Earn a market-leading 5.71%* AER (variable) with the Moneybox Cash ISA

  • Underlying rate of 4.20% AER (variable) with a 1.51% fixed 3 month bonus
  • Save £20,000 a year with tax-free interest
  • Minimum balance £500
  • Up to 3 withdrawals every 12 months without impacting your rate

Open or transfer an account in minutes and join over one million people saving with Moneybox.

Tax treatment depends on individual circumstances and may be subject to change in the future. *New customer rate as of 11/04/2025. Subject to conditions, includes bonus rate of 1.51% for first 3 months.

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What is a Cash ISA?

A Cash ISA is an individual savings account that you can use to earn interest on your money. You can save up to £20,000 into a Cash ISA each tax year, and the interest you earn is completely tax-free.

With the Moneybox Cash ISA, you’ll earn a market-leading 5.71%* AER (variable) on balances of £500 or more, which includes a bonus rate of 1.51% for your first 3 months.

A lower interest rate of 0.75% AER (variable) applies whenever your account balance is less than £500. It also applies for the rest of your current 12-month period from your fourth withdrawal. The number of withdrawals you can make without impacting your rate will reset each year on the date you opened your Cash ISA.

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How to open a Cash ISA

You can open a Cash ISA in minutes with Moneybox. Simply sign up, login via the website or download the app, and deposit a minimum of £500 to get started.

Plus, you can easily transfer in any ISAs you hold with other providers into a Moneybox Cash ISA, with no paper forms.

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Grow your long-term savings

Save in a way that works for you with weekly, payday, and one-off deposits, completely tax-free.

Maximise your ISA allowance

Achieve your financial goals and make the most of your £20,000 ISA allowance each tax year.

Transfer an ISA in from elsewhere

Transfer any ISAs you hold with other providers into a Moneybox Cash ISA.

Join over 1 million people building wealth with Moneybox

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Choose a Cash ISA that suits your needs

Whether you’re looking for a top-paying Cash ISA rate, or would prefer unlimited withdrawals, we’ve got the account for you.


Compare Moneybox Cash ISAs

Account name
Cash ISA
Open Access Cash ISA
Withdrawal restrictions
3 withdrawals annually without impacting your rate
Unlimited withdrawals no restrictions
Total interest rate
5.71% AER (variable) includes 3 month bonus rate
4.82% AER (variable) includes 12 month bonus rate
Bonus rate
1.51% AER (variable) for the first 3 months
0.82% AER (variable) for the first 12 months
Minimum balance
£500 to keep rate
£500 to keep rate
Interest payments
Yes paid monthly
Yes paid yearly
Cash ISA
Withdrawal restrictions
3 withdrawals annually without impacting your rate
Total interest rate
5.71% AER (variable) includes 3 month bonus rate
Bonus rate
1.51% AER (variable) for the first 3 months
Minimum balance
£500 to keep rate
Interest payments
Yes paid monthly
Open Access Cash ISA
Withdrawal restrictions
Unlimited withdrawals no restrictions
Total interest rate
4.82% AER (variable) includes 12 month bonus rate
Bonus rate
0.82% AER (variable) for the first 12 months
Minimum balance
£500 to keep rate
Interest payments
Yes paid yearly

Everything you
need to know

Moneybox Cash ISA

Higher Interest Rate (including a bonus interest rate of 1.51% AER for 3 months): 5.71% AER (variable)

  • if you make less than four withdrawals within each 12 month period from the date of opening your Cash ISA; and
  •  maintain a balance of £500 or more.

Higher Interest Rate (after 3 months): 4.20% AER (variable)

  • if you make less than four withdrawals within each 12 month period from the date of opening your Cash ISA; and
  • maintain a balance of £500 or more.

Lower Interest Rate: 0.75% AER (variable)

  • if you make four or more withdrawals within each 12 month period from the date of opening your Cash ISA; or
    if your balance is below £500, the lower interest rate will be applied for as long as your balance remains below £500

Interest is earned daily on cleared balances and is rounded down to the nearest penny.

Interest accrued due to the underlying interest rate is paid monthly on the first day of the month, unless otherwise stated.

The bonus interest rate will be applied for 3 months from the date you open your Moneybox Cash ISA.

The bonus interest will be calculated daily and paid on the first day of each month into your Moneybox Cash ISA as interest

  • Yes – the underlying interest rate is variable, so it can go up or down.
  • We will inform you as soon as possible of any change to the interest rate.
  • Your interest rate will also change to the lower interest rate exclusive of any bonus interest rate if:
    • your Cash ISA balance is below £500; or
    • you make four or more withdrawals from your Cash ISA account within each 12 month period from the date of opening your Cash ISA. You’ll receive the lower rate exclusive of any bonus interest rate for the rest of that period after you’ve made four or more withdrawals.

Estimated balance after 12 months (higher interest rate of 5.71% including 1.51% bonus interest rate for 3 months) and then higher interest rate of 4.20% applying for the subsequent 9 months: £1045.74

This assumes that:

  • The account is opened with £1,000 deposit.
  • No further deposits or withdrawals are made.
  • The interest rate(s) stays the same for the full 12 months.

Estimated balance after 12 months (lower interest rate of 0.75%): £967.33

This assumes that:

  • The account is opened with £1,000 deposit, initially accruing interest at the higher rate.
  • Four subsequent withdrawals of £10 are made on the second day of opening the account, triggering the lower rate of interest.

Estimated balance after 24 months (higher interest rate of 5.71% including 1.51% bonus interest rate for 3 months) and then higher interest rate of 4.20% applying for the subsequent 21 months: £1089.66

This assumes that:

  • The account is opened with a £1,000 deposit.
  • No further deposits or withdrawals are made.
  • The higher interest rate stays the same for the full 24 months.

Estimated balance after 24 months (lower interest rate of 0.75%): £974.58

This assumes that:

  • The account is opened with £1,000 deposit, initially accruing interest at the higher rate.
  • Four subsequent withdrawals of £10 are made on the second day of opening the account, triggering the lower rate of interest.
  • The account is available to UK residents aged 18 or over.
  • You may only open and manage the account via the Moneybox app.
  • Your Cash ISA account opening date will be the date you open your product.
  • You can transfer in existing ISAs or make contributions up to £20,000 in total each tax year.
  • Joint accounts are not allowed.
  • You can withdraw from your Cash ISA at any time to your linked UK bank account in your name.
  • You can either withdraw the full balance held in your Cash ISA or withdraw part of the balance.
  • Please note that if you make four or more withdrawals within each 12 month period from the date of opening your Cash ISA, this will impact the interest applicable to your account. You’ll receive the lower rate exclusive of any bonus interest rate for the rest of that period after you’ve made four or more withdrawals. The number of withdrawals you can make without impacting your rate will reset yearly on the date you opened your account
  • The ISA is a government savings scheme and the rules, including tax benefits, could change in the future.
  • Interest is paid tax-free. This means that you do not pay income tax on the interest earned in the Cash ISA.

Moneybox guide to Cash ISAs

It's important you know

*5.71% AER (variable) includes a bonus rate of 1.51% for the first 3 months. A lower rate of 0.75% AER (variable) applies if account conditions aren’t met.

Interest is accrued daily and paid into your account on the first day of each month. The rate is variable, and we’ll inform you if it changes.

Tax treatment depends on individual circumstances and may be subject to change in the future.

It's important you know

Capital at risk. All investing should be for the longer term. The value of your investments can go up and down, and you may get back less than you invest. Tax treatment depends on individual circumstances and may be subject to change in the future.

A 25% government penalty applies if you withdraw money from a Lifetime ISA for any reason other than buying your first home (up to £450,000) or for retirement, and you may get back less than you paid into your Lifetime ISA.

Your home may be repossessed if you do not keep up repayments on your mortgage.

Payments you make into your pension won’t be accessible until the minimum pension age (currently 55, increasing to age 57 from 2028). Tax treatment depends on individual circumstances and may be subject to change in the future.

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