The Complete UK Guide to Energy Direct Debits

How an energy direct debit actually works

With a fixed monthly direct debit, your supplier forecasts what your household will spend on energy over the next twelve months, then divides that forecast into equal monthly payments. You pay the same amount in July as in January, even though you use far more gas and electricity in winter.

Each month the energy you actually use is billed to your account, and your payment is credited to it. The difference between the two accumulates as an account balance — in credit when you have paid more than you have used, in debit when you have used more than you have paid.

• Variable direct debit is different: it collects the actual amount of each bill, so payments swing with the seasons.
• The Direct Debit Guarantee applies to both — you are entitled to advance notice of the amount and date, and to a refund from your bank of any payment taken in error.

How suppliers calculate your monthly payment

A supplier's forecast normally combines your annual consumption estimate, the unit rates and standing charges on your tariff, the shape of your usage across the year, and your current account balance. If you are in debit, the shortfall is usually spread across the remaining months; if you are in credit, that credit may be used to reduce the forecast payment.

The quality of the forecast depends entirely on the quality of the underlying data. An account billed on estimated readings, or one where the annual consumption figure was inherited from a previous occupant, can produce a payment that has very little to do with your household.

• Annual consumption in kWh for each fuel
• Your current tariff's unit rates (pence per kWh) and standing charges (pence per day)
• Any expected price change during the forecast period
• The current credit or debit balance, and how quickly the supplier plans to clear it
• Seasonal weighting — winter months carry much more of the annual cost than summer months

Bill, balance and payment — three different numbers

A bill or statement shows the cost of the energy you used in a given period. Your account balance shows the running difference between everything billed and everything paid. Your direct debit is the fixed instalment collected each month toward that running total.

Comparing your monthly payment with a single winter bill will almost always look alarming, and comparing it with a summer bill will almost always look generous. The only fair comparison is your annual payments against your estimated annual cost — which is what our calculator does.

Why payments rise when your usage has not obviously changed

A payment increase is not automatic evidence of a mistake. The most common causes are a change in unit rates or standing charges, a previous underpayment being recovered, a correction after a long run of estimated readings, or a forecast that has been rebuilt using more recent consumption data.

Our dedicated guide walks through each cause and the checks to make before you contact your supplier.

Estimated versus actual meter readings

Where no actual reading is available, suppliers estimate consumption. Estimates are corrected as soon as an accurate reading arrives, which can cause a sudden catch-up bill and a matching payment increase.

If your account has been running on estimates, submit a reading before you challenge anything. A recalculation based on an accurate reading resolves a large share of direct debit disputes without a complaint.

Seasonal credit and debit balances

On a fixed monthly payment, a healthy account normally builds credit through spring and summer and draws it down through autumn and winter. A balance is therefore only meaningful alongside the date it was taken.

The question is not whether you are in credit, but whether the credit you hold is roughly what your remaining winter usage will consume.

What a reasonable account credit balance may look like

There is no single correct figure, and any source that gives you one is guessing. A reasonable balance depends on your annual cost, the month, your payment amount and how accurate your readings are.

Our guide on credit balances sets out how to reason about your own number rather than adopting somebody else's.

When suppliers review direct debits

Reviews are typically triggered by an annual or periodic account review, a new meter reading, a tariff or price change, a change of tariff at the end of a fixed term, or a request from you.

You can normally ask for a review at any time. A review supported by a current meter reading and your own annual cost estimate is far more likely to result in a change than a request without evidence.

What to do if your payment looks too high

Work through the evidence before you pick up the phone. You want three things in front of you: an up-to-date meter reading, your current unit rates and standing charges, and your annual consumption in kWh for each fuel.

• Estimate your annual cost from your own rates and usage, then compare it with twelve months of payments.
• Check whether the account is in credit or debit, and by how much relative to that annual cost.
• Check whether recent bills are marked estimated or actual.
• Ask your supplier to explain the assumptions behind the payment, in writing.
• Ask for a recalculation based on your latest actual reading if the assumptions look wrong.

How to request a refund of excess credit

Suppliers will normally ask for a recent meter reading before refunding credit, because a refund calculated from an estimate can push the account into debit. Refunds can also cause the direct debit to be recalculated upward, so it is worth understanding the trade-off before requesting the full balance.

What happens if you cancel the direct debit

Cancelling the instruction at your bank stops the collection. It does not cancel what you owe, and it may move you off direct debit pricing onto a different payment method with different rates under the price cap.

If the payment is unaffordable, speak to the supplier first — there are safer routes than cancelling.

If you cannot afford the proposed payment

Suppliers are expected to work with customers who are struggling, and there are established routes for affordable payment arrangements and additional support. Independent help is free.

• Ask the supplier for an affordable payment plan based on what you can genuinely pay.
• Ask whether you are eligible for the Priority Services Register or any support schemes the supplier operates.
• Get free independent advice from Citizens Advice before agreeing to anything you cannot sustain.

How to complain and escalate

Start with the supplier's own complaints process and keep a written record. If the complaint is unresolved after eight weeks, or you receive a deadlock letter, you can take it to the Energy Ombudsman free of charge. The Ombudsman's decision is binding on the supplier if you accept it.