Install Before the Rebate Drops: What the Deadline Costs You

Rooftop solar panel array installed on a Brisbane home before the rebate deadline

Every solar company in Brisbane is running some version of a countdown right now. We have one on this website. So it is worth being precise about what actually happens on 1 January 2027, what it costs in dollars, and whether it should change your timing.

Short version: the rebate reduces, the amounts are known, and for most households it is somewhere between $360 and $900. That is real money and worth having. It is not a reason to buy the wrong system.

What actually changes

Two federal rebates step down on the same date.

The solar rebate is calculated from expected generation between installation and the end of 2030. Each January, one year drops off that calculation. Fewer years, fewer certificates, smaller discount.

The battery rebate steps down from 6.8 to roughly 5.7 certificates per usable kilowatt-hour — about $252 down to $211 per kWh.

Neither disappears. Both simply get smaller, and continue getting smaller every year until the scheme ends in 2030.

What it costs in dollars

Using current certificate prices, here is the difference between installing before 31 December 2026 and after.

Solar only

6.6kW system — roughly $1,800 now, around $1,440 in 2027. Difference: about $360
10kW system — difference of about $545
13kW system — difference of about $710

Battery only

10kWh battery — roughly $2,520 now, around $2,110 in 2027. Difference: about $410
13.5kWh battery — difference of about $550

Solar and battery together

6.6kW + 10kWh — total difference around $770
13kW + 13.5kWh — total difference around $1,260

These are indicative. Certificate prices move with the market, and your postcode affects the solar calculation. But the order of magnitude is reliable.

The date that counts is installation, not signing

This catches people out, and it is the part worth acting on.

Your rebate is locked to the date your system is installed and certified — not the day you accepted a quote, paid a deposit, or shook hands.

Which means a contract signed in November for a February installation receives the 2027 rate, not the 2026 one.

Between quoting, site inspection, scheduling, installation and grid connection paperwork, the process takes longer than most people expect. If the deadline genuinely matters to you, the decision point is well before December.

Where this sits against the total cost

Some perspective, because the countdown clocks rarely provide any.

On a typical solar and battery installation, $770 is a meaningful sum — but it is a small fraction of the total. Choosing a poorly sized system, or an installer who will not be around for the warranty, costs considerably more than that over fifteen years.

Put differently: the rebate difference is worth roughly one to two years of the savings a well-designed system delivers. Getting the system right matters more than getting it early.

When the deadline should change your timing

Act before December if:

You have already decided you want solar or a battery and are simply choosing when
You have quotes in hand and are comparing them
Your roof is sound and your usage is understood
You are planning a larger system, where the dollar difference is greatest

In those situations, waiting achieves nothing except a smaller rebate.

Do not rush if:

You are still working out whether it suits your household
Your roof needs replacing in the next few years
You are being pushed toward a system larger than your consumption justifies
You are moving house within a year or two
You have not compared quotes properly

There is a deadline every January until 2030. Missing this one is not a disaster.

Sales tactics worth recognising

The deadline is real, which makes it easy to misuse. Signals worth treating carefully:

A price available only today, when the deadline is months away
A deposit requested before you have a written quote
Claims that the rebate is ending entirely — it is reducing, not ending
Pressure to sign without a site inspection
Reluctance to itemise the rebate on the quote

A genuine deadline does not require a decision this afternoon. Anyone suggesting otherwise is selling urgency rather than solar.

What we would suggest

If you are considering solar or a battery in the next twelve months, get quotes now and make an unhurried decision. That way you either install before the deadline and keep the larger rebate, or you decide it is not right and have lost nothing.

What we would not suggest is signing something in the last week of December because a countdown told you to.

For how the two rebates work, see our Queensland rebate guide and the battery rebate explainer. For what to ask before choosing anyone, our guide to choosing a solar installer covers the questions that matter.

Getting your actual numbers

The figures above are indicative. What you would receive depends on your postcode, system size, battery capacity and the certificate price on your installation date.

We itemise the rebate on every quote, so you can see exactly what it is worth rather than taking a countdown clock at its word.

Get a free quote →