Key Takeaways
- Poor record keeping is one of the most common sources of tax errors for small businesses.
- Business and personal expenses should be kept separately.
- Not every business expense is automatically tax deductible.
- Mixed business and private expenses generally need to be apportioned correctly.
- GST, BAS and PAYG obligations need to be reported accurately and on time.
- Business owners should keep enough money aside for tax rather than treating all cash received as available for profit.
- Taking money or assets from a company or trust for personal use can have tax consequences and needs to be recorded correctly.
- Businesses should reconcile their accounting records regularly rather than waiting until tax time.
- Keeping invoices, receipts, and other supporting documentation is important when claiming deductions.
- Professional tax advice can help identify errors and tax planning opportunities before they become larger problems.
Main Text Content
Tax mistakes are often caused by everyday business habits
Running a small business involves hundreds of financial decisions.
You receive payments from customers, pay suppliers, purchase equipment, reimburse employees, pay subscriptions, use vehicles, claim expenses, and move money between different accounts.
When these transactions are not recorded correctly, small errors can eventually create larger tax problems.
The ATO’s small business compliance work has found that many businesses are trying to report accurately but still make mistakes. Common problems include bookkeeping errors, missing substantiation, incorrect calculations, incorrect apportionment, and claiming expenses that are not deductible.
The good news is that many of these mistakes can be prevented by putting simple systems in place.
Not keeping proper business records
One of the biggest mistakes a small business can make is treating bookkeeping as something that only needs to be done at tax time.
Businesses need records of transactions related to their tax, superannuation, and registration obligations. These can include sales, expenses, bank records, GST records, asset and stock records, and employee or contractor records.
Without accurate records, it becomes much harder to determine:
- How much the business earned
- How much it spent
- What GST was collected
- What GST credits may be available
- Which expenses are deductible
- How much tax may be payable
- Whether the business is profitable
Good bookkeeping is therefore not just about satisfying the ATO. It also gives the owner a clearer picture of the financial health of the business.
Mixing personal and business expenses
Another common problem is using business accounts for personal purchases or using personal accounts to pay business expenses without properly recording them.
This can make bookkeeping more complicated and create uncertainty around whether an expense is genuinely business-related.
Business.gov.au explains that deductible expenses generally need to relate directly to earning business income. If an expense has both business and private use, only the business portion can generally be claimed.
For example, if a business owner uses a phone for both business and personal purposes, the business-use portion needs to be determined rather than automatically claiming the entire bill.
Keeping separate business bank accounts and business payment methods can make this process much easier.
Assuming every business expense is tax deductible
Just because a business paid for something does not automatically mean the entire amount can be claimed as a tax deduction.
Generally, a deductible business expense needs to relate to earning assessable business income, must not be private in nature and needs appropriate records to support the claim. Mixed-use expenses generally need to be apportioned.
There can also be differences between expenses that can be deducted immediately and costs that need to be claimed over time.
Assets and capital expenses, for example, may be subject to different tax treatments from ordinary operating expenses.
Business owners should therefore avoid assuming that an expense is deductible simply because it appears to be related to the business.
Claiming expenses without enough evidence
Another common mistake is keeping the receipt but not enough information to demonstrate the business purpose of the expense.
A receipt can show that money was spent, but it may not always establish how the expense relates to the business.
Recent business.gov.au guidance specifically highlights this issue. For example, where an expense involves mixed business and private use, supporting evidence such as usage records, call logs or representative diaries may help establish the business-use percentage.
Businesses should therefore keep appropriate supporting documentation rather than relying on a bank statement alone.
Forgetting about GST
GST can create significant problems when businesses do not understand how it affects their sales, purchases, and cash flow.
Businesses registered for GST generally need to report GST information through their Business Activity Statements (BAS).
A BAS may also include other obligations such as PAYG withholding and PAYG instalments, depending on the business.
One common mistake is treating GST collected from customers as if it were business profit.
For a GST-registered business, GST collected may need to be paid to the ATO after considering eligible GST credits.
This is why businesses should avoid spending money simply because it has arrived in the business bank account.
Setting aside amounts for GST and other tax obligations can help prevent a cash flow problem when the BAS becomes due.
Getting BAS figures wrong
A BAS should not simply be submitted based on whatever numbers appear in the accounting software.
Businesses should reconcile their records and check that sales and purchases have been reported in the correct period.
Business.gov.au recommends reconciling BAS figures with business records and checking that purchases and sales are reported in the appropriate period.
Before lodging a BAS, businesses should consider reviewing:
- Sales
- Purchases
- GST collected
- GST credits
- Bank reconciliations
- Payroll information
- PAYG withholding
- Adjustments
- Previous BAS errors
Taking a few extra steps before submission can help identify mistakes early.
Missing tax and BAS deadlines
Even when the information in a tax return or BAS is correct, late lodgement or payment can create additional problems.
Businesses may need to lodge annual tax returns as well as regular BAS and other reports depending on their circumstances.
Business.gov.au recommends lodging and paying tax obligations on time because penalties may apply when obligations are not met.
Small businesses should maintain a tax calendar showing important dates throughout the year.
This can include:
- BAS lodgement dates
- Income tax dates
- PAYG instalments
- PAYG withholding obligations
- Superannuation obligations
- Payroll tax where applicable
- Other state or territory obligations
Leaving everything until the end of the financial year can make tax management significantly more stressful.
Spending tax money before the bill arrives
A business can appear to have plenty of cash while still having significant tax liabilities.
For example, a business might receive $20,000 in customer payments during a period and assume that most of the money is available to spend.
But some of that cash may ultimately need to cover GST, income tax, PAYG withholding, superannuation or other obligations.
Business.gov.au recommends planning for tax as part of cash flow management and suggests putting money aside in a separate account to help ensure funds are available when tax payments are due.
This simple habit can make a significant difference to business cash flow.
Forgetting PAYG obligations
Businesses with employees may have PAYG withholding obligations.
PAYG withholding involves withholding amounts from certain payments, such as employee wages, and reporting and paying those amounts to the ATO.
The amounts withheld are not business revenue.
They are amounts being held and paid to the ATO on behalf of employees.
Failing to properly record, report or pay withheld amounts can create tax and compliance problems.
Business owners should make sure their payroll system is correctly configured, and that payroll records are reconciled regularly.
Treating business money as personal money
This can become particularly important when a business operates through a company or trust.
Business owners may sometimes take money, assets, or other benefits from the business for personal use without properly recording the transaction.
The ATO has specifically highlighted the tax consequences that can arise when business money or assets are used for private purposes through a company or trust. These transactions may need to be correctly recorded and reported in the relevant company, trust, and individual tax returns.
Business owners should therefore understand how they are paying themselves and how withdrawals are being treated for tax purposes.
This is different from simply transferring money whenever personal expenses arise.
Not understanding the difference between salary, drawings and distributions
How a business owner takes money from a business depends on its structure.
A sole trader, partnership, company and trust can have different tax and accounting implications.
For example, money taken from a company is not automatically treated in the same way as a sole trader, drawing money from the business.
This is one area where business owners should avoid copying what another business owner do.
A structure that works for one business may not be appropriate for another.
Forgetting about superannuation obligations
Employers also need to manage superannuation obligations correctly.
Super is not simply another optional business expense.
Businesses with employees need systems in place to calculate, report, and pay required super contributions correctly and on time.
Superannuation should also be considered when assessing the true cost of employing staff.
A business that budgets only wages without accounting for employer obligations may underestimate its actual employment costs.
Not reconciling the accounts regularly
Another common mistake is allowing accounting software to become a storage system rather than a financial management tool.
Bank accounts should be reconciled regularly.
Unreconciled transactions can result in:
- Duplicate transactions
- Missing expenses
- Incorrect GST figures
- Incorrect sales figures
- Unexplained balances
- Incorrect profit calculations
Regular reconciliation makes it easier to identify mistakes while the transactions are still fresh.
It also gives the business owner more reliable financial information throughout the year.
Waiting until tax time to discover problems
Tax planning should not begin when the accountant asks for documents after the end of the financial year.
By that point, many decisions have already been made.
A business that reviews its numbers throughout the year has more opportunities to identify problems and make informed decisions.
Regular reviews can help identify:
- Increasing expenses
- Declining margins
- Cash flow problems
- Unexpected tax liabilities
- Outstanding invoices
- Poor-performing products or services
- Unnecessary subscriptions
- Changes in profitability
Good tax management is therefore closely connected with good financial management.
Not putting enough aside for tax
One of the most common cash flow problems for small businesses is receiving a tax bill without having the money available to pay it.
This can happen when owners focus on revenue and bank balances instead of after-tax profitability.
A better approach is to estimate future tax obligations and regularly allocate money towards them.
The exact amount will depend on the business structure, income, deductions, GST position, and other circumstances.
This is why businesses should work with their accountant or tax adviser to understand what they may need to reserve.
Ignoring changes in the business
Tax obligations can change as a business grows.
A business that starts as a small sole trader may later hire employees, register for GST, purchase assets, operate through a company or trust, or expand into another state.
Each change can create new obligations.
Business.gov.au notes that the taxes applying to a business depend on factors including its structure, location, products or services and whether it employs people.
Business owners should therefore review their tax position when the business changes rather than if the same arrangements will continue to work indefinitely.
Using outdated bookkeeping systems
Technology can help businesses reduce administrative errors.
Digital accounting systems can assist with transaction recording, GST calculations, invoicing, reporting, and financial statements. Business.gov.au notes that digital record keeping can make reporting and record management easier when an appropriate system is in place.
However, software does not eliminate the need for human review.
Incorrectly categorised transactions can still produce incorrect reports.
Businesses should therefore regularly check that their accounting software is set up correctly, and that transactions are being recorded consistently.
Not keeping records long enough
Businesses also need to understand how long their records must be retained.
Most business records generally need to be kept for at least five years, although some records have longer retention requirements.
Records may include:
- Receipts
- Invoices
- Bank statements
- Tax invoices
- Payroll records
- GST records
- Asset records
- Contracts
- Accounting records
Keeping records securely in digital form can make it easier to retrieve information if the ATO requests evidence in the future.
How to avoid common tax mistakes
Avoiding tax mistakes does not necessarily require a complicated system.
Small businesses can start with a few consistent habits:
Keep business and personal finances separately.
Use dedicated business bank accounts and payment methods wherever possible.
Record transactions regularly.
Do not allow months of transactions to accumulate before reviewing the books.
Keep supporting documents.
Store receipts, invoices, and other evidence in an organised system.
Reconcile accounts regularly.
Make sure the accounting records match actual bank and financial activity.
Set aside money for tax.
Treat GST, PAYG and expected tax liabilities as financial obligations rather than available spending money.
Review deductions carefully.
Make sure expenses genuinely relate to the business, and that mixed-use expenses are appropriately apportioned.
Know your deadlines.
Maintain a calendar for BAS, tax, payroll, super and other obligations.
Review the business structure when the business changes.
Growth, new employees, new investments, or changes in ownership can affect tax obligations.
Get professional advice when something is unclear.
It is generally easier to address a tax issue before it becomes a larger problem.
How Sunnyside Financial Group Can Help
Tax management is an important part of running a financially healthy Australian business.
At Sunnyside Financial Group, the focus is not only on preparing tax returns. Businesses can also benefit from support with accounting, tax planning, cash flow management, financial reporting, and broader business advisory.
A regular review of your numbers can help identify potential issues before tax time and give you a clearer understanding of your business’s profitability and cash flow.
Sunnyside Financial Group can help make Australian tax, cash flow and profitability simpler, so business owners can spend less time worrying about their numbers and more time focusing on running and growing their business.
Final Thoughts
Tax mistakes can happen to even well-run small businesses.
Many are not caused by deliberate non-compliance. They can result from rushed bookkeeping, poor documentation, misunderstood deductions, mixed personal and business expenses, or simply not understanding how a particular tax obligation applies.
The best way to reduce these risks is to build good financial habits throughout the year.
Accurate records, regular reconciliations, appropriate tax planning and professional advice can help a business stay organised and avoid unpleasant surprises.
Most importantly, tax should not be treated as something that only matters at the end of the financial year.
For a small business, understanding tax is part of understanding the business itself.
General information disclaimer: This article provides general information only and does not constitute tax, accounting, legal or financial advice. Australian tax obligations can vary depending on your business structure and circumstances. Businesses should seek advice from a registered tax professional or accountant where appropriate.
