Is your energy direct debit too high, too low, or about right?
Your energy direct debit should be based on what you are likely to use over a full year, not just what you used last month. The idea is simple: you pay the same amount each month, build up credit during cheaper months, then use that credit during winter when your energy use is higher.
The problem is that direct debits are not always set correctly. If your payment is too high, your supplier may build up more credit than you really need. If it is too low, your account can fall into debt and you may face a sharp increase later.
This calculator helps you check whether your current monthly payment looks fair based on your annual gas and electricity usage, tariff rates, standing charges and account balance.
What you need to use the calculator
To get the most accurate result, use figures from a recent bill or your supplier’s app. You will usually need:
- Your annual electricity usage in kWh
- Your annual gas usage in kWh, if you have gas
- Your electricity and gas unit rates
- Your daily standing charges
- Your current account balance
- Your current monthly direct debit
If you do not know your exact annual usage, use the annual estimate shown on your bill. The result will still give you a useful guide, but actual usage is always better than a supplier estimate.
How energy direct debits are calculated
Suppliers usually calculate your direct debit by estimating your annual energy cost, then spreading it across 12 monthly payments.
That annual cost is based on your expected usage, your unit rates, your standing charges and VAT. If you already have credit or debt on the account, your supplier may also adjust the monthly payment to bring the balance back into line over time.
In simple terms, your direct debit should cover two things: your expected future energy use and any existing account balance that needs correcting. A fair payment is not always the lowest possible payment. It is the amount that keeps your account on track without building unnecessary credit or debt.
Why your energy direct debit changes
Your direct debit can change even if you have not changed supplier. The most common reasons are:
- Your energy usage has gone up or down
- Your tariff rates have changed
- Your fixed tariff has ended
- Your account has built up too much credit
- Your account has fallen into debt
- Your supplier has updated its annual usage estimate
- You have submitted new meter readings
- Your home circumstances have changed
Working from home, a new baby, a lodger, an electric vehicle, solar panels, a heat pump or new appliances can all change your annual usage. If your usage changes, your direct debit may need to change too.
What is a healthy energy account balance?
A healthy account balance depends on the time of year. It is normal for your balance to move up and down because your monthly payment stays fairly steady while your usage changes with the seasons.
In summer, many households build up credit because energy usage is lower. In winter, that credit is used up because heating and lighting costs are higher.
As a rough guide, being in credit by late summer is normal. Being slightly in debit after winter can also be normal, as long as the account recovers during spring and summer. The warning sign is when your balance keeps growing in either direction and does not return to a sensible level over the year.
Why your direct debit may be too high
Your direct debit may be too high if your account keeps building credit and your supplier is holding more money than needed for your winter usage.
This can happen if your supplier has overestimated your usage, failed to adjust after prices fell, or set your payment based on old data. It can also happen if your circumstances have changed, such as using less energy, installing solar panels, improving insulation or moving to a cheaper tariff.
If your account is heavily in credit, submit an up-to-date meter reading and ask your supplier to review the payment. You can also ask for credit to be refunded. Citizens Advice says you can contact your supplier and ask them to refund credit, and you will usually need to provide an up-to-date meter reading.
Why your direct debit may be too low
A low direct debit can feel helpful at first, but it can cause problems later. If your payment does not cover your real annual cost, your account may drift into debt.
This often happens when a supplier underestimates usage, prices rise, or a household starts using more energy. It can also happen after moving into a new home, because the first direct debit may be based on previous occupants or limited usage data.
If your account is already in debt before winter, your direct debit may be too low. Increasing it sooner can be less painful than waiting for a large catch-up bill or a sudden payment increase later.
Why summer credit is not always overpayment
Seeing credit on your energy account does not automatically mean your direct debit is too high. Some credit is normal, especially during spring and summer.
That credit acts as a buffer for winter, when your monthly energy cost may be higher than your direct debit. The key question is whether the credit is reasonable for the time of year and your expected winter usage.
The calculator above estimates whether your current balance looks sensible based on your annual cost and monthly payment. That is more useful than looking at the credit figure on its own.
What to do if your direct debit is wrong
If your direct debit looks too high, submit a meter reading and ask your supplier to review the payment. If your account has excess credit, ask for a refund or a lower monthly payment.
If your direct debit looks too low, consider increasing it before the debt grows. A small adjustment now is usually easier than a large increase later.
If you disagree with your supplier’s calculation, ask them to explain how they worked it out. They should be able to show the usage, rates, standing charges and balance used to calculate your monthly amount.
Can you get credit refunded from your energy supplier?
Yes, you can ask your supplier to refund credit from your account, although they may want to check that the refund will not leave the account underfunded.
Citizens Advice recommends contacting your supplier, asking for the amount you want refunded, and providing an up-to-date meter reading.
If you have switched supplier or closed an account, the rules are stricter. Ofgem says suppliers have six weeks from a switch to send a final bill, then 10 working days from the final bill to automatically refund a credit balance.
How often should you check your direct debit?
It is worth checking your direct debit at least every three months, especially when your tariff changes, your supplier updates its rates, or your usage changes.
You should also check it before winter and after winter. Before winter, you want to know whether you have enough credit built up. After winter, you want to check whether your account is recovering properly.
If your supplier changes your payment and the new amount does not look right, use the calculator again with your latest figures.
Direct debit calculator FAQs
Why has my energy direct debit gone up?
Your direct debit may have increased because your usage estimate has risen, your tariff rates have changed, your account is in debt, or your supplier is trying to build a winter credit buffer.
Why is my energy account in credit?
Your account may be in credit because you have paid more by direct debit than the energy you have used so far. This is common in spring and summer, when usage is lower.
Does being in credit mean my direct debit is too high?
Not always. Some credit is normal before winter. Your direct debit may be too high if the credit keeps building beyond what is reasonably needed for future usage.
Can I lower my energy direct debit?
Yes, but your supplier may ask for an up-to-date meter reading and may refuse if lowering the payment would leave your account underfunded. If you think the payment is wrong, ask them to explain the calculation.
Can I get my energy credit refunded?
Yes, you can ask your supplier for a refund of account credit. You will usually need to provide an up-to-date meter reading so they can check the balance is accurate.
Is it bad to be in debit with my energy supplier?
A small debit after winter can be normal if your account recovers during spring and summer. A growing debit, or being in debt before winter, usually means your direct debit is too low.
Should I pay for energy by direct debit?
Direct debit is often one of the cheaper ways to pay for energy, but it does mean your supplier estimates your monthly payment. You should check it regularly to make sure it still matches your usage.
How accurate is this calculator?
The calculator gives an estimate based on the figures you enter. It cannot predict weather, future price changes or changes in your household usage, but it can help you check whether your current direct debit looks reasonable.