Earn 5.05% AER (variable) with the Moneybox Open Access Cash ISA

  • Save up to £20,000 each tax year
  • Enjoy unlimited withdrawals
  • Get tax-free interest
  • Minimum balance £500

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 customers rate as of 17/04/2025. Subject to conditions, includes bonus rate of 1.05% for first 12 months.

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What is a Cash ISA

A Cash ISA is a savings account with a tax wrapper, helping you to save without paying any tax on your earnings. Each tax year you can save up to £20,000, spread across any ISA account, and the interest you earn is completely tax free.

Open a Cash ISA

Save with tax-free interest

  • Earn 5.05% AER (variable) on balances of £500 or more.
  • Save up to £20,000 each tax year and build your wealth with tax-free interest.
  • Access your money whenever you need it and enjoy unlimited withdrawals.
  • A lower interest rate of 0.75% AER (variable) applies whenever your account balance is less than £500.
Start saving

How to open a Open Access 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 Open Access 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 bonus rate
5.05% AER (variable) includes bonus rate
Bonus rate
1.51% AER (variable) for the first 3 months
1.05% 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 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
5.05% AER (variable) includes bonus rate
Bonus rate
1.05% AER (variable) for the first 12 months
Minimum balance
£500 to keep rate
Interest payments
Yes paid yearly

Everything you
need to know

Open Access Cash ISA

Higher Interest Rate (including a bonus interest rate of 1.05% AER for 12 months): 5.05% AER (variable) if you maintain a balance of £500 or more.

Higher Interest Rate (after 12 months): 4.00% AER (variable) if you maintain a balance of £500 or more.

Lower Interest Rate: 0.75% AER (variable) if your balance is below £500, the lower interest rate will be applied for as long as your balance remains below £500

Interest is accrued daily. Interest accrued due to the underlying interest rate is paid annually on the product anniversary, rounded down to the nearest penny.

The bonus interest rate will be paid for 365 days (or 366 days in a leap year) from the day you open your first Open Access Cash ISA.

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 Open Access Cash ISA balance is below £500

Estimated balance after 12 months (higher interest rate of 5.05% inclusive of 1.05% bonus interest rate): £1,050.50

This assumes that:

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

Estimated balance after 12 months (lower interest rate of 0.75%): £493.80

This assumes that:

  • The account is opened with £1,000 deposit, initially accruing interest at the higher rate.
  • A subsequent withdrawal of £510.00 is made on the second day of opening the account, triggering the lower rate of interest.
  • Your interest rate will change to the lower interest rate exclusive of any bonus interest rate if your Open Access Cash ISA balance is below £500.
  • The account has unlimited withdrawals.

Estimated balance after 24 months (higher interest rate of 5.05% (including 1.05% bonus interest rate) applying for the first 12 months and then higher interest rate of 4.00% applying for the subsequent 12 months): £1,092.51

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%): £497.50

This assumes that:

  • The account is opened with a £1,000 deposit, initially accruing interest at the higher rate.
  • A subsequent withdrawal of £510.00 is made on the second day of opening the account, triggering the lower rate of interest and no further deposits or withdrawals are made.
  • Your interest rate will change to the lower interest rate exclusive of any bonus interest rate if your Open Access Cash ISA balance is below £500.
  • The account has unlimited withdrawals

The account is available to UK residents aged 18 or over.

You may open and manage the account via the Moneybox app or website.

Your Open Access 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 only have one Moneybox Cash ISA account open at this time.

You can withdraw from your Open Access Cash ISA at any time to your linked UK bank account in your name either as sole or joint account holder. You can either withdraw the full balance held in your Open Access Cash ISA or withdraw part of the balance.

The account has unlimited next-day withdrawals without impacting your rate.

This is not a flexible ISA, meaning any withdrawals you make will still count towards your annual ISA allowance and cannot be replaced in the same year.

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 Open Access Cash ISA.

Moneybox guide to Cash ISAs

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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The 2025/26 tax year has begun - your ISA allowances have now reset!Learn more