Inputs
Family plan
Output
Fairness check
Assumptions
Junior ISA family planner
Split one monthly family budget between two children and see whether equal contributions actually produce fair outcomes at 18.
Inputs
Output
Assumptions
Short answer
If one child is older, the same monthly contribution has less time to compound. If one child already has a larger balance, equal monthly contributions can make the gap wider. This planner treats fairness as projected value at 18, not identical payments today.
Educational planning model only. This is not financial advice, tax advice, or a recommendation to use a Junior ISA.
Related calculators
This page plans contributions. Provider charges still matter, especially when the money has a decade or more to compound.
FAQ
Equal monthly contributions are simple, but they may not create equal outcomes if the children have different ages or starting balances.
A fair split usually gives more monthly contribution to the child with less time until 18 or the lower starting balance, if the goal is similar projected balances at 18.
No. Junior ISA money belongs to the child and is normally locked until age 18.