Yes. Cash ISA to Stocks & Shares ISA transfers are fully permitted and don't affect your £20,000 annual allowance. You can transfer all or part of a previous year's Cash ISA, or the full balance if it's current-year money. The process takes up to 30 days and the tax-free wrapper stays intact throughout.
Why This Transfer Is So Common
Cash ISAs are where UK savers park money when they're nervous about investing. Over one or two years, that's fine. Over a decade or more, cash tends to erode against inflation — even at 2026's better rates of around 4–5%, real returns are close to zero after inflation and tax on interest outside an ISA.
A global stock-market tracker has historically averaged around 7% a year over long periods. On £20,000, over 20 years, the difference between cash and equities can be well over £50,000. That's why so many UK investors eventually shift Cash ISA balances across to a Stocks & Shares ISA. Capital is at risk — the market can and does fall — but over long horizons the probability of equities beating cash has historically been high.
For a full breakdown of the trade-off, see our Stocks & Shares ISA vs Cash ISA 2026 comparison.
The Core Rule
An ISA transfer is an official HMRC process to move money from one ISA to another while keeping the tax-free wrapper. You initiate it with the new provider. They handle the rest.
Step-by-Step: How to Transfer a Cash ISA to a Stocks & Shares ISA
Step 1 — Choose your new Stocks & Shares ISA provider
This is the most important decision. Fees compound over decades. Compare platforms by:
- Platform fee (% of assets or flat)
- Fund choice (trackers, ETFs, investment trusts, individual shares)
- Minimum investment
- Regular investing support (reduced dealing charges for direct debits)
See our ranked guide to the best Stocks & Shares ISAs UK 2026 for the short-list.
Step 2 — Open an account with the new provider
Most platforms let you open an ISA online in under 10 minutes. You'll need your National Insurance number and proof of identity. Don't fund it with fresh money yet — you want the transfer to arrive first.
Step 3 — Complete the ISA transfer-in form
Inside your new account, find the "Transfer in an ISA" or "Transfer in" section. You'll need:
- The existing Cash ISA provider's name
- Your account number or sort code/account number
- The approximate balance
- Whether you want a partial or full transfer
Step 4 — Sign (electronically or on paper)
You're authorising the new provider to request the funds. Some providers still post physical forms; most are digital now.
Step 5 — Wait 15–30 days
The new provider contacts the old one. Your Cash ISA provider releases the funds. The balance arrives in your new Stocks & Shares ISA as cash.
Step 6 — Invest the cash
Don't leave it sitting in the cash account of your new platform indefinitely (interest is usually lower). Pick your funds or ETFs and invest. A global index tracker such as Vanguard's FTSE Global All Cap or HSBC's FTSE All-World is a common core holding.
How Long Does It Take?
HMRC rules set a maximum of 30 calendar days for Cash ISA to Stocks & Shares ISA transfers. In practice:
| Provider type | Typical transfer time |
|---|---|
| Major online platforms (HL, AJ Bell) | 15–20 working days |
| Newer app-based platforms (Trading 212, InvestEngine) | 7–15 working days |
| High-street banks (often slower) | 20–30 calendar days |
Tax-year-end (late March/early April) is the busiest time — transfers often run at the slower end of the range.
Partial vs Full Transfer
You can transfer all of a previous year's Cash ISA, or part of it. You don't have to move the whole balance.
For example: say you have £40,000 in a Cash ISA built up from previous tax years. You could transfer £20,000 to a Stocks & Shares ISA to dip your toe in and keep the other £20,000 in cash for short-term needs.
Current tax year money is different. If you've paid into your Cash ISA during the current tax year (since 6 April 2025), that current-year portion must be transferred in full. You can't split it.
If you want a mix, transfer previous-year money first and leave current-year contributions where they are until the new tax year begins.
Timing: When to Transfer
A few honest pointers:
Don't panic-transfer during a crash
If markets have just fallen 20% and the headlines are grim, that's usually not the wrong time to enter — but it feels terrible. If you're nervous, drip-feed. Transfer the cash, then invest it in monthly tranches (say £5,000 a month over six months) rather than a lump sum. You'll pay slightly less-optimal average prices if markets rise but feel a lot calmer if they fall further.
Avoid the last week of the tax year if you can
Everyone scrambles in early April. Providers get backlogged. If your transfer straddles the tax-year change, it's fine — the balance keeps its tax-free status — but it's less stressful to start in June or July.
Factor in any fixed-rate penalty
If your Cash ISA is a fixed-rate product still inside its term, you might lose 90–180 days of interest as a penalty for transferring out. Sometimes it's worth waiting until maturity. Sometimes it's not — run the numbers with our ISA fee calculator.
Current Year vs Previous Year — The Rule Everyone Gets Wrong
The 2025/26 UK tax year runs from 6 April 2025 to 5 April 2026. Any money you've paid into your Cash ISA during that window is "current-year" money. Everything else is "previous-year".
- Previous year money: transfer all or part — you choose
- Current year money: transfer all of it or none of it
Once you've transferred, the current-year money arrives at your Stocks & Shares ISA and continues to count as a 2025/26 contribution. You haven't used any fresh allowance by transferring.
When NOT to Transfer
Not every Cash ISA holder should move to investments. Skip the transfer if:
- Your horizon is under 5 years. Equities can fall 30–40% in a single year. Short horizons don't give markets time to recover.
- You'll need the money for a specific thing soon — house deposit in 2 years, a wedding, a car.
- Your emergency fund isn't sorted yet. Three to six months of expenses in accessible cash should come before investing.
- You've got expensive debt — credit cards at 25% APR beat any expected investment return, by a lot.
- You can't stomach watching the balance drop. Honest self-assessment matters. Panic-selling a Stocks & Shares ISA at the bottom is the fastest way to turn a paper loss into a real one.
UK Providers That Accept Cash → S&S ISA Transfers
All major UK Stocks & Shares ISA providers accept inbound Cash ISA transfers. The most popular:
| Provider | Platform fee | Accepts Cash ISA transfers? |
|---|---|---|
| InvestEngine | 0% (DIY) / 0.15% (managed) | Yes |
| Vanguard | 0.15% (capped at £375) | Yes |
| Trading 212 | 0% | Yes |
| Hargreaves Lansdown | 0.45% (capped on funds) | Yes |
| AJ Bell | 0.25% (capped) | Yes |
| Fidelity | 0.35% (capped) | Yes |
All of them accept inbound Cash ISA transfers for free — the only charge you might face is an exit fee from your existing Cash ISA provider, typically a fixed-rate penalty rather than a flat administrative fee.
FAQ
Can I transfer a Cash ISA to a Stocks and Shares ISA in the UK?
Yes. UK ISA rules permit Cash ISA to Stocks & Shares ISA transfers in full. The balance moves tax-free through the official transfer process and doesn't count against your £20,000 annual allowance.
How long does a Cash ISA to Stocks and Shares ISA transfer take?
HMRC allows up to 30 days. In practice most complete in 15–20 working days. The newer app-based platforms are often fastest. Expect longer waits at tax-year-end.
Will I lose my £20,000 ISA allowance if I transfer?
No. Transfers don't use your annual allowance. If you've used £15,000 of your 2025/26 allowance in the old Cash ISA, you'll still have £5,000 of fresh contribution room in the new Stocks & Shares ISA.
Can I transfer only part of a Cash ISA?
Yes — for previous tax year contributions. Current tax year contributions must be transferred in full, never split.
Is there a fee to transfer a Cash ISA to a Stocks and Shares ISA?
The receiving provider almost never charges to accept a transfer. A few Cash ISA providers — especially fixed-rate products still in term — charge exit penalties. Check your existing terms before initiating.