The job is done. The panels are on the roof, the customer is happy, the crew has moved to the next site. And your money is still sitting on someone else’s desk.
This is the part of the solar business nobody puts in the brochure. You have paid for the panels, paid the crew, covered the fuel and the cranage, and the Small-scale Technology Certificates (STCs) that make the numbers work have not turned into cash yet. For a one-job-a-week operation that is an annoyance. For a business turning over 20, 30 or 50 jobs a month, it is a structural cashflow problem that quietly decides whether you can make payroll without dipping into an overdraft.
I have traded certificates since the days they were RECs, watched the scheme split into STCs, and watched plenty of good install businesses get caught short not because the work dried up but because the cash from finished work landed too late. The gap between install and STC payment is one of the most underrated risks in this trade. Let me walk through how it actually works, where the days disappear, and what you can do about it.
STCs are a certificate, not a rebate, and that matters for timing
First, the thing the whole industry keeps getting wrong. STCs are not a government rebate. They are tradeable certificates created from the deemed generation of an eligible small-scale system, and liable entities (mainly electricity retailers carrying obligations under the federal Renewable Energy Target) have to buy and surrender them to the Clean Energy Regulator to meet those obligations (Clean Energy Regulator, 2026).
The customer assigns their right to create those certificates to you (or to the retailer) in exchange for an up-front discount on the system. That assignment is why it feels like a rebate to the homeowner. To you, the installer, it is nothing of the sort. It is a certificate you create, validate and then sell into a market, and the cash only arrives once that whole chain has run its course.
The reason this distinction matters for cashflow is simple: a rebate would be a fixed amount paid on a fixed schedule. An STC is a market instrument whose price floats and whose payment depends on paperwork, validation and a trader’s processing cycle. Every one of those steps is a place where days go missing.
How the cash actually moves from roof to bank
Here is the chain, start to finish.
You finish the install. You (or a trader acting for you) create the STCs against the system, which means compiling the documentation the scheme requires: proof the installer holds the right accreditation, the owner’s signed assignment, confirmation of grid connection, and the install photos. That package gets lodged with a registered agent or trader.
The trader validates the lot. If anything is missing or inconsistent, the batch stalls until you fix it. Once it clears, the certificates are registered and the trader pays you the agreed rate, which is the market value minus their margin for taking the certificates off your hands now rather than making you wait for the regulator’s clearing process.
There are two main ways an STC is monetised. The Clean Energy Regulator operates a clearing house that buys STCs at a fixed statutory price, but that queue can back up, so most installers opt to sell through an open-market trader instead, accepting a modest discount on the clearing-house value in return for getting paid sooner. That discount is the price of speed. The slower your paperwork, the more that trade-off works against you, because you are paying for speed at the trader’s end while losing it at your own.
The Australian trader market is thin, and that adds friction
If you are picturing a competitive marketplace of certificate buyers, adjust your expectations. The Australian STC trading market is dominated by a small number of platforms. Formbay is one of the major players, and Bridge Select (Greenbank) is the other most installers will recognise.
Neither offers self-serve onboarding in the way a modern SaaS tool would. Setting up trading access with Formbay, for instance, requires registering an account and linking your SAA accreditation details before you can lodge, and API access for anyone wanting to automate lodgement has to be manually activated (Formbay, 2026). That is a friction point worth knowing about before you assume you can just plug your systems together and have certificates flow automatically. You cannot, at least not without a phone call and a wait.
I am not knocking the traders here. The point is structural: a thin market with manual onboarding means you do not have much leverage on processing speed once a batch is in. The lever you do control sits entirely on your side of the fence, and it is the paperwork.
Where the days actually disappear: the paperwork
In my experience, the single biggest cause of slow STC payment is not the trader and not the regulator. It is documentation that was not captured cleanly at the time of install and has to be chased afterward.
Think about what has to be right before a certificate can be created: SAA-accredited installer details, the owner’s signature on the assignment form, a serial-numbered equipment list, confirmation of grid connection, and clear, compliant install photos. Solar Accreditation Australia sets out the accreditation and install-documentation expectations that underpin all of this (Solar Accreditation Australia, 2026). Miss one item and the whole batch waits.
The cruel part is how the failure compounds. A missing signature on one job does not just delay that job’s certificates. If you lodge in batches, and most installers do, one incomplete file can hold up the whole submission while your admin person chases a homeowner who is now back at work and not answering the phone. Thirty jobs of cash held hostage by one missing form is a story I have seen play out more times than I can count.
Batch lodgement versus per-job: it is a financing decision
Most installers accumulate paperwork and lodge in batches. It makes sense on the surface: batching reduces the per-submission admin overhead and lets one person knock over a week’s worth of lodgements in a sitting.
But batching is not just an operations choice. It is a financing decision, and most people never frame it that way. If you do 30 jobs across a month and lodge them all at the end, the cash from the job you completed on the 2nd does not move any faster than the job you completed on the 29th. You have effectively given yourself an interest-free loan to the trader for the better part of a month, on your own money.
Per-job lodgement, where you submit each system as soon as its documentation is complete, carries higher overhead but shortens the cycle dramatically. The job done Tuesday is in the trader’s hands Wednesday, not in three weeks’ time. Whether that overhead is worth it depends on your volume and your cash position, but you cannot make that call sensibly until you see it as the financing trade-off it actually is.
Treat STCs as receivables, not income
Here is the accounting habit that gets businesses into trouble. When the install is done, it feels like the money is made. The temptation is to book the STC value as income the moment the panels are up.
It is not income at that point. It is a receivable, and an uncertain one, because the price floats and the timing depends on paperwork you may not have finished. The Australian Taxation Office’s guidance on accounting for income and the timing of when revenue is actually derived is worth understanding properly here, because treating an unsettled receivable as banked income inflates the apparent health of the business and hides the cashflow gap until it bites (Australian Taxation Office, 2026).
The practical version: keep an STC receivables line. Track what has been installed, what has been lodged, and what has actually settled, as three separate numbers. The gap between “installed” and “settled” is your real exposure, and if you are not watching it, a busy month can leave you cash-poor at exactly the moment you are growing fastest.
What actually tightens the cycle
The fix is not glamorous. It is discipline at the point of install.
Capture everything on the day. Photos, serial numbers, the signed assignment, owner ID verification, grid-connection confirmation, all collected before the crew leaves the site, not chased the following week. Every day a document is missing is a day’s delay in lodgement, and a day’s delay in lodgement is a day’s delay in cash. This is the same back-office discipline that decides so many trades businesses quietly, the boring admin work that never feels urgent until the overdraft does. I have written before about the hidden cost of running your solar business across disconnected tools, and STC paperwork is the textbook case: the data is captured in one place, needed in another, and re-keyed in a third.
This is exactly the problem I am building CurrentFlow to solve. The idea is a single system where the install documentation, the sign-offs and the lodgement-ready package come together as the job progresses, so the paperwork is complete the day the install is, not a fortnight later. It is the tool I wished I had every time I watched cash sit idle behind a missing form. It is not built yet, and I will not pretend otherwise, but if the lodgement gap is squeezing you, that is the gap it is designed to close.
Until then, the advice stands on its own: capture at install, lodge sooner, track STCs as receivables, and know that the days you lose are almost always your own paperwork, not the trader’s queue.
References
Australian Taxation Office. (2026). Income and deductions for business. https://www.ato.gov.au
Clean Energy Regulator. (2026). Small-scale Renewable Energy Scheme and the STC market. https://www.cleanenergyregulator.gov.au
Formbay. (2026). STC trading and lodgement platform. https://trading.formbay.com.au
Solar Accreditation Australia. (2026). Accreditation. https://saaustralia.com.au
FAQ
How long does it take to get paid for STCs after an install?
There is no fixed figure, and anyone quoting you one is guessing. The cash depends on how quickly your documentation is complete, how often you lodge, and the trader’s processing cycle. In practice it is usually weeks rather than days, and the biggest variable is on your side: how fast you get a complete, compliant lodgement package to the trader.
Are STCs a government rebate?
No. STCs are tradeable certificates created from a system’s deemed generation. Liable entities under the Renewable Energy Target must buy and surrender them to the Clean Energy Regulator. The customer assigns their right to create the certificates to you in exchange for an up-front discount, which is why it feels like a rebate to them but is not one for your business.
Should I lodge STCs per job or in batches?
Batching lowers your admin overhead but lengthens the time your money sits unsettled. Per-job lodgement costs more in effort but gets cash moving faster. Treat it as a financing decision based on your volume and cash position, not just an operations habit.
Why does my paperwork hold up the whole STC batch?
Because a batch can only be lodged once every file in it is complete. One missing signature, serial number or grid-connection confirmation stalls the whole submission. That is why capturing every required document at the time of install, rather than chasing it afterward, is the single biggest lever you have on STC cashflow.
Can I automate STC lodgement with my own software?
Not easily. The main Australian trading platforms do not offer self-serve onboarding, and API access generally has to be manually activated through their support teams. Plan for a setup process and a wait if automation is your goal, rather than assuming an instant connection.