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Make each day count.

Explore our tax-free cash ISAs

Make the most of this year's £20,000 ISA allowance

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.

Discover our cash ISAs

Cash ISAs are a simple, tax-free way to save. That means that you won't pay tax on any interest that you earn, so it could make your money work harder than a traditional savings account.

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Fixed Rate ISA

Minimum deposit £1000

Fixed interest rate so you know how much interest you'll get paid

Save a lump sum for 1 or 2 years

Take advantage of your £20,000 tax-free ISA allowance

Interest paid annually

 

One and two year Fixed Rate ISA rates

  • Fix for one year and earn 3.80% AER/tax free p.a. (fixed)
  • Fix for two years and earn 3.60% AER/tax free p.a. (fixed)
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Instant access Cash ISA

Start saving with £1

Instant access to your savings and tax-free benefits

Pay money in as you go

Take advantage of your £20,000 tax-free ISA allowance

Get paid interest monthly direct into your account

 

Cash ISA interest rates

  • For balances up to £24,999 - earn 1.15% / 1.14% AER/tax-free p.a. (variable)
  • For balances over £25,000 - earn 2.45% / 2.42% AER/tax-free p.a. (variable)

 

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For Fixed Rate ISA no withdrawals or deposits during the term. Available to new customers until 5pm on 14 January 2026. Available to existing customers until 19 January 2026. Please note that these issues may be withdrawn early due to limited availability. Interest is calculated daily and paid annually to your ISA on the first business day in April and on the Maturity Payment Date. Early closure fees may apply.

Transferring from an existing ISA

People tend to switch ISAs to take advantage of competitive rates, benefit from a different type of ISA or to bring all their ISAs together in one place. 

It's really important to go through a proper ISA transfer process. That way, you won't lose out on any of the tax benefits of your ISA and your tax-free allowance is protected.

You can use the Mobile App or Online Banking to transfer an existing ISA elsewhere into your NatWest instant access Cash ISA at any time, bringing all your ISAs together in once place.

If you're looking to open a new Fixed Rate ISA you can also complete an ISA transfer to bring all your ISAs together into the new account. 

If you want to transfer your ISA balance that has been paid in during the current tax year (since 6th April 2025), you must transfer this balance in full. For balances paid in during previous years you can choose to send a partial transfer and this won't count towards this year's ISA allowance.

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ISAs explained

Looking to understand more about Individual Savings Accounts (ISAs)? You're not alone. Our NatWest Savings Index has found that 33% of us don't know the ISA limit and 17% don't feel we understand ISAs.

With that in mind we've put together a video explaining how ISAs works and how to take advantage of your £20,000 annual ISA allowance.

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Your essential guide to ISAs

We're here to help you understand the details on ISA benefits, your ISA allowance and more, including ways to manage your ISA.

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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.

Financial Services Compensation Scheme

Your eligible deposits held by a UK establishment of NatWest are protected up to a total of £85,000, by the Financial Services Compensation Scheme, the UK's deposit guarantee scheme. Any deposits you hold above the limit are unlikely to be covered.

Find out more (PDF, 3k KB) about the scheme and how it protects your money.

Investments through NatWest Invest may also be covered by the Financial Services Compensation Scheme in some scenarios. You can find out more here.