Rebate Tool

Solar STC Rebate Calculator (Australia)

Estimate the federal STC incentive on an Australian solar install from system size, your zone rating, deeming years and the STC price.

Evidence-first · every figure sourcedReviewed July 2026Our methodology

Key takeaways

Estimates the federal STC incentive on an Australian solar install.
Uses your system size, zone rating, deeming years and the STC price as inputs.
Returns the STC count and an estimated rebate value.

System sizekWTotal panel (DC) capacity being installed.Solar zoneSet by your postcode (Clean Energy Regulator).Deeming yearsyrs5 for a 2026 install; drops by one each year to 2030.STC price$Market price, capped at $40. Often ~$38.

STCs created

Estimated rebate

$1,710

How it works

Australia's Small-scale Renewable Energy Scheme (SRES) gives eligible solar installs a number of Small-scale Technology Certificates (STCs), usually taken off the price up front:

STCs = system kW × zone rating × deeming years, rounded down to whole certificates.
Zone ratingreflects your region's sunshine and is set by postcode by the Clean Energy Regulator (Zone 1 1.622 → Zone 4 1.185).
Deeming years count the years left in the scheme: 5 for a 2026 install, falling by one each year until the scheme ends in 2030.
Rebate = STCs × STC price. The price floats with the market (capped at $40); installers usually quote a little under that.

Figures reflect 2026 SRES settings — verify the current zone rating and STC price (via the Clean Energy Regulator) when you get a quote.

Estimates only — for guidance, not a quote or engineering specification. Nothing you enter is stored or sent anywhere; the maths runs entirely in your browser.

Good to know

Frequently asked

Is this calculator free to use?: Yes. The STC rebate calculator is free and needs no sign-up. It runs entirely in your browser.
Is my data stored or sent anywhere?: No. The calculator runs in your browser and stores nothing. The figures you enter are not saved or sent anywhere.
How accurate is the estimated rebate value?: The figure is an estimate based on the system size, zone rating, deeming years and STC price you enter. It is not a quote or a guaranteed rebate amount.

Keep calculating

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Australia's Small-scale Renewable Energy Scheme (SRES) gives eligible solar installs a number of Small-scale Technology Certificates (STCs), usually taken off the price up front:

STCs = system kW × zone rating × deeming years, rounded down to whole certificates.
Zone ratingreflects your region's sunshine and is set by postcode by the Clean Energy Regulator (Zone 1 1.622 → Zone 4 1.185).
Deeming years count the years left in the scheme: 5 for a 2026 install, falling by one each year until the scheme ends in 2030.
Rebate = STCs × STC price. The price floats with the market (capped at $40); installers usually quote a little under that.

Figures reflect 2026 SRES settings — verify the current zone rating and STC price (via the Clean Energy Regulator) when you get a quote.

Frequently asked

Is this calculator free to use?

Yes. The STC rebate calculator is free and needs no sign-up. It runs entirely in your browser.

Is my data stored or sent anywhere?

No. The calculator runs in your browser and stores nothing. The figures you enter are not saved or sent anywhere.

How accurate is the estimated rebate value?

The figure is an estimate based on the system size, zone rating, deeming years and STC price you enter. It is not a quote or a guaranteed rebate amount.