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Cynergy Bank Online ISA Review4.15% AER (Sep 2026)

Cash ISA from Cynergy Bank

Protection

FSCS

Up to £120,000

Min balance

£1

Max balance

£20,000

Access

Instant

Transfers in

Accepted

  • New and existing savers
  • Those wanting easy access
  • Savers happy with a £20,000 cap

Additional Info

Withdrawals and closure requests can only be made via Online Banking to your nominated account, or to another eligible Cynergy Bank account in your name.

Please verify all details with the provider – for more info read our Disclaimer

Estimated returns with Cynergy Bank's Cash ISA

Want to know how much interest you will receive with Cynergy Bank's Online ISA?

Estimated interest

£1,000 saved

£41.50

At 4.15% AER

£5,000 saved

£208

At 4.15% AER

£10,000 saved

£415

At 4.15% AER

£20,000 saved

£830

At 4.15% AER

Estimated over one year, assuming the rate stays the same and interest stays in the account. Amounts outside this account's minimum or maximum balance are left out.

Our Expert Opinion on Cynergy Bank Online ISA

Cynergy Bank's Online ISA pays 4.15% with instant access, no notice period, and no penalties for withdrawals or closure, which makes it a reasonable home for your ISA allowance if you want flexibility without sacrificing too much yield. The 20,000 pound cap means it suits a fresh annual subscription rather than a large transfer pot, though transfers in are accepted. I would still check Kent Reliance's Easy Access Cash ISA at 4.24% or Bank of Ireland UK's Online ISA Easy Access at 4.21% before committing, as both edge ahead on rate with a similar easy-access structure.

Compare Cash ISAs

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