Compare our best cash ISA rates

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The FSCS guarantees that the first £120,000 you have saved with a registered bank or building society will be safe even if the business goes bust. However, we can't guarantee that all non-affiliated products on our panel are covered by the FSCS.
39 results found, sorted by highest interest rate. We always order products with our partners first and we may receive a small commission if you click on the deal and then purchase it. Find out how we order our comparisons.

Moneybox Cash ISA

Term
Easy access
Open with
£500
Interest rate
4.39% AER variable inc. 0.94% fixed bonus for 12 months
Protection scheme
FSCS
ISA transfers in
Accepted
Rate drops to 3.45% after first 12 months. ISA & tax rules apply. A lower interest rate of 0.75% AER (variable) applies whenever your account balance is less than £500. It also applies for the rest of your current 12-month period from your fourth withdrawal. The number of withdrawals permitted will reset on the anniversary of the account opening date.
If more than 3 withdrawals are made in each 12 month period from account opening, the rate will drop to a lower rate from the date of the 4th withdrawal, for the remainder of that 12 month period.
More Information
Rate Tiers
Gross rateGross rateAER rateAER rate
Excluding bonusIncluding bonusExcluding bonusIncluding bonus
£5003.4%4.3%3.45%4.39%
Eligibility
Maximum AgeUnlimited
Minimum Initial Deposit£500
Minimum Age18 years
Permanent UK Resident

Plum Cash ISA

Term
Instant access
Open with
Any amount
Interest rate
4.36% AER variable on £1+ inc. 1.82% fixed bonus for 12 months
Protection scheme
FSCS
ISA transfers in
Accepted
Rate includes a Plum bonus of 1.41% AER (variable) if kept for 12 consecutive months and other conditions are met. After 12 months, the rate will be 3.04% AER (variable). Interest on our Cash ISA varies. This is the rate from 30/10/25. ISA rules and T&Cs apply. Plum is not a bank
Tax treatment depends on your personal circumstances and is subject to change
No notice, penalty, or charge applies.
More Information
Rate Tiers
Gross rateGross rateAER rateAER rate
Excluding bonusIncluding bonusExcluding bonusIncluding bonus
£12.52%4.32%2.54%4.36%
Eligibility
Maximum AgeUnlimited
Minimum Age18 years
Permanent UK Resident

Hampshire Trust Bank 5 Year Online ISA Fixed Saver (Issue 8)

Term
5 years
Open with
£1
Interest rate
4.18% AER fixed
Protection scheme
FSCS
ISA transfers in
Accepted
Withdrawals are not permitted during term. Closure is permitted during term of the account subject to a charge equivalent to 450 days interest on the amount invested.
More Information
Rate Tiers
Gross rateGross rateAER rateAER rate
Excluding bonusIncluding bonusExcluding bonusIncluding bonus
£14.18%4.18%4.18%4.18%
Eligibility
Maximum AgeUnlimited
Minimum Initial Deposit£1
Minimum Age18 years
Permanent UK Resident

Castle Trust Bank 5 Year Fixed Rate e-Cash ISA

Term
5 years
Open with
£1,000
Interest rate
4.17% AER fixed
Protection scheme
FSCS
ISA transfers in
Accepted
Withdrawals are not permitted. Early closure is permitted (including transferring to another ISA provider) but this will be subject to an interest penalty of 360 days’ interest, which may result in you receiving less money than you originally deposited.
More Information
Rate Tiers
Gross rateGross rateAER rateAER rate
Excluding bonusIncluding bonusExcluding bonusIncluding bonus
£1,0004.17%4.17%4.17%4.17%
Eligibility
Maximum AgeUnlimited
Minimum Initial Deposit£1,000
Minimum Age18 years
Permanent UK Resident

Investec 1-Year Fixed Rate Cash ISA

Term
1 year
Open with
£1,000
Interest rate
4.14% AER fixed
Protection scheme
FSCS
ISA transfers in
Not accepted
No withdrawals permitted during the term of the account. Closure permitted subject to 90 day interest penalty.
More Information
Rate Tiers
Gross rateGross rateAER rateAER rate
Excluding bonusIncluding bonusExcluding bonusIncluding bonus
£1,0004.14%4.14%4.14%4.14%
Eligibility
Maximum AgeUnlimited
Minimum Initial Deposit£1,000
Minimum Age18 years
Permanent UK Resident

Moneybox Open Access Cash ISA

Term
Instant access
Open with
£500
Interest rate
4.1% AER variable inc. 0.85% fixed bonus for 12 months
Protection scheme
FSCS
ISA transfers in
Accepted
Enjoy unlimited withdrawals. Rate drops to 3.25% AER (variable) after first 12 months. ISA & tax rules apply. A lower interest rate of 0.75% AER (variable) applies whenever your account balance is less than £500.
No notice, penalty, or charge applies.
More Information
Rate Tiers
Gross rateGross rateAER rateAER rate
Excluding bonusIncluding bonusExcluding bonusIncluding bonus
£5003.2%4.02%3.25%4.1%
Eligibility
Maximum AgeUnlimited
Minimum Initial Deposit£500
Minimum Age18 years
Permanent UK Resident

Castle Trust Bank 1 Year Fixed Rate e-Cash ISA

Term
1 year
Open with
£1,000
Interest rate
4.07% AER fixed
Protection scheme
FSCS
ISA transfers in
Accepted
Withdrawals are not permitted. Early closure is permitted (including transferring to another ISA provider) but this will be subject to an interest penalty of 90 days’ interest, which may result in you receiving less money than you originally deposited.
More Information
Rate Tiers
Gross rateGross rateAER rateAER rate
Excluding bonusIncluding bonusExcluding bonusIncluding bonus
£1,0004.07%4.07%4.07%4.07%
Eligibility
Maximum AgeUnlimited
Minimum Initial Deposit£1,000
Minimum Age18 years
Permanent UK Resident

Castle Trust Bank 3 Year Fixed Rate e-Cash ISA

Term
3 years
Open with
£1,000
Interest rate
4.05% AER fixed
Protection scheme
FSCS
ISA transfers in
Accepted
Withdrawals are not permitted. Early closure is permitted (including transferring to another ISA provider) but this will be subject to an interest penalty of 270 days’ interest, which may result in you receiving less money than you originally deposited.
More Information
Rate Tiers
Gross rateGross rateAER rateAER rate
Excluding bonusIncluding bonusExcluding bonusIncluding bonus
£1,0004.05%4.05%4.05%4.05%
Eligibility
Maximum AgeUnlimited
Minimum Initial Deposit£1,000
Minimum Age18 years
Permanent UK Resident

Aldermore Reward ISA Single Access Account Issue 8

Term
Easy access
Open with
£100
Interest rate
4% AER variable
Protection scheme
FSCS
ISA transfers in
Accepted
If 2 or more withdrawals are made then the bonus reduces for the rest of the anniversary year and will reset on the anniversary of account opening.
More Information
Rate Tiers
Gross rateGross rateAER rateAER rate
Excluding bonusIncluding bonusExcluding bonusIncluding bonus
£1002.9%4%2.9%4%
Eligibility
Maximum AgeUnlimited
Minimum Initial Deposit£100
Minimum Age18 years
Permanent UK Resident

Aldermore 3 Year Fixed Rate Cash ISA

Term
3 years
Open with
£1,000
Interest rate
4% AER fixed
Protection scheme
FSCS
ISA transfers in
Accepted
Withdrawals and closure permitted subject to 180 days loss of interest penalty.
More Information
Rate Tiers
Gross rateGross rateAER rateAER rate
Excluding bonusIncluding bonusExcluding bonusIncluding bonus
£1,0004%4%4%4%
Eligibility
Maximum AgeUnlimited
Minimum Initial Deposit£1,000
Minimum Age18 years
Permanent UK Resident