What to Include on a Plumbing Invoice (Legal Requirements)
Legal Minimum: ABN, business name, date, invoice number, description of work, amount (GST shown separately if registered), and payment terms. Missing any of these can cause issues with the ATO.
The 10 Must-Haves
- Your business name and ABN — legal requirement for tax invoices
- Invoice number — sequential (INV-001, INV-002, etc.)
- Date of issue
- Customer name and address
- Description of work performed — be specific
- Materials used — itemised with quantities
- Labour — hours or fixed price
- GST amount — shown separately (if GST registered)
- Total amount due
- Payment terms and bank details — "Due within 7 days" + BSB/Account
Bonus Items (Professional Touch)
- Your QBCC licence number (builds trust)
- Your logo
- "Pay Now" link for instant bank transfer or card payment
- Brief warranty statement ("12-month workmanship guarantee")
- Next service reminder ("Hot water system should be serviced in 5 years")
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