Junior ISA Allowance 2027/28: What a Frozen Limit Until 2030 Could Mean for Families
The Junior ISA allowance for the 2027/28 tax year is £9,000. This is the maximum amount that can be contributed into a Junior ISA (also known as a JISA) for a child between 6 April 2027 and 5 April 2028.
The allowance applies per child, rather than per parent or contributor. Parents, grandparents, and other family members can all contribute, but the combined total paid into the Junior ISA during the tax year cannot exceed the annual limit.
The Junior ISA allowance has remained unchanged for several years and is expected to remain frozen until 2030. While that makes the rules simple, it also means inflation becomes an important factor in understanding what the allowance is really worth over time.
A frozen £9,000 allowance may look the same each year, but in real terms it can lose spending power as prices rise.
What inflation could mean for a frozen Junior ISA allowance
If the Junior ISA allowance remains fixed at £9,000 through to 2030, its real-world value will depend heavily on inflation.
The table below illustrates what happens to the purchasing power of a £9,000 Junior ISA allowance over time if inflation averages at around 2.7%. We have also benchmarked what would happen to £9,000 if it were invested and the returns were 5% P.A (which, based on historical averages, is what we see here at the Children’s ISA).
Why this matters for families saving for the long term
| Tax Year | Starting Amount (2027/28) | Value If Eroded by 2.7% Inflation | Value If Growing at 5% Annually |
| 2027/28 | £9,000 | £9,000 | £9,000 |
| 2028/29 | £9,000 | ~£8,764 | ~£9,450 |
| 2029/30 | £9,000 | ~£8,536 | ~£9,923 |
Junior ISAs are frequently used by parents and grandparents to build savings for future milestones, such as university costs, driving lessons, a first home deposit, or simply giving a child a financial head start.
If the Junior ISA allowance remains frozen until 2030, families may still be able to contribute a significant amount each year. However, inflation can reduce what those contributions are able to achieve in terms of real spending power.
This is particularly relevant when interest rates fall. If cash savings rates decline while inflation remains elevated, the value of money held in cash can erode over time.
Key Junior ISA (JISA) rules for 2027/28
The Junior ISA allowance for 2027/28 remains £9,000 per child.
The allowance is shared equally across all contributions, regardless of who makes the payment. That means parents and grandparents can contribute separately, but the total must stay within the £9,000 annual cap.
If a child holds both a cash Junior ISA and a stocks and shares Junior ISA, the allowance still applies across both accounts combined.
Unused allowance cannot be carried forward. If less than £9,000 is contributed in 2027/28, the remaining portion is lost once the tax year ends.
Using the Junior ISA allowance effectively
The Junior ISA remains one of the most established tax-efficient savings options available for children in the UK. For many families, it offers a structured and straightforward way to set aside money over the long term.
At The Children’s ISA, we help families understand how the Junior ISA allowance works, including how the 2027/28 Junior ISA allowance can be used as part of a long-term plan. Whether you call it a Junior ISA or a JISA, the key is understanding how the allowance functions over time, especially when inflation is taken into account.
The Junior ISA allowance for 2027/28 is still £9,000. The bigger issue is what that £9,000 may be worth in real terms by the end of the decade.
