If you might need the money in the next five years, or it’s your emergency fund, a cash ISA is usually the better home because its value can’t fall. If you can leave the money alone for five years or more, a stocks and shares ISA has historically given you a better chance of beating cash and inflation, but its value can go down as well as up. You don’t have to pick one: you can split your £20,000 ISA allowance across both.

Budget update, 28 October 2026: the planned cut to the cash ISA limit has been scrapped. From April 2027 you’ll still be able to put the full £20,000 into cash if you want to, whatever your age. I’ve explained exactly what changed, and what it means for this decision, below.

Cash ISA vs Stocks and Shares ISA: what’s the difference?

Both are ISAs (individual savings accounts), which are tax-free wrappers the government lets you put money into each tax year. The only real difference is what happens to your money once it’s inside.

A cash ISA is a savings account where the interest is tax-free. A stocks and shares ISA is an investment account where any growth, dividends (the share of profits some companies pay out) and interest are tax-free.

	Cash ISA	Stocks and Shares ISA
What it holds	Cash, earning interest	Investments such as funds, shares, ETFs (exchange traded funds, a ready-made basket of investments you buy like a share) and bonds. You can also hold some cash
Allowance in 2026/27	Up to £20,000, shared across all your ISAs	Up to £20,000, shared across all your ISAs
From 6 April 2027	Still up to £20,000 (the planned £12,000 cut has been scrapped)	Still up to £20,000
Can the value fall?	No, not in pounds. Inflation can still eat into what it buys	Yes. You could get back less than you put in
Where returns come from	Interest, fixed or variable	How your investments perform. Not guaranteed
Tax inside the ISA	No Income Tax on interest	No Income Tax, dividend tax or Capital Gains Tax
FSCS protection	Up to £120,000 if your bank goes bust	Up to £85,000 if the firm fails. Not for falls in value
Getting your money out	Quick from easy access; fixed rates may charge a penalty	Sell, then withdraw, which can take a few working days
Usually suits	Emergency funds and goals within about five years	Goals five years or more away, like retirement

Children face the same choice. A Junior ISA also comes as cash or stocks and shares, and I’ve compared the best junior stocks and shares ISA providers on fees.

What changed for ISAs at the 28 October 2026 Budget?

At the Autumn Budget 2025, the government announced that from 6 April 2027 people under 65 would only be able to put £12,000 a year into cash ISAs. It later set out extra rules to stop people getting round that limit, including a ban on moving money from a stocks and shares ISA into a cash ISA and a charge on interest earned on cash sitting inside a stocks and shares ISA.

The 28 October 2026 Budget reversed all of that. Here’s where things stand now:

The cash ISA limit stays at £20,000 for all savers aged 18 and over from 6 April 2027. There’s no longer a different limit for under-65s.
The overall ISA allowance is still £20,000 a year, shared across all your ISAs.
The anti-workaround rules are gone too. HMRC has confirmed the rules that came with the £12,000 limit will not take effect, so the planned transfer ban and the charge on cash held in stocks and shares ISAs won’t happen.
A new incentive for first-time investors is being explored. The government will work with the industry on a new ISA incentive for people investing in a stocks and shares ISA for the first time. There are no details yet.

One step is still to come. The regulations that brought in the £12,000 limit are being revoked, and that change is due to be laid before Parliament in November 2026. The government and HMRC have both confirmed the policy, so this is the formal paperwork. We’ll update this page when it’s done.

Why a cash ISA matters more from April 2027

The same Budget raised tax on savings interest. From 6 April 2027, interest above your tax-free allowances will be taxed at 24% for basic rate taxpayers, 44% for higher rate and 49% for additional rate. Right now those rates are 20%, 40% and 45%.

Your Personal Savings Allowance, the interest you can earn outside an ISA each year before tax kicks in, isn’t changing. It’s £1,000 if you’re a basic rate taxpayer, £500 if you’re a higher rate taxpayer and nothing if you’re an additional rate taxpayer. Interest in a cash ISA doesn’t use it up at all.

Here’s £30,000 in a normal savings account earning an example 4% a year, which pays £1,200 of interest:

Your tax band	Interest above your allowance	Tax in 2026/27	Tax from April 2027	Tax in a cash ISA
Basic rate	£200	£40	£48	£0
Higher rate	£700	£280	£308	£0
Additional rate	£1,200	£540	£588	£0

If your interest is well under your allowance, an ISA won’t save you tax today. But balances grow and rates move, and money you’ve already put in an ISA stays tax-free year after year. If your other income is under £17,570, you may also get the starting rate for savings, which lets you earn up to £5,000 of interest tax-free.

What is a Cash ISA?

A cash ISA is a savings account with a tax-free wrapper. There’s no more to it than that. You save just like you would in a normal savings account; the difference is you never pay tax on the interest. I go through the rules in more detail in how a cash ISA works.

Cash ISAs mainly differ on the interest rate and when you can get your money out:

Easy access: take money out whenever you like. These usually pay a bit less because of that flexibility, and the rate can change.
Fixed rate: you lock your money away for a set time, such as one or five years, for a set rate. Taking it out early can mean a penalty, or it may not be allowed.
Notice: you give a set amount of notice, say 90 days, before you can withdraw.
Flexible: a feature some cash ISAs have. You can take money out and put it back in the same tax year without it using up more of your allowance.

Cash ISA rates broadly follow the Bank of England’s Bank Rate, which is 4% (the next decision is due on 17 December 2026). When Bank Rate sat close to zero for most of the 2010s, cash ISAs barely paid anything, so they’re far more useful now than they were.

Pros of a Cash ISA

Your balance can’t fall in pounds
Interest is tax-free and doesn’t count towards your Personal Savings Allowance
Easy access versions make a good home for an emergency fund
You can have more than one, and pay into more than one in the same tax year
If you die, your spouse or civil partner can get an extra ISA allowance on top of their own, up to the value of your ISA

Cons of a Cash ISA

Inflation can outpace the interest, so your money buys less over time
Over long periods, cash has usually grown less than investments
Variable rates can drop when Bank Rate falls
Fixed-rate accounts can charge penalties or block early withdrawals

What is a Stocks and Shares ISA?

A stocks and shares ISA is an investment account with a tax-free wrapper. You can put up to £20,000 a year in and buy funds, shares, ETFs and bonds, and you won’t pay tax on anything they make. I cover the mechanics in how a stocks and shares ISA works.

Outside an ISA, in a general investment account, you’d pay dividend tax on dividends above the £500 dividend allowance (10.75%, 35.75% or 39.35% in 2026/27, depending on your tax band) and Capital Gains Tax on profits above £3,000 a year. Basically, without an ISA, the more you make from investing, the more Westminster takes off you.

The beauty of a stocks and shares ISA is the gift of time. As your money grows and you reinvest what it makes, it starts to roll like a snowball down a hill, getting bigger and bigger. That’s compounding: earning returns on your returns.

When you invest, your capital is at risk.

Doing it yourself or using a ready-made option

There are two main ways to run one. With a self-invested ISA you choose what to buy and sell, which gives you full control but means it’s all on you. With a ready-made or managed ISA, you answer some questions about your goals and how much risk you’re comfortable with, and the provider puts you into a mix of funds. Fees for managed options are usually a bit higher.

If you’re new to investing, I wouldn’t start by picking individual shares. I’d start with a ready-made or managed option, learn all I could, and slowly move to doing it myself.

Pros of a Stocks and Shares ISA

More potential for long-term growth than cash, although it isn’t guaranteed
No Income Tax, dividend tax or Capital Gains Tax on anything inside it
You can take money out at any time (you sell first)
You can hold some cash inside while you decide what to buy
Your spouse or civil partner can inherit your ISA allowance if you die

Cons of a Stocks and Shares ISA

You can get back less than you put in
Prices can swing a lot from one year to the next
There are fees, such as platform and fund charges, which eat into returns
Selling after a fall locks in the loss
No tax relief on the way in, unlike a pension (see SIPP vs ISA)

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Can you hold cash in a Stocks and Shares ISA?

Yes. Most stocks and shares ISAs let you hold some of your money as cash, for example while you decide what to buy or after you’ve sold something. Some providers pay interest on it and some pay very little or nothing.

The charge on interest from cash in stocks and shares ISAs that was planned for April 2027 has been scrapped, so holding cash there won’t be penalised. Even so, a stocks and shares ISA isn’t built to be a savings account. If you want to hold cash for the long term, a cash ISA is purpose-built for it, with a clear interest rate and FSCS deposit protection.

Cash ISA or Stocks and Shares ISA: which should you choose?

It mostly comes down to two things: when you’ll need the money, and how you’d feel watching it drop.

What the money is for	Usual fit	Why
Emergency fund (how much you need in an emergency fund)	Easy access cash ISA	You need it fast and can’t risk it being down when you do
A goal within about five years, like a car or a wedding	Cash ISA, fixed rate if you know the date	Not enough time to ride out a market fall
Your first home	Cash ISA, or a Lifetime ISA if you’re eligible	A Lifetime ISA adds a 25% bonus, up to £1,000 a year
Goals five to ten years or more away	Stocks and shares ISA	More time to recover from falls and for compounding to work
Retirement	Stocks and shares ISA alongside a pension	Long time horizon; pensions add tax relief

If you want to build wealth over the long term and beat inflation, a stocks and shares ISA has historically been the better tool. That said, cash ISAs have plenty going for them, and keeping your options open matters. Cash ISAs are great for money you might need in the next year to five years. Just don’t expect them to make you rich, because they won’t.

Quick checks before you invest

Have you cleared expensive debt, like credit cards? Their interest usually costs more than investing is likely to make.
Do you have an emergency fund in cash, so you won’t be forced to sell investments at a bad time?
Can you leave this money alone for at least five years?
If it fell by a fifth in a bad year, could you sit tight rather than panic sell?
Do you understand what you’re buying and what it costs in fees?

We put this exact debate to full-time trader Michael Taylor on the podcast, alongside whether to invest in the S&P 500 or UK stocks.

Cash vs investing: what the difference looks like over 10 years

Here’s £10,000 left alone for ten years, with nothing else added. The rates are examples to show the gap, not predictions.

Example	After 10 years
Cash ISA paying 3.5% a year	£14,106
Stocks and shares ISA growing 5% a year after fees	£16,289
Stocks and shares ISA growing 8% a year after fees	£21,589

Growth isn’t guaranteed. Real investments don’t grow in a straight line, and one bad year can knock a big chunk off: a 20% fall would take £10,000 down to £8,000 for a while. Cash rates change too. Over short periods, cash can easily come out on top, which is exactly why time matters so much here.

Try your own numbers below. Keep the growth rate sensible and remember fees and inflation aren’t included.

How I use both a Cash ISA and a Stocks and Shares ISA

I have both a cash ISA and a stocks and shares ISA. Why? My emergency fund sits in a flexible cash ISA, and a small savings pot sits in a fixed cash ISA.

The emergency fund is there in case something goes horribly wrong, like the car breaking down, so I need to be able to get at it. The savings pot is a hedge, a bit of protection in case the whole stock market crashes and burns. That one’s in a five-year fixed ISA so I get the most interest I can.

Everything else goes into a stocks and shares ISA, because I want long-term growth and the compounding you get from paying in regularly. My short-term goal is access. My long-term goal is financial freedom.

How to split your ISA allowance between cash and investments

You can put up to £20,000 into ISAs each tax year, which runs from 6 April to 5 April. You can put it all in one account or split it however you like. For example:

£5,000 in a cash ISA and £15,000 in a stocks and shares ISA
£10,000 in one cash ISA, £3,000 in another cash ISA and £7,000 in a stocks and shares ISA

Since April 2024 you’ve been able to pay into more than one ISA of the same type in a tax year (you can still only pay into one Lifetime ISA). Personally, I wouldn’t have more than two or three on the go, as it just gets too hard to keep track of.

Any allowance you don’t use by 5 April is gone; it doesn’t roll over. If your ISA is flexible, taking money out doesn’t cost you allowance. Say you pay in £10,000 and take out £3,000: with a flexible ISA you could still pay in £13,000 that year, but with a non-flexible one only £10,000.

Can you move money between a Cash ISA and a Stocks and Shares ISA?

Yes, in either direction, at any time. You can move all or part of it, including money you paid in during earlier years, and it doesn’t use up any of this year’s allowance.

The key is to use a proper ISA transfer. Ask the provider you’re moving to and fill in their transfer form. If you withdraw the money yourself and pay it back in, you lose that part of your tax-free allowance. Transfers between cash ISAs should take no more than 15 working days, and other transfers no more than 30 calendar days. Check for exit fees or fixed-rate penalties first. My step-by-step guide to transferring an ISA walks through it.

The ban on moving money from a stocks and shares ISA into a cash ISA, which was due to start in April 2027 for under-65s, has been dropped.

Are Cash ISAs safer than Stocks and Shares ISAs?

In the sense that the balance can’t fall, yes. But “safe” means two different things here.

If your provider goes bust: the FSCS (Financial Services Compensation Scheme) protects cash up to £120,000 per person per bank, building society or credit union, a limit that rose on 1 December 2025. Brands that share one banking licence share one limit. For investments, it covers up to £85,000 per person per firm if the firm fails and can’t return your money.
If markets fall: nothing protects you. The FSCS doesn’t cover investments going down in value. That’s the risk you take for the chance of higher growth.

What about inflation?

Inflation is prices going up over time: food, energy, petrol, clothes, you name it. Prices rose 3.5% in the 12 months to September 2026, against the Bank of England’s 2% target. If your interest is lower than inflation, your money is shrinking in what it can buy, even though the number in your account goes up.

To put that in pounds: if prices rose 3.5% a year for ten years, you’d need £14,106 just to buy what £10,000 buys today. So in the example above, the cash ISA would have kept pace, not got ahead. That’s why a long-term plan matters for money you won’t need for years. Every time you invest, you buy yourself a day to enjoy later in life.

FAQs

Is the cash ISA limit still being cut to £12,000 in 2027?

No. The 28 October 2026 Budget scrapped the cut. The cash ISA limit stays at £20,000 for all savers aged 18 and over from 6 April 2027, and the related transfer ban and charge on cash in stocks and shares ISAs won’t happen either. The formal change to the regulations is due in November 2026.

Can you have both a cash ISA and a stocks and shares ISA?

Yes. You can pay into both in the same tax year, as long as your total across all ISAs stays within £20,000. Plenty of people use cash for short-term savings and investments for long-term growth.

Can you lose money in a stocks and shares ISA?

Yes. Investments can fall as well as rise, and you could get back less than you put in, especially if you need to sell after a fall. The ISA only protects you from tax, not from markets.

Should I move my cash ISA into a stocks and shares ISA?

It depends on when you’ll need the money. Your emergency fund and anything needed within about five years usually stays in cash; money you can leave longer is where investing has historically done better. If you move it, use an ISA transfer, not a withdrawal, to keep it tax-free.

Can I transfer from a stocks and shares ISA back to a cash ISA?

Yes. Transfers work in both directions. The ban on this for under-65s that was planned for April 2027 has been dropped.

Is a cash ISA worth it if I don’t pay tax on my savings anyway?

It can be, as savings tax rises from April 2027 and ISA money stays tax-free for good. But if a normal savings account pays more and you’re well inside your allowance, it can be the better deal. I compare them in ISA vs savings account.

Which is better for a house deposit?

If you’re buying within about five years, cash is usually the safer home, because a market fall just before you buy could cost you. If you’re a first-time buyer aged 18 to 39, a Lifetime ISA adds a 25% bonus on up to £4,000 a year, for homes costing £450,000 or less. The government plans to replace it with a new First Time Buyer ISA for new savers from April 2029.

Stocks and Shares ISA vs Cash ISA: the bottom line

Both have their place. A cash ISA is for safety and access in the short term. A stocks and shares ISA is for building wealth over the long term, accepting the ups and downs along the way.

After the October 2026 Budget you still have the full £20,000 to split however suits you, including all of it in cash from April 2027. With savings tax going up that same month, the ISA wrapper is worth more than it was. Many apps let you start investing with very little, and over time compounding does the heavy lifting.