How to Transfer an ISA Without Losing Your Tax-Free Status

Here is the rule that trips up thousands of savers every year: if you want to move an ISA and keep it tax-free, you must never touch the money yourself. The moment you withdraw cash from an ISA and pay it into a new account, it stops being ISA money. To transfer an ISA the right way, you leave the cash inside the wrapper and let your new provider pull it across for you.

That single distinction — transfer versus withdraw — decides whether years of tax-free growth survive the move. This guide walks through exactly how to transfer an ISA without losing your allowance, how long each type of transfer takes, what changed in April 2024, and why 2026 is a pointed moment to review where your money sits. If you are weighing where to move it, our structured ETF investing and trading course covers how to put a stocks and shares ISA to work once the transfer completes.

How do you transfer an ISA without losing tax-free status?

To transfer an ISA without losing tax-free status, you ask your new (receiving) provider to arrange the transfer — you do not withdraw the money and re-pay it. The receiving provider contacts your old provider, verifies your details, and moves the balance directly between the two ISA wrappers. The cash never lands in your own bank account, so it never loses its tax-free status.

This is the part beginners get wrong. An ISA is a tax wrapper, not an account you can freely empty and refill. Once money leaves the wrapper into your hands, HMRC treats putting it back as a brand-new subscription that eats into this year's allowance.

Get the process right and the benefits compound. You can move providers as often as you like, chase better rates or lower fees, and consolidate scattered ISAs — all while every pound stays sheltered from tax on interest, dividends and capital gains.

The one mistake that destroys your tax-free wrapper

The single most expensive mistake is the withdraw-and-redeposit. Say you have £40,000 built up over several years in an old cash ISA. You spot a better rate elsewhere, withdraw the £40,000, and try to pay it into the new ISA. You cannot — the annual limit is £20,000, so £20,000 is refused, and the sheltered status of the whole sum is gone.

Do it as a transfer instead and the entire £40,000 moves across untouched, because transfers sit outside the annual allowance completely.

Transfers are also how you tidy up. If you have opened a new cash ISA most years, you may have five or six old wrappers scattered across providers, each stuck on a forgotten rate. Consolidating them into one modern ISA through successive transfers costs nothing in allowance and makes the money far easier to track, compare and manage.

Where a flexible ISA fits — and where it does not

A flexible ISA is a separate feature that lets you withdraw money and replace it within the same account and same tax year without using fresh allowance. It is useful for short-term access, but it is not a substitute for a transfer. It only works inside one account with one provider — you cannot use it to shuffle money to a rival provider and keep the wrapper. For moving between providers, the formal transfer is the only safe route.

How long does an ISA transfer take?

Timelines depend on what you are moving. Under industry transfer guidelines, a cash ISA to cash ISA transfer should complete within 15 business days, while other ISA transfers should complete within 30 calendar days. Moving actual investments — an in-specie transfer, where your holdings move without being sold — takes longer because each fund line is re-registered separately.

What this means for you: if you are moving cash and the transfer drags past 15 business days, you are entitled to redress. Providers should backdate the interest or compensate you for the loss, so a slow transfer does not cost you money — but you have to notice and chase it. Diarise the deadline the day you submit the form.

Can you transfer part of an ISA?

Yes — but how much freedom you have depends on whether the money is from this tax year or an earlier one. This is where the April 2024 reforms changed the picture. Money you paid in during previous tax years has always been flexible. Money paid in during the current year used to have to move as one lump; since April 2024, partial current-year transfers are allowed — but only if your provider chooses to offer them.

Sources: Royal London for advisers, 2026; M&G, 2024; HMRC ISA Managers' Guidance, 2024.

The practical upshot: if you have paid into an ISA this year and want to move it, ask the new provider whether they accept partial current-year transfers before you start. April 2024 also brought a second helpful change — you can now hold and pay into more than one ISA of the same type in a single tax year, which makes splitting money across providers far easier than it used to be.

Switching types: cash ISA to stocks and shares ISA

One of the most valuable moves the rules allow is switching a cash ISA into a stocks and shares ISA (or the reverse). Prior-year cash can move into investments in any amount, and the transfer keeps its tax-free status the whole way across.

Why savers make the switch

Cash is comfortable but it rarely beats inflation over long horizons. If money you will not need for five years or more is sitting in a low-rate cash ISA, moving part of it into a stocks and shares ISA gives it a chance to grow — while staying inside the tax wrapper. If you are still deciding between the two wrappers, our guide to a stocks and shares ISA versus a general investment account lays out the tax difference in detail.

What to check before you switch

Two things. First, a cash-to-investment transfer means your money is out of the market during the move — if markets rise in that window, you miss it. Second, check exit fees on the old ISA and platform charges on the new one. A cheaper wrapper is only cheaper after fees. For longer-term goals, it is also worth comparing an ISA against a pension using our SIPP versus ISA tax-wrapper comparison.

One way to manage the out-of-market risk is to switch in stages — move part of a large cash balance now and the rest over the following weeks, rather than transferring the whole lot in a single window. Prior-year money allows exactly this kind of partial, phased move, so you are never fully exposed to one day's price.

Why 2026 is the year to review your ISA

Britain is not short of ISA money — it is short of active ISA money. The numbers below show a market that is huge, heavily skewed to cash, and increasingly poorly paid.

Sources: HMRC via Castle Trust Bank, 2026 (£872bn stock, April 2024); CACI via Quilter, 2026 (£338bn at ≤1.5%); GOV.UK/HMRC, 2026 (allowance).

Here is why that matters. The big-five banks' easy-access ISAs pay around 1.53% on average, while best-buy ISAs are available above 4.00% — more than double the return on the same tax-free money. On a typical low-paying balance of £6,593, that gap is real cash left on the table every year, purely for not transferring.

The scale is easy to underestimate. Of that £872bn, roughly £360bn sits in cash ISAs and £511bn in stocks and shares ISAs, and around 15 million adult ISAs were subscribed to in 2023/24 alone. A large share of the cash has never been reviewed since the day it was opened, quietly earning whatever rate the provider chose to drop it to.

There is also a deadline forming. From April 2027, the cash ISA allowance for under-65s is being cut from £20,000 to £12,000. That makes the current tax years an unusually good window to get money into the right wrapper — and to consolidate stale, low-paying ISAs into something that works harder. If a Lifetime ISA is part of your plan, read how the Lifetime ISA bonus and penalty interact with the rest of your allowance first.

How to transfer an ISA, step by step

The whole process is designed to be hands-off once you start it. Follow these five steps and the wrapper stays intact.

1. Choose the receiving provider first. Compare rates, fees and the ISA type you want before you move anything. The receiving provider drives the whole transfer.
2. Open or nominate the receiving ISA. You need an account ready to receive the money on the other side.
3. Complete the receiving provider's ISA transfer form. You supply your old provider's details and account number — not a withdrawal request. Specify full or partial, and which tax years.
4. Let the new provider pull the money. Do nothing else. If you are tempted to speed it up by withdrawing the cash yourself, stop — that is the mistake that loses the wrapper.
5. Confirm it landed and check the clock. If a cash transfer passes 15 business days, contact the provider and ask for backdated interest or compensation.

That is the entire process. The hardest part is choosing where to move to — the mechanics are just a form.

Frequently asked questions

The value of investments held in a stocks and shares ISA can fall as well as rise, and you may get back less than you put in. This article is educational content, not personal financial or tax advice; check current rules for your circumstances before acting.