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Cash ISA or savings account?
Which pays more after your tax, for 2026/27.
£
%
%
Tax band
£outside ISAs
With no other interest, the savings account pays more after tax, by
£22.50 a year
A year, after your tax
Savings account, 4.60% AER£690
Cash ISA, 4.45% AER£667.50
If your allowance is already used ›
With your allowance used, the savings account pays £552 after 20% tax, so the cash ISA pays £115.50 more.
How it's worked out ›
Cash ISA: £15,000 at 4.45% AER, tax-free£667.50
Savings: £15,000 at 4.60% AER, before tax£690
Personal Savings Allowance left, after £0 of other interest£1,000
Tax at 20% on £0£0
Savings, after your tax£690
A year's interest, if the amount and both rates stay the same. The starting rate for savings can mean less tax; it depends on your other income.
In 2027/28
The cash ISA limit is £20,000 a year, for every age.
Next step
Compare cash ISA rates ›Rates as we read them, highest first.