Junior ISA Calculator
What regular saving into a Junior ISA could be worth at 18, with the £9,000 yearly limit (frozen until April 2031) applied.
A Junior ISA can take up to £9,000 a year in 2026/27, a limit frozen until April 2031. The child takes control at 16 and can withdraw the money at 18; £100 a month from birth at an assumed 5% a year grows to about £34,000 by 18.
Junior ISA Calculator
Frequently asked
Is the Junior ISA Calculator free?
Yes. Every tool on AlphaBetaMinds is free, needs no account and has no usage limit.
Does this tool store what I type?
No. It runs entirely in your browser. Your inputs are never sent to our server, and nothing is logged.
How accurate is it?
It uses the McCrindle generation boundaries (Gen Alpha 2010–2024, Gen Beta 2025–2039) and UN World Population Prospects vital rates. Sources and formulas are on our methodology page.
Can I use the result in an article or report?
Yes, with a credit and a link back to this page. See our terms of use for the full licence.
More family money & benefits
Tax-Free Childcare Calculator
How much the government adds to your childcare bill through Tax-Free Childcare: £2…
Assegno Unico Calculator 2026 (in English)
Estimate Italy's Assegno Unico for 2026 in English from your ISEE, your children's…
Child Benefit Explainer by Country
What child-related payments and schemes exist in each country, in plain language —…
Childcare Cost vs Salary
The point at which a second income stops paying for itself, and the…
Two-Child Limit Scrapped: UC Gain and Benefit Cap Checker
How much more Universal Credit you get now the two-child limit has gone…
Child Trust Fund Checker by Date of Birth
Were you due a Child Trust Fund? Enter a birth date to see…
Child Benefit in Europe by Country (2026)
How much child benefit each European country pays a month per child in…
Trump Account Eligibility Checker: $1,000 Seed and Dell $250
Does your child get the $1,000 Treasury seed (born 2025-2028), Michael and Susan…