No, you should not add GST to your invoice unless your business is registered for GST with the Australian Taxation Office. Registration is mandatory when your annual turnover reaches $75,000 ($150,000 for non-profit organisations). Below that threshold, registration is optional.

If you are not registered, your invoices must not include a GST line and must not be labelled "Tax Invoice." If you are registered, you must charge 10% GST on taxable sales, issue compliant Tax Invoices, and lodge Business Activity Statements (BAS) with the ATO.

This guide covers the invoicing rules for both scenarios, the difference between a tax invoice and a regular invoice, whether you can legally quote prices without GST, common mistakes, and how GST registration changes your insurance position.

TL;DR

• Registration Lock: You can only charge or display GST if you hold an active GST registration with the ATO. If not registered, your invoices must not include GST and must not use the words "Tax Invoice."
• Consumer Pricing Rules: When quoting consumers (B2C), your displayed price must be the final cost inclusive of GST under Australian Consumer Law. Stating a base price with "plus GST" added separately is not permitted for consumer-facing pricing.
• B2B Exception: When quoting other businesses (B2B), you can state prices as "plus GST" or "excluding GST."
• The Procurement Trigger: Crossing the $75,000 threshold means issuing compliant Tax Invoices and dealing with commercial clients who commonly require $10 million or $20 million in public liability cover before signing a service agreement.
• The Tax Offset: Once GST-registered, you can typically claim back the 10% GST included in your business insurance premiums as an Input Tax Credit on your BAS.

What Are the Rules for GST on Invoices and Quotes?

How you display GST on quotes and invoices is not just an accounting choice. It is a legal compliance issue governed by the Australian Competition and Consumer Commission (ACCC) under Australian Consumer Law.

Quoting consumers (B2C): the single price rule

When you advertise or quote a price to an individual consumer, Australian Consumer Law requires you to show a GST-inclusive "single price." The single price is the total amount the customer will pay, including GST and any other mandatory charges. It must be at least as prominent as any ex-GST component you display.

In practice, this means you cannot advertise "$100 plus GST" to a consumer without also showing the $110 total at least as prominently. Hiding the GST component in fine print or footnotes is a breach of the component pricing rules.

Quoting other businesses (B2B): the exception

The single price rule generally does not apply to transactions between businesses. When quoting another registered business, you can state prices as "plus GST" or "excluding GST." This is standard practice in commercial contracting, wholesale, and procurement.

If you work across both B2C and B2B, apply the correct pricing format for each audience. Consumer-facing quotes must show the GST-inclusive total. Business-facing quotes can show the ex-GST amount.

When Are You Required to Register for GST?

The $75,000 mandatory threshold

You must register for GST if your annual GST turnover reaches $75,000. Turnover is calculated over any rolling 12-month period, not just the financial year. It is based on your gross business income before expenses, not your net profit.

The "projected turnover" 21-day trap

There is an important timing rule most sole traders miss: if you reasonably expect your turnover to reach $75,000 in the current month, you must register within 21 days. You do not have to wait until you actually cross $75,000. The ATO refers to this as your "projected GST turnover."

If you fail to register on time, the ATO can backdate your GST obligations. This means you may owe GST on sales you have already invoiced and collected without charging tax. That amount comes out of your own pocket. Monitoring your rolling 12-month turnover monthly is the simplest way to avoid this.

Non-profit organisations

If you operate a registered non-profit organisation or charity, the GST registration threshold is $150,000 per year, not $75,000. The same rolling 12-month calculation applies.

Voluntary registration below $75,000

You can choose to register for GST even if your turnover is below $75,000. There are trade-offs to consider before opting in:

Reasons to register early:

• You can claim Input Tax Credits (ITCs) on the GST included in business purchases, including insurance premiums, tools, software, and materials.
• Displaying an active GST registration can make your business appear more established to commercial clients and procurement teams.
• If you are close to the $75,000 threshold, registering early avoids the risk of missing the 21-day deadline.

Reasons to wait:

• You must add 10% GST to all taxable sales, which increases your prices for consumers who cannot claim the GST back.
• You take on the administrative obligation of lodging Business Activity Statements (BAS) with the ATO, either monthly, quarterly, or annually.
• If most of your clients are individual consumers rather than GST-registered businesses, the price increase may affect your competitiveness.

For more on GST registration timing, see upcover's guide on when you need to register for GST.

What Is the Difference Between a Tax Invoice and a Regular Invoice?

This is the distinction most sole traders get wrong. The two documents have different rules, different labels, and different legal consequences.

The 28-day rule

A GST-registered seller must provide a valid Tax Invoice within 28 days of a customer's request. This is the ATO's deadline for delivering the document itself. It is not a payment term. Your payment terms (7 days, 14 days, 30 days) are separate and set by you.

Record keeping

All invoices, whether tax or regular, must be kept for at least 5 years per ATO requirements. This applies to both the invoices you issue and the invoices you receive from suppliers.

Common GST Invoicing Mistakes Sole Traders Make

Five errors that come up regularly:

1. Charging GST when not registered: If you are not GST-registered and you add a 10% GST line to your invoice, you are collecting tax you have no authority to collect. This is a breach of tax law.
2. Labelling a regular invoice as "Tax Invoice": If you are not GST-registered, your invoice must not include the words "Tax Invoice." Using the wrong label can mislead your customer and create problems with their BAS reporting.
3. Not registering after crossing $75,000: If your rolling 12-month turnover exceeds $75,000 and you have not registered, you are operating in breach of your GST obligations. The 21-day rule applies from the moment you reasonably expect to reach the threshold.
4. Issuing a Tax Invoice without showing the GST amount: A valid Tax Invoice must show the GST for each item separately, or include a statement that the total price includes GST. Missing the GST detail means the invoice is not valid for your customer's Input Tax Credit claim.
5. Not keeping records for 5 years: The ATO requires you to retain all business records, including invoices, for at least 5 years. Failing to do so can result in penalties during an audit.

The Sham Contracting Trap

Some businesses ask workers to get an ABN and invoice as contractors to avoid paying employment entitlements. If someone controls your hours, provides your tools, sets your rate, and directs how you do the work, you are likely an employee, not a contractor, regardless of whether you hold an ABN.

Under the Fair Work Act 2009, sham contracting is when an employer deliberately misrepresents an employment relationship as a contracting arrangement to avoid obligations. Those obligations include the superannuation guarantee (12% of all ordinary time earnings from the first dollar, with no minimum earnings threshold) and other entitlements like leave, PAYG withholding, and workers' compensation.

The ATO and the Fair Work Ombudsman actively investigate sham contracting arrangements. If you believe your work arrangement has been misrepresented, you can report it directly.

For more on this topic, see upcover's guide on ABN and working holiday visas, which covers the sham contracting issue in detail.

How Does Crossing $75K Change Your Insurance Needs?

The $75,000 GST threshold is not just a tax milestone. In practice, it marks the point where your business starts dealing with larger clients, commercial contracts, and formal procurement processes.

The procurement trigger

Commercial clients who require formal Tax Invoices commonly also require a minimum of $10 million or $20 million in public and products liability insurance before signing a service agreement. A valid Certificate of Currency is often a condition of the contract alongside the Tax Invoice. If you cannot produce both, you may not be able to invoice the client at all.

Professional indemnity for advisory work

If your business provides professional advice, consulting, design, or instructional services at this revenue level, professional indemnity insurance may also be relevant. PI may help cover claims arising from alleged negligence in your professional services, subject to policy terms.

The Input Tax Credit on your insurance premiums

Once GST-registered, your business insurance premiums include a 10% GST component. You can typically claim this GST back as an Input Tax Credit on your BAS lodgement.

For example, if your annual public liability premium is $1,100 (including $100 GST), you claim the $100 back on your next BAS. This reduces your effective insurance cost to $1,000. The same applies to professional indemnity, business pack, and commercial motor premiums. Confirm the specific ITC treatment with your registered tax agent, as the amount claimable depends on how the policy relates to your taxable business activities.

upcover arranges public liability, professional indemnity, and business pack insurance for sole traders across Australia, with access to 80+ insurance partners. A Certificate of Currency is issued instantly on policy confirmation, so you can attach it to your next commercial quote or tender. Get a quote through upcover's sole trader insurance page.

FAQ

Do I need to add GST to my invoice?

Only if your business is registered for GST with the ATO. Registration is mandatory when your annual turnover reaches $75,000. If you are not registered, your invoices must not include a GST line and must not use the words "Tax Invoice."

Do I need to include GST on my invoice if I'm not registered?

No. If you are not GST-registered, your invoices should show the price without GST and should be labelled "Invoice," not "Tax Invoice." Adding GST to an invoice when you are not registered is a breach of tax law.

Is it legal to quote prices without GST?

It depends on who you are quoting. When quoting consumers (B2C), Australian Consumer Law requires you to show a GST-inclusive single price. When quoting other businesses (B2B), you can show prices as "plus GST" or "excluding GST."

What is the difference between a tax invoice and a regular invoice?

A tax invoice is issued by GST-registered businesses and must include the words "Tax Invoice," your ABN, and the GST amount for each item (or a statement that the total includes GST). A regular invoice is issued by businesses not registered for GST and must not include GST or the "Tax Invoice" label.

Can I claim back the GST on my business insurance premiums?

If your business is GST-registered, you can typically claim the 10% GST component of your insurance premium as an Input Tax Credit on your BAS. For example, $100 GST on a $1,100 premium is claimable. Confirm the specific treatment with your registered tax agent.

What does "inclusive of GST" mean?

A price described as "inclusive of GST" means the total amount shown already includes the 10% GST component. The buyer pays that amount with no additional GST added on top. For a $110 GST-inclusive price, $100 is the base amount and $10 is the GST.

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_{The information in this article is general in nature and provided for informational purposes only. It does not constitute personal tax, legal, or insurance advice. References to GST thresholds, tax invoice requirements, Australian Consumer Law, the Fair Work Act, and superannuation rates are based on publicly available information currently at the time of writing and may change. Always confirm the current position with the Australian Taxation Office, the ACCC, and the Fair Work Ombudsman. All insurance products arranged through upcover are subject to the terms, conditions, limits and exclusions contained in the relevant policy wording and Product Disclosure Statement. Before deciding whether a particular insurance product is right for you, please read the relevant PDS and consider your personal circumstances. upcover Pty Ltd ABN 17 628 197 437 is a Corporate Authorised Representative (CAR 1299211) of Experience Insurance Services Pty Ltd ABN 41 657 596 506, AFSL 539078. upcover arranges insurance products with selected insurers and underwriters and does not compare all general insurers or insurance products available in the market.}