For people comparing Individual Savings Accounts (ISAs), Cash ISAs and Stocks & Shares ISAs are two common options, each offering a tax‑efficient way to potentially grow your money under current rules, but with different benefits and considerations depending on your circumstances.
In this guide, we'll explore some key differences between Cash ISAs and Stocks & Shares ISAs, including how they work, how any returns are generated, and the level of risk involved. We’ll also look at factors like access, time horizons, and flexibility, helping you compare both options and understand how they might fit your approach to saving or investing.
This information is for general guidance only and does not constitute personal financial advice. Whether an ISA is suitable depends on your individual circumstances. Tax treatment depends on individual circumstances and may be subject to change.
What is a Cash ISA?
A Cash ISA is a type of Individual Savings Account that allows people to hold cash savings in a tax‑efficient way. It works similarly to a standard savings account, where you deposit money and earn interest over time.
The key difference between a Cash ISA and a standard savings account is that any interest earned within the ISA is free from UK income tax and capital gains tax, meaning you can take advantage of its tax benefits under current rules. Tax treatment depends on individual circumstances and may change.
Cash ISAs are used for saving rather than investing and may suit people who prefer lower risk and easier access to their money, depending on the specific account features.
Scottish Friendly does not provide Cash ISAs.
What is a Stocks and Shares ISA?
A Stocks and Shares ISA, also known as an investment ISA, is a type of ISA that allows people to invest their money through a range of investments like funds, shares, and bonds.
The assets included in a Stocks and Shares ISA might be shares in companies, funds, or bonds. The different investment options available will depend on the provider and the setup of the account.
It is a tax-efficient way to save or invest, as any potential income or growth within the account is protected from UK income tax and capital gains tax. Tax treatment depends on individual circumstances and may change.
Unlike a Cash ISA, the money in a Stocks and Shares ISA is invested. You may need to sell investments before accessing your money. Keep in mind that the value of stock market investments can go down as well as up, so you could get back less than you've paid in.
Scottish Friendly specialises in providing Stocks & Shares ISAs.
How does a Cash ISA work?
A Cash ISA works in a similar way to a savings account, allowing you to deposit cash savings and earn interest over time. The interest earned is currently protected from UK income tax, which is one of the key differences compared to standard savings accounts.
The amount you earn will depend on the interest rates offered by the provider, and the type of account you have. Some accounts, like fixed rate Cash ISAs, require you to lock your money away for a set period, while other accounts offer instant access or come with more flexibility.
There is an allowance which determines how much you can deposit into all your ISAs combined in a given tax year. This allowance is currently set at a total of £20,000 for the 2026/27 tax year across all your ISAs, including Cash ISAs.
You can currently use your entire £20,000 allowance on your Cash ISA if you choose, but there is a plan to limit the Cash ISA portion of the overall allowance to £12,000 from April 6 2027 for people under the age of 65. Tax treatment depends on individual circumstances and may be subject to change.
How does a Stocks and Shares ISA work?
A Stocks and Shares ISA allows you to invest money in the stock market. Your money can be used to buy a range of investments, like shares, funds, or bonds, with the aim of achieving potential gains over time.
Any potential income or growth generated within the account, including profits that might normally be subject to tax, is currently free from UK income tax and capital gains tax under current rules up to an annual limit.
The annual ISA allowance of £20,000 also applies to Stocks and Shares ISAs, so you can deposit a maximum of £20,000 into a Stocks and Shares ISA in a given tax year, though that would use up 100% of your combined ISA allowance for that year. As with Cash ISAs, tax treatment depends on individual circumstances and may be subject to change.
The value of the investments in a Stocks and Shares ISA can go down as well as up, and you may get back less than you invest. Returns are not guaranteed, and you may need to sell your investments before accessing your money.
Cash ISA advantages and disadvantages
Advantages
You can earn tax‑free interest (meaning free from UK income tax and capital gains tax, under current rules), which can help your savings grow without certain deductions. Tax treatment depends on individual circumstances and may change.
Eligible cash deposits are protected by the Financial Services Compensation Scheme (FSCS) up to £120,000 per authorised institution, subject to FSCS eligibility criteria and rules.
Cash ISAs are generally considered lower risk compared to Stocks and Shares ISAs, as your money isn’t exposed to stock market movements. This means the balance won’t fluctuate in value in the same way investments can, though cash savings can be impacted by inflation.
Disadvantages
Cash ISAs come with inflation risk - if the interest rate is lower than the inflation rate, inflation can reduce buying power of cash savings over time.
Returns in Cash ISAs are typically lower compared to the potential growth available from investing, which may limit how much your savings increase over longer periods.
With some accounts, like a fixed rate ISA, you may need to leave your money in place for a set period. Early access or withdrawing funds before the term ends may result in restrictions or reduced returns, depending on the provider’s terms.
Stocks and Shares ISA advantages and disadvantages
Advantages
A Stocks and Shares ISA allows your money to be invested across a range of assets, which might be managed by you or by professional fund managers. This can help spread risk and support long‑term growth potential, depending on how investments perform.
Investment ISAs offer a tax‑efficient way to save or invest, as any income or growth will be protected from UK income tax and capital gains tax.
Any potential gains can remain invested within the ISA, meaning your money may benefit from compound growth over time. Returns are not guaranteed and you could get back less than you invest.
Stocks and Shares ISAs are often considered more suited to longer‑term investing. Investing can offer higher potential gains than Cash ISAs over the longer term, particularly as investments have more time to grow.
Disadvantages
As your money is invested, gains or losses will depend on market performance, and there is no guarantee that you will get back the amount originally invested.
Keep in mind stock market investments can go down as well as up, and you could get back less than you've invested, especially over shorter periods
Returns are not guaranteed, and the performance of your investments will depend on market conditions and the choices made, which can affect the overall outcome over time.
Can you hold a Cash ISA and a Stocks & Shares ISA in the same tax year?
Yes, you can contribute to both a Cash ISA and a Stocks & Shares ISA in the same tax year, as long as your total contributions do not exceed the £20,000 annual limit.
The annual ISA allowance is set by the UK Government and applies across all your ISAs combined, not per account. How you choose to split this will depend on your individual circumstances.
For example, you might choose to hold some savings in cash while investing the remainder in a Stocks and Shares ISA, provided the combined total stays within your annual allowance.
Both Cash and Stocks & Shares ISAs benefit from UK tax advantages under current rules, although tax treatment depends on individual circumstances and may change. ISAs don’t need to be opened via the same provider, so you can hold accounts with different companies.
The ISA allowance resets every tax year and you can't carry over uninvested cash into the next tax year. If you don't use your total allowance, you lose it.
Can you transfer a Cash ISA to a Stocks and Shares ISA?
Yes, it’s usually possible to transfer a Cash ISA into a Stocks and Shares ISA, though you need to use the provider's official ISA transfer process to preserve the ISA's tax advantages. One of the key benefits of using the transfer process is that money built up in previous tax years can normally be moved without counting towards your current tax-year ISA allowance.
To keep these benefits, you'll need to open an account with your preferred new provider and complete their ISA transfer form. The new provider will then handle the transfer on your behalf. This means you can move some or all of your ISA savings into investments without losing their tax-efficient status.
For example, if you have £40,000 built up in ISAs from previous tax years, you can normally transfer that money to a Stocks and Shares ISA without affecting your current ISA allowance, which will be £20,000 for the 2026/27 tax year. This means you could transfer the £40,000 and still have your full £20,000 allowance available to save or invest new funds during the same tax year.
It's important to note that withdrawing money from one ISA and paying it into another yourself could result in the money losing its ISA protection and may use up part of your current ISA allowance again. This is why using the official ISA transfer process is generally recommended. Tax treatment depends on individual circumstances and may change.
Transfer an ISA to Scottish Friendly
Are there other types of ISA available?
Alongside Cash ISAs and Stocks & Shares ISAs, there are other ISA types designed to support different financial goals and circumstances. Each option works differently, with features geared towards different ways of saving or investing.
Junior ISA
A Junior ISA is a long‑term account available for children under 18. It allows savings or investments to grow in a tax‑efficient way, with no UK income tax on interest earned or capital gains tax on investment growth.
Only a parent or legal guardian with parental responsibility can open a Junior ISA for a child under 16. Children aged 16 or 17 can open their own Junior ISA. Contributions can be made as a lump sum or in regular payments, depending on your circumstances.
It's worth noting that a Junior ISA is not an easy-access account. The funds belong to the child, are held in their name and can only be accessed by them when they turn 18. Some providers will allow children from age 16 to manage their account.
Scottish Friendly is an award-winning Stocks and Shares Junior ISA provider. Investment Life & Pensions Moneyfacts Awards 'Best Junior ISA provider' 2019-2025.
Lifetime ISA
A Lifetime ISA (LISA) is designed to help individuals save or invest towards a first home or later life. You can contribute up to £4,000 each year, and the government adds a 25% bonus, up to a maximum of £1,000 per year.
The account is designed to support long-term growth, but withdrawals for reasons outside the rules (i.e. buying a first home or helping towards retirement) will usually result in a government withdrawal charge. Eligibility and features depend on individual circumstances.
Scottish Friendly does not offer a Lifetime ISA.
Innovative Finance ISA
An Innovative Finance ISA allows you to invest your money through peer‑to‑peer lending. Instead of holding cash or traditional investments, your money is lent to individuals or businesses, and any potential returns typically come from interest payments made by those borrowers.
These investments can involve higher risk. Your capital is not guaranteed, returns depend on borrowers repaying their loans, and you could get back less than you invest, including the risk of losing all your capital.
Innovative Finance ISAs are usually considered better suited to more experienced investors.
Scottish Friendly does not offer an Innovative Finance ISA.
I want to start investing or saving - which ISA is right for me?
Both Cash ISAs and Stocks & Shares ISAs offer you a way to build up your savings tax-efficiently, and they each come with their own potential benefits and drawbacks. A Cash ISA is a savings account that pays interest, while a Stocks and Shares ISA allows you to invest your money in various assets with the chance of growth over time.
Cash ISAs are usually viewed as lower risk, though they can be outpaced by inflation. Stocks and Shares ISAs typically offer more growth potential over time, but you should expect fluctuations in value and you could get back less than you’ve paid in.
Investing in a Stocks and Shares ISA is generally recommended for money that you won't need to access for several years, while a Cash ISA is better suited for short-to-medium term savings.
As always, choosing between different ISA types ultimately depends on your risk tolerance, your attitude towards potential gains, and your specific financial circumstances.
Some key takeaways
Cash ISAs earn interest and are generally lower risk, while Stocks and Shares ISAs invest your money and can rise or fall in value.
Both offer tax‑efficient growth under current rules, but returns from investments are not guaranteed.
Cash ISAs may suit short‑term goals or easier access, while Stocks and Shares ISAs are often used for longer‑term investing.
You can hold and contribute to both in the same tax year, within the £20,000 ISA allowance.
The right choice depends on your risk tolerance, time horizon, and need for access to your money.
Important information
The value of stock market investments can go down as well as up, so you or your child could get back less than you’ve paid in.
The funds paid into a Junior ISA belong to the child and can only be accessed by them when they turn 18.
Tax-Free means the investment grows free from tax, with the exception of any tax your provider has already paid on your behalf (for example on dividends from UK shares). Tax treatment depends on individual circumstances and may be subject to change in the future.
This information is for general guidance only and does not constitute personal financial advice.
Scottish Friendly does not provide financial advice. If you’re unsure whether an ISA or Junior ISA is suitable for your situation, you may want to speak to an independent financial adviser.