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NatWest Cash ISAs

Make the most of your ISA allowance with our instant access Cash ISA

There's still time to open our cash ISA using this year's £20,000 tax-free allowance. Deadline 5pm on 02 April.

You must be a UK resident aged 18+. You can only subscribe to one Cash ISA with NatWest in any tax year up to £20,000. Tax free Interest means interest payable is exempt from UK income tax. Tax reliefs referred to are those applied under current UK legislation, which may change. New cash ISA accounts must be open and funded by 5pm on 02 April to count towards the 2025/26 ISA allowance. Money added to existing accounts after 11:59pm on 05 April will count towards the 2026/27 ISA allowance.

What is a Cash ISA and how does it work?

Our Cash ISA is a savings account that offers tax-free interest.

Pay money in as you go and get instant access to your savings.

Save up to £20,000 each year in a Cash ISA, without having to pay tax on the interest you earn.

Our Cash ISA already helps 1.9 million people (as of January 2026) to save towards their financial goals.

Transfer ISA balances from other providers after opening your new NatWest ISA. Learn how to transfer an ISA.

Get monthly interest payments into your account.

 

Summary Box

Account name: Cash ISA

What is the interest rate?

Balance

£1 - £24,999
£25,000+

AER (variable) / Tax-free p.a.

1.15% / 1.14%
2.45% / 2.42%
Interest is paid on a tiered basis. This means you'll earn one rate on your entire account balance. Interest is calculated daily and paid into your account on the first business day of the month and at account closure.

Can NatWest change the interest rate?

Yes, these rates are variable. If the rates are going down and your balance is £100 or more, we'll give you at least 14 days' notice. If the rates are going down and your balance is less than £100, we'll inform you before the change or shortly afterwards. If the rates are going up, we'll inform you before the change or shortly afterwards. For more information please see the Savings Account Terms (45 pages).

What would the estimated balance be after 12 months based on a range of deposits?

Initial deposit at account opening

£1,000.00
£25,000.00

Balance after 12 months

£1,011.46
£25,611.75

Interest earned

£11.46
£611.75
These are only examples and do not take into account your individual circumstances. They assume that no further deposits or withdrawals are made; there is no change to interest rates and tiers; and any interest earned stays in the account.

How do I open and manage my account?

Your eligibility

Cash ISAs are open to existing NatWest current account customers aged 18+. You must be resident in the UK for tax purposes.

You can only hold one Cash ISA with NatWest.

If you already have a Cash ISA with us, keep paying into that account.

You must:

  • Not have subscribed to another Cash ISA with us or have subscribed to more than the overall subscription limit in total to a Cash ISA, a Stocks & Shares ISA, an Innovative Finance ISA and or a Lifetime ISA in the same tax year.
  • Hold the account solely in your name.

You can open and manage your account on our mobile app, online or by telephone.

To open in branch you must bring your own digital device such as a mobile or tablet and our staff can assist you opening the account yourself.

Balance and ISA allowance

There is no minimum deposit required to open the account; no minimum deposit needs to be made on a regular basis; and there is no maximum balance limit.

However, there is a limit on the amount you can pay into your account each tax year (6 April to 5 April). This annual limit also known as your “ISA allowance”, is set by the Government and may change from time to time. For the current tax year it is £20,000 across all ISA products during the current tax year. If you pay in more than the limit any excess money will be returned to you.

If you make a payment for a tax year into your Cash ISA, you can’t make any payments for that tax year into any other cash ISA with us except for a NatWest Help to Buy ISA.

Paying into more than one ISA

Making payments to both a NatWest Cash ISA and a NatWest Help to Buy: ISA

You can make payments to a Help to Buy: ISA in the same tax year as a NatWest Cash ISA provided that:

The Help to Buy: ISA is held with us; and

You don't pay in more than the ISA allowance between the Cash ISA and the Help to Buy: ISA

You can transfer all or part of any ISA held with another provider to us. Click here to find out more. Open in new window

Can I withdraw money?

Yes. No notice is required.

This account is a non-payment account.

You can withdraw money: in branch or by transfer to another account held with us in your name (online, by telephone or on the mobile app).

If you make a withdrawal, you will not be able to deposit more money into your account if it means you will exceed the annual limit.

You can transfer your ISA (or part of it) to another ISA manager.

There are daily limits on the amount of money you can withdraw from your phone, online or on the mobile app. Find out more about the daily limit.

Additional information

The interest payable on the money held in your account is tax-free. The tax treatment may be subject to change in the future and depends on your individual circumstances.

Definitions

Annual Equivalent Rate (AER) shows the interest rate if interest is paid and compounded once each year. AER helps you to compare the rates of interest on different accounts.

Compound interest is interest that is earned on interest that’s already been paid.

Gross means the interest rate you are paid on your savings with no compounding.

p.a. per annum (per year).

Tax-free. We pay all savings interest without the deduction of tax. You do not pay any UK tax on interest earned in ISAs. You may have to pay tax on interest earned in non-ISA accounts depending on your Personal Savings Allowance. The tax treatment may be subject to change in the future.

Get ready to apply

Before you apply, we need to check you're happy with a few things. And ask you a few questions up front. Then we can make your application as quick and simple as it can be.

First things first. Please take a look at the important legal info:

If you carry on applying, it means you're happy with what's in these documents, including the FSCS information sheet. Please take some time to review, print and/or save the important information.

How your information might be used

It’s important for you to understand how we use and share your information. Please read this short summary before you continue with your application.

As part of the checks that we will complete to verify your identity, we’ll take an image of your face so that it can be compared with your photo ID and this biometric data is captured.

All okay? You're nearly ready to start.

Please take your time to read the summary box information and make sure this savings account is right for you.

Unsure? Compare our savings accounts

To speed up your application for our Cash ISA account, we need to do a few final checks with you. They'll only take a minute.

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Do you have our NatWest app on a mobile device?
If you're registered for our app on a mobile device, we can pre-fill some of your info, making the application process faster.
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Great, let's get your application started.

Remember, to apply for a Cash ISA, you must: 

  • Have your National Insurance number. You’ll find it on your payslip, P60 or any letters from HMRC.
  • Be at least 18 years old and a permanent UK resident, or a Crown Servant serving overseas, their spouse or civil partner.
  • Have a phone number and email address we can contact you on.

Using a desktop or have the app on another device?

Simply scan the QR code with your mobile or tablet device that has the NatWest app and we'll get you started.  

Can't scan the QR code?

Using your mobile or tablet device now?

If you're already using a device with the NatWest app, select the 'Start your application' button below.

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Do you use Online Banking?
If you log in to Online Banking we can pre-fill some of the application for you.
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Next

Log in to NatWest Online Banking

  1. Enter your customer number or 16-digit card number to get started. 
  2. You'll then need to enter your Online Banking pin and password.
  3. Once you're logged in, select 'Savings accounts' from the product list. 
  4. Finally, choose the account you want to apply for and complete your application.

Remember, to apply for a Cash ISA, you must: 

  • Have your National Insurance number. You’ll find it on your payslip, P60 or any letters from HMRC.
  • Be at least 18 years old and a permanent UK resident, or a Crown Servant serving overseas, their spouse or civil partner.
  • Have a phone number and email address we can contact you on.
Previous
Log in now

Let’s get you registered for Online Banking

You’ll need to sign up for Online Banking with us in order to apply for a savings account. The good news is that it normally takes only 5 minutes and all you’ll need is your sort code, account number and your NatWest Debit Card, if you have one.

Once you’ve registered, select ‘Next’ to log in and apply for a Cash ISA account. 

Previous
Next

Log in to NatWest Online Banking

  1. Enter your customer number or 16-digit card number to get started. 
  2. You'll then need to enter your Online Banking pin and password.
  3. Once you're logged in, select 'Savings accounts' from the product list. 
  4. Finally, choose the account you want to apply for and complete your application.
Previous
Log in now

Cash ISA - FAQs

Want to reach your savings goals quicker?

How to start saving

Ready to start saving and take control of your financial future? Check out our guide to discover the benefits of using a savings account, how to save regularly, and how your savings can earn you interest.

Check out our guide to saving

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