Can I Transfer a Cash ISA to a Stocks & Shares ISA?

Yes. You can transfer money from a cash ISA into a stocks & shares ISA at any time, including from previous tax years and from the current tax year. The transfer must be done via the official ISA transfer process between providers — not by withdrawing the cash and re-paying it. The transferred funds keep their ISA tax-free status and don’t count against your current-year £20,000 allowance.

This is the mechanics and timing for the 2026/27 tax year.

The two ways to move ISA money — and why the difference matters

There are two ways to move money out of one ISA:

1. Official ISA transfer (always use this)

The cash ISA provider sends the money directly to the new stocks & shares ISA provider. The funds are tagged as “transfer in” — they retain their ISA wrapper status, don’t affect the current year’s £20,000 contribution limit, and don’t lose any tax-free history.

The new provider initiates the transfer with the old provider — you don’t touch the cash.

2. Withdraw and re-deposit (almost never use this)

You take the cash out of the ISA (it loses the wrapper status), then deposit it as a fresh contribution into the new ISA. The deposit counts against this year’s £20,000 allowance, regardless of how much you withdrew.

This is the wrong approach for transferring between ISAs. Only use it if you specifically want to pull the money out of the ISA wrapper entirely.

The single most common ISA mistake is withdrawing money from one ISA to manually fund another. Use the official transfer.

How the official transfer works

The process, step by step:

1. Open the new stocks & shares ISA with your chosen provider (Vanguard, Hargreaves Lansdown, AJ Bell, Trading 212, InvestEngine, etc.). The new account doesn’t need to receive a new contribution — it can be opened ready to receive a transfer.
2. Request the transfer in the new provider’s system. You provide the old cash ISA provider’s details, account number and the amount to transfer (full or partial).
3. Sign the transfer authorisation. Usually digital, sometimes by post — depends on providers.
4. Wait. The new provider contacts the old provider; the old provider verifies and releases the funds; the new provider receives and credits the new ISA. The standard regulatory timeframe is up to 15 working days for cash ISA transfers and up to 30 days for stocks & shares ISA transfers, but many providers complete in 5–10 days.
5. Invest the money in the new ISA. The cash sits in the new provider as uninvested cash until you choose investments.

You don’t touch the cash. The transfer happens between the two providers.

Will I lose interest while the cash is moving?

During the transfer period, the cash ISA stops paying interest (because the funds have been earmarked for transfer) and the stocks & shares ISA doesn’t pay interest (it’s for investment, not cash savings). For 5–15 working days, you earn nothing on the transferring cash.

This is usually negligible. On £20,000 at 4.5% for 10 days, the foregone interest is about £24. Not worth worrying about for most transfers.

If you have a fixed-rate cash ISA, transferring out early may incur a withdrawal penalty (typically 90–180 days of interest). Check your terms before initiating the transfer.

Does the £20,000 allowance get used by the transfer?

No. Transfers from previous years’ ISAs don’t use any of the current year’s allowance. They’re separate from new subscriptions.

For current-year contributions (money you paid into the cash ISA in 2026/27 that you now want to move to a stocks & shares ISA in 2026/27):

• Before April 2024: you had to transfer the entire current-year subscription if you wanted to move it. Partial transfers of current-year were not allowed.
• From April 2024 onward: partial transfers of current-year subscriptions are allowed. You can move £3,000 of your £15,000 current-year cash ISA contributions to a stocks & shares ISA, leaving £12,000 in the cash ISA — without breaking any rules.

The new flexibility (introduced with the April 2024 reform — see our multiple ISAs article) makes this kind of mid-year restructure much easier.

When transferring from cash to stocks & shares makes sense

A few situations where the move is worth considering:

• Long time horizon. Money you genuinely won’t need for 5+ years often performs better in equities than in cash, even after volatility.
• Real-return concern. Cash at 4.5% with 2.5% inflation gives roughly 2% real return. Equities have historically delivered 5–7% real over long periods.
• Diversification. If you have a lot in cash ISAs and nothing in stocks & shares, the asset mix may be unhelpfully heavy on cash.
• Better tax efficiency. Inside the ISA wrapper, both cash and investments are tax-free in the UK. But interest above the Personal Savings Allowance (outside an ISA) is taxable while ISA interest isn’t. The relative case for sheltering investments inside an ISA is even stronger than for cash, because investment dividends and gains are also tax-free.

When the move doesn’t make sense:

• You need the money within 5 years. Equities can drop 30%+ in a recession; you don’t want to be selling at the bottom to fund a planned expense.
• You’re uncomfortable with volatility. If a 20% paper loss would cause you to panic-sell, stay in cash and accept the lower return.
• The cash ISA is paying close to or above expected real equity returns. Rare but it happens — at peak BoE base rate (~5%), cash competed well against a 3% real equity return assumption.

What about transferring a fixed-rate cash ISA?

Fixed-rate cash ISAs typically charge an early withdrawal penalty if you transfer out before maturity. Common penalties:

• 1-year fix: 90 days of interest.
• 2-year fix: 120 days of interest.
• 3-year+ fix: 180 days of interest.

The penalty is taken from the transferred balance — you don’t pay it separately.

Calculate before transferring:

• Penalty cost: 90 days × £20,000 × 4.5% / 365 = ~£221.
• If the new stocks & shares ISA returns 5% over the next year on the same £20,000, that’s £1,000. Net benefit: £779 in year 1, then continued tax-free growth.

If the maturity is within 6 months and the penalty is large, waiting may be smarter.

What if my old provider doesn’t play ball?

Occasionally, transfers stall. Common reasons:

• Identity verification mismatch (name, address, NI number doesn’t match).
• Old provider system delay.
• New provider needs additional documentation.

The legal framework is clear: providers must complete cash ISA transfers within 15 working days and stocks & shares ISA transfers within 30 days, with extensions only by mutual agreement. If a transfer drags on, contact both providers; if necessary, complain via their formal complaints process and ultimately to the Financial Ombudsman Service.

Worked example: moving £25,000 from cash ISA to stocks & shares

Tom has £25,000 in a cash ISA paying 4.0%, accumulated over multiple tax years. He wants to invest for the long term.

• Step 1: Opens a stocks & shares ISA at a low-cost platform.
• Step 2: Initiates transfer of £25,000 from cash ISA to S&S ISA via the new provider’s online form.
• Step 3: Waits 8 working days for the transfer to complete.
• Step 4: £25,000 now sits as cash in the new S&S ISA. Tom invests £24,500 in a global index ETF (keeping £500 for dealing fees and a small cash buffer).
• Step 5: Continues making contributions for 2026/27 into the cash ISA (or the new S&S ISA, or another ISA — multiple ISAs are now allowed).

No allowance used. No tax wrapper lost. The £25,000 is now invested in equities inside the same tax-free shell.

Internal links

• Can I pay into two ISAs in the same tax year?
• What is a flexible ISA and how does it work?
• How many ISAs can I have at once?

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This guide is information, not regulated financial advice. Investments can fall as well as rise — moving from cash to equities is a meaningful change in risk profile. Consider talking to a regulated adviser before committing.