Could our 1 Year Fixed Rate ISA lift your savings with 4.00% AER/tax-free p.a. (fixed)?
2 Year Fixed Rate option available at alternative rates.
Why wait to save tax-free? Make each day count and start earning tax-free interest today.
Make the most of this year's £20,000 ISA allowance.
Choose to fix your savings interest rate for 1 year or 2 years so you know exactly what your pot will earn.
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.
Available until 31 July 2025 to new customers and 05 August 2025 to existing customers. Please note that these issues may be withdrawn early due to availability. Early closure charges may apply. Interest is calculated daily and paid annually.
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Our Fixed Rate cash ISA is a type of savings account that could give you:
What are NatWest's best 1 year Fixed Rate ISA and 2 year Fixed Rate ISA rates?
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.
A Fixed Rate ISA is a savings account where you agree to lock your money away for a certain period. These ISA accounts offer fixed rates in return.
Unlike instant-access ISAs, you won’t be able to touch your money until the fixed term ends. But, the interest rate will often be higher.
Fixed Rate ISAs also offer tax benefits compared to traditional savings accounts. Any interest you earn is tax-free, as long as you stick to the £20,000 annual allowance.
Whether you are a new customer or have an existing account with us already, it's simple to apply for a Fixed Rate cash ISA. Just click 'Apply online' below to get started. You’ll need to read a few T&Cs before you begin.
You can save up to £20,000 and earn tax-free interest for terms of one or two years. Simply choose the fixed ISA term and interest rate that’s right for you.
After you’ve opened your account, you’ll need to add at least £1,000 before the Start Date of your ISA. You can add any savings or transfer another allowance into your account with our ISA transfer form.
Working out the best account for you? A Fixed Rate ISA and instant-access ISA offer different options.
Access to your money
Whether it’s a one-year Fixed Rate ISA or for two years, you’ll need to leave your money untouched for a set period. In contrast, an instant-access account means you can dip in whenever you need to.
ISA interest rates
When you compare Fixed Rate ISAs and instant-access accounts, you may find higher rates on the former. This is often the trade-off for locking your money away.
Making regular deposits
With a Fixed Rate cash ISA, you can’t pay extra money in after the start date. An instant-access account is more flexible, as you can regularly pay cash in as you go.
You’ll need to follow a few rules to get the full benefits of a Fixed Rate ISA. These are:
You can currently save up to £20,000 across your ISAs each tax year. This is known as the annual ISA allowance.
You can choose to save your full allowance in just one account, such as a Fixed Rate ISA. Or you could split it across different ISA types. Between a cash ISA and a stocks and shares ISA, for instance.
You won’t be able to make further payments into any other Cash ISA with us during the current tax year. The only exception is an existing NatWest Help to Buy: ISA. You can pay into an existing Help to Buy: ISA in the same tax year so long as the Help to Buy: ISA is held with us and you don’t pay in more than the annual allowance between the Fixed Rate ISA and Help to Buy: ISA.
Whether you are a new or existing customer, you can still open a Fixed Rate ISA with us. T&Cs apply.
As you're a new customer, we'll need to check your ID before opening your fixed ISA.
We'll do this by matching your photo ID to a selfie of you. You’ll need a device with a camera to upload these. We may also ask for other ID like proof of address. If you don’t have your ID to hand, you can finish this step later.
31 July 2025 by 5pm
As a new customer, this is the last day you can apply and to make any external ISA transfers.
05 August 2025
It’s important we receive the requested information by this date. If we don’t, we’ll be unable to open your account. You'll still be able to apply for our next offer so check back with us on 06 August 2025.
Please ensure you read the summary box below before applying.
If you already have a current account, credit card, loan or a savings account with us and want to open a Fixed Rate ISA, select apply to begin your application.
Please ensure you read the summary box below before applying.
No, the interest rate is fixed. This means that the rate will not change between the date you open your account and the Maturity Date.
There are a few requirements when opening a NatWest Fixed Rate ISA. First, you’ll need to:
Keep in mind: 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.
To open Fixed Rate ISAs, we’ll need your email address and mobile number. You can get started:
Up and running? You can manage your Fixed Rate ISA using our app, online or by phone.
Payments can be made using our app, online, in branch or by telephone by setting up your Fixed Rate ISA as a new payee using the account number and sort code.
We’ll send you a certificate of deposit within 14 days of the account start date.
Just remember that:
You won’t be able to make further payments into any other Cash ISA with us during the current tax year.
The only exception is a NatWest Help to Buy: ISA. You can pay into a Help to Buy: ISA in the same tax year so long as:
You can transfer an ISA by visiting our ISA transfer page.
You can withdraw money from your account (in branch or by telephone) until 19 August 2025 at 3:30pm. Partial withdrawals aren’t permitted after that.
If you want to access your money after this cut-off but before the maturity date, you’ll need to ask us to close your Fixed Rate ISA. When your Fixed Rate ISA is closed, we’ll convert it into a Cash ISA and then you can access your funds. We’ll charge an Early Closure Charge for doing this.
The Early Closure Charge will:
The total amount you receive (including interest earned on your balance) will be no less than your deposit at the start date. For example, if you’ve earned 50 days’ interest, you will only pay an Early Closure Charge equivalent to 50 days’ interest. And if you’ve earned 100 days’ interest, you will only face a charge equivalent to 90 days’ interest.
For more details, take a look at our Fixed Rate ISA Terms (PDF 268 KB) (Term 8).
If you transfer your account to another manager before the maturity date, we’ll convert it to a NatWest Cash ISA. An Early Closure Charge will then apply.
If you want to transfer your ISA without facing an Early Closure Charge, the transfer must be dated at least the day after the maturity date, when your money becomes accessible.
When your ISA with a fixed rate reaches its maturity date, we’ll convert it to a NatWest Cash ISA. If the maturity date isn’t a business day, we’ll do this on the next business day. You can then access the money in your Fixed Term ISA on the maturity payment date.
Take a look at Term 5 of the Fixed Rate ISA Terms (PDF 268 KB) for more information.
Once your 1 year or 2 year Fixed Rate ISA reaches the end of its term, we’ll automatically change it into an instant access Cash ISA. You then have a few options available including:
The interest paid on your fixed ISA savings is tax-free. Just remember that this tax treatment may be subject to change in the future. And it depends on your individual circumstances.
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.
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.
This Information Sheet sets out the key information you need to know about the Fixed Rate ISA, including interest rates and balance examples.
Download PDF (1.6MB) (for tax year 25/26)
All kinds of general info about our savings accounts. Including details about the Fixed Rate ISA.
Very important information about how your money is protected. Just in case.
Key information about our Cash ISA products, in a short and snappy two page summary.
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.
Fixed Rate ISAs and savings accounts can be a great choice for some people. If you’re willing to save for the medium to long term and have a lump sum available that you won’t need to dip into, these types of account could help your savings earn more interest.
But it might be worth exploring NatWest's other savings accounts if you want instant access to your money, or if you prefer regular saving over putting a lump sum away.
Also keep in mind that what’s considered as the ‘best’ Fixed Rate ISA may differ from person to person. So it’s helpful to compare accounts and shop around.
To make your initial payment into your Fixed Rate ISA, you’ll need to set up the account as a new payee, using the account number and sort code, via online banking or mobile banking.
Your next payments can be made through online banking, in-branch and by telephone. Please see the last day to make payments in the 'Key Dates' section above.
We will send you a certificate of deposit within 14 days of the Start Date.
With a Fixed Rate ISA, you'll typically get a better rate of interest but won’t be able to withdraw your savings unless you close your Fixed Rate ISA, at which point we will convert it to an instant access Cash ISA, or you transfer your Fixed Rate ISA balance before the maturity date.
If you do this before the fixed term ends, a fee will be charged of 90 days’ interest on the balance of your account.
You can get additional support with Banking My Way. This is a free service that allows you to record information about the support or adjustments you need to make banking easier.
You can also let us know about any additional support you may need to ensure all our colleagues are aware. The information will be shared on our internal systems, so you will not need to repeat these requirements every time you interact with us.
Once your Fixed Rate Cash ISA is open, you can record this through Online Banking or with our colleagues in branches or over the phone.
On the Maturity Date, we’ll convert your existing ISA with a Fixed Rate to a Cash ISA. If the Maturity Date isn’t a business day, we’ll do this on the next business day.
You’ll then be able to access your money on the maturity payment date. Please see Term 5 of the Fixed Rate ISA Terms for more information.
You can transfer your ISA to another provider. If the transfer is before the Maturity Date, we’ll convert your Fixed Rate ISA to a Cash ISA and an Early Closure Charge will apply.
If you want to transfer your Fixed Rate ISA without facing an Early Closure Charge, it must be dated at least the day after the Maturity Date, when your money is accessible.
Account open and ready to go? You’ll need to add money to your Fixed ISA before the final date to get the current ISA savings rate.
To see the closing date to open a fixed ISA, and the last date to make payments or withdrawals, check out our ‘Key dates’ section above.
After these dates, your savings will be locked in. You won’t be able to take money out unless you close or transfer your Fixed Rate ISA.
With this ISA, you can get fixed rates for different periods. The best way to work out if a one or two-year Fixed Rate ISA may be right for you is to think about your financial position. For example:
How long can you afford to lock away your savings for?
Are any big events or life moments on the horizon?
Do you have other savings that might cover an emergency?
What fixed ISA rates and returns are available?
The benefits of Fixed Rate ISAs include:
Drawbacks include:
No access to your savings till your fixed term ends. You could decide to fix cash ISA rates for 1 year or 2 years.
No option to make regular savings.
A charge to take your money out early.
Fixed Rate ISAs aren't your only option. We have a range of other savings accounts available. Check out all the options we've got to see if one might be right for you.
Please remember that once you move your money from an ISA to a non-ISA account the money will no longer have tax free status.
Specific account eligibility apply.
