Child Trust Fund Calculator — Check What Your CTF Is Worth — UK 2026

ISA Calculator UK

Understanding Your Investment Returns

This calculator projects your returns using compound interest, where your earnings generate their own earnings over time. The power of compounding means that even small regular investments can grow into substantial wealth over long periods. For example, investing just Rs 5,000 per month at 12% expected returns for 25 years can grow to over Rs 1 crore — of which only Rs 15 lakh is your own money and Rs 85 lakh is compounding returns. The key factors that determine your final corpus are: the amount invested, the rate of return, the duration of investment, and the frequency of compounding.

Important Considerations

Past returns do not guarantee future performance, especially for market-linked instruments like mutual funds and equities. The returns shown are estimates based on the rate you enter. Equity investments carry market risk but have historically delivered 12-15% CAGR over 15+ year periods in India. Fixed income options like PPF (7.1%) and FD (6-7.5%) offer lower but more predictable returns. Diversifying across asset classes — equity, debt, gold, and real estate — reduces overall portfolio risk while optimizing returns for your risk tolerance.

Finding and Valuing a Lost Child Trust Fund

Around 6.3 million Child Trust Funds were opened for children born between 1 September 2002 and 2 January 2011, seeded with government vouchers of £250 (£500 for lower-income families), cut to £50/£100 for children born from 1 August 2010. HMRC has estimated that roughly a million accounts have matured unclaimed or sit dormant — estimates vary by year and definition, but the unclaimed pool is estimated at over £1 billion. To trace a lost CTF, use HMRC's free 'Find a Child Trust Fund' service on GOV.UK. You need a Government Gateway login and your National Insurance number; HMRC typically responds within about three weeks with the provider's name. Avoid paid 'CTF tracing' firms charging £25-£350 for this free lookup — the Share Foundation also traces accounts free of charge, including for young people who grew up in care. Valuing the account is the second hurdle, because providers merged repeatedly over two decades: Family Investments became OneFamily, The Children's Mutual book moved to Foresters Financial, and several bank-run schemes were sold on. The average matured CTF has been worth around £2,000 in HMRC data, but the spread is wide — a £250 voucher never topped up may hold £500-£1,000 in a stakeholder fund, while topped-up equity accounts can exceed £10,000. Our calculator estimates value from the start voucher, monthly top-ups, and an assumed growth rate.

CTF at 18 — Your Four Options

When a Child Trust Fund matures on the holder's 18th birthday, four routes open up. Option one: withdraw as cash. The whole balance is tax-free with no exit penalty — sensible for immediate needs, less so for long-horizon money. Option two: transfer into an adult ISA. Under the matured-CTF rules introduced in 2020 (an amendment to the ISA Regulations), funds moved directly from a matured CTF into an adult ISA do not count toward the £20,000 annual allowance — it is a protected transfer. It must be handled provider-to-provider as a matured-CTF subscription; withdrawing the cash yourself and re-depositing it forfeits the protection and eats your allowance. Not every ISA manager accepts these transfers, so confirm before applying. Option three: do nothing. The balance rolls into a 'protected account' that keeps its tax-free status until you give instructions — but many sit in low-yield holding funds, so inertia has a real cost. Option four: redirect it — into a Lifetime ISA (transfers generally count toward the £4,000 annual LISA limit but attract the 25% bonus, so £4,000 moved earns £1,000) or toward a pension. Worked example: a £2,000 matured CTF transferred into a stocks and shares ISA growing at 6% a year reaches about £3,582 in ten years (£2,000 × 1.06¹⁰) — without touching a single pound of your annual ISA allowance.