Premium Bonds Explained: How the NS&I Prize Draw Works

Premium Bonds are one of the UK's best-loved savings products, but they work unlike any ordinary account — instead of earning interest, you're entered into a monthly prize draw for the chance to win tax-free cash.

Premium Bonds are a savings product from NS&I. Rather than paying interest, every £1 bond you hold is entered into a monthly draw to win tax-free prizes from £25 up to £1 million. You can hold between £25 and £50,000, and your original money is always safe and can be withdrawn at any time.

Try the calculator below to see roughly what a given holding might win in a typical year, then read on for how the odds work and how Premium Bonds stack up against a savings account.

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Key Takeaways

• Premium Bonds pay no interest — instead each £1 bond is entered into a monthly prize draw with tax-free winnings.
• The prize-fund rate is currently around 4%, but that's an average across all bondholders, not a return you're guaranteed to get.
• You can hold from £25 up to a maximum of £50,000, and your capital is fully backed by the Treasury.
• They can suit savers who value security and the fun of the draw, but many will earn more predictable returns in a top savings account or ISA.

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How Premium Bonds Work

Premium Bonds are run by National Savings and Investments (NS&I), which is backed by HM Treasury — so every penny you put in is as safe as savings can be. But they don't work like a savings account.

Each £1 you invest buys one bond, and each bond is a separate entry into a monthly prize draw. The more bonds you hold, the more entries you have. Instead of paying everyone interest, NS&I pools what would have been the interest and pays it out as prizes.

You buy in blocks — the minimum is £25 — and you can cash bonds in whenever you like, with your original money returned in full. There's no fixed term and no penalty for withdrawing.

The Monthly Prize Draw

Every month, NS&I's computer — famously nicknamed ERNIE (Electronic Random Number Indicator Equipment) — randomly generates winning bond numbers. Prizes range from £25 at the low end up to two £1 million jackpots each month, with many amounts in between.

Winnings are completely tax-free and don't count towards your Personal Savings Allowance. You can choose to have prizes paid straight to your bank account or automatically reinvested into more bonds (up to the £50,000 limit).

Understanding the Odds

This is where Premium Bonds differ most from a savings account. The current odds are roughly 1 in 22,000 for each £1 bond to win any prize in a given monthly draw.

Those odds combine into what NS&I calls the prize-fund rate, currently around 4%. But that figure is crucial to understand: it's an average across all bondholders. Because a handful of large prizes skew the average, a typical saver with average luck is likely to win a bit less than the headline rate suggests — and many will win nothing in a given month, especially with a small holding.

Do bigger holdings improve your chances?

Yes. With more bonds you have more entries, so your results are more likely to track the average prize-fund rate over time. Someone holding the full £50,000 has a realistic chance of winning something most months, whereas a £100 holding could go a long time with no prize at all.

Pros and Cons vs a Savings Account

Weighing Premium Bonds against a standard account or cash ISA helps set expectations.

In favour of Premium Bonds:

• Prizes are entirely tax-free, useful if you've used up your Personal Savings Allowance
• Your capital is 100% secure, backed by the Treasury
• There's the small but real thrill of a life-changing win
• Easy access — cash in at any time

Against Premium Bonds:

• No guaranteed return; you could earn nothing at all
• The "rate" is an average, so most savers with typical luck earn less than it implies
• Inflation can erode the value of money that wins little or nothing
• A competitive easy-access savings account or ISA may pay a more reliable return

You can compare against a guaranteed rate using our savings calculator, and if tax on interest is a concern, our income tax calculator can help you see where you stand.

Who Premium Bonds Suit

Premium Bonds tend to work best for people who already have savings elsewhere, have used up their tax-free allowances, and like the idea of a flutter without risking their capital. They're also popular as a gift — you can buy them for children, with a parent or guardian holding them until the child turns 16.

If you're relying on your savings to grow steadily — for a house deposit or a specific goal — a predictable interest rate from a savings account or ISA is usually the more dependable choice.

Frequently asked questions

Are Premium Bond prizes really tax-free?

Yes. All Premium Bond winnings are free of income tax and capital gains tax, and they don't use up your Personal Savings Allowance. That's part of their appeal for higher earners who've already used their tax-free interest allowance.

Can I lose money with Premium Bonds?

Your original capital is completely safe and returned in full when you cash in. The risk is that you win little or nothing, so inflation gradually reduces what your money can buy — an "opportunity cost" rather than a direct loss.

How do I claim a Premium Bond prize?

NS&I notifies winners and can pay prizes directly to your bank account or reinvest them automatically. You can also check for wins any time using the official prize checker on the NS&I website or app.

Is there a maximum I can hold in Premium Bonds?

Yes. The maximum holding is £50,000 per person. Once you reach that limit you can't buy more, though you can keep any prizes you choose to have paid out rather than reinvested.

General information only, not financial advice. ISA and savings rules can change — check gov.uk before acting.