How to Invoice as a Plumber in Australia

What Should Go on a Plumbing Invoice

A solid plumbing invoice covers the basics clearly: your business name and ABN, the client's details, an invoice number and date, the job address, and a plain-English description of the work done — a blocked drain cleared, a hot water system replaced, a leaking tap fixed. Listing labour and materials as separate line items makes the invoice easier for the customer (and for property managers or strata clients) to check at a glance, and it gives you a clean record if a job ever needs to be revisited.

GST on Plumbing Work: What You Need to Know

In Australia, businesses generally need to register for GST once their annual turnover reaches $75,000, though you can register earlier if it suits you. Once registered, you charge 10% GST on top of your prices and need to issue a proper tax invoice — showing your ABN and either the GST amount or a statement that the price includes GST — for any sale over $82.50. If you're not registered for GST, you shouldn't charge it. This is general information, not tax advice, so check your specific situation with your accountant or the ATO.

Why Your ABN Matters on Every Invoice

Every invoice you send should carry your ABN. Beyond looking professional, it matters practically: if you don't provide an ABN, a business client may be required to withhold tax from payments over $75 under the ATO's no-ABN withholding rules. A clearly displayed, verifiable ABN also builds trust with commercial clients, strata managers, and letting agents who keep their own compliance records.

Invoicing for Emergency Callouts vs Bigger Jobs

For quick callouts, it pays to invoice on the spot before you leave site — it's easy for a $150 job to get forgotten once you're on to the next one. For bigger jobs like a bathroom renovation or a full hot water system upgrade, a written quote up front, a deposit before ordering materials, and progress invoices as the work moves along protect your cash flow and keep expectations clear on both sides.

Getting Paid Faster as a Plumber

Small habits make a real difference to how quickly you get paid: set a clear due date (7 days is common), offer more than one payment method, send the invoice the same day the job wraps up rather than days later, and follow up promptly — politely but promptly — on anything that runs overdue. Keeping a simple record of what's paid and what's outstanding also makes it much easier to chase the right jobs at the right time.

How Invogo Helps Plumbers Invoice Faster

Invogo lets you put together a GST-ready, ABN-verified invoice from your phone before you've even left the job site, save regular clients and common line items so you're not retyping the same thing every week, and see at a glance which invoices are paid, unpaid, or overdue. The free tier covers up to 5 invoices or quotes a month, so you can try it on your next few jobs before deciding if you need more.