How do Premium Bonds work?

This popular savings product from NS&I operates differently to a typical account. We look at how Premium Bonds work.

Money going into golden piggy bank
(Image credit: Getty Images)

Premium Bonds are one of the country’s favourite savings products, with around £128 billion invested in them. They differ from regular savings accounts insofar as they don’t pay a guaranteed interest rate. Instead, bondholders are entered into a monthly prize draw where they can win prizes worth up to £1 million.

The scheme was launched by National Savings & Investments (NS&I) in 1957 as a way of helping people start a good savings habit. Since then, 731 million prizes have been awarded in total worth more than £34 billion.

The top prize hasn’t always been £1 million – this was first introduced in 1994. Since then, there have been 544 jackpot winners. Two new bondholders were welcomed into the millionaire club this morning through December’s Premium Bond prize draw, and will have received a visit from Agent Million.

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Don’t despair if you haven’t had a knock at the door, though, as you could still be in with a chance of a pre-Christmas windfall. Lots of smaller prizes are up for grabs each month too, worth between £25 and £100,000. Runners up will be able to check from tomorrow to see if they have won anything. Over 5.8 million prizes were awarded in December’s draw, worth almost £442 million in total.

We look at how Premium Bonds work and whether they are worth investing in. Here’s everything you need to know.

How do Premium Bonds work?

NS&I Premium Bonds are a savings product that's backed by the UK government. The unique appeal of the product is that it gives you the opportunity to save money while participating in a monthly prize draw.

Prizes start at £25 and go up to £1 million, with two people becoming millionaires each month. These prizes are similar to the interest you would earn on a deposit in a traditional savings account. The main difference is that returns aren't guaranteed, and anything you do win is tax-free.

Each £1 bond comes with a unique number and represents a chance to win a prize. Every single bond has an equal chance of winning. But, the more bonds you hold, the greater your chances of receiving a prize.

One of the most appealing aspects of Premium Bonds is the security they offer. As the UK government backs them, the investment is considered to be risk-free and the amount you have invested is always secure.

How much can I invest?

The maximum you can hold in Premium Bonds is £50,000. The minimum is £25. You can buy bonds through the NS&I website, over the phone or by post.

To apply over the phone, call NS&I for free on 08085 007 007. To apply by post, print and complete an application form and return it with a cheque payable to NS&I. Further instructions and the application form can be found on the NS&I website.

It is also possible to buy Premium Bonds for a child. Until the child’s 16th birthday, the parent or guardian named on their application looks after their bonds, regardless of who bought them.

How much can I earn?

There is no guaranteed return or regular income with Premium Bonds. Instead, you are entered into a monthly prize draw where you can win between £25 and £1 million.

You may have heard of the prize fund rate. This benchmark is used by NS&I to set how many prizes should be given away every month. The figure you see is an average rate for someone with average luck.

Some people will earn more, especially if they scoop a big prize, while others will win nothing. It’s important not to get the figure confused with a conventional interest rate that you would see on a typical savings account.

The Premium Bond prize fund rate currently sits at 4.15%, having fallen in recent months after peaking at 4.65%. It is set to fall again to 4% from January’s draw. As well as the prize fund rate, NS&I also publishes the odds of winning. The odds are currently 22,000 to 1 for every £1 bond.

Are Premium Bonds right for me?

Swapping a guaranteed interest rate for the chance of winning a prize might not appeal to everyone, but Premium Bonds can act as a useful diversifier within a wider portfolio.

Every penny spent on Premium Bonds is backed by the government. For this reason, many investors put considerable amounts into NS&I products. The more bonds you hold, the greater your chances of winning a prize.

The tax-free status of the prizes is also appealing for any savers worried about busting their personal savings allowance and having to pay tax on their returns. This is particularly the case for higher-rate and additional-rate taxpayers with large amounts of cash savings.

If you like the idea of winning big but are also comfortable with winning nothing at all, then Premium Bonds could be right for you. Alternatively, if you want a guaranteed level of interest and the certainty that your savings will stay ahead of inflation, then it’s probably best to avoid them.

How are the prizes drawn?

Much like how lottery balls are drawn from a machine, NS&I has its own computerised random number generator, ERNIE. This Electronic Random Number Indicator Equipment has generated the numbers used in draws since 1957. ERNIE is currently on his fifth iteration and is more high-tech than ever.

ERNIE 5 is powered by quantum technology, which uses light to run the sums far quicker than a conventional computer. It takes 12 minutes for ERNIE to generate the random numbers for a prize draw.

How do I find out if I’m a winner?

Once ERNIE has done his magic, the winners are notified through a variety of channels. Jackpot winners usually find out on the first working day of the month, and winners of the runner-up prizes can usually check one day later.

Two of the easiest ways to check for Premium Bond prizes are the online NS&I prize checker and the official prize checker app, available on either Android or iOS. We share further details in: “How to check for Premium Bonds”.

Who is Agent Million?

If you are a £1 million winner, you will get a knock on the door from Agent Million. The elusive millionaire-maker is actually one of a number of anonymous NS&I employees whose job is to track down the lucky winners who have scooped the top prize.

Winning that kind of money can be life-changing, and Agent Million is there to ensure the winner has all the information they need to manage their newfound wealth carefully in the days and weeks after the win.

Katie Williams
Staff Writer

Katie has a background in investment writing and is interested in everything to do with personal finance, politics, and investing. She enjoys translating complex topics into easy-to-understand stories to help people make the most of their money.

Katie believes investing shouldn’t be complicated, and that demystifying it can help normal people improve their lives.

Before joining the MoneyWeek team, Katie worked as an investment writer at Invesco, a global asset management firm. She joined the company as a graduate in 2019. While there, she wrote about the global economy, bond markets, alternative investments and UK equities.

Katie loves writing and studied English at the University of Cambridge. Outside of work, she enjoys going to the theatre, reading novels, travelling and trying new restaurants with friends.

With contributions from