Grow your savings, tax free
A savings account built for larger balances. A flexible ISA with up to £360,000 FSCS protection across three partner banks.
- Earn up to 4.00% AER variable on new deposits (3.23% AER variable + 0.77% Sidekick Bonus for 6 months, on deposits up to £20,000).
- Transfer an existing ISA and earn a cash bonus of up to £500, paid after 12 months and earn 3.23% AER variable on top.
Two rates. Triple FSCS Protection. One account.
- Your ISA savings are managed across three partner banks, offering up to £360,000 FSCS protection, all through a single Sidekick account.
- Plus, because this is a flexible ISA, any money you withdraw can be put back in the same tax year - so you never lose the allowance you've already used.
Move your ISA. Pick up a bonus.
Transfer your existing Cash ISA to Sidekick and receive a cash bonus of up to £500 after 12 months. The more you bring, the more you earn.
- Transfer £10,000–£24,999, receive a £100 cash bonus
- Transfer £25,000–£74,999, receive a £250 cash bonus
- Transfer £75,000–£120,000, receive a £500 cash bonus
Why choose Cash ISA for your savings?
Our dedicated team is focused on maximising your wealth.
A competitive rate
Your rate is made up of two parts: a 3.23% AER variable base rate, plus a 0.77% Sidekick Bonus on new deposits for the first 6 months and up to £500 on an ISA transfer.
Secure and protected
Your savings are split across three Sidekick partner banks, each FSCS-protected up to £120,000. That gives you total coverage of up to £360,000 - three times the standard limit.
Easy access
The Sidekick Cash ISA is a fully flexible ISA. That means you can withdraw money whenever you need it - and re-deposit it later in the same tax year - without losing your annual ISA allowance. Not all Cash ISAs offer this. Ours does.
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Any questions on Cash ISA?
Quick answers to your top questions
New deposits earn 4.00% AER variable - made up of a 3.23% AER variable base rate plus a 0.77% Sidekick Bonus. The bonus rate applies to new deposits for the first 6 months, up to £20,000. After 6 months, the base rate of 3.23% AER variable applies. ISA transfers earn 3.23% AER variable plus a cash bonus of up to £500 maximum bonus per customer, paid after 12 months based on the remaining value of your qualifying ISA transfers at the 12-month mark. Terms apply.
When you transfer an existing Cash ISA to Sidekick, you earn a cash bonus based on the remaining value of your qualifying ISA transfers at the end of the 12-month mark: £100 for £10,000-£24,999 / £250 for £25,000-£74,999 / £500 for £75,000-£120,000. The bonus is paid into your Sidekick wallet after 12 months. Terms apply.
Yes. If you transfer an existing ISA and also make new deposits in the same tax year, you can benefit from both. Your new deposits earn up to 4.00% AER variable rate (including Sidekick Bonus) for 6 months on up to £20,000, and your transferred balance earns the 3.23% AER variable rate plus a cash bonus based on the remaining value of your qualifying ISA transfers at the end of the 12-month mark.
Your deposits are spread across three Sidekick partner banks. Each bank is FSCS-protected up to £120,000 per depositor - giving you total coverage of up to £360,000. This is calculated per depositor per bank, so the protection applies independently at each institution.
Yes. The Sidekick Cash ISA is a flexible ISA, which means you can withdraw money and re-deposit it within the same tax year without it counting against your annual ISA allowance of £20,000.