Invoice Template In Australia: GST, BAS & Payment Terms To Include

If you’re running a small business, invoicing can feel like “admin” you squeeze in between actually delivering work, following up leads, and keeping customers happy.

But your invoice isn’t just a payment request. In practice, it’s a record that supports your bookkeeping and tax reporting, helps you get paid faster, and reduces the risk of misunderstandings or disputes.

That’s why having a solid invoice template in Australia your business can rely on is one of the simplest (and most underrated) ways to tighten up your operations. The right template makes it easier to stay consistent, stay compliant, and keep your cashflow steady.

Below, we’ll walk you through what a good invoice template should include in Australia, how GST and BAS can connect to invoicing, and how to write payment terms that protect your business (without making things awkward with customers).

Why Your Invoice Template Matters (It’s More Than A Document)

A consistent invoice template is a practical tool that supports your business day-to-day. It helps you:

• Get paid faster (because customers can see what they owe, when it’s due, and how to pay you)
• Reduce payment disputes (because your scope, rates, and totals are clearly recorded)
• Stay on top of GST and BAS reporting (because the right details are captured from the start)
• Look professional and trustworthy (especially when you’re dealing with larger clients who expect clean documentation)
• Create a paper trail (helpful if a customer challenges the amount, or you need to escalate recovery later)

Even if you have accounting software, the “template” behind your invoices still matters. If your invoices are missing key information (or you’re using inconsistent wording), it can lead to slow payments, confused customers, or compliance headaches.

So when we talk about an invoice template in Australia, we’re really talking about a format that covers both practical and (where relevant) legal essentials.

What To Include In A Template For Invoice Australia Businesses Use

At a minimum, a good invoice template should clearly identify:

• who is charging (you)
• who is being charged (your customer/client)
• what’s being charged (your goods/services)
• how much is being charged (including GST, if relevant)
• when payment is due and how to pay

Here’s a detailed checklist you can use to build or review your invoice template.

1. Your Business Details (Supplier Details)

• Business name (and/or your legal entity name if different)
• ABN
• Registered address (often optional, but useful)
• Email and phone (so the customer can quickly query issues)

Tip: make sure your invoice shows the correct “seller” identity. If you operate through a company but invoice under your personal name (or a different entity), it can confuse customers and complicate record-keeping.

2. Your Customer’s Details

• Customer name (individual or business)
• Customer address (or at least suburb/state if that’s your usual practice)
• Contact person (helpful for B2B, where accounts payable is different to the person who engaged you)

If you’re invoicing businesses, accuracy matters. Many payment delays happen simply because the invoice is addressed to the wrong entity, or doesn’t match the customer’s internal approval requirements.

3. A Unique Invoice Number And Invoice Date

• Invoice number (unique and sequential is best practice)
• Invoice date

This helps you track what’s been paid, what’s overdue, and what relates to which job or purchase order. It also helps your bookkeeping and BAS reporting stay clean.

4. A Clear Description Of Goods/Services

Your invoice should describe what you’re charging for in plain language. Depending on your business, this might include:

• Item/service name
• Quantity or hours
• Rate (e.g. hourly rate, unit price)
• Date range of work performed
• Job reference number or purchase order number (if applicable)

The clearer you are here, the less likely you are to get pushback like “we didn’t approve this” or “this doesn’t match the quote.”

5. Amount Payable (Subtotal, GST, Total)

This is where many invoice templates fall short. Your template should display:

• Subtotal (before GST)
• GST amount (if you charge GST)
• Total amount payable (including GST)

If you’re not registered for GST, you generally shouldn’t charge GST, and you should be careful about labelling the document as a “tax invoice” (more on that below). It’s still a valid invoice, but the way you label it matters.

It also helps to clearly state whether your prices are “GST inclusive” or “GST exclusive” in your quote and/or invoice format, so you don’t accidentally undercharge or create customer confusion. Pricing clarity is especially important when you advertise or provide estimates, and it’s worth aligning with the approach you take in your broader pricing communications (for example, whether you show amounts as GST included or excluded).

For a deeper breakdown of how businesses typically describe prices, GST included or not is a useful reference point.

6. Payment Instructions And Due Date

• Payment due date (or payment timeframe, like “7 days”)
• How to pay (bank details, card link, etc.)
• Reference to include (e.g. invoice number)

This seems simple, but it’s one of the biggest drivers of faster payment. If you make it easy for a customer to pay you in 30 seconds, you’re far more likely to be paid on time.

7. “Tax Invoice” Label (When Needed)

In Australia, the label “tax invoice” is tied to GST. Generally, if you’re registered for GST and you’re making a taxable supply, you’ll need to provide a tax invoice within the required timeframe (and it must include specific information).

Many businesses build this into an invoice template in Australia by using a clear heading at the top, for example:

• Tax Invoice (where GST applies and you’re registered)
• Invoice (where GST does not apply)

However, the exact ATO requirements can vary depending on factors like the value of the sale and the kind of supply, and there are specific content rules for tax invoices. If you want a practical checklist, ATO tax invoice requirements is a helpful starting point.

GST And BAS: How Your Invoices Should Support Tax Reporting

Even if you have a bookkeeper or accountant, your invoicing process directly affects how smooth your GST and Business Activity Statement (BAS) reporting will be.

Just a note: the information below is general only and isn’t tax or accounting advice. GST and BAS obligations can be nuanced depending on your business and the type of supply you make, so it’s important to check the ATO guidance and/or speak with your accountant for advice tailored to your situation.

In simple terms:

• Your invoices record your sales (and GST collected, if applicable)
• Your supplier bills record your expenses (and GST credits you may be entitled to claim)
• Your BAS is where you report these totals for the period

Do You Need To Charge GST On Your Invoices?

Whether you charge GST depends on whether you’re registered for GST and whether the supply is taxable.

As a general guide:

• If you’re registered for GST, you’ll usually add GST to taxable sales and issue tax invoices that meet ATO requirements.
• If you’re not registered for GST, you generally don’t add GST and you should avoid describing the invoice as “GST inclusive” or “tax invoice”.

GST registration can depend on your turnover and your business circumstances, so if you’re unsure, it’s worth confirming with your accountant or the ATO.

How BAS Links Back To Invoicing

A common issue for small businesses is having “messy” invoicing that makes BAS time harder than it needs to be. This can happen when:

• invoices don’t clearly show whether GST was charged
• the ABN is missing
• the invoice date is unclear (so it’s hard to assign it to the right BAS period)
• the description is too vague (so it’s hard to match to the job/contract)

A strong invoice template fixes these issues at the source. It makes your reporting cleaner and reduces the chance of avoidable mistakes that you have to unwind later.

Credit Notes And Adjustments (Don’t Ignore These)

If you need to correct an invoice (for example, you overcharged, a customer returned goods, or you agreed to discount after the fact), you’ll usually want a consistent approach, such as issuing:

• a credit note (reducing the amount payable), or
• a revised invoice (with a clear reference to the original)

This matters for GST and BAS because adjustments can affect what you report and when.

Payment Terms To Put In Your Invoice Template (So You Actually Get Paid)

Your invoice isn’t the only place your payment terms should appear (your quote, proposal, or customer contract usually matters even more), but your invoice should still reinforce the key points.

Here are payment terms that are commonly included in an effective invoice template.

1. Payment Timeframes

Make the due date unmissable. For example:

• Payment due: 7 days from invoice date
• Payment due: 14 days from invoice date
• Payment due: on receipt (often used for smaller jobs or first-time customers)

If you work with larger businesses, check whether they impose their own payment cycle (for example, “end of month” terms). If they do, you’ll want to reflect agreed terms in writing, ideally before you start work.

If you want to tighten your approach, it helps to align your invoicing with a set of Terms of Trade, so customers know the rules from the beginning.

2. Accepted Payment Methods

List the payment methods you accept, such as:

• bank transfer (include BSB/account number)
• credit/debit card (if you have a payment link)
• direct debit (where appropriate)

If you use direct debit, make sure you’re doing it properly and getting the right customer authorisations. This is an area where businesses can accidentally create compliance issues, so it’s worth understanding the basics of direct debit laws.

3. Deposits And Progress Payments

If you take deposits or charge in stages (common for builders, designers, consultants, and project-based services), your invoice template can support this by clearly showing:

• the deposit amount
• what the deposit relates to
• the remaining balance
• milestones for progress payments (if applicable)

This reduces disputes about what’s already been paid and what’s still owed.

4. Late Fees And Interest (If You Want To Enforce Them)

Many businesses include a late fee clause on invoices, but there’s an important catch: a term is much easier to enforce if it was agreed upfront, not introduced only after the customer has already accepted your work.

In other words, if you want to charge late fees, it’s best to bake them into your customer terms (and then reflect them on the invoice).

Whether late fees are appropriate (and how to word them) can depend on your customer type and how you sell, but as a starting point it’s worth understanding charging late fees on invoices.

5. What Happens If There’s A Dispute?

Even with the best processes, disputes happen. Your invoice can include a short, calm line such as:

• “If you have any questions about this invoice, please contact us within 7 days.”

This doesn’t replace a contract clause, but it encourages customers to raise issues early (before the invoice becomes seriously overdue).

Common Invoice Template Mistakes (And How To Avoid Them)

Most invoice problems aren’t caused by bad intent. They’re caused by rushed admin, copied templates, or inconsistent practices as your business grows.

Here are common mistakes we see, and what to do instead.

Mistake 1: Issuing “Tax Invoices” When You’re Not Registered For GST

If you’re not registered for GST, avoid using “Tax Invoice” as the heading and avoid showing GST amounts on the invoice.

If you later register for GST, you can update your invoice template at that time (and make sure your accounting system is set up properly too).

Mistake 2: Missing Or Incorrect ABN/Entity Name

If your invoice has the wrong ABN, or it’s unclear which legal entity is providing the goods/services, you can create unnecessary friction with customers (and sometimes, delays in approval).

This often happens when a business changes structure (for example, from sole trader to company) but keeps using an old invoice template.

Mistake 3: Unclear Scope Or Vague Line Items

A single line item like “services rendered” might be quick to write, but it’s not great if there’s ever a dispute about what was included.

Instead, add enough detail that a third party could understand what was delivered (without you having to explain it later).

Mistake 4: Payment Terms That Conflict With Your Quote Or Contract

Your invoice should reflect what you agreed with the customer. If your quote says “14 days” but your invoice says “7 days,” you’re more likely to get pushback (and you may weaken your position if you ever need to escalate recovery).

It’s a good habit to set your payment rules once and apply them consistently. If you need help formalising the legal side of this, setting invoice payment terms is a sensible place to start.

Mistake 5: Forgetting About Consumer Law (Especially If You Sell To Individuals)

If you sell goods or services to consumers, you’ll also want to be mindful of your obligations under the Australian Consumer Law (ACL). For example, invoicing shouldn’t include misleading statements about “no refunds” where consumer guarantees apply.

If you sell products with warranties or guarantees, it’s worth understanding your obligations around things like warranties and returns. A practical reference point is Australian Consumer Law warranty.

Key Takeaways

• A reliable invoice template in Australia should clearly show your business details, your customer’s details, what you’re charging for, and exactly how and when payment is due.
• If you’re registered for GST and charging GST, your invoice should meet tax invoice requirements (which can vary depending on the transaction), including showing GST and your ABN.
• Your invoices should be set up to support BAS reporting, with clear dates, descriptions, and GST treatment to keep your bookkeeping clean.
• Payment terms matter: specify due dates, payment methods, and (where appropriate) rules for deposits and late payments.
• To reduce disputes, keep invoice wording consistent with your quotes and contracts, and avoid vague descriptions or conflicting terms.

If you’d like help tightening up your invoicing terms or putting the right documents in place for your business, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.