What Financial Records Are Needed for BAS Preparation?
Preparing a Business Activity Statement (BAS) is much easier when your financial records are complete, accurate and up to date. For many Australian businesses, the challenge is not the BAS form itself—it is making sure the underlying sales, purchases, GST and payment records are correctly recorded before lodgement.The Australian Taxation Office (ATO) expects businesses to keep records that support the amounts reported on activity statements. Generally, business records need to be retained for at least five years, although some records may need to be kept longer.
So, what records do you actually need for BAS preparation?
Financial Records You Need for BAS Preparation
The exact records required depend on your business structure, GST registration, accounting method and reporting obligations. However, most businesses should have the following information organised before their BAS is prepared.
1. Sales and Income Records
Your sales records provide the starting point for determining the business income and GST collected during the reporting period.
Keep records such as:
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Customer payments
Online sales records
Point-of-sale reports
EFTPOS transactions
Cash sales
Credit card sales
Other business income records
Your records should make it possible to identify which sales are taxable, GST-free or otherwise treated differently for GST purposes.
For businesses using the ATO's Simpler BAS method, GST reporting generally centres on total sales, GST on sales and GST on purchases.
2. Purchase and Expense Records
Purchase records are equally important because eligible business purchases may affect the GST credits reported on your BAS.
Keep:
Supplier invoices
Receipts
Business expense records
Credit card statements
Purchase orders where relevant
Records of recurring business expenses
Evidence supporting business-related purchases
A valid tax invoice may be particularly important when claiming GST credits. The ATO also recommends checking that tax invoices received for purchases containing GST are valid.
For example, if a Perth business purchases office equipment for $1,100 including GST, the relevant invoice should be retained with the other records supporting that transaction.
3. Bank Statements and Transaction Records
Bank records help confirm whether the transactions recorded in your accounting system agree with what actually happened in your business bank accounts.
Before BAS preparation, it is useful to have:
Business bank statements
Credit card statements
EFTPOS records
Online payment reports
Loan transaction records where relevant
Details of transfers between business accounts
Bank transactions should be reconciled with your accounting records rather than simply being assumed to be correct.
This is one reason Bookkeeping Services Perth can be useful for businesses that regularly fall behind with transaction processing or reconciliation.
4. GST Records
GST records are central to BAS preparation.
Your accounting records should clearly identify transactions according to their GST treatment, including:
GST collected on taxable sales
GST paid on eligible business purchases
GST-free sales
Input-taxed transactions
Purchases where GST credits cannot be claimed
Mixed business and private-use transactions
The ATO's Simpler BAS guidance specifically distinguishes between taxable sales, GST-free sales, input-taxed sales and purchases with or without GST.
If transactions have been coded incorrectly in your accounting software, the BAS figures may also be incorrect.
5. Payroll and Employee Records
If you employ staff, payroll information may also be relevant to your broader activity statement and reporting obligations.
Keep records such as:
Payroll reports
Gross wages
PAYG withholding information
Employee payment records
Superannuation records
Single Touch Payroll information
Payroll records should be kept separately and accurately so that amounts reported to the ATO can be supported by your business records.
Businesses that need ongoing assistance may also consider Payroll & Superannuation Processing alongside their regular bookkeeping.
6. Asset and Equipment Purchases
Large business purchases should not be overlooked when preparing your records.
Examples include:
Computers
Vehicles
Machinery
Office equipment
Commercial equipment
Business property-related costs
Keep invoices, contracts, payment evidence and other relevant documentation. Asset records may also be important for purposes beyond the current BAS, including depreciation and future tax reporting.
7. Import and Export Records
Businesses involved in importing or exporting goods may have additional documentation to organise.
Depending on the transaction, this may include:
Customs documentation
Import records
Supplier invoices
Shipping documents
GST information associated with imports
Export sales documentation
GST treatment can differ depending on the circumstances, so these transactions should be recorded carefully rather than treated like ordinary domestic purchases.
What About Cash-Basis and Accrual Accounting?
The timing of transactions reported on your BAS can depend on the accounting basis you use for GST.
Under cash accounting, GST amounts are generally reported according to when payment is received or made. Under non-cash (accruals) accounting, the timing can depend on when payment occurs or when an invoice is issued or received. Special rules can apply to particular transactions.
This means simply adding up invoices issued during a quarter may not always produce the correct BAS figures.
A Simple BAS Preparation Checklist
Before your BAS is prepared, check that you have:
Sales invoices and receipts
Supplier invoices and business expense receipts
Bank and credit card statements
GST-coded transactions
Payroll and PAYG records, where applicable
Asset and equipment purchase records
Import or export documentation, where applicable
Records of private-use portions of mixed expenses
Any adjustments or corrections from previous periods
Accounting software records that have been reconciled
The ATO recommends keeping business records that contain enough information to calculate and support amounts reported on activity statements and tax returns.
Why Accurate Bookkeeping Matters Before BAS Lodgement
A BAS is only as reliable as the financial information behind it.
If transactions have not been entered, bank accounts have not been reconciled or GST has been coded incorrectly, problems can appear when it is time to prepare the statement.
For example, imagine a small business has recorded $55,000 of sales but several supplier invoices are still sitting in an email inbox. Its accounting records may not yet reflect all relevant purchases or GST information. Preparing the BAS before reviewing those records could result in figures that need correction later.
Regular Accounting Services & Bookkeeping Services support can help businesses keep transactions organised throughout the reporting period rather than trying to reconstruct everything immediately before the BAS deadline.
How Long Should You Keep BAS Records?
The ATO states that businesses generally need to keep business records for at least five years. These can include sales and purchase evidence, tax invoices, wage records, GST documents and records associated with activity statements. Some records may have longer retention requirements.
Digital record keeping can make this easier. Businesses should also consider maintaining suitable backups and ensuring information remains accessible if accounting software or systems change.
When Should You Get Help With BAS Preparation?
If your records are incomplete, transactions are frequently unreconciled or you are unsure how particular transactions should be treated for GST, professional assistance can reduce the risk of avoidable errors.
A BAS Agent Perth can assist with BAS-related preparation and lodgement where appropriate, while ongoing bookkeeping can help keep the underlying financial records organised throughout the year.
The important point is that BAS preparation should not begin with the BAS form. It should begin with accurate financial records.
Conclusion
Good BAS preparation starts with good record keeping. Sales invoices, purchase receipts, bank statements, GST records, payroll information and supporting documents all help establish whether the figures reported to the ATO are accurate and supported.
Rather than waiting until the BAS deadline to sort through a quarter's transactions, businesses can make the process considerably easier by keeping their accounting records updated and reconciling transactions regularly.
For Australian businesses, organised records do more than simplify BAS preparation—they provide a clearer picture of how the business is performing and make ongoing tax and accounting responsibilities easier to manage. 2026-9-24 14:59 What Financial Records Are Needed for BAS Preparation? Furniture Shop In Melbourne Donation for Gaushala: Support Cow Care & Rescue Efforts Donation for Gaushala: Support Cow Care & Rescue Efforts Purple Carats engagement ring review Reliable Cross Bearings for Efficient Driveline Performance Explore an Instant Funded Account Golf Earrings: A Stylish Choice for Every Golf Lover Ogden Events Calendar Choosing a Reliable Source for Research Peptides Christinajclay Christinajclay Adventures Are the Most Popular Choice for Desert Travelers
