Trading 212 Cash ISA Review

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Trading 212's cash ISA pays 3.6% AER from £1, and the number is not set by anybody's marketing department. It is the Bank of England base rate minus 0.15 percentage points, published as a formula: with the base rate held at 3.75% since 17 September 2026, that arithmetic gives 3.60% exactly.

Two months ago this page described Trading 212 as the best rate in this comparison, at around 4.56%. It is now the lowest — below Moneybox's Open Access ISA at 3.80%, below Nationwide's fixed ladder and below Leeds. That is not a reversal of policy, it is the tracker doing exactly what it says: the rate followed the base rate down. Trading 212 still holds the highest Which? interest-rate score here at 93%, ahead of Leeds on 87% and Nationwide on 70%, but that was scored in August 2026 when the rate was a point higher, so read it as a statement about the past.

What you get instead of a market-leading rate is a rate you can predict. Every other variable account in this comparison can be repriced at the provider's discretion; this one moves only when the Bank of England moves, and Trading 212 undertakes to give 14 days' notice if it ever widens the 0.15-point margin.

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. One large high-street bank 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. It is also the only flexible ISA in this comparison — money you take out can be put back in the same tax year without using fresh allowance. Neither Moneybox nor Leeds offers that, and Moneybox says so explicitly in its terms.

That simplicity removes the failure mode that catches most savers: the forgotten bonus expiry, the accidental fourth withdrawal, the balance that dipped below a threshold. The honest question now is what it is worth. On £10,000, Moneybox’s headline 4.71% pays about £111 more a year than 3.6%, and its Open Access account about £20 more. If you will genuinely never breach a withdrawal limit or miss a bonus expiry, those conditions cost you nothing and the extra interest is free. Trading 212 is the account for people who know they will not do the admin — and it now charges a visible premium for that.

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 paid consistently well across the survey period, not merely that one headline product looked good on the day. It is worth being clear about the date: the survey was August 2026, when this cash ISA was paying around 4.56%. At 3.6% the same score would not be awarded today, and nobody should open the account on the strength of it.

The customer score is a different measure and sits lower at 74% — behind Leeds and Nationwide on 77%, ahead of one large high-street bank 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, and it is the whole case for the account: because the rate is a published tracker rather than a discretionary one, you can work out what it will be. If the Bank of England cuts to 3.50% in November, this account pays 3.35% the same day; if it holds, you stay at 3.6%. That is a different kind of certainty from a fixed rate, and a more useful one than a variable rate nobody can forecast — but it also means there is no prospect of it beating the market again unless the base rate rises.

Figures were taken from each provider's own published terms on 7 October 2026. Variable rates can change at any time — confirm the current rate with the provider before applying.