How long to keep energy bills?

Keeping energy bills for one year costs you less than the average annual energy bill itself, around £1,700 in 2026

Every UK household generates around a dozen paper or digital energy bills each year. The question of how long to keep them is a practical one: balance the hassle of storage against the risk of needing a bill later. The answer is simpler than most people think.

The direct answer is: keep your energy bills for one to two years, unless you are self-employed, in which case keep them for six years. The average annual energy bill under the January 2026 Ofgem price cap is £1,736 (Ofgem, 2026), so the cost of storing paper bills for a year, roughly £5–10 for a folder and ink, is negligible compared to the bill itself. The real cost is the time you waste hunting for a bill you threw away too soon.

The legal minimum is one year, but the practical minimum is two years

Energy suppliers in Great Britain must keep billing records for at least 12 months under their supply licence conditions set by Ofgem (Ofgem Standard Licence Condition 27). That means a supplier cannot simply delete your billing history after a few months. However, the legal minimum for you to keep bills is different from the supplier’s obligation.

The Energy Ombudsman allows complaints up to 12 months from the date you first became aware of a problem (Energy Ombudsman, 2026). If you discover an error in a bill from January 2025, you have until January 2026 to complain. Keeping bills for two years covers the full dispute window: the year the bill was issued plus the year you might spot the mistake. If you have a prepayment meter, disputed charges can go back 18 months (Ofgem Standards of Service, 2026), so keeping records for two years still covers that period.

Quick numbers time, cost, and space for storing energy bills

Storage cost estimates are based on Office for National Statistics CPI data for stationery and an average UK home office space cost of £0.50 per square foot per month (ONS, 2026). A paper file takes up about 0.5 square feet of drawer space. Digital storage costs are near zero if you use free cloud services like Google Drive or iCloud.

After two years, the risk of needing an old bill is near zero

The Energy Ombudsman’s 12-month complaint window is the longest statutory period for disputing a bill. Energy suppliers are not required to provide billing data older than 12 months under the Data Protection Act 2018 (ICO, 2026). If you move supplier, your old supplier must keep records for 12 months after you leave, but you cannot rely on them to send you a copy, they are only obliged to provide it on request within that window.

After two years, the probability that any energy-related dispute will arise is extremely low. The ICO’s guidance on retention of personal data by energy suppliers recommends a maximum retention of 12 months for billing data unless there is a specific legal requirement (ICO, 2026). So if you have not needed a bill in two years, you almost certainly never will.

How to switch energy supplier without losing records

How long to keep energy bills for a dispute or refund claim

If you overpaid your energy supplier, Ofgem rules state they must refund you within 28 days of your request (Ofgem Standards of Service, 2026). But you need proof of payment, keep bills for the full period of overpayment, which is typically up to 2 years. For a billing error, such as estimated readings versus actual, the supplier must correct it within 12 months of the error under Standard Licence Condition 27 (Ofgem, 2026). Keep the original bill and the corrected version until the dispute is resolved.

If you claim under the Warm Home Discount or Energy Company Obligation, keep bills for the scheme year plus one year. This covers any audit or verification request from the scheme administrator. Typically, that means keeping bills from the 2025–2026 scheme year until the end of 2027.

The one rule keep your annual statement for six years if you are self-employed

If you run a business from home, HMRC requires you to keep energy bills for 5 years after the 31 January tax return deadline, that is 6 years total (HMRC, 2026). This applies even if you only use a small room for work, the energy cost is a legitimate business expense. The 6-year rule covers your annual statement or summary bill, not every monthly statement. If you are not self-employed, ignore this rule entirely.

For most homeowners, the 6-year rule does not apply. You can safely delete or shred bills after 2 years without any tax risk.

What counts as a business expense for home energy bills

How to verify a supplier’s request for old bills, and when to say no

If a supplier asks for bills older than 12 months, check their legal basis under UK GDPR. They must have a legitimate interest, not just a policy (ICO, 2026). If they cannot provide a valid reason, such as a pending dispute or a court order, you are not obliged to provide them. However, note that they may refuse a refund without them.

If the request comes from a debt collection agency, the same rules apply. Ask for their authority under the Consumer Credit Act 1974 (Legislation.gov.uk). A debt collector has no special right to demand bills older than 12 months. If they cannot produce a signed agreement or a court order, you can politely decline.

What to do with old bills, shred or scan

Shred paper bills after 2 years to prevent identity theft. Action Fraud advises that personal documents containing your name, address, and account details should be destroyed securely (Action Fraud, 2026). A cross-cut shredder costs around £20 and is a one-off purchase.

Scan and store digitally in a secure folder, such as an encrypted PDF on your computer or a password-protected cloud folder. Keep for up to 6 years if you are self-employed; otherwise delete after 2 years. Do not rely on your supplier’s online portal as long-term storage, they may delete records after 12 months without warning. Download a PDF copy of each bill when you pay it, and you will never lose access.

Best free cloud storage options for home documents