ISA Calculator
Project Individual Savings Account growth within UK allowances.
UK Stocks & Shares / Cash ISA planning. Annual subscription limit £20,000.00 (2025/26 & 2026/27). Looking for the US equivalent? Try the Roth IRA Calculator.
Amounts already paid into ISAs in the current tax year
Projected ISA value
£81,877.03
Remaining allowance this year: £18,000.00
Total contributions
£60,000.00
Growth
£21,877.03
This year’s monthly room
£1,500.00
Allowance rules and product types can change. Growth is tax-free inside an ISA under current rules — this is not tax advice.
In-depth explanation
Project UK ISA growth with monthly contributions and expected returns, while tracking remaining annual subscription allowance (£20,000 for 2025/26 and 2026/27). For US tax-advantaged investing, use the Roth IRA Calculator instead. Everything runs locally in your browser — your inputs are not uploaded to produce the result.
The annual subscription limit used here is £20,000 for the 2025/26 and 2026/27 tax years (confirm on GOV.UK if rules change). There isn’t an exact match. The closest everyday comparison for tax-free investment growth is a Roth IRA — use the separate Roth IRA Calculator for US limits and income phase-outs.
The maths is the same for projecting balance. Product risk and returns differ — enter an expected growth rate that matches your ISA type. Rules on multiple subscriptions have eased in recent years, but the overall annual allowance still applies across them. Enter what you’ve already subscribed this tax year. Use ISA Calculator for quick planning; confirm important money, tax, or health decisions with an official source or professional when needed.
Frequently asked questions
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