A Cash ISA pays interest completely tax free. A normal savings account only beats it if its rate is high enough to survive your tax once the Personal Savings Allowance runs out. This tool does that comparison for a year, and handles the common app trick of a headline bonus rate that drops after 12 months.
Compare what you actually keep
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Sets your Personal Savings Allowance: £1,000 basic, £500 higher, £0 additional.
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We show year one at the headline rate and what year two looks like at this drop rate.
Simple one-year interest, allowance applied before tax. ISA interest is always tax free. This is a guide for typical savers and does not cover the starting rate for savings, Scottish tax bands, or balances over the £20,000 annual ISA limit. Always check the provider's current terms.