How far ahead can I agree a new business energy contract?
There is no single legal limit we could verify; it depends on the supplier and the quote. In practice you agree the new deal with a start date the day after your old contract ends, so you avoid exit fees and out-of-contract rates.
The short version
We could not find an Ofgem rule that sets a standard "earliest date" for agreeing a replacement contract, so we won't give you a number. What matters in practice is the start date of the new contract: it should fall after your current one ends. Your new supplier then takes over on that date and you never sit on a higher rate in between.
Why the start date matters more than the signing date
Signing is not the same as starting. You may be able to sign now for a contract that begins months from now, if the supplier agrees. Signing early is not what costs money. Moving your supply before the old contract ends is, because Ofgem notes that leaving a fixed-term contract early may trigger an early termination fee.
So the plan is simple: find your end date, then ask each supplier you are comparing for a start date of the following day. If you need help, see how to find your contract end date.
What limits you in practice
- Quote validity. Business prices follow the wholesale market, so quotes are usually held for a limited time only. If you collect quotes very early, they may need refreshing before you sign.
- Supplier appetite. Suppliers aren't obliged to accept every customer, and Ofgem says they may consider size of supply or credit rating. See whether your credit score affects prices.
- Your current supplier's renewal offer. Compare it with the market. For a microbusiness the renewal letter must show your current prices and annual consumption.
- Switch time. Allow for the change itself; how long a switch takes varies.
A worked timeline
Say your electricity contract ends on 31 March 2027.
| When | What to do |
|---|---|
| Well before the end | Gather your annual usage and end date |
| A few months before | Request comparisons and read the Principal Terms |
| Before any notice deadline | Sign the best offer, with start date 1 April 2027 |
| 1 April 2027 | New contract begins; old one has ended |
How many months ahead you start is your call; the point is that nothing in the table leaves you without a contract on 1 April.
There is no cooling-off period on business contracts, so check the price and exit terms before you sign, not after. See the cooling-off FAQ.
What to ask a new supplier
- Can the contract start on a specific future date, and by when must I sign to secure the quote?
- What happens if my current contract end date turns out to be different from the one I gave you?
- Do you need my meter numbers and annual usage now, or closer to the start? See what information you need to compare.
Answers may differ between suppliers, which is exactly why we avoid quoting a universal lead time. If an adviser claims there is a fixed rule, ask them to show you the source.
Next steps
- Confirm your end date for each fuel.
- Ask for a start date that follows it.
- Read the best time to switch for timing ideas.
Sources
General information only. Energy prices, rules and supplier terms change; check the latest position with your supplier, Ofgem or the Energy Ombudsman before you act.