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Savings Tax & Cash ISA Break-Even

Find the Cash ISA rate that could match a taxable savings account after estimated tax. Tax inputs are deliberately editable.

Enter your figures

Savings balance (£)

Taxable savings annual interest rate (%)

Other taxable savings interest in this tax year (£)

Personal Savings Allowance available (£)

Estimated marginal tax rate on taxable savings interest (%)

Cash ISA annual interest rate (%)

Enter your figures and select Calculate.

All inputs and calculations stay in your browser. No account, no financial data stored.

Important limitations

Compare taxable savings interest with a Cash ISA using editable tax assumptions and rates. Figures are estimates based on your inputs. Check current official guidance and relevant terms before making a financial decision.