A BAS deadline can expose every loose end in your books: unreconciled bank transactions, receipts sitting in a shoebox, invoices coded to the wrong account, or payroll figures that do not match. Knowing how to prepare a BAS properly turns the process from a quarterly scramble into a reliable financial checkpoint for your business.
A Business Activity Statement reports and pays several Australian Taxation Office obligations. For many small businesses, GST is the main component. Depending on your registration and circumstances, your BAS may also include PAYG withholding, PAYG instalments, fuel tax credits or other amounts. The detail on your statement will vary, but the preparation discipline should not: work from complete, reconciled records and check the figures before you lodge.
Before reviewing a single transaction, confirm the period shown on your BAS and the reporting method your business uses. Most small businesses report quarterly, while some report monthly. Your GST accounting basis also matters.
Under the cash method, you generally report GST when you receive customer payments and pay supplier bills. Under the non-cash, or accruals, method, you generally report GST when you issue an invoice or receive a bill. A sale made near the end of a quarter can therefore fall into a different BAS period depending on your method.
Do not assume the period in your accounting software tells the full story. Check that the BAS dates, GST registration details and reporting method align with the ATO statement. If you have changed accounting software, altered your business structure or recently registered for GST, this check is particularly worthwhile.
A BAS is only as accurate as the records behind it. Enter all sales, supplier bills, expenses, bank fees, loan movements and owner drawings for the reporting period. Make sure invoices are allocated to the correct income or expense accounts, rather than leaving them in a general uncategorised account.
Then reconcile each business bank account, credit card, loan account and payment platform. The balances in your accounting file should agree with the relevant statements at the end of the BAS period. This is where missing transactions, duplicated expenses and personal purchases charged to a business card are usually found.
For businesses using payment processors, include clearing accounts in the review. The gross customer sale, processing fee and net bank deposit need to be recorded correctly. Treating only the net deposit as income can understate sales and produce an incorrect GST position.
Your software may generate a BAS report in seconds. That does not mean every transaction has been treated correctly. Review the underlying transactions, particularly material or unusual amounts.
Check that taxable sales are reported with GST where required, and that GST-free sales have not been mistakenly included as taxable. Examples of GST-free income can include certain health services, education and exports, but the treatment depends on the specific supply. Residential rent and many financial supplies are commonly input taxed, which is different again.
On the purchases side, confirm you are only claiming GST credits where you are entitled to them. A valid tax invoice is generally required for purchases over $82.50 including GST. Expenses with private use, such as mobile phones, vehicles or home-office costs, may need an adjustment. Some payments, including wages, loan repayments, bank interest and most insurance-related amounts, do not carry GST in the same way as ordinary business purchases.
A useful control is to compare your GST collected on sales and GST paid on purchases with prior quarters. A sharp movement is not automatically wrong, especially if you have had a strong sales month or purchased equipment. It is, however, a prompt to understand the reason before lodging.
Your BAS sales figure should make sense against the way your business earns income. Compare sales in your accounting system with invoicing reports, point-of-sale totals, online store reports, booking systems and payment processor statements.
If your business reports GST on a cash basis, unpaid invoices should not generally be included in the current BAS sales total. Conversely, customer payments received for invoices from an earlier period may be included. This timing difference is a common source of confusion for owners who look only at their profit and loss report.
Also check for credit notes, refunds, deposits and sales recorded through a clearing account. These items can be legitimate, but they need the right tax treatment and period allocation. A clean sales reconciliation gives you confidence that the amount at G1 and the GST payable on sales are supported by actual trading activity.
If you employ staff, your BAS may include PAYG withholding. Reconcile the wages reported in your payroll system with the gross payments and tax withheld on the BAS. Your Single Touch Payroll reporting, payroll journals and BAS figures should tell a consistent story.
This review is more than a compliance exercise. Differences can point to a pay run posted twice, a terminated employee payment treated incorrectly, a payroll liability not cleared, or an incorrect date used in the payroll system. Resolve differences before lodgement rather than carrying them into the next period.
Superannuation is not generally reported as a BAS label, but it remains a critical payroll obligation. Use BAS preparation as a prompt to confirm your super records are current and payments are planned ahead of the relevant due dates. Good payroll controls reduce the risk of cash-flow shocks as well as ATO issues.
Run the BAS report and review the key labels alongside your reconciliations. For a full GST BAS, this commonly means checking total sales, GST on sales and GST on purchases, as well as any PAYG withholding or instalment amounts shown on your form. Your accounting software can assist, but it cannot judge whether a transaction was business-related or whether an unusual payment was coded correctly.
Look at the resulting payment or refund in the context of your business. If the figure is unexpected, investigate it. Common causes include large asset purchases, invoices dated in the wrong period, sales coded GST-free by mistake, or a reconciliation that has not been completed.
Once satisfied, lodge by the due date shown on your BAS and arrange payment if an amount is owing. Lodgement and payment dates can differ in some circumstances, and registered BAS or tax agents may have access to different lodgement arrangements. Do not rely on a previous quarter’s deadline. Check the statement and plan your cash flow around the actual amount due.
Lodging the statement is not the end of the job. Keep the reports, reconciliations, invoices, receipts and working papers that support the figures. Digital copies are acceptable when they are clear, complete and accessible. A consistent document-capture process is far easier than trying to reconstruct a quarter of expenses after an ATO query.
For most businesses, a practical routine is to reconcile weekly or monthly, review GST coding as transactions are entered and set aside funds for expected BAS payments. This gives you a current view of cash flow instead of treating tax as a surprise at quarter-end.
Preparing your own BAS can work well when transactions are straightforward, records are current and you understand the GST treatment of your income and expenses. It becomes riskier when you have employees, mixed private and business costs, multiple sales channels, property transactions, international suppliers, asset purchases or overdue bookkeeping.
A registered BAS agent can prepare and lodge your BAS, correct errors in the records and explain what the numbers mean for cash flow. Everest Accounting provides this support as part of a broader bookkeeping and compliance service, helping business owners stay on top of obligations without building an in-house finance team.
The best BAS process is not the one completed in a rush on deadline day. It is the one that leaves your accounts reconciled, your obligations funded and your next business decision based on numbers you can trust.
