Earn 4.00% AER (variable) with the Moneybox Open Access Cash ISA
Save up to £20,000 each tax year
Enjoy unlimited withdrawals
Get tax-free interest
Start saving with £1
Open or transfer an account in minutes and join over 1.5 million people saving with Moneybox.
ISA and tax rules apply. Interest rate subject to conditions, includes 0.75% bonus rate for first 12 months, excludes transfers. New customer rate as of 27/05/2026
Save with tax-free interest
Earn 4.00% AER (variable) on balances of £1 or more, excluding transfers.
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 if account conditions are not met.
How to open a Open Access Cash ISA
You can open a Open Access Cash ISA in minutes with Moneybox. Simply sign up via the website or download the app, and start saving with £1.
Have an ISA elsewhere? Earn 3.25% on funds transferred into a Moneybox Cash ISA. There’s no paper forms and we handle it all from start to finish, so you don’t have to.
Build the savings you want
Grow your savings
Save in a way that works for you with weekly, monthly, and one-off deposits.
Maximise your ISA allowance
Achieve your financial goals and make the most of your £20,000 annual ISA allowance each tax year.
Transfer an ISA in from elsewhere
Start a transfer in minutes and bring an ISA you hold elsewhere into a Moneybox Cash ISA.
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Compare the Moneybox Cash ISAs
See which Cash ISA suits you.
| Open Access Cash ISA | Cash ISA |
|---|---|---|
Withdrawal restrictions | Unlimited withdrawals no restrictions | 3 withdrawals annually without impacting your rate |
Total interest rate | 4.00% AER (variable) includes 12 month bonus rate | 4.75% AER (variable) includes 12 month bonus rate |
Bonus rate | 0.75% AER (variable) for the first 12 months | 1.30% AER (variable) for the first 12 months |
Rate for transfers | 3.25% AER (variable) your underlying rate | 4.75% AER (variable) your underlying and bonus rate |
Minimum balance | £1 to keep rate | £500 to keep balance |
Interest payments | Yes paid monthly | Yes paid monthly |
Moneybox guide to Cash ISAs
Cash ISA top FAQs answered
The top Cash ISA FAQs you'll want to know.
Cash ISA vs Stocks & Shares ISA
Which is best for the goals you want to achieve?
Cash ISA vs savings accounts
Discover the unique benefits of each and decide which can help you.
What is a Cash ISA?
Here's everything you need to know about how a Cash ISA can help you.
Everything you need to know
What's the account name?
Open Access Cash ISA
What's the interest rate?
Introductory bonus rate of 0.75% AER (variable)
Underlying interest rate of 3.25% AER (variable)
You may receive an introductory bonus interest rate for a limited period from account opening. Where applicable:
This bonus interest rate is added to the underlying interest rate to produce a higher headline rate displayed in the app.
The bonus interest rate may apply:
to your entire balance; or
to eligible contributions (excluding ISA transfers from other providers, which will earn the underlying interest rate).
Bonus eligibility is determined when you open your Open Access Cash ISA account and is not applied retrospectively. Transfers from other ISA providers do not receive the bonus interest rate, unless Moneybox states otherwise. The bonus interest rate:
is fixed
may be withdrawn if conditions are not met
expires after 12 months from account opening
After expiry, all balances in your Cash ISA earn the underlying interest rate of 3.25% AER (variable)
Can Moneybox change the interest rate?
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 £1
What would the estimated balance be after 12 and 24 months based on a £1,000 deposit?
Estimated balance after 12 months: £1,040.00 (for introductory rate including bonus rate)
Estimated balance after 12 months: £1,032.50 (for underlying rate)
This assumes that:
The account is opened with £1,000 deposit
No further deposits or withdrawals are made.
The product interest rate(s) stays the same for the full 12 months.
How do I open and manage my account?
The account is available to UK residents aged 18 or over.
You may only open and manage the account via the Moneybox app or Moneybox website.
At Moneybox, we define your Open Access Cash ISA account opening date as 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.
Can I withdraw money from my Open Access Cash ISA?
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.
Additional information
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.
It's important you know
*4.00% AER (variable) includes a bonus rate of 0.75% for the first 12 months. You’ll earn the underlying rate of 3.25% on any transferred funds from another provider. 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. Introductory bonus interest is calculated daily and paid on the first day of each month. The underlying 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.