United Kingdom calculator
UK ISA Allowance Calculator 2026/27
Track adult ISA subscriptions against the UK allowance for 6 April 2026 to 5 April 2027.
Use the calculator ↓Adjust the assumptions
UK ISA Allowance Calculator 2026/27
Track adult ISA subscriptions against the UK allowance for 6 April 2026 to 5 April 2027.
Result
£0
View year-by-year breakdown ＋
| Year | Contributions | Growth | Balance |
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Questions answered
What this calculator helps you work out
- How much of my 2026/27 ISA allowance remains?
- Do my subscriptions exceed the overall £20,000 limit?
- How much Lifetime ISA room remains within the overall allowance?
Common questions
UK ISA Allowance Calculator 2026/27 FAQs
What is the ISA allowance for 2026/27?＋
The overall adult ISA subscription limit is £20,000 for the 2026/27 tax year.
Does a Lifetime ISA use the main ISA allowance?＋
Yes. Up to £4,000 can go into a Lifetime ISA and that amount counts within the £20,000 overall limit.
Is the Junior ISA allowance included?＋
No. Junior ISAs have a separate £9,000 limit for 2026/27 and are not part of this adult calculator.
Go beyond the result
How the UK ISA Allowance Works in 2026/27
See a worked example, the trade-offs to consider and the assumptions that can change the answer.