What is an Individual Savings Account (ISA)?

Gert Svaiko

If you’re thinking of opening a savings account, you’re likely to come across ISAs.

These are a common type of savings account in the UK. But what is an ISA and how does it work?

In this handy guide, we’ll run through everything you need to know about ISAs. This includes types of ISA, how to open one, and the limits for deposits and withdrawals.

We’ll also show you a smart, alternative way to make your money work harder. With Wise Interest**, you can help your money grow by investing in a fund that holds government-guaranteed assets - all within your Wise account from the money services provider Wise. It’s not a bank account but offers some similar features, and your money is safeguarded.

Learn more about Wise Interest

Capital at risk. Growth not guaranteed.

What is an Individual Savings Account (ISA)?

ISA stands for Individual Savings Account. It’s a type of savings account which lets you earn tax-free interest. With other types of savings accounts, you’ll pay tax on any interest you earn over your personal savings allowance.

There are a few different types of ISAs available in the UK. These are cash ISAs, stocks & shares ISAs, lifetime ISAs and innovative finance ISAs. We’ll look at each of these in more detail shortly.

Many providers offer ISAs, such as Santander, Halifax, Nationwide and Virgin Money to name just a few high street banks which list ISAs among their savings account ranges.

How does an ISA work?

There are a few differences between an ISA and a standard savings account. For starters, you can only save a maximum of £20,000 (your ISA allowance) in a cash ISA.¹

You can have multiple ISAs, although you can only open one of each type per tax year.¹ But the amount you can deposit will need to be spread between them, up to your maximum ISA allowance. So for example, you can have £10,000 in a stocks & shares ISA and £10,000 in a cash ISA.

Depending on the account type, whether it’s fixed or easy access, you may be able to withdraw your money and make multiple deposits. For some ISAs though, you can only deposit once and will only be able to access your money once the fixed term is over.

But like other types of savings accounts, ISAs pay interest on your money.

What is an e-ISA?

Similar to an e-savings account, an e-ISA is an account that is wholly managed online (or via a mobile app). It’s a popular choice with people who prefer to do their banking via internet or mobile banking.

The 4 types of Individual Savings Accounts (ISAs)

There are four main types of ISAs available in the UK. Let’s find out a little more about each in turn.

Cash ISAs

A cash ISA is the most similar to a standard savings account, but offering tax-free interest on your money. There are a few different kinds of cash ISA, including instant access, limited access and fixed rate. Some can be opened with as little as £1.

Stocks and shares ISAs

This kind of ISA is for investments, where you don’t pay tax on returns. It can be thought of as a kind of wrapper, which sits around a portfolio of investments.

These may include:²

  • Individual stocks and shares
  • Exchange-traded funds
  • Government bonds
  • Unit and investment trusts.

The ISA provider may offer fund options based on your preferred level of involvement and risk.

Innovative finance ISAs

Known as an IFISA, this kind of ISA helps you earn tax-free interest on peer-to-peer lending. This is where investors are matched up to borrowers.³

Lifetime ISAs

A lifetime ISA (LISA) is a longer-term savings product. It can be used for two distinct purposes - either buying your first home (replacing the now-defunct Help to Buy ISA), or saving for retirement.⁴

This kind of savings account works a little differently to a normal ISA. You’ll be able to deposit a maximum of £4,000 per tax year, which counts towards your £20,000 annual ISA limit. But you’ll also get a 25% bonus from the UK Government (maximum of £1,000 per tax year).⁴

Your LISA will earn tax-free interest too. However, you can only withdraw money when you buy your first home or turn 60 years old, depending on what you’re using the account for.⁴

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What do you need to open an ISA?

To open an ISA in the UK, you’ll usually need to provide the following:

  • Your contact details and address
  • Your National Insurance (NI) number
  • Your bank account details for deposits and withdrawals
  • Details of any current ISAs if you want to transfer in.

Who can open an ISA?

Although it depends on the provider’s terms and conditions, you should be able to open a cash ISA as long as you’re a UK resident (for tax purposes) over the age of 16. For other types of ISA, you’ll need to be over 18 years old.¹

How much can you put in an ISA?

Each year, the UK Government sets an annual ISA limit - this is the maximum you can save in an ISA during the tax year. For 2023-2024, the limit is £20,000

What are the limits for withdrawals with ISAs?

This can vary between ISA providers, so you’ll need to check with the bank or building society to see how much you can withdraw at once.

💡 Did you know that you can earn a return with Wise Interest?
Your money doesn’t have to sit still. With Wise Interest**, you can earn a return of up to 3.99% on your GBP balance, all within your Wise account.

Here’s how it works:

  • Have a balance in GBP, USD or EUR
  • Switch on Wise Interest
  • Your money is put to work by investing in a fund that holds government-guaranteed assets
  • Returns are added to your money every working day
  • Withdraw up to 10,000 GBP (or equivalent) a day (any amount over will add a processing time of up to 2 working days)
  • Start from as little as £1

Unlike some savings and current accounts, Wise Interest lets your money grow while staying accessible. Just keep in mind that, like any investment, growth isn’t guaranteed, and your capital may be at risk.

Learn more about Wise Interest

Capital at risk - past performance does not guarantee future growth. Variable rate is based on 7 day performance as of 12/02/2025. This fund has returned an 1.31% annual average over the last 5 years, excluding Wise fees. For the full 5 year past performance of funds, please visit our website.

FAQ on Individual Savings Accounts (ISAs)

How many ISAs can I have?

You can have as many ISAs as you like, but you’ll only be able to open one of each type per tax year.

Is an ISA better than a savings account?

It all depends on your circumstances. If you think you’ll exceed your personal savings allowance during the tax year and want to avoid being taxed on the interest you earn, an ISA could be the better choice.

Is money safe in an ISA?

Yes, as long as the bank, building society or other provider is covered by the Financial Services Compensation Scheme (FSCS). This offers protection of up to £85,000 per person just in case the provider goes under.

**Capital at risk. In the UK, Interest and Stocks are provided by Wise Assets — this is the trading name of Wise Assets UK Ltd, a subsidiary of Wise. Wise Assets UK Ltd is authorised as an investment firm and regulated by the Financial Conduct Authority (FCA). Our FCA number is 839689. We do not give investment advice, and you may be subject to pay tax. If you're not sure, seek qualified advice. You can find more information about the funds on our website.


Sources used:

  1. GOV.UK - Individual Savings Accounts
  2. Money Helper - Stocks and Shares ISAs
  3. Which - Innovative Finance ISAs explained
  4. GOV.UK - Lifetime ISA

Sources last checked on date: 12-Sep-2023

Capital at risk. Growth not guaranteed. Wise Assets UK Ltd is authorised and regulated by the Financial Conduct Authority with registration number 839689. When facilitating access to Wise investment products, Wise Payments Ltd acts as an Introducer Appointed Representative of Wise Assets UK Ltd. Please be aware that we do not offer investment advice, and you may be liable for taxes on any earnings. If you’re uncertain, we urge you to seek professional advice. To find out more about the Funds, visit our website.


*Please see terms of use and product availability for your region or visit Wise fees and pricing for the most up to date pricing and fee information.

This publication is provided for general information purposes and does not constitute legal, tax or other professional advice from Wise Payments Limited or its subsidiaries and its affiliates, and it is not intended as a substitute for obtaining advice from a financial advisor or any other professional.

We make no representations, warranties or guarantees, whether expressed or implied, that the content in the publication is accurate, complete or up to date.

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