Should I fix my ISA, or stay easy access?

Fixed or easy access ISA: what’s the trade-off?

A Cash ISA comes in two basic shapes. An easy access ISA lets you pay in and take out money whenever you like, and pays a variable rate that the provider can change at any time, up or down. A fixed rate ISA pays a rate that is guaranteed for a set term, commonly 1, 2, 3 or 5 years, in exchange for locking your money away for that term.

Neither is right or wrong. The trade-off is certainty against access. Fixing removes the risk that your rate falls during the term, but it also removes your ability to move the money if a better deal appears, or if you simply need it. Staying easy access keeps your options open, but your rate can fall as well as rise, and a provider can cut it with little warning.

The only way to make this decision with anything better than a guess is to look at the actual gap between what a fix pays today and what easy access pays today, then weigh that gap against how likely you are to need the money before the term ends. If you would rather avoid locking money away at all, see how Premium Bonds compare with a Cash ISA as a fully flexible alternative.

Easy access ISA or fixed rate: how much more does fixing pay?

Right now, the top easy access Cash ISA in our table pays 4.50% AER (Chip, checked 29 September 2026). Over 1, 2 and 3 years, the top fixed rate ISAs pay 4.88% AER (Hodge Bank, checked 29 September 2026), 5.00% AER (Close Brothers Savings, checked 29 September 2026) and 4.97% AER (Kent Reliance, checked 29 September 2026) respectively, with 5 year fixes at 5.25% AER (Shawbrook Bank, checked 29 September 2026).

To see whether fixing is worth it for you, compare those figures directly rather than relying on a rule of thumb. As an example only, not a prediction: if easy access paid 4% AER and a 1 year fix paid 4.5% AER, then £10,000 would earn about £400 over the year in easy access, assuming the rate never moved, against £450 guaranteed in the fix, a difference of £50. Multiply the gap you actually see in our tables by your own balance to get a sense of what fixing is worth to you in cash terms, or use our Cash ISA interest calculator to do the sums for your own numbers.

Some easy access ISAs also pay an introductory bonus rate for a set period, often the first 12 months, before dropping to a lower standard rate. Check the ongoing rate as well as the headline one when you compare, since a fixed rate stays the same for the whole term while a bonus does not.

Should I fix my ISA for 1 or 2 years, or longer?

Longer fixes tend to pay more, but the certainty cuts both ways. A 1 year fix only commits you for a year, so if a better deal turns up in month 8, you are not far from being able to take it. A 5 year fix can lock in today’s rate for a long time, which is valuable if rates fall, but costly if they rise and you are stuck earning less than the market rate with years still to run.

One way to manage that uncertainty without guessing is to split your savings across more than one term, an approach often called laddering. Rather than putting everything into a single 3 year fix, you might split it across a 1 year fix and a 3 year fix, so that part of your money is free to move or re-fix sooner, while the rest locks in a longer-term rate. Compare the 1, 2, 3 and 5 year rates in our fixed rate ISA table to see how much extra a longer commitment is paying at the moment.

There is no way to know in advance whether a longer fix will turn out to be the right call. It depends on what happens to rates over the years you have locked in, which this site does not predict.

What happens if I need my money before a fixed ISA matures?

This is the real cost of fixing, and it is worth understanding before you commit, because providers vary widely.

Some charge a penalty calculated as a set number of days’ interest on the amount you withdraw early, so the longer the term, the bigger the penalty tends to be. Hodge Bank’s fixed rate Cash ISAs, for example, currently charge an early access fee equivalent to the following, correct when our data was last checked on 29 September 2026:

Term	Early access charge
1 year	90 days’ interest
2 years	180 days’ interest
3 years	270 days’ interest
5 years	365 days’ interest

As an example of the arithmetic, not a live rate: on a £10,000 balance in a 2 year fix paying an assumed 5% AER, a 180 day charge works out to about £10,000 multiplied by 5%, then by 180 divided by 365, which comes to roughly £247 lost if you break the term early.

Other providers go further and simply do not allow any access at all once the term has started, only letting you close the account at maturity. “Fixed” does not always mean the same level of restriction from one provider to the next, so always check a specific product’s withdrawal terms before you commit rather than assuming.

Will Cash ISA rates drop, or should I fix my ISA now?

We do not predict where rates are heading, and you should treat anyone who claims to know with some scepticism.

What we can tell you is where things stand today. The Bank of England’s Monetary Policy Committee held Bank Rate at 3.75% at its meeting on 17 September 2026, and the next scheduled decision is due on 5 November 2026. Easy access ISA rates are variable, and providers often move them in line with actual and expected changes to Bank Rate, though they are not obliged to track it exactly or immediately. A fixed rate ISA, by contrast, pays the rate you locked in on the day you opened it for the whole term, regardless of what the Bank of England decides at any meeting in between. The higher tax rates on savings interest due from April 2027 are covered in our piece on the 2027 savings tax changes, which is a separate change from anything Bank Rate does.

That is really the whole decision in one sentence: fixing trades away the chance of benefiting from a future rate rise in return for protection against a future rate fall. Which of those you would rather have is a personal judgement, not something this page can make for you.

How do I move into a fixed rate ISA without losing my allowance?

If you already hold cash in an ISA and want to move it into a fixed rate deal, use an ISA transfer rather than withdrawing the money and paying it into the new account yourself. Withdrawing it yourself and paying it back in counts as a brand new subscription, which can use up your allowance a second time, or simply not be allowed if you have already used this year’s allowance elsewhere.

Instead, apply to the new provider and ask them to handle the transfer directly with your old one, using an ISA transfer form. gov.uk says transfers between Cash ISAs should complete within 15 working days, and other types of ISA transfer within 30 calendar days. This applies whether the money you are moving was subscribed this year or in an earlier tax year. See our ISA transfer guide for the full process.

What does the April 2027 Cash ISA limit mean if I fix now?

From 6 April 2027, anyone who is 64 or under at the end of the relevant tax year can subscribe at most £12,000 a year into Cash ISAs, down from £20,000. Savers who are 65 or over keep the full £20,000 cash limit. gov.uk’s factsheet describes the £12,000 figure as a reduction to the Cash ISA “subscription limit”, wording that applies to new money paid in during a tax year rather than to what you already hold. On that basis, a fixed rate ISA you open now, and the balance already in it, is not affected by the 2027 change. See our full guide to the 2027 Cash ISA limit for the wider change.

What is genuinely unclear is how a fixed ISA that matures after 6 April 2027 will be treated if you want to reinvest into a new fix at that point. Neither the Cash ISA limit factsheet nor HMRC’s tax-free savings newsletter 22 addresses fixed-term products directly, and the technical consultation on the draft legislation had not concluded as of this check. HMRC says the final regulations are due to be laid in autumn 2026, and the next Budget is on 28 October 2026.