If you’ve had a solar salesperson tell you “the rebate is ending, you have to sign today” — that’s not quite true, and it’s the kind of pressure tactic that gives this industry a bad name. What is true: two federal incentives step down on 1 January 2027, and the difference is worth real money. Here are the actual numbers, so you can decide on your own timeline.
Change 1: the battery rebate factor drops ~16%
The federal Cheaper Home Batteries Program calculates your discount using an STC factor per usable kilowatt-hour. That factor is 6.8 until 31 December 2026, and drops to 5.7 on 1 January 2027.
What that means at a market STC price of about $38:
- 10 kWh battery: 68 STCs (~$2,584) now → 57 STCs (~$2,166) from January. About $420 less.
- 14 kWh battery: 95 STCs (~$3,610) now → 79 STCs (~$3,002) from January. About $600 less.
- 20 kWh battery: 119 STCs (~$4,522) now → 99 STCs (~$3,762) from January. About $760 less.
The factor keeps stepping down every six months until the program ends in 2030, so waiting doesn’t ever make the rebate bigger. You can model your own system with our battery rebate calculator.
Change 2: the solar panel rebate loses a deeming year
Solar STCs are calculated as system size × zone rating × deeming years. The deeming period drops from 5 years to 4 on 1 January 2027. For a 6.6kW system in metro Melbourne (Zone 4):
- 2026: 6.6 × 1.185 × 5 = 39 STCs ≈ $1,480
- 2027: 6.6 × 1.185 × 4 = 31 STCs ≈ $1,180
Roughly $300 less on a standard system, more on larger ones. (If those STC counts look lower than other calculators told you, read our post on why many calculators get Melbourne’s zone wrong.)
The date that actually matters
Here’s the detail most sales pitches skip: the rebate is set by the installation date — specifically when the certificate of electrical compliance is issued — not the date you sign a contract. Signing in December for a February install gets you the 2027 rates.
This cuts both ways. There’s no need to sign anything “today”, but installer calendars genuinely fill up in November and December as everyone tries to beat the step-down. If you want 2026 rates, realistically you want a signed agreement and a confirmed install slot by early November.
What doesn’t change on 1 January
- The Solar Victoria $1,400 rebate and matching interest-free loan for solar panels — unchanged (though eligibility tightened to $150,000 household income on 1 July 2026)
- The battery program’s capacity rules — 100% of the factor on the first 14 kWh, 60% from 14–28 kWh, 15% from 28–50 kWh
- Battery eligibility — CEC-approved, VPP-capable battery, installed by an SAA-accredited installer
- Victoria’s free midday power window — see our post on the Midday Power Saver and why a battery changes the maths
Should you rush?
Honest answer: only if you were going to buy anyway. A battery that doesn’t suit your usage pattern is a bad purchase at any rebate level, and $400–$800 shouldn’t override getting the right system. But if you’ve already decided and are just sitting on the quote, the step-down is a genuine, quantifiable reason to book the install before the December rush rather than after New Year.
If you want the numbers run for your actual usage — including whether a battery stacks up for you at all — talk to us or read more about home batteries for Melbourne. If the maths doesn’t favour a battery for your household, we’ll tell you that too.