Saving & Investing

See how your ISA allowance could grow tax-free.

Estimate the future value of a Cash ISA or Stocks & Shares ISA, see how much of the annual ISA allowance you use and understand how much remains available.

2026/27 ISA allowance Tax-free wrapper explained Plain-English results

ISA Calculator

Model your annual ISA subscriptions and potential tax-free growth.

Live

Last checked 4 August 2026

ISA type Current ISA balance

Planned annual ISA contribution

The 2026/27 overall ISA allowance is £20,000. Assumed annual rate

Projection period

Annual contribution made

Estimated tax-free ISA value £0

0% of annual allowance

Total ISA subscriptions£0

Estimated tax-free growth£0

Allowance remaining each year£0

Your results explained

Your ISA projection will appear here.

What makes up your projected ISA?

Compare your ISA subscriptions with the estimated tax-free growth.

0% subscriptions

0% estimated growth

How your ISA could grow

Illustrative year-by-year projection using your chosen rate and contribution.

ISA value Subscriptions

After year 1£0£0 growth

Halfway point£0£0 growth

Final year£0£0 growth

Play with the numbers

Try changing your annual contribution, assumed rate, ISA type or timeframe to see how the projection changes.

This calculator models Cash ISAs and Stocks & Shares ISAs, not Lifetime ISAs. The projection assumes the same ISA allowance continues in future tax years. Investment returns are not guaranteed and can be negative. ISA rules can change.