Liam is a carpenter in Brisbane. Sole trader, one ute, two builders who keep him busy most weeks.

Last month he sent an invoice for a fit-out job. Ten days later it came back from the builder's accounts team with four words: "Wrong format. Please reissue."

By the time he fixed it, the builder's fortnightly pay run had already gone. His money slid into the next one.

Nobody teaches tradies how to invoice as a sole trader. You learn the trade, you get the ABN, and then you work out the paperwork the hard way, usually one rejected invoice at a time.

So let's skip the hard way. Liam turned over about $68,000 last year and it's climbing, which puts him right in the zone where the invoicing rules are about to change. His situation covers almost every question a subcontractor runs into.

Which Invoice Do You Actually Need?

There are two kinds of invoice in Australia, and which one you send depends on one thing: whether you're registered for GST.

Not your income. Not your trade. Your registration status.

What Is a Tax Invoice, and Who Sends One?

A tax invoice is the document a GST-registered business sends. It lets the builder claim back the GST you charged, which is why their accounts team cares so much about getting it right.

The tax invoice requirements Australia-wide are set by the ATO, and they're specific. The words "Tax Invoice" at the top. Your business name and ABN. The date it was issued. A description of what you supplied, with quantity and price. The GST amount, or a statement that the total includes GST. And for sales of $1,000 or more including GST, the buyer's identity or ABN as well.

Miss one of those and the builder can't claim the credit. That's what "wrong format" usually means. If you're registered, an Australian tax invoice template with every field already built in removes the guesswork entirely.

Invoice Without GST: The Sole Trader Default

If you're not registered for GST, you send an ordinary invoice instead. The title is "Invoice." Never "Tax Invoice." Putting those words on a document when you aren't registered isn't a formatting quirk. It tells the builder's bookkeeper they can claim a credit that doesn't exist.

A good no GST invoice still carries your ABN, the date, an invoice number, the job description and the total. It also helps to add a short line at the bottom saying it isn't a tax invoice because you're not registered for GST. That one sentence saves the builder's accounts team a phone call.

Most sole traders under the threshold start here, which is why a sole trader invoice no GST setup is worth getting right from the first job. If you need one, here's an invoice template built for sole traders not registered for GST, with the ABN field and that declaration already in place.

The GST Threshold Isn't a Calendar-Year Number

This is the part that catches growing tradies out.

How GST Turnover Is Actually Measured

The ATO's GST registration threshold is $75,000 a year for most businesses. But it isn't checked once a year at tax time. Your GST turnover is your business income, not counting any GST, and the ATO looks at it two ways: the current month plus the previous 11 months, and the current month plus the next 11 months you expect.

If either figure reaches $75,000, you have to register, and you have 21 days to do it.

Back to Liam. Last financial year he did $68,000. Then in August he lands a big renovation and invoices $11,000 in a single month. His rolling 12 months jumps past $75,000 mid-year, even though last year's total looked safe. If he waits until tax time to notice, he's already late.

What Changes the Day You Register

Invoices you sent before your registration date stay exactly as they are. No reissuing, no fixing old paperwork.

From the effective date, every new invoice becomes a tax invoice with GST added, and the title changes to match. The mess only happens when someone keeps sending the old format after registering, because the builder can't claim GST from an invoice that doesn't show it.

How to Invoice as a Sole Trader, Step by Step

Registered or not, here's how to invoice as a sole trader in Australia so the builder's team can pay it on the first try.

Step 1: Put Your ABN on Every Invoice

This is the big one. If you're wondering how to invoice with ABN details correctly, it's simple: the full 11-digit number, on every single invoice, every time.

Here's why it matters so much. If a business pays you for work and your invoice doesn't quote an ABN, the ATO requires them to withhold 47% of the payment and send it to the tax office. You can get it back at tax time, but that's months away. On a $5,000 job, that's $2,350 you don't see this week.

An ABN invoice gets paid. An invoice without one gets withheld.

Step 2: Use the Right Title

Registered for GST? "Tax Invoice." Not registered? "Invoice." That's it. Two words or one, and they decide how the builder treats everything underneath.

Step 3: Reference the Job Site and Purchase Order

Builders don't pay invoices. They pay jobs. Put the site address and the builder's job or purchase order number on every invoice, so it lands against the right project in their system without anyone having to ask.

Step 4: Get the GST Right, Line by Line

If you're registered, show the GST clearly on each taxable line, or as a total for a simple invoice where everything is taxable. Don't round the numbers creatively. The builder's bookkeeper will notice a one-cent difference at quarter end.

Step 5: Match the Builder's Pay Run

Most builders pay on a fixed cycle, weekly or fortnightly. Ask when their cutoff is and get your invoices in before it. A perfect invoice that arrives one day late is still paid two weeks late.

Step 6: Send It, Then Keep It

Email a PDF so nobody can accidentally edit it. Then keep a copy. The ATO expects business records to be kept for five years, and that includes every invoice you send.

Construction-Specific Traps

General invoicing advice stops here. Construction has a few extra rules worth knowing.

Recipient Created Tax Invoices

Some builders don't wait for your invoice at all. They create the tax invoice themselves and send it to you, an arrangement known as an RCTI.

It's legitimate, but it comes with conditions. Both of you have to be registered for GST, and there has to be a written agreement that the builder will issue the invoices and you won't issue your own for the same work. If you've agreed to that, don't send a separate invoice as well. Two invoices for the same job is a recipe for double claiming.

The Builder Reports What They Pay You

This one surprises a lot of subcontractors. Businesses in building and construction may have to lodge a Taxable payments annual report with the ATO by 28 August each year, listing what they paid each contractor. That includes your ABN, your name and address, and the total they paid you, including any GST.

The ATO uses that report to cross-check against contractors' tax returns. In plain words: your invoices end up in front of the tax office twice, once from you and once from the builder. Make sure they tell the same story.

Use a Format Builders Recognise

You don't need anything fancy. A clean subcontractor invoice template Australia builders will recognise does the job: your details, theirs, the site, the work, the amount, and the right title. Call it a tradie invoice template or a construction invoice template, it doesn't matter. Consistency does. Same layout, same fields, same order, every time.

How Enerpize Handles Sole Trader Invoicing

Enerpize is a cloud-based, all-in-one ERP platform for small and medium-sized businesses, combining accounting, inventory, HR, sales, and CRM in a single system. For sole traders and subcontractors, it checks that your ABN appears on every invoice before it goes out, and sets the right invoice title based on your GST status.

When your registration takes effect, you update your status once and new invoices switch to tax invoices with GST calculated per line. Your invoiced revenue sits in one place, so you can see how close you are to the threshold. Each invoice shows whether it's been paid, reminders go out when due dates pass, and RCTI-style details like the buyer's ABN can be set up for builders who issue their own. Every invoice stays archived and searchable, which covers the five-year record keeping without a shoebox.

A template is enough when you've got two builders and a quiet month. Software earns its place when you've got six and no quiet months.

Get Paid on the First Try

Liam's next invoice went out with his ABN, the right title, the site address and the builder's job number. It was approved the same week and paid in the next run.

That's really all learning how to invoice as a sole trader comes down to. The right document for your GST status, the details builders need to match it, and keeping an eye on your rolling income so the threshold doesn't sneak up on you.

Get those right and the paperwork stops being the reason you wait for your money.

FAQs

Do I need to register for GST as a subcontractor?

Only once your turnover reaches $75,000 on the ATO's rolling basis, or you expect it to. Below that, registration is optional. Once you cross it, you have 21 days to register. Enerpize keeps all your invoiced revenue in one place, so you can see how close you are to the threshold before you cross it.

Can a sole trader send an invoice without an ABN?

You can, but you shouldn't, and it's the first thing to get right when you learn how to invoice as a sole trader. If your invoice doesn't quote an ABN, the business paying you generally has to withhold 47% and send it to the ATO. You get it back at tax time. Enerpize checks that your ABN is on every invoice before it's sent, so that never happens by accident.

Should my invoice say "Tax Invoice" if I'm not registered for GST?

No. If you're not registered, title it "Invoice" and add a short note saying it isn't a tax invoice because you're not registered for GST. Using the words "Tax Invoice" suggests the builder can claim a GST credit that doesn't exist. Enerpize sets the invoice title based on your GST status, and switches it when your status changes.

What is a recipient created tax invoice?

It's a tax invoice the builder creates and sends to you, instead of you sending one to them. It only works when both businesses are registered for GST and have a written agreement, and you shouldn't issue your own invoice for the same work. Enerpize lets you set up RCTI-style details, including the buyer's ABN, for builders who work this way.

About the Author

Omar El Bahr is a Senior Digital Growth Specialist at Enerpize, where he leads SEO, content strategy, and organic growth across international markets. He is a Forbes Communications Council contributor and has written for Entrepreneur on business communication and digital strategy.