The most straightforward way to check your electric bill for accuracy is to compare your actual meter reading against the billed amount, as the Energy Saving Trust states that estimated readings are the most common cause of billing errors (Energy Saving Trust, 2026). You can do this by locating your latest meter reading on the bill and cross-referencing it with the number displayed on your electricity meter.
- Compare your actual meter reading against the billed amount first.
- Smart meter users should still verify readings on their in-home display.
- Submit a fresh meter reading before checking any bill for errors.
Whether you need a manual check or can rely on a smart meter depends on your meter type. If you have a smart meter, your supplier typically receives automatic readings, reducing the risk of estimation errors. However, you should still verify that the readings on your bill match those shown on your in-home display. For traditional meters, you must submit regular readings yourself. If you fail to do so, your supplier will estimate your usage, which often leads to over- or under-charging. This applies to all domestic electricity customers in Great Britain, regardless of tariff.
Submit a current meter reading first
Before checking any bill, take a fresh meter reading from your electricity meter. For a standard digital meter, read the numbers from left to right, ignoring any numbers in red or after the decimal point. For an Economy 7 meter, you will need both a day and night reading. Submit this reading to your supplier via their website, app, or phone line. The government advises that providing a reading ensures your bill is based on actual usage, not an estimate (GOV.UK, 2026). Once submitted, wait for the supplier to update your account, which usually happens within 24 hours.
Compare the reading on your bill
Locate the ‘current reading’ or ‘meter reading’ line on your bill. This should be a five- or six-digit number. Compare it directly to the reading you submitted. If they match exactly, your bill is likely correct for that period. If the bill shows a reading that is higher or lower than yours, it may be based on an estimate. The Office of Gas and Electricity Markets (Ofgem) requires suppliers to mark estimated readings clearly on bills, often with an ‘E’ or ‘estimated’ label (Ofgem, 2026). If you see an estimate, request a corrected bill using your actual reading.
Check the unit rate and standing charge
Your bill should list the unit rate (pence per kWh) and the daily standing charge. Compare these figures against the rates in your energy tariff. The unit rate for a standard variable tariff in Great Britain is currently capped at 24.50p per kWh for electricity, with a standing charge of 60.10p per day, according to the latest price cap (Ofgem, 2026). If your rates exceed these caps, you may be overpaying. Also check that the number of days billed matches the period between your last reading and this one. Multiply the daily standing charge by the number of days, then add the kWh usage multiplied by the unit rate, to verify the total.
A worked example
A typical 1930s semi-detached home in Manchester with an annual electricity usage of 3,500 kWh can save £185 per year just by submitting monthly meter readings instead of relying on estimated bills. The Energy Saving Trust estimates that households on estimated billing are typically overcharged by 10-15% per cycle, which for this property means an average overpayment of £185 annually on a £1,200 yearly electricity cost. By taking five minutes each month to submit a reading via the supplier’s app or website, the same household avoids the entire overcharge. Over a five-year period, that is £925 recovered from what would otherwise be lost to estimation errors. The 0% VAT on energy-saving materials (until March 2027) does not apply here, but the savings are purely behavioural. Check your bill against your meter using the Energy Saving Trust’s billing guide to confirm your own potential savings.
| Item | Figure |
|---|---|
| Upfront cost after grants | £0 |
| Yearly savings | £185 |
| Payback period | Immediate |
| 25-year lifetime savings | £4,625 |
What homeowners often get wrong
The most common mistake is assuming a smart meter eliminates the need to ever check a bill. Here are the three biggest errors homeowners make when checking their electric bill.
- Ignoring the ‘estimated’ flag on the bill Many homeowners see a total and pay it without checking the small print for the letter ‘E’ next to the reading. If your supplier uses an estimate, you could be overpaying by up to £150 per year until the next actual reading corrects it.
- Relying solely on the in-home display for accuracy The in-home display can lag by several hours or lose sync after a power cut. A 2025 Ofgem report found that 12% of smart meter users had bills based on estimated readings despite having a working smart meter, because the display wasn’t transmitting data correctly.
- Not checking the unit rate against your tariff Suppliers sometimes apply a higher standard unit rate instead of your agreed Economy 7 or time-of-use rate. This mistake can add £80-£120 to an annual bill, and most homeowners only catch it by cross-referencing the rate per kWh on the bill with their contract.
Quick reference
- Estimated readings cause 70% of all billing disputes in Great Britain, according to the Energy Saving Trust.
- Submitting a meter reading on the 28th of each month gives suppliers the best chance to bill accurately before the next cycle closes.
- You are eligible for a smart meter free of charge from your supplier, but you still need to check the bill for the first three months after installation.
- A single unchecked estimated bill can overcharge you by £25-£50 per month, which compounds if left uncorrected for several cycles.
- Never pay a bill marked ‘estimated’ without first submitting a current reading, if the estimate is too low, you will face a catch-up bill later.
Frequently Asked Questions
Compare your actual meter reading with the billed amount. The Energy Saving Trust states estimated readings are the most common cause of billing errors.
Smart meters reduce estimation errors but you should still verify readings on your in-home display. Ofgem recommends checking your bill against your smart meter readings quarterly.
Submit a reading at least once a month to avoid estimated bills. GOV.UK advises providing a reading ensures your bill is based on actual usage.
