ISA Calculator
Grow money completely tax-free inside your £20,000 annual ISA allowance — no tax on interest, dividends or capital gains, ever.
Projected ISA Value
£0
Total Contributions£0
Tax-Free Growth£0
Same Investing Outside an ISA (basic-rate)£0
Tax the ISA Wrapper Saves You£0
The overall ISA allowance stays £20,000 for 2026/27 across Cash, Stocks & Shares, Innovative Finance and Lifetime ISAs combined (LISA has a £4,000 sub-limit with a 25% government bonus for first homes/retirement). Outside an ISA, the comparison assumes 20% tax on growth — with the CGT exemption now just £3,000 and dividend allowance £500, investing unwrapped gets taxed quickly. Use the allowance before 5 April; it doesn't roll over. Estimates only.