How to Invoice as a Sole Trader in Australia (2026 Guide)

Q: Do sole traders need an ABN to invoice?

Yes. Without an ABN, the client must withhold 47% of the payment under the ATO’s no-ABN withholding rule. ABNs are free at abr.gov.au and approved instantly in most cases. The ABN must appear on every invoice you issue.

Q: Do sole traders charge GST?

Only if registered for GST. Registration is mandatory once your turnover is at or above $75,000 in any 12-month period. Below that, GST registration is optional and most sole traders stay unregistered to keep admin light.

Q: What goes on a sole trader invoice?

Your business or trading name, your ABN, a unique invoice number, the invoice date, the client’s name (and ABN for invoices $1,000+), line items with quantity and rate, GST if registered, payment terms with due date, and your bank details. If you’re GST-registered, the words “Tax Invoice” must appear.

Q: How long do sole traders have to keep invoices?

At least 5 years from the date the record was created or the date of the transaction it relates to, whichever is later. The ATO accepts digital copies. Cloud storage with a backup is the easiest route for sole traders.

Q: Can sole traders charge late fees?

Yes, if the late fee was disclosed in the engagement (terms on the original quote, contract, or website terms) and the rate is reasonable. Typical Australian practice is 1.5% per month or interest at the RBA cash rate plus 2–3%.

Quick answer

As an Australian sole trader, every invoice you send needs your business name, your ABN, a unique invoice number, the date, the client’s name, line items with quantity and rate, GST if you’re registered, a clear due date, and your bank details. GST registration is mandatory only once your turnover hits $75,000 in any 12-month period. Keep every invoice for 5 years. That’s the entire ATO requirement.

What “sole trader” actually means for invoicing

A sole trader is the simplest business structure in Australia — legally you and the business are the same entity. The practical implications for invoicing:

You can invoice under your personal name or a registered trading name (business name). Both are valid. Most sole traders register a trading name with ASIC ($42 for 1 year, $98 for 3 years) so they don’t have to put their personal name on every invoice.
Your ABN is tied to you, not the business name. The same ABN covers every trading name you operate under.
All income from the business flows through your personal tax return. There is no separate company tax return.
Liability is personal — debts and obligations of the business are yours. This is the main reason some sole traders eventually shift to a Pty Ltd structure.

Step 1: Get your ABN

The ABN is non-negotiable. Without it, clients must legally withhold 47% of every payment for the ATO under the no-ABN withholding rule. Apply free at abr.gov.au — approval is usually instant if your information matches the ATO’s records. Full walkthrough in do you need an ABN to invoice?

Step 2: Decide on GST registration

GST registration becomes mandatory the moment your turnover (across the previous 12 months or projected for the next 12) reaches $75,000. Below that, registration is voluntary.

The voluntary registration trade-off:

Pro: you can claim GST credits on business purchases (laptop, software, tools).
Con: you must lodge a BAS every quarter, your prices effectively go up 10% for non-business clients (who can’t claim it back), and you collect GST on behalf of the ATO.

Most sole traders stay unregistered until they cross the threshold. See how to add GST to an invoice and how to invoice without GST for the wording differences on each side.

Step 3: The fields the ATO requires

For a regular invoice (under $1,000 to a private buyer):

Your business or trading name
Your ABN
The invoice issue date
A unique invoice number
A description of each item (with quantity and rate)
The total amount payable in AUD

For a Tax Invoice (i.e. you’re GST-registered), add:

The words “Tax Invoice” on the document
The GST amount on each line or as a total
The buyer’s identity and ABN (if the invoice is $1,000 or more)

Numbering matters more than people realise — sequential, no gaps, with audit-friendly format (INV-0001, INV-0002…). See how to number invoices for the conventions.

Step 4: A worked example

A sole trader graphic designer, registered for GST, invoicing a small-business client:

TAX INVOICE
INV-0042 — 4 June 2026

From:  Jane Smith t/a Jane Smith Design
       ABN 12 345 678 901
       jane@janesmithdesign.com.au

To:    Acme Co Pty Ltd
       ABN 98 765 432 109

————————————————————————————————————————————
Brand identity design — final delivery        $3,500.00
Print collateral (business cards + letterhead) $  600.00
————————————————————————————————————————————

Subtotal:                                       $4,100.00
GST (10%):                                      $  410.00
Total (AUD):                                    $4,510.00

Due 18 June 2026 (Net 14)

Payment:
   BSB / Account: 000-000 / 000 000 000
   Account name:  Jane Smith
   PayID:         jane@janesmithdesign.com.au

Every required field is on the invoice. The client’s ABN appears because the total is over $1,000. The words “Tax Invoice” appear because Jane is GST-registered. That’s the complete ATO-compliant pattern.

Step 5: Payment terms

Sole traders mostly use Net 7 or Net 14. Bigger commercial clients often have Net 30 in their own systems. The pattern that works for sole traders:

Net 7 for repeat clients you trust.
Net 14 as the default for new clients and small businesses.
Net 30 only when you have to (large corporates, agencies, government).

Always show the due date on the invoice in plain text, not just “Net 14” — bookkeepers and AP systems scan for “Due [date]”. Full conventions in payment terms in Australia.

Step 6: Record-keeping that survives an audit

The ATO requires sole traders to keep every invoice (issued and received) for at least 5 years. Digital copies are fine. The system that works:

Every invoice you issue — stored automatically by Free Invoice App and downloadable as PDF.
Every receipt for a business expense — photographed at the time of purchase. See how to track business expenses.
Every bank statement for the business account — either a separate account, or your personal account if you only have a few business transactions.
Quarterly BAS lodgements if you’re GST-registered — see how to prepare for BAS.

Full guidance: how long to keep invoices.

Sole trader vs Pty Ltd: when to switch

Two common triggers move a sole trader to a Pty Ltd company structure:

Income consistently above ~$120k. The flat 25% company tax rate becomes attractive vs. the personal marginal rate.
Personal liability exposure. If your work could result in a claim (building, advice, consulting at scale), a company is a liability firewall.

Until one of those triggers is real, the sole trader structure’s simplicity is hard to beat — no separate tax return, no company maintenance, no director duties. Almost every sole trader stays that way for years before any change is warranted.

How Free Invoice App fits a sole trader

Free Invoice App was designed around sole-trader invoicing in Australia. ABN, GST, payment terms, BSB/PayID, business name vs. legal name — all set up once and applied to every invoice. The Free plan covers 7 sends per month at no cost; Pro plans add recurring invoices, scheduled sending, expense tracking, and a custom email domain. Get started free.

Frequently asked questions

Do sole traders need an ABN to invoice?

Yes. Without an ABN, clients must withhold 47% of the payment under ATO rules. ABNs are free at abr.gov.au.

Do sole traders charge GST?

Only when GST-registered, which is mandatory once turnover hits $75,000 in any 12-month period. Below that, registration is optional.

What goes on a sole trader invoice?

Business name, ABN, invoice number, date, client name (and ABN if over $1,000), line items, GST line if registered, terms with due date, and bank details. “Tax Invoice” must appear if you’re GST-registered.

How long do sole traders have to keep invoices?

5 years per the ATO. Digital copies are accepted.

Can sole traders charge late fees?

Yes, when they were disclosed in your terms before the work was done. Standard is around 1.5% per month.