Finance

Junior ISA Allowance Calculator

Room left in Junior ISA for 2026/27.

Use the interactive calculator below for an instant estimate. Results depend on your inputs and the assumptions shown on the page.

Methodology and source status

Scope: Borrowing, saving, repayment, retirement, and financial-planning estimates.

Primary reference: MoneyHelper tools and calculator guidance.

Source record: Regulator-backed guidance source. This link is the calculator-specific evidence path, not a statement that every individual input or exception is current.

Effective period: Interest rates, product terms, eligibility and affordability vary by provider and personal circumstances. Use current product information and independent guidance before relying on an estimate.

Review status: Source path published; no named calculator-level review is currently represented here.

Last source or expert review: No calculator-level source or expert review date is published.

Technical validation: 12 August 2026 — catalogue build, route, metadata, and internal-link checks completed. This is a technical delivery check, not a review of current rates, rules, sources, calculations, or personal circumstances.

Next review trigger: Review when a relevant rate, threshold, provider fee, tax period, rule, or formula changes.