UK ISA Calculator
Use this uk isa calculator to estimate the growth of savings held in an ISA. Enter starting balance, regular deposits, return and time period and review estimated ISA value and growth.
Projected tax-free balance
—
Total contributed —
Tax-free growth —
Allowance used this year —
Assumes the current £20,000 annual ISA allowance — verify the current-year limit at gov.uk.
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How it works
FV = balance × (1+r)ᵗ + yearly contribution × ((1+r)ᵗ−1)/r, all growth tax-freeHow to use the UK ISA Calculator
Start by entering starting balance, regular deposits, return and time period. Keep the units consistent and check that each value belongs to the same question.
The result gives estimated ISA value and growth. Investment returns are not guaranteed and ISA rules can change. Use it as a guide and check any instructions, rules or professional advice that apply.
Frequently Asked Questions
What does this uk isa calculator calculate?
It gives estimated ISA value and growth. Investment returns are not guaranteed and ISA rules can change.
What information should I enter?
Enter starting balance, regular deposits, return and time period. Use the same units throughout so the result is easier to understand.
Are ISA returns guaranteed?
No. Savings and investment products have different risks and returns.