Cash ISA Guide: Best Cash ISA Rates UK 2026/27 — Easy Access, Fixed and How to Choose the Right Account

Easy-access cash ISAs let you withdraw without penalty, making them suited to emergency funds or savings you might need at short notice. Rates are variable — providers can cut them at any time — but the current spreads are unusually generous.

The market leader is Trading 212 at 4.51% AER, followed by Chip at 4.42% AER (which accepts transfers in at the same rate — a rarity among top payers). Moneybox pays 4.39% but that includes a 0.94% twelve-month bonus that will drop off, so savers need to be ready to switch when it does. Plum sits at 4.38%, also bonus-loaded with a 1.84% introductory uplift.

For savers who dislike bonus games, Charter Savings Bank pays 4.09% AER with no introductory bonus and unlimited withdrawals. Tesco Bank offers 3.97% (including a temporary bonus), while Bank of Ireland UK pays 3.95%. Neither is a market leader, but both are established high-street names where some savers prefer to keep their money.

*Rates marked with an asterisk include a temporary introductory bonus that expires after 12 months.

One critical detail: check whether the ISA is 'flexible'. A flexible ISA lets you withdraw and replace money within the same tax year without it counting against your £20,000 allowance. Trading 212 and Charter Savings Bank are not flexible ISAs. If you might need to dip into savings temporarily, flexibility matters more than a tenth of a percentage point on the rate.

For help moving existing ISA money to a better rate, see our guide on how to transfer a cash ISA without losing your tax-free status.

Fixed-rate cash ISAs guarantee your interest for a set period, shielding you from further base rate cuts. With the Bank of England holding at 3.75% since December 2025 — and the June 2026 MPC voting to hold again, citing energy price risks — the question is not whether rates will eventually fall, but when.

For a one-year fix, Investec leads at 4.68% AER, followed by Close Brothers at 4.08% (minimum £10,000 deposit) and Castle Trust Bank at 4.06% (£1,000 minimum). Zopa offers 4.05% for one year. For two years, Hodge Bank tops the table at 4.71% AER, with Furness Building Society at 4.07% and Cynergy Bank at 4.05%. Five-year fixes are led by Castle Trust Bank at 4.25% — notably lower than the shorter-duration options, reflecting market expectations that rates will decline.

The unusual feature of today's market is that a one-year fix at 4.68% and a two-year fix at 4.71% both beat every easy-access rate. Normally you sacrifice yield for access — right now you get paid more to lock in. A saver with £20,000 in Investec's one-year fix at 4.68% earns £936 in tax-free interest over twelve months. The same sum in Trading 212's easy-access 4.51% earns £902 — a £34 difference that buys you nothing if you would not have touched the money anyway.

Fixed ISAs carry early access penalties, typically 60 to 365 days' worth of interest. All providers must allow you to access your money, but some require full account closure. Read the penalty terms before committing — especially on longer fixes. For the wider savings context, see our guide to fixed-rate savings bonds.

On 23 June 2026, HMRC confirmed that from a future date it will apply a 22% tax on cash interest earned inside stocks and shares ISAs. Until now, any cash sitting uninvested in an S&S ISA earned interest tax-free — a loophole that let investors park money inside their equity wrapper while earning cash-like returns without using their cash ISA allowance.

That loophole is closing. The precise implementation date is still to be confirmed, but the direction is clear: cash belongs in a cash ISA, equities belong in an S&S ISA, and mixing the two will cost you.

For investors who currently hold significant cash balances inside S&S ISAs — perhaps waiting for a market dip, or sitting on a recent deposit — the maths has shifted. A 22% tax on, say, 4.51% interest reduces the effective return to 3.52%. That same money inside a cash ISA earns the full 4.51% tax-free. On a £10,000 cash balance, the difference is £99 per year. On £50,000, it is £495.

This change does not affect money actually invested in funds or shares within an S&S ISA — only uninvested cash balances earning interest. But it removes what was, for cautious investors, a convenient middle ground. The takeaway is simple: if you have cash you want to keep as cash, open a dedicated cash ISA. The tax advantage of the wrapper is now exclusive to the product designed for it.

More broadly, the reform signals that HMRC is tightening ISA rules. The cash ISA allowance cut from £20,000 to £12,000 for under-65s from April 2027 is part of the same trajectory. Both changes push savers toward either spending their money or investing it — and away from accumulating large tax-sheltered cash balances. Using this year's full £20,000 allowance while it still exists is the rational response.

Whether you need a cash ISA depends on your tax position. Every UK taxpayer gets a personal savings allowance (PSA): £1,000 for basic-rate (20%) taxpayers and £500 for higher-rate (40%) taxpayers. Additional-rate (45%) taxpayers get no PSA at all, as detailed in HMRC's current rates and allowances.

At today's leading easy-access savings rates of around 4.5%, a basic-rate taxpayer needs approximately £22,000 in non-ISA savings before they start paying tax on interest — just above the £20,000 ISA limit. So for many basic-rate taxpayers, the immediate tax benefit of a cash ISA is marginal if they have less than £20,000 in total savings. However, the long-term compounding advantage is real: ISA savings remain permanently tax-free, and with rates at these levels, the shelter builds genuine value over multiple tax years.

For higher-rate taxpayers, the maths is brutal. With a £500 PSA, you start paying 40% tax on savings interest once your non-ISA savings exceed roughly £11,000 at today's rates. A higher-rate taxpayer with £30,000 in regular savings at 4.5% would lose approximately £360 per year to HMRC — money that would be entirely sheltered inside a cash ISA. Additional-rate taxpayers lose 45% on every penny of interest from the first pound.

The PSA thresholds have not been increased since their introduction in 2016, despite interest rates rising from near-zero to over 4%. A £500 PSA was designed for a world where the best savings account paid 1.5% — not 4.5%. The result is that far more savers now pay tax on interest than the policy ever intended. A cash ISA is the only way to opt out.

The approaching allowance cut from £20,000 to £12,000 for under-65s from April 2027 reinforces the case for acting this tax year. Money sheltered inside an ISA before the cut retains its tax-free status permanently, regardless of future allowance changes. For more on the wider ISA landscape, see our complete ISA hub.

The choice between easy-access and fixed-rate cash ISAs turns on three factors: your need for liquidity, your view on the rate cycle, and how long you can lock money away.

Right now, the market is offering an unusual configuration. One-year fixed rates (Investec 4.68%) and two-year fixes (Hodge Bank 4.71%) both exceed the best easy-access rate (Trading 212 4.51%). Normally you accept a lower rate for the flexibility of easy access — today you are actually paid more to commit. The yield curve is telling you something: banks expect the base rate to fall, and they are willing to pay above the current cash rate to lock in deposits at what they believe are peak rates.

If you think the Bank of England will cut rates within the next twelve months — and with CPI at 2.8% and a leadership transition underway following the Prime Minister's resignation, the pressure to ease will likely grow — then fixing now at 4.68% or 4.71% protects you from declining returns. A two-year fix at 4.71% could look exceptionally shrewd if the base rate falls to 3.25% or below in 2027.

If you need access to your money, stick with easy access. A 4.51% return with full liquidity is still a genuine real return above 2.8% inflation.

A sensible strategy for many savers is to split the allowance: keep part in easy access for emergencies, and lock the rest into a one- or two-year fix for rate certainty. Since April 2024, you can open multiple cash ISAs in the same tax year — even of the same type — so there is no administrative barrier to splitting across providers. Just remember the £20,000 total annual limit applies across all ISA types combined.

If you are weighing up taxable alternatives, our best savings accounts guide compares easy access, fixed rate bonds and regular savers, including how the PSA affects each.

One of the most valuable — and most misunderstood — features of cash ISAs is the ability to transfer between providers. If your existing ISA pays a poor legacy rate, you can move it to a better-paying account without losing the tax-free wrapper. Crucially, transfers of previous years' ISA savings do not count towards your current year's £20,000 allowance.

The golden rule is simple: never withdraw money from a cash ISA to transfer it. If you withdraw, the money loses its ISA status permanently and cannot be replaced (unless your ISA is flexible and you replace within the same tax year). Instead, contact your new provider and complete an ISA transfer form. They handle the process, which should complete within 15 working days under the industry's agreed service standard.

Most top-paying providers accept transfers in, though some pay a lower rate on transferred balances. Chip pays the full 4.42% on both new money and transfers in — one reason it is our recommended transfer destination. Trading 212 pays 4.51% on new deposits but typically does not prioritise transfers. Charter Savings Bank at 4.09% pays the same rate on both, making it a reliable consolidator for savers who prefer a bonus-free rate.

Under the Financial Services Compensation Scheme, regulated by the FCA, deposits with authorised institutions are protected up to £120,000 per person per banking licence (raised from £85,000 in December 2025). For savers with large ISA balances — particularly those who have built up substantial pots over many tax years — spreading savings across multiple institutions remains prudent for amounts above the protection limit.

For a full walkthrough, see our step-by-step cash ISA transfer guide.