High interest savings accounts and Cash ISAs in the UK: how to choose (October 2026)

The right account depends on one question: when might you need the money? If you might need it any day, an easy access account or easy access Cash ISA is the right home. If you can leave it alone for 30 to 120 days, a notice account usually pays a little more. If you can lock it away for one to five years, a fixed-rate bond or fixed-rate Cash ISA guarantees your rate.

To find the top rate today, check an independent best-buy table such as MoneySavingExpert, Moneyfacts or Which?, filter by the type of account you need, then confirm the rate, the conditions and FSCS protection on the provider's own website before you apply. Rates change daily, which is why this guide does not list a best-buy table of its own. Instead it shows you how to read those tables and avoid the catches.

UK savings accounts trade flexibility for rate. Less access usually, though not always, means a higher rate.

With regular savers, you pay in monthly, so your average balance is only about half the final total and the interest in pounds is lower than the headline rate suggests. Our regular saver guide explains the maths. For a deeper look at access trade-offs see easy access vs notice accounts, and for locking money away see fixed-rate savings bonds explained.

Premium Bonds pay no interest. Instead, each £1 bond goes into a monthly prize draw, and NS&I publishes a prize fund rate that changes from time to time. Your actual returns can differ a lot from it: Premium Bonds vs easy access savings.

A Lifetime ISA lets people aged 18 to 39 open an account and pay in up to £4,000 a year (counted inside the overall ISA allowance), with a 25% government bonus. Withdrawals before 60, other than for a first home, usually carry a penalty, so it is not for an emergency fund. See Lifetime ISA explained.

AER stands for Annual Equivalent Rate. It shows what you would earn over a year if interest were added and left to compound, so you can compare accounts that pay interest at different frequencies on a like-for-like basis. Always compare AERs, not gross rates.

Gross rate is the contractual rate before tax, ignoring how often interest is paid. AER builds in the effect of compounding. If an account pays interest once a year, the gross rate and AER are the same. If it pays monthly, the AER is a little higher than the gross rate.

Worked example: you save £10,000 in an account paying 4.00% gross, with interest paid monthly and left in the account. Each month you earn 4.00% divided by 12, about 0.333%, and the next month's interest is calculated on the slightly larger balance. After 12 months you have about £10,407, so the AER is about 4.07%. Try your own numbers in the compound interest calculator.

Monthly or annual interest? Where you can choose, the monthly option usually has a slightly lower gross rate so both have the same AER. Monthly suits you if you want an income; otherwise pick the higher AER.

Introductory bonus rates. Many easy access accounts include a bonus for the first 6 or 12 months. As an illustration, an account advertised at 4.50% AER might be a 3.50% variable rate plus a 1.00% bonus. When the bonus ends, you drop to the underlying rate without the account changing in any other way. Note the end date in your calendar and compare again a few weeks before it.

Most people pay no tax on their savings interest because of three allowances, all confirmed on gov.uk:

• Personal Savings Allowance: up to £1,000 of interest a year tax-free for basic rate taxpayers, £500 for higher rate taxpayers and £0 for additional rate taxpayers.
• Starting rate for savings: up to £5,000 of interest tax-free if your other income (such as wages or pension) is below £17,570. It reduces by £1 for every £1 of other income above your Personal Allowance.
• ISA allowance: interest inside an ISA is always tax-free and does not use your Personal Savings Allowance. In the 2026/27 tax year (6 April 2026 to 5 April 2027) you can put up to £20,000 into ISAs in total, and you can put all £20,000 into Cash ISAs if you wish.

As a rough guide, a basic rate taxpayer earning 4% would use up a £1,000 allowance with around £25,000 in ordinary savings. A higher rate taxpayer reaches the £500 limit at around £12,500. Above that, a Cash ISA becomes clearly better. More detail: Personal Savings Allowance explained.

What changes from April 2027. At the Budget in November 2025 the government announced that from 6 April 2027 the annual limit for Cash ISAs will be £12,000 for savers under 65. The overall ISA allowance stays at £20,000 (and is due to remain at that level until April 2031), so under-65s will still be able to put the other £8,000 into a Stocks and Shares ISA or other ISA types. Savers aged 65 and over will keep a £20,000 Cash ISA limit. Under-65s will also be unable to transfer from Stocks and Shares or Innovative Finance ISAs into Cash ISAs, and interest on cash held in a Stocks and Shares ISA will face a charge. The detailed regulations were still being finalised at the time of writing (October 2026), so check gov.uk before acting on the finer points.

The change does not affect 2026/27: you can still put up to £20,000 into Cash ISAs until 5 April 2027, and money already in Cash ISAs stays tax-free. See the ISA allowance for 2026/27 explained and track what you have used with the ISA allowance calculator. If you are weighing cash against investing for the long term, read Cash ISA vs Stocks and Shares ISA.

The Financial Services Compensation Scheme (FSCS) protects eligible deposits at UK-authorised banks, building societies and credit unions. The limit rose from £85,000 to £120,000 per eligible person, per authorised firm on 1 December 2025. A joint account gives each holder up to £120,000.

The catch is per authorised firm. Some brands share one banking licence, so savings across them share a single £120,000 limit. Before splitting money between two brands, check on the FSCS website that they are separate firms. Cash ISAs count towards the same limit as your other deposits at that firm.

Temporary high balances, such as proceeds from a house sale, an inheritance or a redundancy payment, can be protected up to £1.4 million for six months from when the money arrives, if they meet the FSCS conditions.

NS&I products, including Premium Bonds, are not FSCS-protected because HM Treasury backs 100% of the money you hold with NS&I.

The Bank of England's Bank Rate is 3.75% at the time of writing (October 2026). It was last changed on 18 December 2025, when it was cut from 4.00%, and the Monetary Policy Committee has held it at each meeting since. The next scheduled decision is on 5 November 2026.

Bank Rate is not the rate you earn, but it shapes it. Banks set variable savings rates partly by reference to it. Fixed rates reflect what markets expect rates to do over the term, which is why a fix can sometimes pay less than easy access.

We do not predict rate moves. The practical point is simple: a variable rate can be cut with notice at any time, while a fixed rate is guaranteed for the term. If certainty matters to you, fixing part of your savings removes the guesswork. Compare what different rates mean in pounds with the savings rates calculator.

Shortlist using MoneySavingExpert's top savings tables, Moneyfacts or Which?, starting with the account type that fits your access needs, then read the provider's summary box before applying.

We do not publish a best-buy table because rates change too often to keep one accurate. Instead, judge any account against these criteria, in this order:

A simple setup works for most households. First, an easy access account or easy access Cash ISA holding your emergency fund; the emergency fund calculator will help you work out how much that should be. Second, a regular saver or a pot for each short-term goal, planned with the savings goal calculator. Third, any money you will not need for a year or more in a fixed-rate bond or fixed Cash ISA.

A good rate only helps if money actually goes in. If you find saving consistently hard, SYM is a free savings challenge app for iPhone and Android. It does not connect to your bank or hold your money; it tells you how much to put aside today, and you tap to log it once you have moved it into your savings account.