To switch business energy smoothly, find your contract end date on your latest bill or by asking your supplier, then act within your switching window — typically up to 6 months before it ends. Missing that window can roll you onto expensive out-of-contract rates, so the key is to note the date and compare early.
Business energy contracts work differently from domestic ones. Many have a fixed end date and a defined window in which you can agree a new deal — and if you miss it, you don't simply continue on the same rate. Instead you're moved onto out-of-contract rates, which are usually far more expensive. Knowing your end date, and acting on it in good time, is the single most effective way to avoid overpaying. This checklist walks you through it.
Your end date is usually printed on your energy bill, often near your account details or tariff information. If it's not clear, check your original contract paperwork or welcome letter. Still can't find it? Contact your supplier directly — or we can confirm it for you with a quick Letter of Authority (LOA), which lets us request the details on your behalf.
Most business energy suppliers let you agree a new contract in advance of your end date — commonly up to 6 months beforehand, though this varies by supplier. Some also require formal notice that you intend to leave. Knowing both the earliest you can lock in a new rate and any notice you need to give keeps you in control rather than reacting at the last minute.
Don't wait for your supplier's renewal offer and accept it by default — renewal quotes are rarely a supplier's best price. Comparing across the market well before your end date gives you time to weigh your options without pressure. We compare 15+ suppliers and send you the best deals in plain English.
Once you've chosen a rate, the switch is arranged to take effect when your current contract ends, so there's no gap and no overlap. The same supply reaches your premises through the same network — nothing physical changes, and there's no downtime.
Use this as your at-a-glance summary: find your contract end date · note your earliest switching date and any notice period · diarise a reminder a few months ahead · compare the market before accepting any renewal · confirm your new rate so it starts the moment the old contract ends.
Getting ahead of your end date is exactly how you avoid slipping onto out-of-contract rates — the costly default we cover in more detail separately.
Not sure when your contract ends? Get a free comparison → and we'll check it for you.
How do I find my business energy contract end date?
It's usually shown on your energy bill or your original contract paperwork. If you can't locate it, your supplier can tell you — or we can confirm it on your behalf with a Letter of Authority.
How early can I switch business energy?
Most suppliers let you agree a new contract in advance of your end date, often up to several months beforehand. Locking in early protects you from last-minute price pressure and from rolling onto out-of-contract rates.
What happens when my business energy contract ends?
If you haven't agreed a new deal, you're moved onto out-of-contract rates, which are typically much more expensive. Agreeing a new contract before your end date avoids this entirely.