Business Gas, Explained for People Who Have a Business to Run

If you run a cafe, a workshop, an office or a shopfront anywhere in NSW, Victoria, Queensland, South Australia, Tasmania or the ACT, there is a fair chance a gas bill arrives every couple of months and gets paid without much ceremony. That is a perfectly rational way to treat it. You have a business to run, and the bill is written as if the last thing anyone wanted was for you to understand it.

This is the orientation nobody gave you. Ten minutes here and you will know how small business gas actually works, what the strange codes on your bill mean, and where the money genuinely moves. The business electricity side is a separate conversation with separate levers, and worth having too.

Most small businesses are on market plans, whether they chose one or not

Small business gas mostly runs on market plans that look structurally similar to residential ones: a daily supply charge (a fixed amount for being connected, charged whether you use any gas or not) plus usage rates charged per megajoule, and those usage rates are very often stepped. Stepped means the first block of megajoules in a billing period is charged at one rate, the next block at another, and so on. The shape matters, and we will come back to it.

Bigger gas users are a different world. Past a certain annual consumption, businesses move onto individually negotiated contracts with bespoke pricing, and the published market plans stop applying to them. That boundary is set by an annual consumption threshold, and unlike the electricity threshold it is the same figure everywhere: 1 terajoule of gas a year, which is 1,000 gigajoules, or a million megajoules. The Australian Energy Regulator states the small business customer thresholds as 100 MWh a year for electricity and 1 TJ a year for gas (AER, Compliance Check 2020-01), and Victoria arrives at the same gas figure by its own route, defining a small customer as one consuming not more than 1,000 GJ a year in the Essential Services Commission's Energy Retail Code of Practice. Both checked 30 July 2026. If you are reading this and your gas bill looks like a normal retail bill with published rates on it, you are almost certainly on the small-customer side of that line, which means the whole comparable market applies to you.

That is good news, by the way. It means your price is not a private negotiation you have to win. It is a published number you can compare.

The anatomy of the bill itself

A handful of items on a gas bill are worth actually knowing. The rest is decoration.

Your MIRN. The Meter Installation Registration Number is the unique identifier for your gas connection, the gas equivalent of the electricity NMI. It identifies the physical connection point, not you and not your retailer. If you ever switch retailers, compare plans, or query a bill, the MIRN is how anyone knows which connection you are talking about.

The read type. Somewhere on the bill it will say whether the reading was actual or estimated. This matters more for gas than most people realise, because gas meters are physically read roughly every two months. Between actual reads, retailers estimate. An estimate that runs low gets corrected by a catch-up bill when the real read arrives, and for a business managing cash flow, a catch-up bill landing in a tight month is not a pricing problem, it is a timing problem. Knowing whether you are looking at an actual or estimated read tells you whether the number in front of you is measurement or forecast.

The stepped usage rates. Your bill will typically show usage charged in blocks: so many megajoules at one rate, the remainder at another. Which block your usage reaches decides which rate is doing most of the work on your bill. A plan with an attractive first-block rate can be structured quite differently in its later blocks, which is exactly why plans cannot be compared on the headline rate alone. If your premises burns gas in volume, the heavy-user guide is where that inversion is worked through properly.

The supply charge. The fixed daily amount. For a low-usage site it can be a meaningful share of the bill; for a heavy-usage site it fades into the background. Either way, it is part of the total and belongs in any comparison.

GST. The bill states its own GST line, and that stated line is the figure to trust. A sensible cross-check is that GST on a fully taxable bill should equal the total divided by eleven, but when you are extracting numbers from a bill, the bill's own printed GST line is authoritative. If your business is registered for GST, that line is also the input credit conversation with your accountant, not with your energy retailer.

Wrinkles that only apply to businesses

Two things routinely trip up business owners that a household never has to think about.

Multiple sites means multiple MIRNs. Each connection point has its own MIRN, its own meter, its own bill, and possibly its own price. If your sites sit in different distribution zones, the network component of the price can differ between them even on the same retailer and the same plan name. The practical consequence: a plan that is right for one site is not automatically right for the others, and each site deserves its own comparison. Nobody enjoys hearing that, but it is where real money hides for multi-site operators.

Winter-weighted trades should compare on a full year. Hospitality venues, laundries, and any premises where heating is a serious load all burn far more gas in winter than in summer. If you compare plans using one quarter of usage, you are comparing on a season, not on your business. A plan that looks sharp on your quiet summer quarter can price your winter quite differently, particularly where seasonal rates or stepped blocks are involved. The honest comparison uses a full year of your actual usage, so both your heavy and light periods are priced under every plan's real structure.

Why nobody has done this properly for business gas

Household electricity gets compared constantly. Business gas, almost never. The comparison funnels that exist were largely built for households, often cover only the retailers who pay to appear, and rarely handle the things that make a business bill a business bill: stepped blocks read off real usage, multiple sites, seasonal weighting, estimated reads. And because the two fuels are priced by completely different machinery, each one needs its own diagnosis rather than a single line called "energy costs".

Meanwhile the data to do it properly is public. Australian retailers publish their plans through the Consumer Data Right, and as at 30 July 2026 there were 2,430 active gas plans in the public CDR data. That is the actual size of the market you are choosing from, and it is a market almost no small business has ever seen laid out in one place.

That is the gap Fix Your Bill exists to close. We read your actual bill, take your real usage over a real period, and price every retailer in your state against it, whether they have a commercial arrangement with anyone or not. Not a shortlist, not a panel, the whole market, sorted by what your business would actually pay. Your bill already contains everything needed to do it. All you have to do is let us read it.