Is there GST on your electricity bill? What actually gets taxed

The short answer, and the part that surprises people

Yes — electricity supplied to Australian homes is a taxable supply, so GST of 10% applies to the energy charges on your bill. What surprises people is that GST does not apply uniformly across every line. Your usage charges, daily supply charge and controlled-load charges are generally taxed. Several administrative fees are not. And if you have solar, the order in which GST and your feed-in credit are applied matters quite a lot to how the bill reads.

This is worth understanding for a practical reason: if you are comparing two plans, or checking whether a bill is right, you need to know whether the rates you are looking at include GST or exclude it. Compare a GST-inclusive rate against a GST-exclusive one and you will be out by roughly 9% before you start — enough to pick the wrong plan.

Which lines carry GST and which do not

The energy itself is taxed. Your usage charges (cents per kilowatt-hour), your daily supply charge, and any controlled-load charge for a separately metered circuit such as hot water are all taxable supplies, so each attracts GST.

Several common fees generally do not attract GST, because they are not consideration for a taxable supply in the same way. Depending on the retailer these can include establishment and termination fees, late payment fees, disconnection and reconnection charges, and some payment-processing fees. This is why the GST line on a bill is often not exactly one-eleventh of the total — some charges below it were never in the taxable base.

If you want to see how the individual lines fit together, our guide to understanding your electricity bill walks through each charge in order.

Solar: GST is calculated before your feed-in credit

This is the detail that causes the most confusion for solar households. For a residential customer, GST is calculated on your charges first, and the solar feed-in credit is applied afterwards. The credit is not treated as reducing the taxable value of the electricity you bought — you bought that electricity, and it was taxed.

The practical consequence is that a bill can show a substantial GST amount even when the final total is small, or even in credit, because the tax was assessed against the gross charges rather than the net figure. Nothing has gone wrong when this happens; it is how the calculation is meant to work. It does, however, mean you cannot sanity-check a solar bill by dividing the final total by eleven.

For most residential solar owners, the feed-in credits themselves are not treated as taxable income and no GST is remitted on them, because the ATO generally regards a home rooftop system as a personal-use asset rather than an enterprise. That changes if you are running a business: a GST-registered entity exporting power is generally making a taxable supply and has GST obligations on those exports. If that is you, our business energy bills and ex-GST pricing guide covers the difference.

Why inclusive vs exclusive rates break plan comparisons

Residential bills in Australia usually quote rates GST-inclusive, because consumer pricing law generally requires consumers to be shown the price they will actually pay. Business bills very often do the opposite: line items are shown ex-GST with a single GST line at the end. Regulated comparison data is frequently published ex-GST as well.

So when you compare a rate you read off a residential bill against a rate you read off a comparison table, you may be comparing two different things. The gap is about 9% of the inclusive figure, which is larger than the difference between many competing plans. This is a real and common source of wrong conclusions, and it is invisible unless you go looking for it.

The defence is to make sure everything is on the same basis before you compare — and to be suspicious of any comparison that does not tell you which basis it is using. EnergySorted normalises every plan and every bill to the same GST basis before ranking anything, and checks its reading against the total printed on your bill so a mismatch shows up rather than quietly shifting the answer.

Checking your own bill

A quick sanity check: add up the charges you believe are taxable — usage, supply, controlled load — and compare 10% of that against the GST line. If it is close, your reading of the bill is right. If it is well out, look for a fee that is not taxable, a credit that was applied after tax, or a charge you have not accounted for.

If you want to check the whole bill rather than just the tax line, the free electricity bill estimator reconstructs an expected bill from your usage and rates, and the full comparison rebuilds your bill from its components and tells you when it cannot reproduce the printed total — which is usually the first sign that something on the bill deserves a closer look. Upload a bill to check it.