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Best Variable-Rate ISA

Growing your money and saving it from the taxman, while being able to access it easily? Yes, please!
Dunja Radonic
Author: 
Dunja Radonic
Muze Hasan
Editor: 
Muze Hasan
10 mins
November 9th, 2023
Advertising Disclosure

A variable rate ISA, which pays interest on a variable rate, is an excellent choice to benefit from hiking interest rates. We scraped the market to find you the best rates available – scroll down to find out about best deals available, get informed about how variable-rate ISAs work, and whether they are the right choice for you.

Best Variable-Rate ISA Providers Reviewed

We did the research for you and made sure to cover different savings needs, minimum and maximum balances, and most importantly, only the best variable cash ISA rates.

A look into the best variable rate ISAs
  • Best Easy Access Variable ISA at a Large Bank: Virgin Money

  • Best Variable ISA Overall: Shawbrook

  • Best Online Variable ISA with a Large Bank: Santander

  • Best Variable-rate Notice ISAs: Paragon Bank

  • Best Online ISA at a Specialist Bank: Cynergy

1. Virgin Money – Best Easy Access Variable ISA at a Large Bank

Interest rate

3.75% AER

Account type

Easy Access Cash ISA

Notice

None

Interest Paid

Annually in December

Virgin Money is one of the biggest banks in the UK whose ISA offers you flexibility and most management and payment features. It offers an easy-access variable ISA exclusive to its current account holders. It’s possible to switch to a current account and get access to it. You can manage your ISA in the app, online, by telephone, post, or in-store.

The bank lets you open this Cash ISA in-store or online, and you also have plenty of withdrawal options.

Pros
  • High interest rate
  • Accepts partial ISA transfers
  • Flexible features
  • No minimum and maximum balance
Cons
  • Have to have a current account at Virgin Money
  • Poor customer support reviews
  • Customer support not 24/7
Virgin Money8.0Visituk.virginmoney.com

2. Shawbrook – Best Variable ISA Overall

Interest rate

3.78% AER

Account Type

Easy Access Cash ISA

Notice

None

Interest Paid

Annually/Monthly

Shawbrook is a specialist bank that offers financing and savings products. Its easy-access variable ISA is a market leader when it comes to interest rates. However, it has a cap on the amount of money you can hold in this ISA, which can be tricky for people with larger savings goals.

When it comes to opening and managing an ISA, you can do everything online quickly and efficiently. However, the minimum withdrawal at any time is £500.

Pros
  • Exceptional interest rate
  • Easy setup and management
  • Excellent reviews
  • Excellent customer support
Cons
  • Minimum balance £1,000
  • Interest rate 0.25% AER under £1,000
  • Maximum balance £250,000
  • Not flexible
Shawbrook Bank7.1Visitwww.shawbrook.co.uk/

3. Santander – Best eISA with a Large Bank

Interest rate

3.20% AER

Account Type

Online ISA

Notice

None

Interest Paid

Annually in March

Santander’s eISA combines the quick and modern features of an online ISA with the safety of a larger bank. However, this ISA is different from other variable-rate ISAs in one aspect: the account and interest rate last for 12 months from the day of opening only.

While your minimum balance is £1, your maximum is £2 million, which is twice as high compared to Cynergy Bank. Also, you can make deposits via standing order, one-off payments or online transfers.

Pros
  • Great interest rate
  • Interest applies from £1
  • Designed for online management
  • No transfer limitations
  • Large, established bank
Cons
  • Not flexible
  • Minimum opening deposit £500
  • Limited hold time

4. Paragon Bank - Best Variable-Rate Notice ISAs

Interest rate

4.60-4.65% AER

Account Type

Notice ISA

Notice

120 days/180 days

Interest Paid

Annually/Monthly

Paragon offers one of the highest interest rates you can find for variable-rate notice ISAs, with 4.60% for its 120 days notice ISA and 4.65% for the 180 days notice. The ISA can be opened, managed, and transferred online and the website is quick and intuitive.

However, there is no app, so if it’s a dealbreaker, you can check out Santander or Virgin Money.

Pros
  • Top interest rate
  • Cheque deposits available
  • Flexible
  • Managed online
  • Good customer support
Cons
  • Maximum balance £500,000
  • Account closes when balance falls below £500
  • No current accounts available
  • No Direct Debit

5. Cynergy – Best Online ISA at a Specialist Bank

Interest rate

3.85% AER

Account Type

Online Cash ISA

Notice

None

Interest Paid

Annually in March

Cynergy is a specialist bank with great savings accounts including a top easy-access online ISA. While it does have a higher interest rate compared to Santander’s eISA at 3.20%, it doesn’t come with as many payment, transfer, and account options compared to the classic large bank.

On the other hand, it does have excellent reviews for customer support and comes with easy setup and management.

Pros
  • Exceptional interest rate
  • Minimum balance £1
  • No minimum withdrawal
  • £1 million maximum
Cons
  • Transfers-in at time of application only
  • Not flexible
  • Only electronic transfers
  • No app
  • No current account available
  • No Stocks and Shares ISA transfers
Cynergy Bank7.4Visitwww.cynergybank.co.uk/

How We Rate & Review The Best Variable-rate Cash ISAs

Here are the criteria we used to curate this list of the best variable-rate ISAs:

  • Regulation: All of the providers are regulated by the FCA and have Financial Services Compensation Scheme protection.

  • Interest rates: To keep your money growing fast enough, we only included variable-rate ISAs with interest rates above 3%.

  • Online management: Time is money so we made sure to include only institutions that let you manage your ISA online.

What is a variable-rate ISA?

A variable rate ISA is an individual savings account with an interest rate that can change.

Variable rate ISAs are a type of cash ISA — the choice between variable and fixed rate cash ISAs does not apply to LISAs, Stocks and Shares ISAs, and Innovative Finance ISAs.

However, just like other ISAs, a variable rate ISA is a tax-efficient savings account — meaning you won’t be paying tax on interest.

How does a variable ISA work?

As opposed to fixed ISAs, a variable ISA is flexible in several ways:

  • It lets you deposit money whenever you want.

  • Your access to money is either instant or relatively easy (terms vary by provider and type of account).

  • You can hold the money in a variable-rate ISA for as long as you want.

Your ISA interest rate can change since a variable ISA’s availability comes at the cost of predictable interest rates.

Your provider has the right to change your interest rate at any time. For example, the rate usually changes when the Bank of England changes the base rate. Depending on your terms, it can also change when your balance goes above or below a certain threshold.

Is it better than a fixed-rate ISA?

The answer can depend on what you need from your savings account:

  • A variable-rate ISA can be better than a fixed-rate cash ISA accounts if you want to save regularly and have free access to your savings. This flexibility lets you cover any unexpected expenses without losing money on penalties.

  • A fixed-rate ISA can be better if you know you won’t need a certain sum of money during the fixed period. So if you’re saving with a particular goal in mind, the fixed (and usually higher) rate lets you calculate the exact sum you should have at the end of the term.

What are the different types of variable-rate ISAs?

The two main types of variable-rate ISAs are the Notice ISA and the Easy-access ISA, both suitable for different purposes. Here are the two types in more detail:

Notice ISA

Having a notice ISA means that when you want to withdraw money, you need to give notice to the provider in an agreed way (e.g. email, telephone, online) and take the money out after an agreed time has passed (e.g. 60 days). However, if you need to withdraw the money or close the account before the notice period ends, you will usually pay a penalty.

Easy-access ISA

On the other hand, easy-access ISAs give you instant access to your savings with no penalties. However, instant access to your savings usually means lower interest rates compared to notice ISAs.

Notice: how many ISAs can I have?

You can have as many ISAs as you want, but you can only pay into one of each type within a given tax year. If you stay within the limits of your annual ISA allowance, you can pay into one LISA, one Cash ISA, one Stocks and Shares ISA, and one Innovative Finance ISAs and Junior ISAs have different rules and don’t count towards your standard annual ISA allowance.

What are the main differences between a fixed-rate and variable-rate ISA?

The main differences between fixed-rate and variable-rate ISA and fixed-rate ISAs come down to different interest rate and access rules.

Fixed-rate ISAs have interest rates that don’t change for a set period (e.g. one year). However, your money is locked away until the period is over and your account reaches maturity. This also means you won’t be able to access it without losing your tax-free status and interest, which can be quite costly.

It’s the opposite with variable-rate ISAs: interest rates can change, but you can access your money more easily, either instantly or after a notice period.

Here’s a quick overview

Variable-rate ISA

Fixed-rate ISA

Interest rates

💰Lower

💰💰Higher

Withdrawals

✔️Instant or after a notice period

❌Not allowed before the pre-arranged period ends

Deposits

✔️Allowed whenever you want

❌Only within a predetermined window

Hold time

✔️As long as you want

❌Fixed

Risks and benefits of variable rate ISAs

Before you decide to open a variable-rate ISA, consider the what you can gain or lose:

  • Easier access to money

  • Unlimited hold period

  • The possibility of your rate rising

  • The Bank of England raising the base rate

  • Deposit any time you like

  • Lower interest rates compared to other ISAs

  • The possibility of your rate dropping

  • The Bank of England lowering the base rate

  • Planning more difficult

How much can I save with a variable ISA?

Let’s assume you put £10,000 into a variable rate ISA with an interest rate of 3.75% for three years and the interest is paid annually. You don’t take out any money.

At the end of the first year you would have £10,375. After the second year and another £10,000, you would have £21,140. If you added another £10,000 in the third year, at the same average rate, you would have £33,475.
This means you earn £3,475 in tax-free interest.

However, to decide if a variable-rate ISA is the best way to grow your cash, you need to take the following rules into account.

What is the ISA allowance limit?
Is it a flexible ISA?

Best variable rate ISAs – Recap

Finally, let’s take another look at the variable ISAs that made it onto our list:

Account name

Interest rate

Minimum opening balance

How to apply

Accept cash ISA transfers?

Accept stocks and shares ISA transfers?

FSCS protected?

Virgin Money

Easy Access Cash ISA Exclusive

3.75% AER

£1

in-store or online

✔️

✔️

✔️

Shawbrook

Easy Access Cash ISA

3.78% AER

£1,000

online

✔️

✔️

✔️

Santander

eISA

3.20% AER

£500

online

✔️

✔️

✔️

Paragon Bank

Notice ISA

4.60-4.65% AER

£500

online

✔️

✔️

✔️

Cynergy

Easy Access Online ISA

3.85% AER

£1

online

✔️

✔️

FAQ

What is the total annual ISA allowance?
Can you save into more than one ISA?
Are variable ISAs protected by the FSCS?
What is a fixed vs variable ISA?

More ISAs and Savings Advice

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Contributors

Dunja Radonic
Dunja is an English Literature graduate with years of experience as a writer and translator. She doesn't mind diving into as many reports and numbers as she can—especially about topics like crypto that still need some translating to the public—’cause she loves to get the message across. When she's not working, you'll find her running wild with her pack of dogs, playing board games, or bingeing on pop science videos.
Muze Hasan
Muze Hasan is a technical writer with deep experience writing for the Finance industry for topics including but not limited to stocks, cryptocurrency, mergers, acquisitions, valuation, and insurance. He is also a subject matter expert on Blockchain technology and has designed a plethora of web 3.0 whitepapers and pitch decks. On weekends, you can find him riding his Harley Davidson on the Himalayan mountain range.