Goods and Services Tax (GST) is a 10% tax on most goods and services sold in Australia.
For retail shop owners, understanding when you must register for GST is critical to avoid penalties.
Many new business owners mistakenly believe they can wait until they are 'profitable' — but the rules are based on turnover, not profit.
This guide explains exactly when GST registration becomes compulsory, how to calculate your threshold, and what happens if you register voluntarily.
1. The $75,000 Gross Income Threshold (Core Rule)
Under the A New Tax System (Goods and Services Tax) Act 1999, you must register for GST if your business has a current annual turnover (or an estimated future turnover) of $75,000 or more.
Key definition: 'Turnover' means your total business income (excluding GST collected, but including all sales, government grants, and some asset sales). It is NOT your profit after expenses.
- Current turnover: If you have already been operating for 12 months and your total sales exceeded $75,000, you must register within 21 days of becoming aware.
- Projected turnover: If you are starting a new shop and realistically expect to exceed $75,000 in your first year of operation, you must register before that happens.
2. Special Rules for Retail Shops (Non-Profit vs. For-Profit)
- Standard retail shops (for-profit): Threshold is $75,000.
- Non-profit retail shops: Threshold is much higher — $150,000.
- Taxi or ride-sourcing drivers (including Uber): Must register for GST regardless of turnover — even if you earn only $5,000 a year. This includes shop owners who also deliver goods via taxi or Uber.
3. How to Calculate Your Turnover Correctly
Many retail shop owners miscalculate because they exclude certain income. For GST purposes, your turnover includes:
- All cash and credit card sales from your shop counter.
- Online sales (including Shopify, eBay, Amazon, or your own website).
- Deposits and lay-by payments received (when received, not when goods are delivered).
- Gift voucher sales (at the time of sale, not redemption).
- Government grants (e.g., COVID-19 business support payments).
- Sales of shop equipment or fixtures (unless it was for private use).
Critical point: You do NOT include GST collected in your turnover calculation. For example, if you sold a $110 item (including $10 GST), your turnover contribution is $100.
4. What Happens If You Don't Register on Time?
Failing to register when mandatory results in serious consequences:
- Backdated liability: The ATO will deem you registered from the date you should have registered. You will owe GST on all sales from that date.
- Penalties: Up to 75% of the GST owed, plus interest (GIC — General Interest Charge, currently around 11% per annum).
- No input tax credits: You cannot claim GST credits on your purchases for the period you were unregistered.
5. Voluntary Registration (When You Are Below $75,000)
If your retail shop earns less than $75,000, registration is optional. However, there are strategic reasons to register voluntarily:
- Claim back GST on start-up costs: Fit-out, shelving, signage, first inventory purchase — you can claim the 10% GST included in these costs.
- Appear more professional: Other businesses (especially B2B customers) prefer to deal with GST-registered suppliers so they can claim their own credits.
- Fuel tax credits: Registration allows you to claim credits for fuel used in business vehicles.
Once you register voluntarily, you must stay registered for at least 12 months and lodge BAS statements regularly.
6. Step-by-Step Registration Process
- Log into myGov linked to the ATO.
- Select 'Register a new business' or 'Add a new tax role' to your existing ABN.
- Provide your estimated turnover and intended GST reporting cycle (monthly, quarterly, or annually — most retail shops choose quarterly).
- You will receive confirmation within 1-2 business days.
In summary, monitor your turnover monthly. If you cross $75,000 (even briefly), register immediately.
If you are starting a high-volume shop (e.g., a cafe, clothing boutique, or electronics store), register from day one to claim credits on fit-out costs.