Setting Up as a Self-Employed Plumber in Australia — ABN, Licences and Tax

Going out on your own as a plumber is one of the best financial moves a tradesperson can make — you control your rates, your schedule and your future. But the business setup side can feel overwhelming if you've always been an employee. This guide walks you through every step.

Step 1: Get Your ABN

An Australian Business Number (ABN) is a free 11-digit identifier for your business. You need one to invoice clients legally, register for GST, and operate as a self-employed tradie.

How to apply: Register at the Australian Business Register (abr.gov.au). The process takes about 15 minutes online and your ABN is typically issued within a few days. It's free — you should never pay anyone to get an ABN.

When applying, you'll need to choose a business structure (see below) and provide your personal details including your tax file number.

Plumbing Licences by State

Plumbing is a licensed trade in every Australian state and territory. You cannot legally do plumbing work without the appropriate licence, and you cannot get a contractor licence without first being a qualified tradesperson.

Contact your state's authority to confirm current requirements — licence conditions and fees change regularly.

Sole Trader vs Company

Most plumbers starting out go sole trader — it's simpler, cheaper and has less admin. Here's the quick comparison:

Sole Trader: You and the business are legally the same entity. Simple setup, low cost, straightforward tax return. Your personal assets (house, car) are at risk if the business gets sued — which is why public liability insurance is essential.

Company (Pty Ltd): Separate legal entity. More setup cost and ongoing admin, but your personal assets are protected from business debts (with some exceptions). Generally worthwhile when your profit exceeds $100,000+ per year.

Most sole trader plumbers start as a sole trader and consider a company structure once the business is established and profitable.

GST Registration

You must register for GST if your annual turnover exceeds $75,000. As a plumber charging $80–$150+ per hour, you'll hit this threshold quickly.

Once registered, you:

• Add 10% GST to your invoices
• Lodge a Business Activity Statement (BAS) quarterly
• Claim back GST on business purchases (tools, materials, vehicle costs)

Practical tip: Set aside 10% of every invoice payment into a separate account for GST. That money isn't yours — it belongs to the ATO. Mixing it with your income is how tradies get into trouble at BAS time.

What to Charge as a Self-Employed Plumber

Plumber rates in Australia in 2026 typically range from $80–$200+ per hour depending on your state, experience and the type of work. Don't just match what your old employer charged — you now have to cover your own super, insurance, vehicle, tools and down time.

A useful formula: take what you need to earn per year (say $100,000), add 30% for business costs, divide by your billable hours (typically 1,000–1,300 for a sole trader), and that's your minimum rate. Most experienced plumbers should be charging $120–$160/hr plus materials.

Insurance You Need

As a self-employed plumber you need public liability insurance before you start work — most builders and homeowners require it. Compare tradie insurance options here, or get an instant quote from BizCover in under 10 minutes.

Business Banking

Open a separate business bank account immediately. Mixing personal and business money is the number one mistake new sole traders make — it makes tax time a nightmare and creates ATO audit risks.

Good options for plumbers: ANZ Business, NAB Business Everyday, or fintechs like Zeller or Up Business that have no monthly fees.

Accounting Software

You need to invoice clients, track expenses and prepare for BAS quarterly. Good accounting software makes this manageable.

For sole trader plumbers: Rounded is purpose-built for Australian sole traders and costs from $15/month. For plumbers with employees or wanting more features: Xero is the most popular choice.