You must be a UK resident aged 18+. You can only subscribe to one cash ISA with NatWest in this 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.
Applications for this Fixed Rate ISA are available until 5pm on 17 June 2026 to new-to-bank customers and 22 June 2026 to existing customers. Please note that these offers may be withdrawn early due to availability. Early closure charges may apply. Interest is calculated daily and paid annually.
Fixed Rate cash ISA interest rates
4.25% AER/Tax-free p.a. (fixed) on a 1 or 2 year term
- Tax‑free interest – All the interest you earn is tax‑free.
- Fixed rate, guaranteed – Lock in a set rate from £1,000.
- Annual interest payments – Added each year.
Fixed Rate cash ISA interest rates
4.25% AER/Tax-free p.a. (fixed) on a 1 or 2 year term
- Tax‑free interest – All the interest you earn is tax‑free.
- Fixed rate, guaranteed – Lock in a set rate from £1,000.
- Annual interest payments – Added each year.
Handy information to help you on your savings journey.
Opening your Fixed Rate ISA
Whether you are a new or existing customer, you can still open a Fixed Rate ISA with us. T&Cs apply.
Opening a Fixed Rate ISA as a new customer
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.
Key dates
17 June 2026 by 5pm
As a new customer, this is the last day you can apply and to make any external ISA transfers.
22 June 2026
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 23 June 2026.
Please ensure you read the summary box below before applying.
Already bank with us and want to open a Fixed Rate ISA?
If you already have a current account, credit card, loan or a savings account with us and want to open a 1 year or 2 year Fixed Rate ISA, select apply to begin your application.
Please ensure you read the summary box below before applying.
What is the interest rate?
Key dates
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.
Take a look at other saving options
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.