
Young Guns Bookkeeping provides BAS support for small businesses that want help keeping records organised and lodgements on track. A BAS Calculator can also be useful for estimating upcoming obligations, but it should not replace proper records or professional advice.
Prepare your bookkeeping before EOFY
EOFY preparation is much easier when you start before the final week of June.
A practical EOFY bookkeeping checklist includes:
Reconcile all business bank accounts
Check credit card accounts
Review unpaid invoices and bills
Follow up missing receipts
Check payroll reports
Review superannuation records
Confirm asset purchases are listed clearly
Review loan accounts and finance payments
Check GST coding on unusual transactions
Ask your accountant what they need before year-end
If you run a company, your accountant may also review director loans, dividends, wages and other matters. These areas can have tax consequences, so do not leave them until the last minute.
For sole traders, EOFY is a good time to check whether all income has been recorded, including cash, card, bank transfer and platform payments.
Use Xero to make tax preparation easier
Xero can make bookkeeping and tax preparation much easier when it is set up and used properly.
With Xero bookkeeping, you can:
Connect bank feeds
Reconcile transactions regularly
Attach receipts and bills
Track invoices and payments
Run profit and loss reports
Review GST reports
Process payroll where suitable
Share access with your bookkeeper and accountant
The software does not fix everything by itself. Wrong tax codes, duplicated transactions or poor setup can still create messy reports. That is where Xero Training helps. When business owners and staff know how to code transactions, upload receipts and read basic reports, the file becomes more reliable.
For a Melbourne café, that might mean separating food suppliers, merchant fees, wages, rent and equipment purchases properly. For a consultant, it might mean tracking software subscriptions, client income, subcontractors and home office records more clearly.
Know when to use a bookkeeper and when to use an accountant
A bookkeeper and an accountant both help with financial information, but they usually do different jobs.
A bookkeeper can help with:
Day-to-day bookkeeping
Bank reconciliations
Accounts payable and receivable
Payroll processing
BAS preparation and lodgement, if registered
Xero setup and clean-up
Regular reporting
An accountant or tax agent can help with:
Tax planning and tax advice
Annual tax returns
Business structure advice
Depreciation and asset treatment
Tax compliance questions
Complex ATO matters
Financial statements and year-end adjustments
In a good setup, the bookkeeper keeps the records accurate during the year, and the accountant uses those records to prepare tax work and provide advice. The cleaner the bookkeeping, the easier it is for the accountant to do their job.
FAQs about small business tax and bookkeeping in Australia
What tax deductions can a small business claim?
A small business may be able to claim expenses that are directly connected to earning business income, provided there are records to support the claim. Common examples include bookkeeping fees, insurance, software, tools, business phone use, rent, stock, contractor costs and wages. The exact treatment depends on the expense and your situation, so check with your accountant or the ATO.
What records should a small business keep?
Keep invoices, receipts, bank records, payroll records, BAS and GST reports, superannuation records, asset purchase documents, loan statements and any notes that explain business use. Records should be clear enough to show what happened, when it happened, the amount involved and how it relates to the business.
How can bookkeeping help with tax?
Bookkeeping keeps your income, expenses, GST, payroll and business records organised during the year. This helps your accountant prepare tax returns more efficiently and reduces the risk of missing deductions, claiming incorrectly or relying on incomplete information.
How often should bookkeeping be updated?
For most small businesses, weekly or monthly bookkeeping is much better than waiting until EOFY. Businesses with high transaction volumes, payroll or GST obligations may need more frequent updates.
What is the difference between a bookkeeper and an accountant?
A bookkeeper usually manages day-to-day records, reconciliations, payroll, BAS and reporting. An accountant or tax agent usually handles tax advice, annual tax returns, business structure advice and year-end tax matters. Many businesses need both.
Do I need Xero for my small business?
You do not have to use Xero, but cloud accounting software can make small business bookkeeping easier. Xero can help with bank feeds, invoicing, receipt storage, payroll and reporting when it is set up correctly.
Should I set aside money for tax?
Yes, in many cases it is sensible to set aside money regularly for tax and other obligations. The right amount depends on your business structure, profit, GST registration, PAYG obligations and accountant’s advice.
Can a bookkeeper lodge my BAS?
A bookkeeper can lodge BAS only if they are a registered BAS agent or working under the right supervision. Always check that the person handling BAS work is properly qualified and registered where required.
Get your bookkeeping ready before EOFY
The best tax result usually starts with clean records, regular reviews and fewer surprises. If your accounts are behind, your BAS feels rushed or your Xero file needs a tidy-up, it is better to fix it before tax time pressure hits.
Young Guns Bookkeeping helps small businesses across Melbourne and Australia with Bookkeeping, BAS, Payroll, Xero, Xero Training and Reporting. If you want practical help getting your books EOFY-ready, reach out to Young Guns Bookkeeping and get your records working properly before the next tax deadline.
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