The Hidden Tax Mistakes E-Commerce Sellers Make (And How to Avoid Them)
By The Aussie Accounting Team | Business Tax Services & Ecommerce Accounting Specialists
Key Takeways
- GST registration is required once turnover reaches $75,000 (not profit) across all platforms
- E-commerce sellers often mismanage multi-platform revenue reconciliation, causing reporting errors
- Imported stock may trigger GST and customs obligations, requiring proper documentation to claim credits
- Many businesses overpay tax by missing legitimate deductions like ads, software, shipping, and fees
- Incorrect timing of income and expenses (cash vs accrual accounting) can distort tax outcomes
- Scaling businesses can face unexpected payroll tax obligations once wage thresholds are exceeded
- Lack of tax planning leads to EOFY cash flow shortages and ATO payment stress
- Setting aside 25–30% of profit for tax helps avoid financial pressure
- The ATO uses data matching from platforms like eBay and Amazon, increasing compliance scrutiny
- Regular bookkeeping (weekly or monthly) is essential to stay compliant and maximise deductions
- Specialist ecommerce accounting services help reduce risk and improve tax efficiency
Australia’s e-commerce sector is booming. According to Australia Post’s 2024 eCommerce Industry Report, online shopping now accounts for more than $63 billion in annual consumer spending — and that number is climbing. But behind every thriving online store is a tax obligation that far too many sellers don’t fully understand until they’re staring down an unexpected ATO bill.
Whether you’re selling on Shopify, Amazon Australia, eBay, Etsy, or through your own WooCommerce site, the rules around GST, income tax, and business deductions for online sellers are more nuanced than most people realise. The mistakes are common — and they’re costly.
At The Aussie Accounting, we deliver specialist ecommerce accounting services to online sellers across Australia every day. In this guide, we break down the seven most damaging tax mistakes e-commerce sellers make, back them with real data, and show you exactly how to avoid them.
- E-Commerce Tax: The Numbers You Need to Know
63 billion AUD — Australia’s 2024 online retail market size (Australia Post). 75,000 AUD — GST registration threshold for Australian businesses. 1 in 3 small businesses in Australia are non-compliant with at least one ATO tax obligation (ATO 2023 compliance report). Up to 25% of business income should be set aside for tax by sole trader ecommerce sellers.
Mistake #1: Failing to Register for GST at the Right Time
The GST registration threshold in Australia is $75,000 in annual turnover. For e-commerce sellers with a product that takes off, this can be reached faster than expected — and missing the deadline creates a backdated liability that you’ll pay out of your own pocket.
Critically, turnover means gross revenue — not profit. Every dollar that enters your PayPal, Stripe, or bank account from sales counts, regardless of your expenses or margins. Sellers on multiple platforms frequently underestimate this by failing to aggregate revenue across all channels.
- The Fix
Check your rolling 12-month turnover at the end of every single month. The moment you look likely to exceed $75,000, register for GST immediately — do not wait for EOFY. Acting early protects you from back-liability and avoids penalties.
Mistake #2: Miscategorising Revenue Across Multiple Platforms
Many sellers operate simultaneously across Shopify, eBay, and Amazon. Each platform has a different payment schedule and fee structure, and each deposits funds differently. Without a proper ecommerce accounting system, it’s extremely easy to double-count revenue, misclassify fees as income, or miss refunds entirely.
| Platform | Fee Structure | Common Accounting Error |
|---|---|---|
| Shopify | Monthly subscription + 0.5–2% transaction fee | Counting gross sales without netting platform fees |
| Amazon Australia | Referral fee 6–15% of sale price | Treating net deposits as gross revenue |
| eBay | Final value fee ~13.9% + listing fees | Missing refunds and returns in reconciliation |
| Etsy | 6.5% transaction fee + listing fee | Double-counting Stripe and Etsy payouts |
| WooCommerce | Variable: gateway fees (Stripe/PayPal ~1.75%) | Conflating PayPal withdrawals with actual sales |
- The Fix
Use Xero or QuickBooks with a dedicated integration such as A2X, which pulls Shopify and Amazon settlements cleanly into your accounting file — separating fees, refunds, and net income automatically. A bookkeeper with genuine ecommerce accounting services experience can configure this in a single session.
Mistake #3: Missing GST Obligations on Imported Stock
Since July 2018, the ATO extended GST rules to overseas suppliers — but Australian sellers who import goods still frequently mishandle the GST treatment on their own BAS. Many confuse customs duty with GST, or incorrectly claim input tax credits on imports.
The rule is straightforward: goods imported into Australia with a customs value over AUD $1,000 are subject to GST (and potentially customs duty) at the border, collected by the ATO and the Australian Border Force. Goods under $1,000 should have GST collected by the overseas vendor — but this doesn’t mean you’re off the hook for accounting for it correctly.
- Watch Out
If you’re registered for GST and importing business stock, you may be able to claim a GST credit on the import — but only if you have a valid tax invoice or customs entry document. Missing this paperwork means leaving money on the table every quarter.
Mistake #4: Overlooking Deductions You Are Legally Entitled To
This is the other side of the tax mistake coin. While some sellers underpay tax through non-compliance, many equally overpay because they miss legitimate deductions. The ATO permits a broad range of expenses for e-commerce businesses — and most sellers claim only a fraction of what they are owed.
Commonly Missed E-Commerce Deductions:
- Shopify, WooCommerce, Etsy, and marketplace subscription fees
- Payment gateway fees — Stripe (1.75%), PayPal, Afterpay merchant fees
- Packaging materials, custom mailer boxes, tissue paper, branded inserts
- Postage, courier costs, and Click & Collect fulfilment expenses
- Product photography — equipment, props, editing software (Adobe, Canva Pro)
- Home office running costs (electricity, internet — using ATO fixed rate method: 70c/hour in 2024–25)
- Google Ads, Meta Ads, TikTok advertising spend
- Business-related courses, webinars, and professional development
- Accounting and bookkeeping fees — including ecommerce accounting services
- Depreciation on computers, camera equipment, and storage shelving
- The Fix
Open a dedicated business bank account and business credit card from day one. Never mix personal and business spending. Your bookkeeper or accountant will categorise every transaction correctly — ensuring nothing is missed at tax time.
Mistake #5: Getting the Timing of Income and Expenses Wrong
Cash basis vs. accrual basis accounting is a distinction that trips up many online sellers — particularly when they receive pre-orders in June, or make a large inventory purchase close to the end of the financial year.
| Scenario | Common Mistake | Correct Treatment |
|---|---|---|
| Customer pre-pays in June, ships in July | Not declaring as June income | Income recognised on receipt (cash basis) |
| Large equipment purchased in May | Claiming full cost in one year | Depreciate over effective life unless instant asset write-off applies |
| Supplier invoice received, not yet paid | Claiming expense before payment | Only deductible when paid (cash basis) |
| Annual software subscription paid upfront | Claiming full amount immediately | May need to apportion across the period covered |
- The Fix
Choose cash or accrual basis with your accountant’s guidance and apply it consistently. The ATO’s Temporary Full Expensing provisions have changed — always verify the current instant asset write-off threshold before making capital purchases near EOFY.
Mistake #6: Ignoring Payroll Tax When Hiring Staff
As an e-commerce business grows, sellers often bring on customer service staff, warehouse pickers, or virtual assistants. What many don’t realise is that payroll tax is a state and territory-based obligation that kicks in once annual wages exceed a certain threshold — and those thresholds vary considerably across Australia.
| State / Territory | 2024–25 Payroll Tax Threshold | Tax Rate |
|---|---|---|
| New South Wales | $1,200,000 | 5.45% |
| Victoria | $700,000 | 4.85% |
| Queensland | $1,300,000 | 4.75% |
| Western Australia | $1,000,000 | 5.5% |
| South Australia | $1,500,000 | 4.95% |
| Tasmania | $1,250,000 | 6.1% |
| ACT | $2,000,000 | 6.85% |
| Northern Territory | $1,500,000 | 5.5% |
Critically, grouping provisions mean that if you operate multiple related entities (e.g., a main e-commerce company and a separate warehousing entity), the ATO groups their wages together for threshold purposes — catching many multi-entity sellers off guard.
- The Fix
The moment your wage bill approaches $600,000 annually across all related entities, commission a payroll tax review. This is a core component of business tax services for scaling ecommerce businesses — and proactive advice costs a fraction of what penalties do.
Mistake #7: No Tax Planning — and Getting Blindsided at EOFY
This is the most painful mistake of all, and also the most preventable. E-commerce sellers — particularly sole traders — often reinvest every dollar back into stock and advertising. When the tax bill arrives in October or November, there’s nothing left to pay it with.
Unlike employees, sole traders have no automatic PAYG withholding. Once your annual tax liability exceeds $1,000, the ATO will issue PAYG instalment notices — quarterly prepayments toward next year’s expected tax. Many sellers are blindsided by this, treating it as an unexpected new bill rather than what it actually is: tax they already owe.
- The Simple Tax Savings Rule
Set aside 25–30% of every dollar of net profit into a separate, dedicated tax savings account from day one. Treat it as untouchable. Your accountant will calculate the precise PAYG instalment amount each quarter — but this buffer means you’ll never be caught short.
Quick Reference: 7 Mistakes at a Glance
| # | The Mistake | The Fix | Risk Level |
|---|---|---|---|
| 1 | Not registering for GST on time | Track rolling 12-month turnover monthly | High |
| 2 | Miscategorising multi-platform revenue | Use Xero + A2X integration | Medium |
| 3 | Missing GST on imported stock | Match import docs to BAS claims | Medium |
| 4 | Missing legitimate deductions | Separate bank account + professional bookkeeper | Medium |
| 5 | Wrong timing of income/expenses | Pick cash or accrual — apply consistently | High |
| 6 | Ignoring payroll tax as you scale | Payroll tax review when wages approach $600K | High |
| 7 | No tax planning throughout the year | Save 25–30% of profit; set up PAYG instalments | Very High |
Why Specialist Ecommerce Accounting Services Matter
Generic accounting firms are built for brick-and-mortar businesses. E-commerce operations — with their multi-platform revenue streams, international suppliers, digital advertising complexity, and inventory management — require a different level of expertise.
Specialist ecommerce accounting services from a firm like The Aussie Accounting means you get accountants who understand Shopify’s payment flow, who know how to reconcile Amazon FBA fees, and who can identify the deductions your business is entitled to claim — not just the generic ones.
- Serving E-Commerce Sellers Across All of Australia
The Aussie Accounting provides ecommerce accounting services to online sellers in Sydney, Melbourne, Brisbane, Perth, Adelaide, and every postcode in between. Our fully digital engagement model means location is never a barrier — we work with you wherever your business operates.
Frequently Asked Questions (FAQ)
You are legally required to register for GST once your business’s annual turnover reaches — or is expected to reach — $75,000. This is gross revenue from all platforms combined, not profit. If you are a non-profit, the threshold is $150,000.
Yes — more than many sellers realise. The ATO operates an active data matching program that receives sales and payment data directly from eBay, Airbnb, and selected payment processors. If the income you report differs materially from what these platforms report, you will receive a review notice.
Absolutely. Shopify subscription fees, app add-ons, domain and hosting costs, and any software used primarily for your business are fully deductible as ordinary business expenses under Section 8-1 of the ITAA 1997.
The ATO requires you to keep business records for a minimum of five years. This includes: sales records and platform settlement reports (Shopify, Amazon, eBay), purchase and supplier invoices, bank and PayPal statements, records of all business-related expenses, and any import/customs documentation.
GST (10%) is collected from your customers on taxable sales and remitted to the ATO quarterly or monthly via your Business Activity Statement (BAS). It is not your money — it passes through your business. Income tax is levied on your actual net business profit and is assessed annually via your tax return. Both obligations apply independently.
Ideally, every week — or at a minimum, monthly. Leaving bookkeeping until EOFY significantly increases the risk of missed deductions, incorrect BAS lodgements, and compliance errors. Monthly reconciliation also gives you real-time visibility into your store’s profitability, helping you make smarter inventory and advertising decisions.
If your turnover is well below $75,000 and your business model is simple, accounting software with good templates may suffice for the short term. However, from the moment you approach the GST threshold, carry inventory, employ anyone, or import goods — professional ecommerce accounting services will save you significantly more than they cost.
Final Word: Don't Let Tax Mistakes Cost You Your Business
The Australian e-commerce opportunity has never been greater — but neither has the complexity of operating compliantly within it. GST obligations, multi-platform revenue, deduction entitlements, payroll tax, and EOFY planning are not set-and-forget matters. They require ongoing attention from professionals who understand how online businesses actually work.
The Aussie Accounting delivers specialist ecommerce accounting services, business tax services, and bookkeeping solutions built specifically for Australian online sellers — from first-time sole traders to multi-channel operators turning over millions. Our team stays on top of every ATO change so you don’t have to.
- Ready to Get Your Ecommerce Tax Right?
Contact The Aussie Accounting today at theaussieaccounting.com.au for a free initial consultation. We’ll review your current setup, identify what you might be missing, and build a compliance and tax strategy that works for your business — year round.