Free tool
Business energy contract end date checker
Most businesses that end up on deemed rates did not choose them — they missed a date. Enter yours and see exactly when your switching window opens, when notice is due, and what waiting would cost.
When can you switch, and what does waiting cost?
Your contract end date is on your bill, your welcome letter, or available from your supplier if you ring and ask — they have to tell you.
Enter your contract end date to see your switching window.
Indicative only. Notice periods, rollover terms and early termination charges are set by your own contract, so check the principal terms rather than relying on this. Rate ranges are the same figures published in our business energy rates guide and are refreshed as the market moves — your actual price depends on your meter, postcode, consumption and credit position.
Switching windows: common questions
When can I switch business energy supplier without a penalty?+
Generally you can agree a new contract up to about six months before your current one ends, with the new supply starting on your existing end date — no early termination charge, because you are not leaving early. Switching mid-term usually does trigger a charge. The date that matters is your contract end date, not the date your renewal letter arrives.
What are deemed rates and why do they cost so much?+
Deemed or out-of-contract rates are what you pay when no contract is in place — after one ends, or when you move into premises without agreeing terms. They commonly run 33–45p per kWh for electricity against 23–30p on a negotiated fixed contract, because the supplier is pricing the risk of a customer who could leave at any moment. There is no notice period on deemed rates, so you can move as soon as a new contract is agreed.
Where do I find my contract end date?+
It is usually on your bill, and always on your original welcome letter or contract. If you cannot find either, ring your supplier and ask — they are required to tell you. Write it down somewhere you will see it six months before it lands, because missing it is the single most common avoidable cost in business energy.
What is a notice period and does it still apply?+
Some business energy contracts require you to give notice before the end date if you intend to leave. Ofgem rules have limited automatic rollovers, but notice terms still vary by supplier and contract, so check your principal terms rather than assuming. Missing a notice deadline can mean rolling onto out-of-contract rates even if you had every intention of switching.