Understanding your energy bill in Belgium: advance payments, annual settlement and the price per kWh explained

A Belgian energy bill is read in two stages: the advance payments you make each month, and a once-a-year settlement that literally brings the meters up to date. Understanding this mechanism, and knowing what the price per kWh is made of, is what separates a household that endures its bill from one that controls it. Here is how to decode every line, spot an anomaly, and know which levers you can actually pull.

What exactly does your energy bill contain?

Two types of document, not one: advance-payment invoices throughout the year, then an annual settlement invoice that does the reckoning.

This is the first source of confusion. What you receive most often are advance-payment invoices: provisions calculated in advance. Once a year, your supplier issues a settlement invoice that compares your actual metered consumption with the total you have already paid. The balance is either refunded or claimed. Everything else — the price per kWh, network costs, taxes, VAT — is itemised in this annual settlement.

Advance payment: what are you paying each month?

An estimate, not your actual consumption. The advance payment is a provision set in advance based on your history and your contract price.

The supplier estimates your annual consumption — most often from your readings in previous years, or an average over the last three years — then multiplies it by the price set in the contract and spreads the total across monthly instalments. For a fixed contract, the advance payment rests on estimated consumption and a price known in advance. For a variable contract, the price used is itself an estimate, since it moves every month (CREG / TotalEnergies, 2026).

In other words, the advance payment is never the accounting truth: it is a smoothing device. You pay a steady amount to avoid one hefty bill at year-end.

Settlement invoice: why this annual reckoning?

Because at least once a year, your actual consumption has to be compared with what you provisioned.

The settlement takes your meter readings at the start and end of the period, derives your actual consumption in kWh, values it at your contract price, adds network costs and taxes, then subtracts the total advance payments already made. In principle, each customer receives at least one settlement invoice per year (CREG, 2026). If you paid too much, you are refunded; if your advance payments covered less than your consumption, a supplement is claimed.

Why can your advance payment change from one year to the next?

Because it follows your actual consumption and the movement of prices. After each settlement, the supplier recalibrates the advance payment.

If your settlement reveals higher consumption than expected, next year's advance payment rises to avoid another supplement. Conversely, lower consumption — after insulation work, for instance — brings the advance payment down. Prices matter too: on a variable contract, a lasting market increase feeds through to the provision. That is why comparing your advance payment with your actual consumption, every year, avoids nasty surprises.

How is the price per kWh on your bill calculated?

It adds up four components, and only one truly depends on your supplier.

The total price you pay per kWh breaks down as follows: the energy component set by the supplier, network costs (transmission and distribution), levies and taxes, and VAT. In Wallonia, the split observed in 2026 is:

These proportions come from Test-Achats and CallMePower (2026) for Wallonia; the CREG for its part puts network costs at around 29% on average nationwide. The figures therefore vary by region and method, but the principle is the same everywhere.

On your bill, only the energy component is negotiable. Network costs and taxes are identical whichever supplier you choose.

This is a decisive point: when you compare offers, you only move a fraction of the bill — but it is the only fraction you have any control over.

Why do you pay 6% VAT on energy?

Because the residential rate was cut from 21% to 6%, then made permanent.

During the energy crisis, the government lowered VAT on household gas and electricity from 21% to 6%, before making that cut permanent (CREG, 2026). It applies to all components of the bill, including network costs. It is today the smallest of the four building blocks of the price, but it has a mechanical effect: any rise in the other items is also taxed at 6%.

How do you check that your bill is correct?

By checking three things: the period, the meter readings and the unit price applied.

Start with the billing period: it must match reality. Then check the meter readings at the start and end — if they are estimated rather than read, consumption may be wrong and will be corrected later. Finally, check the unit price: it must match your contract. An average Belgian household uses about 3,500 kWh of electricity and 17,000 kWh of gas per year (CallMePower / Selectra, 2026): if your bill strays far from these benchmarks without reason, find out why.

If in doubt, each has its point of contact: the supplier for the energy component and the contract, the network operator (ORES, Fluvius, Sibelga…) for network costs, and the regional regulator (CWaPE in Wallonia, VREG in Flanders, Brugel in Brussels) to arbitrate a dispute.

Bill too high: how do you bring it down?

By acting on the only levers you control: consumption, contract type and supplier.

Cutting consumption (insulation, efficient appliances, controlled heating) acts on the volume of kWh. Choosing the right contract type acts on the price: our guide on the fixed, variable or dynamic contract details the trade-off for your profile. And comparing suppliers gives you the best possible energy component: that is the starting point, in the energy supplier ranking. If your income allows, also check your eligibility for the social energy tariff, which caps the price per kWh for eligible households.

Key takeaways

The figures cited here — a split of roughly 56% energy, 21% network, 17% levies and 6% VAT in Wallonia (Test-Achats / CallMePower, 2026), residential VAT at 6% (CREG, 2026), average consumption of 3,500 kWh of electricity and 17,000 kWh of gas per year (CallMePower / Selectra, 2026) — are orders of magnitude that vary by region, supplier and household profile. On a variable contract, prices move every month: always recheck your rate schedule before comparing. And to act on the only negotiable part of your bill, start with the energy supplier ranking.