HVAC Invoice Template - Australia

Yes, if you're GST registered (ABN required). Australian law requires GST to be shown as a separate line item on every invoice. Calculate GST as 10% of your subtotal and include your ABN prominently. You must be GST registered if your annual turnover exceeds $75,000. Your invoice should clearly display the GST amount, total including GST, invoice number, and issue date. This approach protects both you and your customer for compliance purposes.

Separate your invoice into distinct line items: equipment (split system unit, thermostat), labor (installation hours), materials (refrigerant type and volume), and additional services (ductwork, testing). This clarity helps clients understand what they're paying for and supports your GST record-keeping. For example, itemize a 5kW split system separately from installation labor and R410A refrigerant. Breaking down costs by category also makes disputes easier to resolve and demonstrates professionalism to commercial clients like property managers.

Yes, emergency and after-hours callout fees are standard practice in the HVAC industry in Australia. Simply itemize it as a separate line on your invoice with a clear description like "Emergency weekend service fee" or "After-hours callout charge." The fee should be reasonable and disclosed upfront when possible. You can also use a higher hourly rate for after-hours work instead. Document the actual call time and date on your invoice to justify the charge.

Your invoice must include your business name, ABN (if GST registered), contact details, invoice number, issue date, customer name and address, itemized description of all services and parts supplied, quantity and rate for each item, GST amount shown separately, total amount due, and payment terms. Use your principal place of business as the address if you operate from multiple sites. Including payment method details helps avoid disputes. For HVAC work involving refrigerant, note the specific refrigerant type used for environmental compliance.

List each service type as a separate line item with clear descriptions: "Split system air conditioner installation - 5kW capacity," "Ducted air conditioning service and filter replacement," or "Evaporative cooler maintenance and cleaning" appear as distinct entries with individual rates and quantities. This transparency shows customers exactly what work was performed and at what cost. It also helps you identify which services are most profitable and allows customers to compare costs per service. When invoicing for maintenance contracts including multiple service types, this itemization prevents confusion and supports accurate tax records.

Yes, but there are important differences. A quote is an estimate; an invoice is a formal demand for payment with legal standing. Before converting a quote to an invoice, verify the services were actually completed as quoted, update quantities if work scope changed, confirm the final price, and assign a new invoice number. Add the current invoice date and payment terms. In Australia, issue an invoice within 30 days of completion. Keep the original quote on file for your records, as it protects both you and the customer if disputes arise about agreed-upon work.

List refrigerant charges as a separate line item specifying the type (R410A, R32, etc.), quantity supplied, and rate per unit. For example, "Refrigerant gas top-up - R410A, 2 units at $120" shows transparency and professionalism. Including the refrigerant type is important for environmental compliance and helps customers understand the cost. Some invoices also note whether the refrigerant is included in a warranty or service package. Clear itemization demonstrates expertise and justifies costs to customers unfamiliar with HVAC pricing. Keep disposal and handling documentation available if required by environmental regulations.

Don't modify the original invoice. Instead, issue a credit note for any reductions or adjustments, then issue a revised invoice if necessary. Credit notes must reference the original invoice number and include the same information: your ABN, business details, date, and itemized adjustment details. For HVAC work, common adjustments include warranty coverage changes or discovered additional damage requiring extra work. Issuing a formal credit note and revised invoice maintains proper records for GST purposes and demonstrates professionalism to clients. Keep all versions for audit compliance.