What this guide covers
Premium Bonds are NS&I-issued lottery-style savings. £25 minimum, £50,000 maximum per holder. No income tax on prizes. Each £1 bond is one entry into the monthly prize draw. The prize fund rate (essentially the average return) is around 4.0% in 2026 — but the distribution is wildly uneven. Most small holders win £0 most months. Below ~£10,000, a Cash JISA usually returns more reliably.
What Premium Bonds are
NS&I Premium Bonds are issued by National Savings and Investments, an HM Treasury executive agency. Every £1 of bonds you hold is one entry into the monthly prize draw.
The prize fund rate is set by NS&I (and adjusted in line with Bank of England base-rate moves). The "rate" represents the average winnings if you held the median portfolio — but the actual outcome is binary: either you win a prize (£25, £50, £100, £500, £1k, £5k, £10k, £25k, £50k, £100k, £1m) or you don't.
How children's Premium Bonds actually work
The rules for children differ from adult bonds:
- Bonds can be bought for any child under 16
- Only a parent, legal guardian, or grandparent can buy them
- A grandparent who buys must nominate a parent as the "registered holder" until the child is 16 — the parent has control, not the grandparent
- Prizes are paid into the registered holder's bank account or used to buy more bonds
- At age 16, control transfers automatically from the registered parent to the child
- At 16+, the bonds are in the child's name like any adult account
The honest expected-return maths
The prize fund rate (~4% in 2026) sounds attractive. But the distribution of prizes means most small holders win nothing in most months.
| Premium Bonds held | Typical annual prizes | Effective annual return |
|---|---|---|
| £100 | £0 most years | ~0% (median holder) |
| £500 | ~£0–£25 | 0–5% |
| £1,000 | ~£25 | ~2.5% |
| £5,000 | ~£175 | ~3.5% |
| £10,000 | ~£375 | ~3.75% |
| £25,000 | ~£950 | ~3.8% |
| £50,000 (max) | ~£1,950 | ~3.9% |
The estimates above are median outcomes. The distribution is heavily skewed: most holders win less than the median, a few win much more. The £1m monthly jackpot is real, but the odds of any £1 bond winning it are around 1 in 60 billion.
For comparison: a 2026 Cash JISA at 4.5% AER on £1,000 earns a guaranteed £45/yr. Premium Bonds with the same £1,000 typically earn £25 with a long tail of outcomes from £0 to £1,000,000.
When Premium Bonds actually make sense
- You've already maxed the JISA. Once £9,000/yr is in tax-protected wrappers, the next £1,000–£5,000 in NS&I tax-free is still legitimate. The £50,000 holder cap is generous.
- The child holds a meaningful balance (£10,000+). At that level, the law of large numbers kicks in and the return approximates the prize fund rate.
- The "lottery ticket" psychology has value. Some families enjoy the monthly check-in. Educationally, watching the draw together is a useful conversation about randomness and expected value.
- You want absolute capital safety with no fees. NS&I is 100% government-backed, no FSCS limit, no platform fees.
- Inheritance considerations. Once gifted, Premium Bonds are out of the giver's estate after the 7-year rule (see inheritance guide).
When they don't: as the only savings vehicle for a child, especially below £5,000. The JISA wins on guaranteed return, the Junior SIPP wins on tax relief.
Practical setup
Buy online at nsandi.com or by phone or post. You need:
- The child's full name, date of birth and address
- The registered holder's (parent's) NS&I customer number or details to register
- UK bank details for prize payments
Set up the prize handling option: NS&I can either pay prizes into your bank account or automatically reinvest them as more Premium Bonds. For a child saving for the long term, reinvest is the standard choice.
Track winnings via the NS&I prize checker app or by post (you can register for monthly email updates). When the child reaches 16, they take over the account — help them set up online access on or shortly before their birthday.
UK Tax Drag (2026). Premium Bonds for children — how they really work. Parent guide. Available at: https://kids.uktaxdrag.co.uk/parent-premium-bonds-for-children.html
Curriculum mapping: see UK Financial Education Curriculum Map (Version 1.0). CC BY 4.0.