Solar Installer Invoice Example
A residential solar install invoice with supply and install line items and the STC incentive applied as a discount.
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| Description | Qty | Rate | Amount |
|---|---|---|---|
| Solar panels, 16 x 415W supply and install | 1 | A$4,200.00 | A$4,200.00 |
| Inverter, 5kW supply and install | 1 | A$1,650.00 | A$1,650.00 |
| Switchboard upgrade | 1 | A$480.00 | A$480.00 |
| STC incentive (point-of-sale discount) | 1 | -A$1,850.00 | -A$1,850.00 |
GST included at 10 percent. ABN 77 604 552 918. STC incentive applied as an upfront discount; panels carry a 10-year warranty and the inverter 5 years.
Solar installation invoices need to separate supply and install costs for each major component, since customers and financiers often want to see the panel, inverter and any electrical work priced individually. The federal STC incentive is applied as a point-of-sale discount in almost all residential jobs, so it should appear as its own line rather than being baked into the panel price. GST and your ABN apply once you are registered, which most solar installers are given typical job values.
What should a solar installer invoice include?
- System size in kW and panel count with wattage per panel
- Panels priced as supply and install, not just supply
- Inverter priced as its own supply and install line
- Any switchboard or electrical upgrade needed to support the system
- STC incentive shown as a discount line, not folded into the panel price
- Warranty terms for panels and inverter, since they usually differ in length
- ABN and GST shown clearly once registered
How to create a solar installer invoice
- 1Add your business details. Your name, address, contact details and tax number if you are registered.
- 2Add the client. Their name and billing address. Save them to reuse next time.
- 3List the work. Break the job into clear line items the way a solar installer bills (see below).
- 4Add tax. Apply your tax rate (this example uses 10%).
- 5Set payment terms and a due date. State when payment is due and how the client can pay.
- 6Download or send. Export a clean PDF, or email it to the client. No signup, no watermark.
How do you itemise a solar installer invoice?
Price panels and inverter as separate supply and install lines rather than one lump system price, since customers comparing quotes expect to see where the cost sits. Any switchboard or electrical upgrade required to connect the system should be its own line, since not every job needs one and lumping it in makes your base price look inconsistent with other quotes. The STC incentive is a discount, not income, so show it as a negative line reducing the total rather than adjusting the panel price to hide it. Keep warranty terms in the notes rather than the line items, since panel and inverter warranties usually run for different periods.
What do solar installers typically charge?
| Region | Typical billing |
|---|---|
| Australia | A$4,500-$8,000 for a 6.6kW system after STC discount |
| United States | $16,000-$24,000 for a 6kW system before federal tax credit |
| United Kingdom | £5,500-£9,000 for a 4kW system |
| Canada | C$14,000-$20,000 for a 6kW system before incentives |
Indicative ranges for guidance. Your rate depends on experience, location and the job.
Do solar installers charge tax on invoices?
In Australia, GST applies at 10 percent once registered, and the STC incentive is treated as a point-of-sale discount rather than a rebate paid to the customer, so it reduces the GST-inclusive price rather than being GST-free income to you. Your ABN must be shown on every invoice. Below the A$75,000 turnover threshold registration is optional, but almost all solar installers are well above it given typical job values.
What payment terms should a solar installer use?
Solar jobs are commonly billed with a deposit on signing, a progress payment on delivery of panels and inverter, and a final payment on completion and grid connection approval. Some installers hold back a small final amount until the distributor confirms the system is approved to operate. Because job values are high, get the deposit and progress terms in writing before ordering equipment.
Frequently asked questions
Do I show the STC incentive as a discount or GST-free amount?+
Show it as a discount line reducing the total price. It is not paid to the customer directly in most residential deals, since the installer assigns the STCs and passes the value on as a lower price.
Should the switchboard upgrade be quoted separately from the solar system?+
Yes, quote and invoice it as its own line since not every property needs one, and folding it into the system price makes your solar pricing look inconsistent from job to job.
What warranty period do I put on the invoice?+
Note panel and inverter warranties separately since they are usually different lengths, commonly around 10 to 25 years on panels and 5 to 10 years on the inverter depending on brand.
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Use this exampleLast reviewed July 2026
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