Fixed energy tariff ending soon? How to switch confidently in the UK
If your fixed deal is due to end, you’ll usually move to your supplier’s variable tariff (often the price cap). This guide explains the best time to compare, what to check (exit fees, meter type, payment method), and how to switch without gaps in supply.
- Get a clear “what happens next” timeline and the checks that matter
- See example scenarios with realistic UK assumptions and estimated costs
- Compare fixed vs variable vs tracker-style options (where available)
Estimates only. Prices and availability vary by region, meter type and payment method. Switching never interrupts your supply.
Fast answer: what to do when your fixed tariff is ending
When your fixed tariff ends, your supplier will usually move you onto their standard variable tariff (SVT) unless you choose another deal. You can usually switch up to 49 days before your end date without paying an exit fee (if your tariff has one), but always check your tariff terms.
Most people’s “best move”: start comparing about 4–7 weeks before your fixed deal ends, confirm any exit fee window, then switch if a suitable tariff is available for your meter and payment method.
Key takeaways
- No supply disruption: switching changes billing only, not the pipes/wires.
- Check exit fees: many fixed deals charge a fee if you leave early, but it may be waived in the final 49 days.
- Match your setup: deals vary by region, payment method (Direct Debit vs prepay) and meter type (credit, smart, Economy 7).
- Price certainty vs flexibility: fixed tariffs can protect against rises; variable can fall if the cap reduces.
Before you compare, gather
- Your postcode (pricing is region-based)
- Your payment method (monthly Direct Debit, pay on receipt, or prepayment)
- Your meter type (standard/smart, Economy 7, prepay)
- Estimated annual usage in kWh (from your bill/app) if possible
- Your tariff end date and any exit fee
If you’re not sure when your fix ends, check your latest bill, your online account, or your supplier’s welcome email. You can also ask them to confirm the end date and whether an exit fee applies.
Compare fixed deals and switch options (whole-of-market)
Use the form to get a tailored quote based on your postcode and setup. We’ll show suitable options available to you, then you can choose whether to proceed.
Good to know: If you’re currently on a fixed deal, switching too early can trigger an exit fee. If you’re within the final weeks of your contract, you may be able to switch without one (check your terms).
What happens after you submit
- We match tariffs available for your region, meter and payment method.
- You review estimated costs, key terms and any exit fees.
- If you choose to switch, your new supplier handles the changeover (no engineer visit in most cases).
Get your quote
How switching works when your fixed tariff is ending
In the UK, switching supplier is an administrative change. Your energy continues to flow as normal, and you keep the same meter unless you’re changing meter type (for example, moving to or from prepayment).
Typical timeline
- 4–7 weeks before your end date
- Compare deals, check exit fee rules, and consider whether you want price certainty.
- On or just before the switch date
- Take meter readings (or confirm smart reads) to help final bills align.
- After the switch
- You get a final statement from your old supplier and start paying the new supplier.
Checks that prevent surprises
- Exit fees: amount and when they apply.
- Tariff type: fixed, variable, or tracker-style (if offered).
- Standing charge: can make a big difference, especially for low usage.
- Payment method: some tariffs are Direct Debit only.
- Economy 7/two-rate: ensure your day/night split is reflected in estimates.
- Prepay: tariff availability may be narrower than credit meters.
If you’re in rented accommodation: you can usually switch supplier if you pay the bills, but check your tenancy agreement. If energy is included in rent or you’re on a landlord contract, switching may not be possible.
Fixed vs variable: which is the better switch deal for you?
There’s no single best tariff for everyone. The right choice depends on how long you plan to stay, your risk tolerance, and whether current fixed rates are above or below the variable options available in your region.
| Option | Pros | Cons | Usually suits |
|---|---|---|---|
| Fixed tariff | Price certainty for the unit rate/standing charge for the term; easier budgeting. | May include exit fees; you won’t benefit if variable prices fall. | Households who value stability, or who want to lock in a rate for a planned period. |
| Standard variable (SVT) | No fixed term; usually no exit fees; may fall if the price cap reduces. | Prices can change; budgeting less predictable. | People expecting to move soon, or who want flexibility. |
| Tracker-style (if offered) | Can go up or down with a published reference; transparent pricing rules. | Not widely available; can rise quickly; may still have fees/terms to check. | Confident budgeters who can tolerate variability and understand the tracking mechanism. |
Decision checklist (quick)
- My fix ends within ~7 weeks and I can switch without an exit fee (or the fee is acceptable).
- I know my meter type (single rate, Economy 7, prepay) and I’m comparing like-for-like.
- I’ve checked standing charges, not just the headline unit rate.
- I understand the term (e.g., 12/18/24 months) and whether I’m likely to move.
- I’m comfortable with the risk: fixed = certainty; variable/tracker = more change.
Who switching now often suits (and who it doesn’t)
Often suits:
- Your fix ends soon and you want to avoid drifting onto an SVT by default.
- You’ve had a change in circumstances (moving from prepay, new baby, home working) and usage may rise.
- You prefer predictable monthly payments.
May not suit:
- You’re likely to move very soon and would rather avoid any exit fee risk.
- Your current fix has a high early exit fee and your end date is still far away.
- You have complex meter arrangements and want advice before changing tariff type.
Two realistic scenarios (with estimated numbers)
The examples below show how standing charges and unit rates can change outcomes. They are illustrative only and not a prediction of future prices.
Scenario A: single-rate dual fuel, Direct Debit
Assumptions: Great Britain region varies; example uses single-rate electricity and gas, monthly Direct Debit. Annual usage: Electricity 2,900 kWh, Gas 12,000 kWh. Standing charges: Elec 55p/day, Gas 30p/day.
| Tariff | Unit rates used | Estimated annual cost |
|---|---|---|
| Variable (example) | Elec 24p/kWh, Gas 6p/kWh | ~£1,573 |
| 12m Fixed (example) | Elec 26p/kWh, Gas 6.5p/kWh | ~£1,682 |
In this illustrative case, the fixed option costs more at today’s assumed rates, but offers stability if prices rise. Your local rates and standing charges may differ.
Scenario B: electricity-only flat, low usage
Assumptions: Electricity only. Annual usage: 1,600 kWh. Standing charge: 60p/day. Comparing two tariffs with different standing charges and unit rates.
| Tariff | Standing charge | Unit rate | Estimated annual cost |
|---|---|---|---|
| Option 1 (example) | 60p/day | 24p/kWh | ~£734 |
| Option 2 (example) | 45p/day | 27p/kWh | ~£636 |
For low usage, a lower standing charge can outweigh a slightly higher unit rate. This is why comparing full estimated annual cost matters.
Important: These scenarios use simplified example rates. Real quotes depend on your region, meter type (including Economy 7 splits), VAT rules and supplier terms.
Costs, exclusions and common pitfalls (UK-specific)
Most switching problems come from mismatched assumptions (meter type, payment method, end dates) rather than the switching process itself. Here are the issues to watch.
1) Exit fees and timing
Some fixed tariffs charge an exit fee if you leave before the end date. Check:
- the fee amount (often per fuel)
- whether it applies in the final weeks of your contract
- what happens if you’re moving home
2) Standing charges can dominate
For lower usage households, standing charges may make up a large share of the bill. Always compare estimated annual cost for your usage, not just the unit rate headline.
3) Economy 7 / two-rate estimates
If you have Economy 7, your day/night split matters. If you don’t know it, your estimate may be off. Consider checking recent bills to see your day and night kWh usage.
4) Prepayment availability and debt
Prepay tariffs can be more limited, and supplier policies can differ if there’s debt attached to the meter. If you’re in this situation, it may be worth getting advice before switching.
5) Price cap misunderstanding
Ofgem’s price cap is not a cap on your total bill. It limits the maximum unit rate and standing charge for typical tariffs, and your total cost still depends on usage.
6) Moving home
If you’re moving soon, focus on flexibility and admin simplicity. A long fixed deal may not be ideal if it includes exit fees or can’t move with you.
If you’re in debt to your current supplier: switching may still be possible, but rules and supplier policies vary. Consider contacting your supplier and getting independent advice from Citizens Advice.
FAQs
When should I switch if my fixed tariff is ending?
Many people start comparing around 4–7 weeks before the end date. Check whether your tariff has an exit fee and if it’s waived in the final 49 days. If you’re unsure, ask your supplier to confirm in writing.
Will my energy be cut off if I switch?
No. Switching supplier doesn’t interrupt supply. It’s an account and billing change managed between suppliers and the network.
Do I need my MPAN/MPRN to switch?
Not always. Postcode and address are often enough to start a comparison, but having your MPAN (electricity) and MPRN (gas) can help if there’s any address confusion, especially in flats.
What if I have a smart meter?
You can still switch. In some cases, smart features may temporarily operate in “dumb” mode, but the meter continues to measure usage. Always confirm any tariff requirements (for example, smart-only tariffs).
Can I switch if I’m on prepayment?
Often yes, but the range of tariffs can be smaller than for credit meters. If you have debt linked to the meter, switching may be more complex. Consider getting support from Citizens Advice if you’re unsure.
Are fixed tariffs always cheaper than variable?
No. A fixed tariff can be higher or lower than variable depending on current market pricing and your region. Fixed is mainly about certainty; variable may be better if rates fall, but can rise too.
What if I’m moving house soon?
If you’re moving, you can usually either take your supplier with you (if they serve the new address) or switch. Be cautious with fixed deals that have exit fees if there’s a chance you’ll need to end the contract early.
How do I avoid estimated bills during a switch?
Take meter readings on the day your supply transfers (or confirm smart readings are up to date). Keep a photo of your meter display as a record, especially if there’s any later billing query.
Trust, methodology and sources
Page details
- Written by: EnergyPlus Editorial Team
- Reviewed by: Energy Specialist
- Last updated: March 2026
How we assess “switch deals” when fixed tariffs are ending
We focus on what typically changes your real-world costs and experience during a switch. Rather than relying on a single “average bill” figure, we emphasise comparisons built from:
- Region (postcode): standing charges and unit rates vary across Great Britain regions.
- Meter type: single-rate vs Economy 7/two-rate vs prepayment.
- Payment method: monthly Direct Debit vs pay on receipt (availability and prices can differ).
- All-in estimated cost: unit rates plus standing charges, based on stated kWh assumptions.
- Terms that affect outcomes: exit fees, contract length, and eligibility criteria.
Limitations: Energy tariffs change frequently and availability can be restricted. Any examples on this page are illustrative only and may not match live market pricing in your area. Always check the tariff information before switching.
Ready to switch before your fixed deal ends?
Compare options for your postcode, meter type and payment method. You’ll see estimated costs and key terms before you decide.
Reminder: switching doesn’t affect your physical supply. If you’re in the middle of a complaint or billing dispute, consider resolving it first or keep records (meter photos, bills and dates).
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