Santander Instant Cash ISA rate

It’s always good to research Cash ISA rates. Check out the latest instant-access Cash ISA rate offered by Santander.

Last updated: Sep 16, 2025

Next review on: Jan 10, 2025

2.00% AER

( min. balance)

4.20% AER1

2.00% AER

( min. balance)

3.04% AER1

Chart used for illustrative purposes. Rates used and offered are for new customers only, and these rates may change. Why we’ve compared this product.

18+ UK resident only

Chip does not provide tax advice. Tax treatment depends on individual circumstances and may be subject to change in the future. Your Chip Cash ISA is a cash ISA provided by ClearBank Limited. ISA limits apply. Deposit up to £20k per tax year.

Santander Instant Cash ISA rate source: https://www.santander.co.uk/personal/savings-and-investments/isas/easy-access-isa.

T&Cs apply. 3.04% (AER variable tracker), comprised of 3.00% gross interest which tracks 1.00% under the Bank of England base rate. See terms and conditions. AER stands for Annual Equivalent Rate and illustrates what the interest rate would be if interest was paid and compounded once each year.

18+ UK resident only

Chip does not provide tax advice. Tax treatment depends on individual circumstances and may be subject to change in the future. Your Chip Cash ISA is a cash ISA provided by ClearBank Limited. ISA limits apply. Deposit up to £20k per tax year.

Santander Instant Cash ISA rate source: https://www.santander.co.uk/personal/savings-and-investments/isas/easy-access-isa.

1 4.20% AER (variable tracker). Comprised of an underlying standard AER of 3.04% (3.00% gross, which tracks 1.00% under the Bank of England base rate), plus a 1.16% AER boost applied for 12 months from the day you open the account.  Chip account required. AER stands for Annual Equivalent Rate and illustrates what the interest rate would be if interest was paid and compounded once each year. For more information see the Cash ISA Summary Box

Initial deposit (or ISA transfer)
£
Monthly deposits
£
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
Interest rate (AER%)
4.20%
Value after 1 year
result
Interest rate (AER%)
rate
Value after 1 year
result

* Santander offers 2.00% on balances higher than , and on balances below.

You could earn result more after a year with Chip.
Initial deposit (or ISA transfer)
£
Monthly deposits
£
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
Interest rate (AER%)
3.04%
Value after 1 year
result
Interest rate (AER%)
rate
Value after 1 year
result

* Santander offers 2.00% on balances higher than , and on balances below.

You could earn result more after a year with Chip.
This calculator has been created for illustrative purposes and is an estimation.

What is the current Santander Instant Cash ISA rate?

  • The Santander Easy Access ISA currently offers a rate of 2.00% AER (variable) for 12 months.
  • Interest on this account is paid annually.
  • You can open a Santander Easy Access ISA from £500 and can withdraw money from this account at any time with no penalty. 
  • After 12 months, your account is transferred to an ISA Saver.

Important information

This comparison is intended for informational purposes only. We have selected the Barclays Instant Cash ISA as the most comparable product to the Chip Cash ISA for new customers. Santander offers a range of other ISA products that may be better suited to your needs, including fixed-rate and premier accounts. The best product for you depends entirely on your personal financial circumstances. We strongly recommend that you conduct your own research or seeking financial advice before making any decisions.

What is an instant
Cash ISA?

What is an Instant Cash ISA?

An Instant Cash ISA is a savings account where you earn interest on your money without paying tax on it, while still being able to access your funds freely whenever you need them.

Is this account it right for me?

A Cash ISA could be the perfect choice if you're looking for a flexible way to save and want to maximise your tax-free allowance.

How to research and compare Cash ISA accounts

Tips for comparing Cash ISAs

The right Cash ISA should match your savings style while helping you make the most of your tax-free allowance. Here are some things to keep in mind:

Explore a range of providers

Don't just stick to high street banks. Online banks, building societies, and app-based providers, like Chip, often offer more competitive rates. Compare interest rates, account features, and access options, whether it's via an app, online banking, or in-branch.

Check the account rules

Even with 'instant access,' some ISAs may have restrictions on withdrawals, minimum deposits, or when interest is paid. Always read the terms carefully. Remember, withdrawing funds could affect your annual ISA allowance, so know the potential impact before you take money out.

Look beyond bonus rates

Some providers offer an introductory rate to attract new savers. While a higher rate is appealing, check how long it lasts and what the standard rate is afterward. Evaluate the long-term viability of the account beyond the initial bonus.

Use financial tools to assess your options

There are a variety of online financial tools that can help you quickly understand the rate of your returns. Use our Interest rates calculator to see how your money could grow over time based on interest rates, deposits, and length of time.

Earn up to 4.20% with a Chip Instant Cash ISA

New customers earn a boosted 4.20% AER (variable tracker) for 12 months. Then the standard rate of 3.04% AER (variable tracker). T&Cs apply.

Is it worth having a Cash ISA?

An instant Cash ISA can be a smart way to grow your savings while keeping them accessible. But, like any other financial product, it’s worth weighing up the benefits and drawbacks before you decide.

Advantages

Tax-free growth:

Any interest you earn is free from UK income tax, which helps your savings grow faster and more efficiently2.

Flexible access to your savings:

Many accounts offer instant, penalty-free access to your funds, providing you with the flexibility you need for unexpected costs.

Save your way:

You can save at your own pace. Many providers let you deposit regular amounts or large lump sums, giving you complete control over your savings plan.

Wide choice of providers:

You aren't limited to one type of bank. High street, online, and app-based providers all offer competitive rates and features, so you can shop around for the best fit.

Disadvantages

Lower interest rates:

Instant Cash ISAs typically offer lower interest rates compared to fixed-rate or notice accounts, as they provide more flexibility to access your cash.

Annual allowance limits:

Your deposits are limited to the annual ISA allowance (£20,000 for 2025/26), which can be a restriction for those with larger savings.

Possible withdrawal restrictions:

Some accounts may limit the number of withdrawals or lower your interest rate if you take money out too often. Always check the terms carefully.

Variable rates:

Interest rates on these accounts can change at any time, which means your returns could go up or down.

2Chip does not provide tax advice. Tax treatment depends on individual circumstances and may be subject to change in the future.

People also ask

Common Cash ISA questions

Is it worth having a Cash ISA anymore?
A Cash ISA is still a smart choice because it lets your savings grow tax-free, no matter how much interest you earn.

With competitive rates now available, it can be just as rewarding as other savings accounts while protecting you from future tax changes. It’s a simple, secure way to make the most of your money.
Are Cash ISAs being phased out?
No, Cash ISAs are not being phased out.

They remain a popular, government-backed way to save tax-free, and current proposals only look at adjusting allowances, not removing them. For savers, they’re still a secure and future-proof option.
Do you pay tax on a Cash ISA?
No, you don’t pay any tax on the interest earned in a Cash ISA. All the returns are completely tax-free, regardless of your income level. That makes them a simple way to protect your savings from future tax changes.

Still have questions?