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STC compliance, audits, clawbacks and fraud

Can a homeowner be liable for STC fraud if they sign a form without an install?

Short answer

A homeowner who knowingly signs an assignment form for an installation that did not occur, or lets someone claim on their property, can be exposed to enforcement action. Installers and retailers carry the heavier responsibility.

Written and checked by the Energy Merchants desk · Reviewed 3 October 2026 · For installers and homeowners

The assignment form is the homeowner’s legal statement that they are handing their right to the STCs to someone else, for a system that has been installed. The statement matters, and so does the order it is signed in.

What the signature means

When an owner signs the STC assignment form they are declaring the details are correct: the system, the address and the assignment. If no system was installed, or it was installed later, the form was inaccurate. See the explanation in the STC assignment form guide.

Homeowner exposure

Penalties under the scheme follow knowledge and intent. In general terms:

  • A homeowner who was misled, for example told it was a quote or an enquiry, is in a very different position from one who knowingly took part.
  • Knowingly signing for a system that was never installed, or allowing someone to claim certificates on their property for a payment, can be treated as fraud and may lead to enforcement action by the Clean Energy Regulator or state authorities.
  • Homeowners may also lose their own ability to claim if certificates have already been created for the address. See STCs already claimed on this house.

None of this is legal advice. If you are in this position, speak to a lawyer or a community legal centre.

What installers and retailers must not do

  • Ask a customer to sign before the system is installed and commissioned.
  • Accept a form signed for a system that has not been installed, “to get ahead”.
  • Pay customers for the use of their address or details.
  • Create certificates for a property the system is not on.

The installer, retailer and agent bear the larger duty because they know the rules and prepare the claim. See who is responsible and avoiding STC fraud as an installer.

From the desk: The form is signed after commissioning, dated truthfully, with every field filled in. Any other order is how the trouble starts.

What this means for installers and homeowners

Installers: never trade on a form you doubt. Customers who describe pressure to sign early are a warning sign. Homeowners: do not sign a blank form, read what is being assigned, and keep a copy. If you see certificates claimed on your property that you did not authorise, report it.

For related reading, see STC scams in solar, assigning STCs to a third party and the pillar on STC trading. A compliance pre-check, as described on how it works, reviews forms for signature and date problems before lodgement.

Warning signs for homeowners

Be wary of anyone offering cash for your roof details, asking you to sign forms before work starts, or saying a system will be installed later but the paperwork is needed now. Legitimate businesses install first, then ask you to sign. If a company will not give you a copy of what you signed, walk away and report it.

Follow-up questions

People also ask

What if I signed a blank form?
Do not sign a blank or undated form. If you already have, contact the Clean Energy Regulator and seek independent advice.
What should a homeowner do if STCs were claimed on their house without an install?
Tell the Clean Energy Regulator and the retailer or trader in writing, keep copies, and check your registry or agent records.

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