Fixed vs Variable Energy Tariff in 2026: Which Should You Choose?

Every UK energy customer sits on one of two kinds of tariff: fixed or variable. The choice between them is really a choice about risk. Do you want certainty over your unit rates, or do you want the flexibility to benefit if prices fall? With the Ofgem price cap setting the variable rate at roughly £1,641 a year for a typical home in Q2 2026, and fixed deals competing around that level, getting the decision right can save real money.

This guide explains how each tariff works, the trade-offs, and a clear way to decide.

How a variable tariff works

A variable tariff is usually your supplier's standard default tariff. Its unit rates and standing charges are limited by the Ofgem price cap, which is reset every quarter (January, April, July and October). When the cap goes up, your rates go up; when it falls, your rates fall.

The approximate Q2 2026 capped rates are:

These reset quarterly, so check the current cap before deciding. A variable tariff has no exit fees, so you can leave or switch at any time. The trade-off is that your price is never locked: if wholesale prices spike, your bill follows the cap upward.

How a fixed tariff works

A fixed tariff locks your unit rates and standing charges for a set term, typically 12 to 24 months. Whatever happens to the cap during that term, your rates stay the same. This is the appeal: certainty. You know what you will pay per unit for the duration, which makes budgeting easier and protects you from price rises.

The trade-offs are two. First, if the cap falls below your fixed rate, you are paying more than you would on the variable tariff. Second, many fixes carry exit fees, often £25 to £75 per fuel, if you leave early. So fixing is a commitment.

The core trade-off: certainty vs flexibility

The decision comes down to a simple tension:

• Fixed = certainty. You are protected against price rises and your budget is predictable. You give up the chance to benefit if prices fall, and you may face exit fees.
• Variable = flexibility. You benefit automatically if the cap falls, and you can switch at any time with no penalty. You are exposed to price rises if the cap goes up.

Neither is universally better. The right choice depends on the specific deal on offer and on how much you value predictability.

How to compare a fixed deal against the cap

The headline annual figure is a trap, because it assumes typical usage. To compare properly, look at the per-unit rates:

1. Find the fixed tariff's electricity unit rate, gas unit rate, and both standing charges.
2. Compare each against the current capped rate.
3. Weight the comparison by your own usage. If you use a lot of gas, the gas unit rate matters most. If you use little energy, the standing charges dominate.

Worked example. Suppose a fixed deal offers electricity at 23.5p per kWh and gas at 5.5p per kWh, with similar standing charges to the cap. For a household using 2,700 kWh electricity and 11,500 kWh gas a year:

• Electricity saving: 2,700 x (24.67p - 23.5p) = approximately £32 a year
• Gas saving: 11,500 x (5.74p - 5.5p) = approximately £28 a year
• Total saving versus the current cap: approximately £60 a year

That is the saving only if the cap stays where it is. If the cap falls during the fix, the saving shrinks or reverses. If the cap rises, the fix looks better. The £60 is your buffer against price rises, and the price of giving up any fall.

When fixing makes sense

Fixing tends to make sense when:

• The fixed rates are below the current cap, so you start ahead.
• You value budget certainty, for example on a tight or fixed income.
• You expect prices to rise, or you simply do not want the risk of a rise.
• The exit fees are low or zero, so you keep some flexibility.

When staying variable makes sense

Staying on the variable tariff tends to make sense when:

• Fixed deals are priced above the current cap, offering no clear saving.
• You expect the cap to fall and want to benefit automatically.
• You want the freedom to switch at any time without exit fees.
• You can comfortably absorb a price rise if the cap moves up.

Watch the exit fees

Exit fees are the detail that catches people out. If you fix at a good rate but the cap then falls sharply, you may want to switch to a cheaper deal, only to find a penalty in the way. Before signing any fix, check the exit fee per fuel and decide whether the certainty is worth being locked in. A fix with no exit fees is the most flexible option, letting you leave if a better deal appears.

A simple decision framework

Run through these questions:

1. What are the fixed deal's unit rates and standing charges, compared with the current cap?
2. Given my usage, does the fix save money at today's cap, and by how much?
3. How much do I value certainty over the next 12 to 24 months?
4. What are the exit fees, and could I be stuck if prices fall?
5. What is my honest view on where prices are heading?

If the fix saves money now, certainty matters to you, and exit fees are low, fixing is a sound choice. If the fix offers no saving and you can handle price swings, the variable tariff keeps your options open.

The bottom line

Fixed and variable tariffs are two ways of managing the same risk. Fixed buys certainty at the cost of flexibility; variable keeps flexibility at the cost of certainty. Compare the actual unit rates and standing charges against the current Ofgem cap, weight them by your own usage, and factor in exit fees. The right answer is the one that matches your budget and your appetite for risk, not a headline annual number.

To estimate your annual cost on either tariff and compare the two, use the energy bill calculator.