Summary – Australian online sellers need to track more than the money deposited into their bank accounts. Accurate e-commerce bookkeeping means recording gross sales, GST collected, marketplace fees, refunds, stock movements, supplier invoices and payment gateway charges. Whether you sell through Shopify, Amazon, eBay, Etsy or your own website, keeping these records organised helps you prepare accurate Business Activity Statements (BAS), monitor profitability and meet Australian Taxation Office (ATO) requirements.
Running an online store can look straightforward: customers place orders, payment platforms process transactions, and marketplace payouts arrive in your bank account. However, the amount deposited is not necessarily your total sales or profit.
Marketplace fees, refunds, shipping charges and GST can all affect the final figure. Without a clear record of each transaction, Australian online sellers may struggle to reconcile their accounts, calculate their tax obligations or understand which products are genuinely profitable.
So, what should an online business track to keep its finances accurate? Here are the essential records and practical steps to build a reliable bookkeeping process.
1. What Sales Records Must Australian Online Sellers Keep?
Every online seller should maintain a clear record of sales, regardless of whether orders come through a marketplace or a standalone website.
At a minimum, record:
- Order date, order number and sales channel.
- Product description, SKU and quantity sold.
- Gross sale value and discounts.
- Shipping charges paid by customers.
- GST charged, where applicable.
- Refunds, returns and cancelled orders.
- Payment method and transaction reference.
These details help you compare sales reports with payment gateway statements and bank deposits.
For example: A Melbourne-based clothing retailer sells products through Shopify and eBay. If the owner records only the weekly deposits received from each platform, it becomes difficult to identify whether a shortfall came from refunds, transaction fees or missing payments.
Keeping separate sales records for each channel makes reconciliation easier and provides a clearer picture of business performance.
Digital records are generally acceptable, provided they are accurate, secure and accessible when required. Businesses should retain relevant tax records for the applicable period, which is generally five years for many Australian tax records.
2. What GST Records Should Online Sellers Track?
GST record-keeping is a central part of running a compliant Australian online business. Businesses registered for GST generally need to account for GST on taxable sales and may be entitled to claim GST credits on eligible business purchases.
Australia’s standard GST rate is 10%, but GST treatment depends on the transaction. Not every sale or expense should automatically be treated as taxable.
Online sellers should track:
- GST collected on taxable sales.
- GST-free and input-taxed transactions, where relevant.
- GST charged on eligible business purchases.
- Supplier tax invoices and other supporting documents.
- Marketplace fees and any GST included in those fees.
- Refunds and adjustments affecting GST.
- Records needed to prepare and reconcile BAS.
Most businesses must register for GST when their GST turnover reaches or is expected to reach the $75,000 registration threshold. Different rules can apply to certain businesses and non-resident sellers, so the circumstances matter.
If you are unsure whether your store needs to register, review the GST registration requirements before making assumptions based on sales volume alone.
Remember that having a GST-registered business does not automatically mean every transaction includes GST. Correct tax treatment depends on what you sell, who you sell to and the relevant GST rules.
3. How Should Online Sellers Track Marketplace Fees and Payouts?
One of the most common e-commerce bookkeeping mistakes is recording the net marketplace payout as total sales.
Platforms and payment providers may deduct selling commissions, payment processing charges, advertising fees, subscription costs, shipping labels and other expenses before transferring money to your account.
These deductions should be reconciled rather than hidden inside a single net figure.
Consider this example:
|
Transaction |
Amount |
|
Gross sales |
$10,000 |
|
Marketplace and payment fees |
$1,200 |
|
Refunds processed |
$500 |
|
Net payout, assuming no other adjustments |
$8,300 |
If the seller records only $8,300 as revenue, the sales figure may be understated and the fees and refunds may not be properly accounted for.
Instead, record gross sales, refunds and marketplace expenses separately, using the appropriate accounting and GST treatment for each transaction. The example illustrates the reconciliation process; actual GST reporting depends on the underlying transactions and supporting records.
Download your marketplace and payment gateway reports monthly. Match the gross transactions, fees, refunds and final payout against your accounting records and bank statement. Investigate differences before preparing your BAS.
This process also helps identify duplicate entries, delayed payouts, chargebacks and unexpected platform charges.
4. What Stock and Inventory Records Should an Online Store Maintain?
Accurate inventory records help sellers understand what they own, what they have sold and how much stock remains available.
Without reliable stock tracking, a business may continue advertising unavailable products, reorder too early or overlook damaged and unsold inventory.
Useful stock records include:
- Product names, SKUs and quantities.
- Opening stock and new purchases.
- Supplier invoices and purchase costs.
- Units sold, returned, damaged or written off.
- Stock transfers between warehouses or locations.
- Closing stock and stocktake adjustments.
For businesses holding physical inventory, regular stock checks help identify differences between the accounting system and actual quantities.
For example, an online homewares retailer in Melbourne may show 150 units of a product in its inventory software. A physical stocktake finds only 137 units. The difference could reflect damaged products, unrecorded returns, picking errors or theft.
Investigating the discrepancy helps correct inventory records and improve purchasing decisions.
Stock valuation also matters at the financial year-end because trading stock can affect taxable business income. The appropriate valuation method and any simplified small-business rules depend on eligibility and the applicable tax requirements. Keep supporting records and confirm the correct treatment with a qualified tax professional.
5. How Should Sellers Record Refunds, Returns and Discounts?
Refunds and returns affect more than customer satisfaction. They can also change reported sales, inventory balances and GST calculations.
For every refund, retain the original order reference, refund date, amount returned and reason for the transaction. Where a product comes back into stock, update inventory records to reflect whether it is available for resale, damaged or unsaleable.
Discounts should also be recorded accurately. A promotional discount applied before a sale is completed may affect the amount on which GST is calculated. A refund or adjustment after the original transaction may require a different accounting treatment.
For instance, if a customer returns an appliance after receiving a faulty unit, the seller should record the refund and determine whether the returned appliance can be resold. The business should also review any GST adjustment required for the original sale.
Keeping the original transaction and its adjustment connected makes the audit trail easier to follow.
6. What Bookkeeping Mistakes Should Online Sellers Avoid?
Several common mistakes can make GST reporting and financial management unnecessarily difficult.
Recording net payouts as sales: This can hide marketplace expenses and make revenue figures inaccurate.
Claiming GST credits without checking evidence: Not every expense includes GST, and a business must meet the applicable requirements before claiming a credit.
Ignoring chargebacks and refunds: These transactions can create differences between sales reports, payment statements and bank deposits.
Failing to reconcile inventory: Unexplained stock differences can affect purchasing decisions and year-end reporting.
Mixing personal and business transactions: Separate business banking makes it easier to identify legitimate expenses and maintain clear records.
Leaving reconciliation until BAS is due: Rushed bookkeeping increases the risk of missed transactions, incorrect GST codes and incomplete supporting documents.
If the ATO asks questions about your reported figures, organised invoices, transaction reports and reconciliations can help you explain how those figures were calculated. Understanding common ATO audit triggers can also help business owners recognise why consistent reporting and reliable records matter.
An audit or review does not automatically mean wrongdoing has occurred. Clear documentation simply makes it easier to respond accurately if the ATO requests information.
7. How Can Online Sellers Simplify GST and Inventory Bookkeeping?
You do not need a complicated finance system to establish good bookkeeping habits. The key is to create a repeatable process and follow it consistently.
Start with these practical steps:
- Connect your sales channels: Where supported, integrate Shopify, Amazon, eBay or other platforms with your accounting and inventory software.
- Reconcile monthly: Compare marketplace reports, payment gateway statements and bank deposits.
- Use consistent product codes: Match SKUs across sales, purchasing and inventory records.
- Review GST treatment: Check sales, supplier invoices and marketplace fees before claiming GST credits or preparing BAS.
- Count stock regularly: Investigate discrepancies and document adjustments.
- Store records securely: Keep invoices, reports, receipts and reconciliations organised and accessible.
- Review financial performance: Compare sales, fees, returns and stock costs to understand which products and channels are profitable.
For growing businesses, professional accounting support can help establish better reporting processes and identify issues before they become expensive problems. Businesses looking for Audit and Taxation Services should consider whether their adviser understands e-commerce transactions, marketplace reporting, GST compliance and the practical demands of online retail.
The right support should help you maintain accurate records, understand your obligations and make informed financial decisions—not simply prepare paperwork after the end of the reporting period.
Get Your Online Business Records Ready for Growth
Accurate e-commerce bookkeeping gives Australian online sellers a clearer view of cash flow, product profitability, stock levels and tax obligations. More importantly, it reduces the stress of preparing BAS and responding to questions about business transactions.
If marketplace fees, GST adjustments or inventory discrepancies are becoming difficult to manage, review your bookkeeping process before your next reporting deadline. Speak with an experienced accounting professional about the records your business should maintain and whether tailored Audit and Taxation Services could help strengthen your compliance and reporting processes.
Take action now: organise your sales and stock records, reconcile your latest marketplace payouts, and seek professional advice on any GST or reporting questions you cannot confidently resolve.
Frequently Asked Questions
Do Australian online sellers need to register for GST?
Not every online seller needs to register immediately. GST registration is generally required when GST turnover reaches or is expected to reach $75,000, subject to the relevant rules and exceptions. Sellers should assess their circumstances rather than relying only on their profit or bank deposits.
Can I claim GST on Amazon, eBay or Shopify fees?
Possibly. The answer depends on the fee, whether GST was charged, the supplier documentation and whether the purchase meets the requirements for a GST credit. Review each fee rather than assuming every marketplace charge includes claimable GST.
Should marketplace fees be recorded separately from sales?
Generally, yes. Recording gross sales, refunds and marketplace expenses separately provides a clearer picture of revenue, costs and profitability. It also makes payout reconciliation and BAS preparation easier.
How long should Australian online businesses keep GST records?
Many Australian tax records, including relevant GST records, generally need to be retained for five years. Specific circumstances can affect the required retention period, so businesses should confirm the rules that apply to their records.
