Best Cash ISA Rates April 2026: Easy Access & Fixed AERs

Five of the eight easy-access ISAs in MSE's current best-buy table have a 12-month introductory bonus. That is not a coincidence — it is how challenger banks game comparison sites without committing to the rate.

Trading 212 — 4.51% AER (3.60% base + 0.91% bonus). The market leader for new money. After 12 months the bonus drops and you earn 3.60%, which is below base rate. Set a calendar reminder for April 2027. Money sits in a ring-fenced client account at Barclays, NatWest or JPMorgan with FSCS protection of £120,000 per banking group on cash deposits.

Plum — 4.31% AER (2.54% base + 1.77% bonus). The transfer-in rate stays competitive once existing-balance customers are factored in, which matters if you are consolidating old ISAs paying 2%. App-only, no phone support, FSCS protection via Investec.

Vida Savings — 4.16% AER with no bonus, but limited withdrawals (effectively a soft notice account). A clean rate if you can plan around the withdrawal cap.

Virgin Money — 4.15% AER variable, no bonus. The best big-name option for savers who want a household bank and a stable rate. Now part of Nationwide — check your combined exposure across both brands stays under £120,000 if you are close to the FSCS limit.

Tesco Bank — 4.06% AER (1.05% base + 3.01% bonus). The most aggressive bonus in the table. Year two on 1.05% would be brutal — only worth taking if you will switch on the dot.

Tembo — 4.06% AER and Leeds BS — 4.05% AER are the picks for hands-off savers. No bonus, no expiry, no diary entry required.

The second bar is the one that matters for hands-off money. Tembo and Leeds Building Society at 4.05–4.06% out-earn Trading 212 from month 13 onwards. For ISA balances you intend to leave in place, the no-bonus options are mathematically superior unless you genuinely will switch every year — and most people, in practice, do not.

For a deeper look at how cash ISAs fit alongside other ISA types, see our comprehensive ISA guide.

Eight months ago a 5-year fix paid roughly 0.4% more than a 1-year fix. Six weeks ago the yield curve had flattened to nothing: Close Brothers paid 4.53% for both 3 years and 5 years, Investec paid 4.52% for 1 year. The premium for committing your money for an extra four years was essentially zero.

That fixed-rate-ISA shop window is now badly out of date — and providers are slow to reprice. UK 10-year gilt yields hit an 18-year high of 5.1% on 5 May 2026, and the 30-year hit 5.78%. The wholesale market is paying significantly more than retail fixed-rate ISAs do. Watch for new-issue rates above 4.7–4.8% in the next few weeks; if you can wait, wait.

1-year fixed: Investec 4.52%, OakNorth Bank 4.50%, Santander 4.50%. Investec is the highest pure-rate pick. Santander matters if you want a household name without leaving the high street.

2-year fixed: Secure Trust Bank 4.52%, Hodge Bank 4.51%, Santander 4.50%. Two years gets you through the next four MPC meetings. Six weeks ago that meant riding through near-certain cuts; today it means optionality if the Iran-war inflation impulse forces the BoE to hold for longer.

3-year fixed: Close Brothers 4.53%, Aldermore 4.51%. The standout deal at the time it was launched. The same providers' current gilt curve implies they could be offering closer to 4.8–5.0% if they repriced today — they have not yet.

5-year fixed: Close Brothers 4.53%, Nationwide 4.50%. Locking 4.53% through to spring 2031 looked remarkable in March. With 10-year gilts at 5.1%, it now looks like the kind of rate you take only if you genuinely need ISA-wrapped certainty rather than the highest absolute return.

The pick for most savers is still the 2-year fix — it rides through the next four MPC meetings, gives you optionality if rates climb further, and is short enough that you are not committing through the 2027/28 ISA-cap regime change without an exit. But anyone who can cope with marking-to-market should at least price the alternative — see the gilt comparison in the next section.

For the slice of your savings that cannot fit in the 2026/27 ISA allowance — anything above £20,000 — the question changes from "which cash ISA?" to "which wrapper?" And in May 2026 the answer has shifted.

UK gilts now pay measurably more than the best fixed-rate ISAs. The 10-year gilt yields 5.1% and the 30-year 5.78% — gross redemption yields, not coupon rates. That gap of 50–100 basis points over the best ISA fix is not noise; it is the bond market pricing in a sticky-inflation Iran-war scenario that retail providers have not yet repriced into their savings books.

There is also a tax wrinkle most savers miss. Gilt coupons are taxed as savings income, just like cash interest. But gilt capital gains are exempt from CGT — a quirk written into UK tax law specifically for government bonds. That makes low-coupon gilts trading at a discount to par particularly efficient for higher-rate taxpayers: you take a small taxable coupon plus a chunky tax-free pull-to-par. Our practical guide to buying UK gilts walks through the platforms (HL, AJ Bell, Interactive Investor, iWeb) and which low-coupon issues are currently in the sweet spot.

When does this make a cash ISA worse than a gilt-in-GIA? Three conditions need to hold:

• You are a higher-rate or additional-rate taxpayer with savings already above £20,000
• You can hold to maturity (gilts will move against you mid-life if yields rise further)
• You have already used your 2026/27 ISA allowance, so the marginal pound is in a taxed account either way

If all three are true, a low-coupon 5-year gilt yielding 5.0%+ to maturity probably beats a 4.53% fixed-rate ISA after tax — and meaningfully beats it from 2027/28 once the savings higher rate climbs to 42%. For the full mechanics including how rate moves can hurt you, read our gilt yields explained guide.

The cash ISA wrapper is still the right answer for the first £20,000 — the tax-free certainty you cannot replicate elsewhere. It stops being the right answer at £20,001.

"Best" is a useless word without context. Here is what it means by saver type, with the actual top pick for each:

The Switcher (will move providers every 12 months). Best pick: Trading 212 at 4.51%. Bonus expires April 2027 — diary entry mandatory. Year-one return on the full £20,000 allowance: £902.

The Set-and-Forget Saver (will not switch). Best pick: Tembo at 4.06% or Leeds BS at 4.05%. No bonus to expire, no calendar maintenance. Year-one return on £20,000: £812. Second year you keep earning roughly the same versus the Trading 212 saver dropping to £720.

The Rate-Locker (wants to lock in current yields). Best pick depends on tax position. For an ISA-wrapped lock, Close Brothers 3-year fixed at 4.53% is the table-topper — paid more for a longer commitment than the 1-year fix, with year-one return on £20,000 of £906 repeated every year through 2029. For non-ISA money above the allowance, see the gilt route in the section above.

The Higher-Rate Taxpayer (£500 PSA, future 42% savings tax rate). Best pick: whichever ISA pays most that you will actually use. The wrapper is doing the work, not the rate. A 4.05% ISA beats a 4.50% taxable account at the higher rate from 2027/28 — see the worked example below.

Select the wrong category and you cost yourself real money. A higher-rate taxpayer chasing 0.46% of extra headline rate by jumping into a Trading 212 bonus they will not switch out of would be £230 worse off across two years than someone who just opened Tembo and walked away.

For the comparison framework on cash versus other savings options, see the £50,000 framework.

All three scenarios assume the full 2026/27 allowance deposited on 6 April 2026 and held to 5 April 2031. Returns shown are simple interest compounded annually — actual figures will vary by daily/monthly interest rules and any switching gaps.

Scenario A — Trading 212 4.51% with annual switching. Year one earns 4.51%. Year two onward assumes you successfully switch each April to whatever leads the easy-access table (held flat at 4.10% as a conservative central estimate). Five-year balance: roughly £24,506. Total interest: £4,506.

Scenario B — Trading 212 4.51% but you forget to switch. Year one earns 4.51%, then years two through five earn the post-bonus rate of 3.60%. Five-year balance: £24,094. Total interest: £4,094. Forgetting once costs you £412.

Scenario C — Tembo 4.06% no bonus, no switching. Earns 4.06% throughout. Five-year balance: £24,407. Total interest: £4,407. Within £100 of the active-switcher path, with zero admin.

The lesson: the active-switching premium is small (~£140 over 5 years versus Tembo) and it is fragile — one missed switch and you have wiped it out twice over. Pick the strategy you will actually execute.

For higher-rate taxpayers, the comparison gets sharper from 2027/28 once the savings basic rate climbs to 22% and the higher rate to 42%. £20,000 at 4.05% in a Tembo ISA earns £810 tax-free. The same money in a 4.50% taxable account earns £900 gross, but the £500 PSA covers only the first slice — the remaining £400 is taxed at 42%, removing £168. Net: £732. The lower-rate ISA wins by £78 in year one and the gap widens annually through compounding.

Two policy changes make this tax year uniquely valuable, and one new macro variable raises the stakes.

First, the HMRC technical note confirms that from 6 April 2027 the cash ISA allowance for under-65s drops from £20,000 to £12,000. The overall ISA limit stays at £20,000, but only £12,000 can go into cash. The remaining £8,000 must go into stocks and shares or innovative finance — or sit unused. Transfers from S&S ISAs back into cash will also be banned. The door closes one way.

Second, the same note raises the savings basic rate from 20% to 22% and the higher rate from 40% to 42% from 2027/28. The Personal Savings Allowance stays at £1,000 for basic-rate and £500 for higher-rate taxpayers. Once you exceed it, you lose 22p or 42p in every pound.

Third — and this is new since the article was last updated in March — the Iran war's effect on UK long-term yields means inflation expectations have re-anchored higher. CPI is at 3.3% today; if oil supply disruption persists, sticky inflation eats real returns on cash. A 4.05% ISA in a 4–5% inflation environment delivers a negative real return after tax in a non-ISA account, and a marginally positive one in an ISA. The structural case for using the wrapper got stronger, but so did the case for moving the wrapper-protected money into something that earns more than 4%.

The combined effect: every £8,000 contributed to a cash ISA in 2026/27 is permanently sheltered from the 2027 cap, and every pound of interest it ever generates escapes the 22% / 42% regime. Compounding makes this worth far more than the headline £8,000 figure suggests. £8,000 left at 4% for 30 years grows to about £25,950 — all of it tax-free in the ISA, of which roughly £14,500 would otherwise be taxed at 42% in a non-ISA wrapper, costing £6,090.

This is the optimiser case, plainly stated: use every pound of the 2026/27 cash ISA allowance you can spare. The future cost of skipping this year is not the £902 of year-one interest — it is the lifetime stream of tax-free compounding on the £8,000 you can never put back in.

For the broader 2026/27 allowance picture, see our £67,700 of tax-free allowances checklist.

Open one this week if any of these are true.

• You have savings above £20,000 (basic-rate) or £11,000 (higher-rate) — your PSA is already exhausted, so every pound of interest above that is taxed today, not in 2027.
• You are a higher-rate or additional-rate taxpayer with any meaningful savings — the £500 PSA runs out at about £11,000 in a 4.5% account.
• You expect your savings to grow over the next decade — the 2026/27 allowance is your last chance to lock in £20,000 of cash ISA space; from April 2027 it is £12,000.
• You hold old ISAs paying below 4% — formally transfer them into a current best-buy. Transfers do not count against the annual allowance.

Wait or skip if these are true.

• Total savings are under £15,000 and you are basic-rate — your PSA covers you in 2026/27 and the wrapper adds nothing today. But: revisit in spring 2027 when the rate jumps to 22%.
• You are deciding between cash ISA and S&S ISA for long-term money — for horizons over 10 years, equities have historically outperformed cash by enough that the opportunity cost matters more than the tax shield. A cash ISA is the right wrapper for short-term cash, not for retirement money.
• You have already used 2026/27 ISA allowance and have more to invest at higher-rate tax — price up direct gilts before defaulting to a 4.5% taxable savings account. The 10-year at 5.1% plus tax-free capital gain on a low-coupon issue can beat the after-tax ISA-fix return.
• You need the money within 6 months — flexible ISAs allow withdrawal-and-replace within the same tax year (Trading 212, Chip and several others are flexible), but for very short-term cash a current account is simpler.

For the cash-versus-equity comparison in detail, see our cash ISA vs S&S ISA debate which lays out both sides.

This article is for informational purposes only and does not constitute financial advice. You should seek independent financial advice before making any investment decisions.