Cash ISA - Instant access Tax-Free savings | NatWest

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Cash ISA

Give your savings a tax-free lift with your £20,000 ISA allowance

You can open the account with just £1

Your interest is tax-free

Take your money out whenever you like


Please read the Summary Box below before applying

Apply online Jump to Summary Box

Make the most of your tax-free savings

You can start saving with as little as £1, and take your money out when you need it

You can bring your ISA balances together in one place, by completing a transfer in request

You can save up to £20,000 in the 2018/2019 tax year up to 5th April 2018.

There are several ISA options available: Help to Buy: ISA, Fixed Term ISAs and a Stocks & Shares ISA through Natwest Invest. See all your ISA options here

Summary Box

Account Name: Cash ISA

1. What is the interest rate?

Balance Tax-free p.a./AER (variable)
£1 - £9,999 0.20%
£10,000 - £24,999 0.35%
£25,000 - £49,999 0.60%
£50,000+ 0.85%


Interest is paid on a tiered basis which 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.

2. Can NatWest change the interest rate?

Yes, these rates are variable.

They may be changed for any of the reasons set out in Term 9.2 of the Savings Account Terms (PDF, 605KB), e.g. to take account of Bank of England base rate changes or changes in the rates paid by other banks. 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. Term 9.2 also contains details of the notice we’ll give you.

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

Initial deposit at account opening Balance after 12 months Interest earned
£1,000.00 £1,002.00 £2.00
£10,000.00 £10,035.06 £35.06
£25,000.00 £25,150.41 £150.41
£50,000.00 £50,426.66 £426.66


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.

4. How do I open and manage my account?


You must be aged 16 years or over and be resident in the UK for tax purposes.

You must:

  • not have subscribed to another cash ISA (including a Help to Buy: ISA with another provider) or have subscribed more than the overall subscription limit in total to a cash ISA, a stocks and shares ISA, an innovative finance ISA and a lifetime ISA in the same tax year
  • hold the account solely in your name

If you already have a current account with us you can open your account on our mobile app, online, in branch or by telephone.

If you don't have a current account with us you can open your account online or on our mobile app (you need to register for online banking before you can get our mobile app). 

We will need your email address and mobile number to open your account. 

You can manage your account on our mobile app, online, in branch or by telephone.

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 tax year 2018/2019 it is £20,000. 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 except for a NatWest Help to Buy: 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.

5. Can I withdraw money?

Yes. No notice is required.

  • You can withdraw money: in branch or by transfer to any other account based in the UK (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 you can transfer from your account online, by telephone or on the mobile app.

The current daily limits and how to withdraw more than them can be found here or by contacting Telephone Banking.

6. Additional information?


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


AER (Annual Equivalent Rate):

This is a notional rate used for interest bearing accounts, which illustrates the interest rate if paid and compounded each year. It helps you to compare the effective rates of credit interest on different accounts.


Per annum (per year).


Interest which is exempt from UK income tax.

Ready to open a Cash ISA?
Apply online
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