The "saving" displayed in the tariff cards on Cheap Energy Club is a calculation of the difference between how much that tariff would cost you over the next year and our best estimate of what you'd pay over the next year if you don't switch (ie, if you go on to your provider's standard Price-Capped tariff).
It's not a perfect calculation as those who don't switch are subject to the aforementioned Price Cap, which changes every three months based on wholesale costs.
To take account of this, we give you some help at the top of the comparison results to guide you on whether your savings are likely to be more or less than those listed, based on predictions of where the Cap is going to go.
The other thing to note is that where Cheap Energy Club cashback is available, we'll include this in your savings figure – though you can use our filters to compare without the cashback factored in. This works fine for year-long deals, but where the tariff is fixed for longer, we calculate what proportion of your cashback should be added to your savings figure for the first year. In other words, £20 cashback on an 18-month fixed deal will add a saving of £13/year. This helps to make your saving comparable across all tariffs.