How to Transfer a Cash ISA: The Complete Step-by-Step Guide for 2026

The gap between the best and worst cash ISA rates has widened dramatically. Top easy-access cash ISAs are paying up to 4.68%, while plenty of high street banks are still offering 1.5-2.5% on older accounts. On a £20,000 ISA balance, that's the difference between earning £936 and £300 a year — tax-free.

But the real urgency comes from the Autumn Budget 2025 announcement: from 6 April 2027, anyone under 65 will only be able to contribute £12,000 per year to a cash ISA, down from the current £20,000. The remaining £8,000 of your ISA allowance must go into stocks and shares, innovative finance, or a Lifetime ISA.

What this means in practice: the cash you've already sheltered in ISAs becomes harder to replace. If you withdraw £10,000 from your cash ISA to "transfer" it (don't — more on that below), you've permanently lost that tax-free space. You can only refill it at £12,000 a year from 2027.

This is the single most important thing to understand about ISA transfers. If you withdraw cash from your ISA and deposit it into a new one, HMRC treats that deposit as a new contribution against your annual £20,000 ISA allowance. Your old tax-free wrapper is gone.

Say you have £45,000 across three years of cash ISA savings. Withdraw it to move providers and you can only put £20,000 back this tax year. The remaining £25,000 sits outside the ISA wrapper, and from April 2027, you'll only be able to shelter £12,000 per year — meaning it would take over two years just to get back to where you started.

The correct way: always use the official ISA transfer process. Your new provider handles everything, and your full balance moves across with its tax-free status intact. It doesn't touch your annual allowance at all.

I've seen forum posts from people who withdrew five-figure ISA balances thinking they could just redeposit. They couldn't. Don't be that person.

The process is straightforward once you know the steps:

Step 1: Choose your new provider. Compare rates — but also check whether they accept transfers in. Not all accounts do, particularly some of the headline-grabbing introductory rate offers. Look for "accepts ISA transfers" explicitly.

Step 2: Open an account with the new provider. You can usually do this online. You'll need your National Insurance number, proof of identity, and details of your existing ISA (provider name, approximate balance, account number if you have it).

Step 3: Complete the ISA transfer form. This is provided by your new provider — you don't need to contact your old one at all. The form authorises the new provider to request the transfer on your behalf. Since the 2025/26 ISA rule changes, you can now do partial transfers of current-year contributions — previously it was all or nothing for the current tax year.

Step 4: Wait. GOV.UK states that cash-to-cash ISA transfers must complete within 15 working days (that's three calendar weeks). Transfers involving stocks and shares get 30 calendar days. In practice, many electronic transfers complete in 5-10 working days.

Step 5: Verify. Check that the full balance has arrived and the interest rate matches what you were offered. If anything looks wrong, contact your new provider immediately.

The ISA reforms that took effect on 6 April 2025 make transfers more flexible than they've been in years:

Multiple ISAs of the same type. You can now hold more than one cash ISA in the same tax year. Before April 2025, you could only pay into one cash ISA per year. This means you can open a new cash ISA for this year's contributions while keeping your existing one — no transfer needed if you just want to split your money.

Partial transfers of current-year money. Previously, if you wanted to transfer current-year contributions, you had to move the entire amount. Now you can transfer a portion. This is useful if you want to split between a high-rate fixed account and an easy-access account.

Previous-year transfers unchanged. You've always been able to transfer all or part of previous years' ISA savings. That hasn't changed.

These reforms are particularly relevant if you're planning around the April 2027 cash ISA limit reduction. You might want to maximise your cash ISA contributions this year (up to £20,000) while you still can, and use transfers to consolidate existing savings with the best-rate provider. For more on maximising this year's allowance, see our ISA season planning guide.

Transferring from an easy-access cash ISA is penalty-free. But if your money is in a fixed-rate cash ISA that hasn't matured, you'll likely face an early closure penalty — typically 90 to 180 days' loss of interest, depending on the provider and term length.

Do the maths before you transfer. If your fixed-rate ISA is paying 4.0% and matures in four months, the penalty for early exit might wipe out any benefit from switching to a 4.5% account. But if you're sitting on a fixed rate from 2023 paying 3.0% with 18 months left, the numbers could easily work in your favour.

Some providers also charge admin fees for outbound transfers — typically £25-£50. These are less common for cash ISAs than for stocks and shares, but check the terms.

One strategy: wait for your fixed-rate ISA to mature, then transfer during the maturity window. Most fixed-rate ISAs give you 14-30 days after maturity to withdraw or transfer without penalty before they roll into a lower default rate.

The 15 working day deadline for cash ISA transfers is a regulatory requirement, not a suggestion. If your transfer is dragging past three weeks, here's what to do:

Contact your new provider first. They initiated the transfer and should be tracking it. Ask for a specific status update — is the delay on their end or the old provider's?

Escalate to the old provider. Some legacy providers are notoriously slow. If they're dragging their feet, a formal complaint often speeds things up.

Financial Ombudsman Service. If you've complained and aren't getting anywhere, the Financial Ombudsman handles ISA transfer complaints. They can also order compensation if you've lost interest due to unreasonable delays.

The timing matters more than usual right now. If you're trying to transfer before 5 April to use this year's allowance at a new provider, start the process by mid-March at the latest. Leaving it to the last week of March is asking for trouble — a transfer that arrives on 7 April counts against next year's allowance if you're making new contributions alongside the transfer.

Before you transfer, it's worth asking whether a cash ISA is still the right home for your money. The Personal Savings Allowance gives basic-rate taxpayers £1,000 of tax-free interest per year (£500 for higher-rate). If your total savings are modest, you might earn more in a standard savings account — some easy-access accounts are paying slightly above ISA equivalents.

But here's the thing: the PSA hasn't increased since 2016, and there's no guarantee it will. Meanwhile, the value of ISA sheltering compounds over time. If you're a higher-rate taxpayer, or expect to be, the ISA wrapper saves you 40% on interest above the £500 PSA threshold.

With the cash ISA limit falling to £12,000 from April 2027, there's an argument for stuffing your cash ISA to the full £20,000 this year even if you don't strictly need the tax shelter yet. You can't get that allowance back once it's gone.

For a deeper comparison of cash ISAs and investment alternatives, see our guide to ISA types and our analysis of cash vs investments in 2026.

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