Trading 212 Cash ISA Review

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Trading 212 earned a Which? interest-rate score of 93% in August 2026 — the highest of any provider in this comparison, and comfortably ahead of Leeds Building Society on 87% and Nationwide on 70%.

It pays around 4.56% AER from £1, with no minimum balance, no withdrawal cap and no bonus that expires. For a saver who simply wants the best rate with the fewest conditions, that is a strong combination and the conditions genuinely are simple.

The consideration is structural rather than financial. Trading 212 is an investment platform that offers a cash ISA, not a bank or building society that also does investments. That difference shapes how your money is held and what the company's attention is actually on.

No bonus, no minimum, no withdrawal cap

Every other provider in this comparison attaches a condition to its best rate. Moneybox requires £500 and penalises the fourth withdrawal at 0.75%. Nationwide's Triple Access cuts to 1.05% on a fourth withdrawal. Lloyds pays 0.75% unless you have £100,000. Leeds requires you to fix.

Trading 212 does none of that. One pound opens it, the rate is not propped up by an expiring bonus, and you can withdraw as often as you want without penalty.

That simplicity is worth real money because it removes the failure mode that catches most savers — the forgotten bonus expiry, the accidental fourth withdrawal, the balance that dipped below a threshold. If you want an account you can genuinely ignore, this is the one here that tolerates being ignored.

An investment platform is not a bank

This is the part to understand properly before depositing.

Trading 212's core business is share and ETF dealing. The cash ISA is an adjacent product. That has practical consequences: cash held on investment platforms is typically placed with partner banks rather than held by the platform itself, which affects how FSCS protection applies and which institution is actually holding your money.

The Ombudsman data reflects the business mix too. Of 308 cases in the second half of 2025, 240 concerned investments and only 67 concerned banking. So most complaints are about the trading side rather than the savings side — useful context, though it also means there is less public evidence about how they handle cash ISA problems specifically.

Case volumes rose from 198 in the first half of 2025 to 308 in the second, an increase of around 56%. Per-firm uphold rates are not published on the Ombudsman's website, so we cannot tell you how those cases were decided.

Where the 93% rate score comes from and what it does not tell you

Which?'s interest-rate score reflects what a provider pays across its range relative to the market. Trading 212's 93% says it pays consistently well, not merely that one headline product looks good.

The customer score is a different measure and sits lower at 74% — behind Leeds and Nationwide on 77%, ahead of Lloyds on 67%. And Trading 212 is not a Which? Recommended Provider, because that status requires strength on both measures.

Read together, the two scores say something coherent: excellent rates, decent but not exceptional service. For a cash ISA that you fund and leave, rates matter more than service. For anything where you expect to need help, the ranking would look different.

Who this suits and who it does not

It suits a rate-focused saver comfortable managing money in an app, who wants unlimited access without a penalty structure, and who does not want to diarise a bonus expiry.

It suits less well anyone who wants a traditional deposit-taker holding their money directly, anyone who may want branch or phone support, and anyone uneasy about holding cash on a platform whose main business is share dealing.

One practical point: because the rate is variable and not supported by a fixed bonus term, it can move at any time in either direction. It has been market-leading recently, which is not a guarantee about next year. Check it periodically like any variable account.

Figures were taken from each provider's own published terms on 15 August 2026. Variable rates can change at any time — confirm the current rate with the provider before applying.