Cash ISA or stocks and shares ISA: Which one is right for you?
Published: 23 April 2026
Choosing the right ISA for you isn’t always easy. To help we’ve created a clear and simple guide to how cash ISAs and stocks and shares ISAs work, and what to consider when deciding between them.
Let’s get into it - what’s an ISA?
An ISA (or Individual Savings Account) is a way to save or invest without paying tax on the interest you earn or the returns you get.
There are four main types of ISA: cash, stocks and shares, lifetime and innovative finance.
All ISAs have a few things in common:
- You need to be at least 18 to open one
- For the 2026/2027 tax year you can save or invest up to £20,000 into a combination of ISAs (within the rules of each type)
- Up to that amount, your interest or investment returns are tax-free (this is changing for the 2027/2028 tax year for cash ISAs for those under the age of 65 - more on this later)
Junior variations of the cash and stocks and shares ISA are available for under-18s with a £9,000 tax-free allowance.
We'll now look at cash ISAs and stocks and shares ISAs in more detail. In case you didn’t know, we only offer cash ISAs.
Not all cash ISAs are the same
Cash ISAs come in a few different types, so you can choose one that suits how you want to save. For example, there are fixed or variable rate options, with either easy or limited access to your money.
An easy access cash ISA gives you the freedom to dip into your money when you need to - usually in return for a slightly lower rate of interest.
If you prefer to lock your savings away, a fixed rate cash ISA could reward you with a higher interest rate. However, if you need to access your money, it'll usually come with an interest charge.
You can only pay into one cash ISA in a tax year with us.
The cash ISA allowance is changing
If you’re considering a cash ISA in future, from 6 April 2027 there’s a change you need to know about.
The ISA allowance remains at £20,000 but if you’re aged under 65, the amount you could save in a cash ISA each tax year will reduce to £12,000.
But savers aged 65 and over aren’t affected – they’ll still be able to save their full £20,000 allowance in a cash ISA.
How about a stocks and shares ISA?
A stocks and shares ISA works differently to a cash ISA. It’s a way for you to put your money into investments, rather than holding it in cash. You don’t pay income or capital gains tax on any returns you make.
How is a stocks and shares ISA invested?
Your money is invested on your behalf by your chosen provider in assets such as shares, bonds, property or commodities. This is often in funds with other investors.
The idea is that over a longer period of time (at least five years), those assets (and your investment) grow in value. That could potentially mean bigger returns than saving in cash.
But there’s no guarantees. Because markets rise and fall, the value of your investments could go down as well as up - so there’s a risk you could get back less than you paid in.
Does a stocks and shares ISA pay interest?
No. Because your money is invested, any growth is called a return. That all depends on how your investment performs.
Cash ISAs vs. stocks and shares ISAs – what’s the difference?
Remember, both of these types of ISA form part of your annual £20,000 ISA allowance for 2026/2027. Here’s a simple look at how they differ.
Cash ISA
Might be right for you if…
- You need access to your money in the short-term
- You prefer lower-risk for your savings
- You want to save in cash without having to pay tax on the interest earned
Some things to bear in mind…
- The buying power of your cash savings could go down over time because of inflation
- More suited to short or medium term savings goals
- Withdrawals may be limited with some fixed rate accounts
Stocks and shares ISA
Might be right for you if…
- You’re comfortable investing your money over a longer period
- You’re happy to accept the ups and downs of financial markets
- You want to invest and not have to pay income or capital gains tax on any returns
Some things to bear in mind…
- The value of your investment could go up or down over time
- More suited to longer-term savings goals to help overcome any fluctuations in the financial markets
- There could be a short delay to access your money when you convert to cash
Can you have cash ISAs and stocks and shares ISAs?
Yes, you can have both. Depending on why you’re saving, you may want to think about having a mix of cash ISAs and stocks and shares ISAs. That way you could balance access to your money as well as potential growth and risk. And whichever ISA you choose, remember, there’s no tax to pay.
Cash ISA vs. stocks and shares ISA - what’s the verdict?
“Whether a cash ISA or a stocks and shares ISA is right for you depends on your savings goals and the level of risk you want to take with your money.”
“Remember, you don’t need to pick just one. You could split your ISA allowance across different types of ISAs (within the rules), giving you flexibility to balance access and growth with risk and security. And whatever you choose, you’ll still be saving in a tax efficient way.”
Catherine Wray, Senior Product and Pricing Manager
Open a cash ISA online
We can’t help you open a stocks and shares ISA – as we don’t offer them. But we do have a range of cash ISAs to choose from, including fixed and variable rate options with easy or limited access.
View our cash ISAs
Cash ISAs are available to individuals aged 18 or over who are resident in the UK for tax purposes.
The tax treatment depends on the individual circumstances of each customer and may be subject to change in the future.
This article is not advice and you should seek independent financial or legal advice if needed.
