Do Plumbers Need an ABN in Australia?
Quick Answer
Yes — if you're a self-employed plumber, subcontractor, or running your own plumbing business. Employees don't need their own ABN (your employer has one).
When You Need an ABN
- You're a sole trader plumber
- You subcontract to other plumbing companies
- You run a plumbing company (Pty Ltd)
- You want to claim GST credits
- You invoice customers directly
When You DON'T Need an ABN
- You're an employee (PAYG) working for someone else's plumbing business
- You're an apprentice employed under a training contract
What Happens Without an ABN?
If you provide services without quoting an ABN, the payer is legally required to withhold 47% of your payment and send it to the ATO. This is called "no ABN withholding" — you'll get the money back at tax time, but your cash flow will suffer badly.
How to Get an ABN
Register free at abr.gov.au. Takes 5 minutes online. You'll receive your ABN immediately. You'll also need to decide whether to register for GST (mandatory once turnover exceeds $75,000/year).