When Can You Switch Energy Supplier Without a Penalty?

Last updated: Wednesday 21 October 2026 (Europe/London).
Next update: when Ofgem announces the January to March 2027 price cap, or if Ofgem or Citizens Advice change their switching guidance.
By: Switch Editorial Team, Switch Squid Ltd

As of 21 October 2026, you can switch energy supplier without an exit fee at any time if you are on a standard variable (price cap) tariff, or once you have 49 days or less left on a fixed deal. With 50 days or more left, your supplier can charge an exit fee, so switch early only if the saving beats the fee; the price cap is £1,723 a year for a typical dual-fuel home until 31 December 2026. Your new supplier handles the switch, which should take no more than 5 working days, and you have 14 days to change your mind. This SwitchSquid guide explains the 49-day rule, the exceptions for debt and prepayment, and how to work out whether paying an exit fee is worth it. We may earn a commission if you compare or switch through links on this page; it doesn’t change the price you pay.

Sources: Citizens Advice — switch energy supplier or tariff, Ofgem — switch your home energy supplier and Ofgem — price cap unit rates and standing charges (all checked on 21 October 2026).

Compare home energy deals for your postcode (MoneySuperMarket)

The Ofgem price cap for a typical dual-fuel home on Direct Debit is £1,723 a year from 1 October to 31 December 2026, when we checked on 21 October 2026
On a variable tariff or in the last 49 days of a fix, you can switch with no exit fee
Main limitation: not every supplier or tariff appears on every comparison, and the cap limits unit rates, not your total bill

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The 49-day rule in plain English

Every fixed energy tariff has an end date. Citizens Advice explains that if you have 49 days or less left on your fixed contract, you can switch supplier or tariff without paying an exit fee. That final stretch is often called the switching window.

If you have 50 days or more left, your supplier is allowed to charge an exit fee for leaving early, as long as the fee is in your tariff terms. Not every fixed tariff has one, so check your terms or your latest bill before you assume you will pay.

If you are on a standard variable tariff, the rule is simpler still. There is no fixed term, so you can switch whenever you like, with no exit fee. When a fixed deal ends and you don’t choose anything else, Citizens Advice says you will usually be moved onto your supplier’s standard variable tariff, which follows the price cap.

The 49 days are counted back from your contract end date, which you will find on your bill, in your supplier’s app or in the renewal letter your supplier sends before the fix finishes.

When can you switch without a penalty? Every situation at a glance

This table sets out the main situations, based on Ofgem and Citizens Advice guidance, checked on 21 October 2026.

Your situation	Can you switch?	Exit fee?	What to check
Standard variable (price cap) tariff	Yes, at any time	No	Compare the yearly cost at your usage against fixed deals
Fixed tariff, 49 days or less left	Yes	No	Ask for a switch date that suits you, such as the day your fix ends
Fixed tariff, 50 days or more left	Yes	Possibly, if your terms include one	Whether the saving from switching is bigger than the fee
Owe your supplier money for less than 28 days	Yes	Depends on your tariff	The debt is added to your final bill
Owe your supplier money for more than 28 days	Not until the debt is repaid	Not applicable	Speak to your supplier about a repayment plan
Prepayment meter with up to £500 of debt	Yes	Depends on your tariff	Your new supplier must offer a prepayment tariff
Changed your mind after agreeing a switch	Yes, cancel within 14 days	No fee in the cooling-off period	Tell the new supplier as soon as possible
Landlord pays the bills, or you are on a heat network	No, you can’t switch yourself	Not applicable	Ask your landlord, or check your heat network’s terms

The debt and prepayment rules come from Ofgem’s switching guidance. The cooling-off period starts the day after you agree a contract with the new supplier, according to Citizens Advice.

Is it worth paying an exit fee to switch early?

Sometimes it is. Citizens Advice says you might save more by switching even if you have to pay an exit fee, so treat the fee as one cost in the sum rather than a reason to stay put. Here is how to work it out:

Find the fee. Exit fees are usually charged per fuel, so a dual-fuel home may pay it twice. Your tariff terms or bill will show the amount.
Count the months left. You only save money for the months you would otherwise have stayed on the old deal.
Compare the cost over those months. Work out what you would pay on your current tariff and on the new one for the same period, at your own usage.
Subtract the fee from the saving. If the answer is still positive, switching early pays.

A worked example with round numbers: say your fix has 4 months left and an exit fee of £75 per fuel, which is £150 for gas and electricity. If a new tariff would cost £120 less than your current one over those 4 months, you would lose £30 by leaving early. If it would cost £200 less, you would be £50 better off. As one real example, So Energy lists exit fees of £75 per fuel on its 12-month fixes, which is why checking your own supplier’s figure matters.

If the sum is close, waiting is usually the safer choice. Once you reach the last 49 days, you can move for free. Our energy exit fees guide looks at fees in more detail.

Worked out the exit fee? Compare the saving

Compare the yearly cost at your own usage, not just the unit rate
Check whether a new fixed deal has its own exit fees
Capped rates average 26.32p per kWh for electricity and 7.97p for gas

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Why the timing matters this winter

Ofgem’s price cap for 1 October to 31 December 2026 is £1,723 a year for a typical dual-fuel home paying by Direct Debit. The capped electricity rate averages 26.32p per kWh with a 54.83p daily standing charge, and gas averages 7.97p per kWh with a 29.68p daily standing charge, when we checked on 21 October 2026.

The cap limits the unit rate and standing charge on standard variable tariffs. It doesn’t limit your total bill, so a cold month still costs more. If your fix ends this winter, you will usually roll onto your supplier’s capped variable tariff, which then changes every three months.

Ofgem will announce the cap for January to March 2027 before it starts. Our January 2027 price cap forecast tracks what analysts expect, and our price cap guide explains how it works. If you are weighing a new fix against staying variable, our cheapest fixed energy deals guide lists this month’s options.

Hands writing in an open paper diary at a kitchen table with a plum pen and a cup of tea beside it

How to switch energy supplier without a penalty, step by step

Check your tariff and end date. Look at your latest bill or log in to your supplier’s app. Note whether you are on a fixed or variable tariff and when any fix ends.
Count back 49 days. If you are inside that window, or on a variable tariff, you can switch without an exit fee.
Gather your details. Ofgem says your new supplier will need your postcode, current supplier and tariff, your unit rate and your yearly usage in kWh.
Compare tariffs at your usage. Look at the yearly cost, not just the unit rate, and check whether the new deal has its own exit fees.
Agree the switch with your new supplier. You don’t need to contact your old supplier, because the new one arranges it.
Choose your switch date. Citizens Advice says you can switch as soon as possible, which can take up to 5 working days, or wait until after the 14-day cooling-off period. If you want to switch on the day your fix ends, ask the new supplier.
Take a meter reading on switch day. Give it to your new supplier so you aren’t billed twice for the same energy.
Pay your final bill. Your old supplier should send it within 6 weeks, and must refund any credit within 10 working days of sending it.

Our step-by-step guide to switching energy supplier covers each stage in more depth.

What if the switch goes wrong?

Ofgem sets guaranteed standards for switching, and suppliers must pay compensation when they miss them:

Slow switch: suppliers must move your supply within 5 working days. If they don’t, your new supplier must pay you £40 automatically.
Switched by mistake: you could get £40 if your supply is switched without your permission, and your old supplier has 21 working days to switch you back.
Late compensation: if a supplier doesn’t pay compensation within 10 working days, it must pay an extra £40.

If you are still unhappy, you can complain to the supplier and then to the Energy Ombudsman.

Switching with debt, prepayment or as a renter

Owing money doesn’t always stop you switching. Ofgem says you can switch if you have been in debt to your supplier for less than 28 days, with the debt added to your final bill, or if you have a prepayment meter and owe up to £500. If you have been in debt for more than 28 days, you will need to clear it first. Our guide to switching if you owe money explains the options.

Prepayment customers need a supplier that offers a prepayment tariff, and not every supplier does. See our guide to switching with a prepayment meter.

Tenants who pay the supplier directly can usually switch, but should check the tenancy agreement first. Our guide to switching when renting covers what landlords can and can’t require.

Not sure where you stand? Ask Squid AI, SwitchSquid’s AI deal assistant, to explain what your tariff end date means for your switch.

Frosty back garden seen through a misted kitchen window on a winter morning, a lilac mug on the sill

Fit summary

Switch now: you are on a standard variable tariff, or your fix has 49 days or less left.
Do the sum first: you have 50 days or more left and your tariff has an exit fee.
Sort the basics first: you have owed your supplier money for more than 28 days, or your landlord pays the bills.

Important conditions

Exit fees only apply if they are in your tariff terms, and they are usually charged per fuel.
The price cap limits unit rates and standing charges, not your total bill.
A new fixed tariff may have its own exit fees, so read the terms before you agree.
The 14-day cooling-off period starts the day after you agree the new contract.
Prepayment customers can switch with debt of up to £500, but need a supplier with a prepayment tariff.

Final decision card

On a variable tariff or inside the last 49 days of a fix? You can switch with no exit fee, so compare at your usage now.
More than 49 days left? Switch early only if the saving beats the fee.
Fix ending this winter? Compare before it ends so you don’t simply roll onto the capped variable rate.

Check energy deals before your fix ends

Have your latest bill, tariff end date and yearly kWh ready
Your new supplier arranges the switch within 5 working days
You have 14 days to cancel after you agree to switch

Check availability

FAQ

When can I switch energy supplier without a penalty?

You can switch without an exit fee at any time if you are on a standard variable tariff. On a fixed tariff, you can switch for free once you have 49 days or less left on your contract. With 50 days or more left, your supplier may charge an exit fee if your terms include one.

What is the 49-day rule for energy?

It is the rule that lets you leave a fixed energy tariff without an exit fee in the final 49 days of the contract. Citizens Advice says that if you have 49 days or less left, you can switch supplier or tariff. It gives you time to compare and move before the fix ends.

Can I switch energy supplier if I am on the price cap?

Yes. Standard variable tariffs, which follow the price cap, have no fixed term and no exit fees. You can switch whenever a cheaper tariff suits you.

How much is an energy exit fee?

It depends on your supplier and tariff, and the amount is set out in your tariff terms. Fees are usually charged per fuel, so dual-fuel customers may pay twice. As an example, So Energy lists £75 per fuel on its 12-month fixes.

How long does it take to switch energy supplier?

Ofgem says suppliers must switch you within 5 working days. If they don’t, your new supplier must pay you £40 automatically. You can also choose to switch after your 14-day cooling-off period ends.

Can I switch energy supplier if I owe money?

You can if you have owed your supplier money for less than 28 days, because the debt is added to your final bill. Prepayment customers can switch with debt of up to £500. If you have been in debt for more than 28 days, you will need to repay it first.

Can I cancel an energy switch?

Yes, you have 14 days to cancel without a fee, starting the day after you agree the contract. Tell your new supplier as soon as possible. If you haven’t been switched yet, you will simply stay with your old supplier.