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STC assignment form for solar: what to check

Short answer

For rooftop solar, the assignment form must name the owner and address, state the system size and equipment, record the transfer of STC rights and be signed before you claim. System details must match the registry and your photos exactly.

Written and checked by the Energy Merchants desk · Reviewed 2 October 2026 · For installers

Solar jobs are the bread and butter of the STC scheme, and the assignment form is one of the least glamorous parts of them. It is also what the regulator checks when it wants to know whether the owner agreed. This is the solar-specific view; for the generic structure, see STC assignment form template.

What the solar form must carry

  • Owner details. Name, address, contact, and ABN for business owners.
  • Installation address. The same as the registry and your photos.
  • System details. Panel brand and model, number of panels, inverter brand and model, and the system capacity in kilowatts.
  • The assignment. A clear statement that the owner assigns the right to create STCs to the claimant.
  • Value passed on. The discount or consideration the owner receives, usually shown on the quote.
  • Signature and date. Before the claim is made.

The numbers that must agree

The system size on the form, in your quote and in the registry must match. A 6.6 kW system on the quote and 6.60 kW on the form is fine. A 6.5 kW system on one and 6.6 on another is a query. Check the STC count too: at the time of writing a 6.6 kW system in zone 3 earns 45 STCs. See how much the rebate is for 6.6 kW.

Common mistakes

  • Signing before the system size is final.
  • Mismatched addresses, such as unit numbers left off.
  • Missing date or signature.
  • Using a form that was designed for a battery or hot water job.

From the desk: if the design changes after the owner signs, get a fresh form. A corrected form beats an explanation later.

Add-ons and upgrades

If the owner later adds panels or a battery, treat it as a new job with its own form. Do not stretch the original form to cover it. A fresh form tied to the new equipment and date keeps the claim clean, and avoids confusion about what was installed when.

What this means for installers

Make the form part of your install day routine, and review it at the same time as the photos. The assignment form guide and photo requirements cover the details, and how it works and STC trading show how your claim turns into a sale. The top rejection reasons are worth a read.

Follow-up questions

People also ask

Does the form need the inverter serial number?
It should reflect the equipment installed. Match your form to the details in your claim.
What if the owner changes their mind after signing?
Raise it before lodging the claim. Reversing an assignment after certificates are created is difficult.
Who keeps the form?
You keep it as the claimant, for the period the regulator requires.

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