What if you could enter a prize draw every month, with a chance to win £1 million — and never lose a penny of the money you put in? That is the promise of Premium Bonds, the UK’s most popular savings product. Issued by National Savings and Investments (NS&I) and backed by HM Treasury, Premium Bonds work like a savings account with a lottery twist: instead of earning interest, your money is entered into a monthly draw for tax-free cash prizes. This guide explains how Premium Bonds work, what you can win, what the odds really are, and whether they are worth it. Please note: Premium Bonds are a savings product, not a lottery ticket, and you must be 16 or over to buy them yourself (parents and guardians can buy them for children under 16).
Table of Contents
- What Are Premium Bonds?
- How Do Premium Bonds Work?
- ERNIE: The Machine That Picks the Winners
- Prizes and Odds
- How to Buy Premium Bonds
- How to Check If You Have Won
- Are Premium Bonds Worth It?
- Watch: Premium Bonds Explained
- Frequently Asked Questions
- Conclusion
What Are Premium Bonds?
Premium Bonds are a savings product from NS&I, the government-backed savings organisation in the United Kingdom. They were launched in 1956, and the first prize draw took place in 1957. Unlike an ordinary savings account, Premium Bonds pay no interest. Instead, every £1 you hold buys one Bond, and each Bond is entered into a monthly prize draw with tax-free cash prizes ranging from £25 to £1 million.
The key difference from a lottery is that you never lose your stake. You can cash in your Premium Bonds at any time and get back exactly what you put in. There is no risk to your capital — your money is 100% backed by HM Treasury. That makes Premium Bonds a savings product first and a prize draw second, which is why they sit in a different category from lottery tickets. Our guide to lottery vs casino and sports betting explains how different forms of gambling and prize-based products compare.
Premium Bonds are enormously popular. NS&I has more than 24 million customers, including over 22 million Premium Bonds holders, and in 2025 alone holders received more than 71.7 million prizes worth £4.95 billion. They are one of the most widely held financial products in the UK.
How Do Premium Bonds Work?
Buying Premium Bonds is simple. You can invest between £25 and £50,000. Each £1 you invest creates one Bond with its own unique number, so someone holding £10,000 has 10,000 individual £1 Bond entries in each monthly draw. The more Bonds you hold, the more chances you have to win — but there is no guaranteed return, and you could win nothing at all for months or even years.
New Bonds must be held for a full calendar month before they become eligible for the prize draw. If you buy Bonds in November, for example, they will first be eligible for the January draw, not the December one. This waiting rule is one of the most common surprises for new buyers, so it is worth remembering.
Instead of interest, the money that would have been paid as interest goes into a prize fund. The size of that fund is set by the prize fund rate, which NS&I reviews regularly against conditions in the wider savings market. From the September 2026 draw, the prize fund rate is 4.35% variable, and the odds of each £1 Bond winning a prize in the monthly draw are 21,000 to 1. The rate is variable, so it can go up or down — NS&I raised it twice in 2026, from 3.30% to 3.80% for the July draw and then to 4.35% for September. The official NS&I Premium Bonds page always lists the current rate and odds.
All Premium Bond prizes are completely free of UK Income Tax and Capital Gains Tax. You do not need to declare them, and they do not count towards your Personal Savings Allowance. That tax-free status is one of the main reasons higher-rate taxpayers like them.
ERNIE: The Machine That Picks the Winners
The winners of the monthly Premium Bonds draw are chosen by a machine called ERNIE — the Electronic Random Number Indicator Equipment. ERNIE has been generating prize-winning numbers since Premium Bonds launched in 1957, and it was invented by a Bletchley Park codebreaker. The modern ERNIE is a computer that generates random numbers, which are then matched against eligible Bond numbers to determine the winners.
The draw takes place on the first working day of each month. Every Bond number has a separate and equal chance of winning, regardless of when it was purchased or how many digits its serial number has. There is no way to improve your chances except by holding more Bonds — and even then, each individual Bond still has the same 21,000 to 1 odds each month.
ERNIE is one of the most famous random number generators in the world, and its job is similar to the draw machines and random number generators used in lotteries. The difference is that ERNIE is picking winners from a list of Bond numbers, not drawing balls from a drum. Our guide to how lottery revenue funds public programmes explains how prize draws and public funding connect in a different way.
Prizes and Odds
Premium Bond prizes are divided into three bands. Roughly 10% of the prize fund goes to higher-value prizes of £5,000 to £1 million, another 10% goes to medium-value prizes of £500 and £1,000, and the remaining 80% goes to lower-value prizes of £25, £50 and £100. Each month there are two £1 million jackpot prizes.
| Prize band | Prize amounts | Share of prize fund |
|---|---|---|
| Higher value | £5,000 to £1,000,000 | About 10% |
| Medium value | £500 and £1,000 | About 10% |
| Lower value | £25, £50 and £100 | About 80% |
The odds are the part most people misunderstand. Odds of 21,000 to 1 per £1 Bond per month sound reasonable — but they mean that a single £1 Bond has only a tiny chance of winning anything in any given month. With £1,000 held, you have 1,000 chances each month, and you would still expect to win nothing in most months. With £50,000 held — the maximum — you would expect to win something most months, but the prizes would usually be £25 or £50. The Which? guide to Premium Bonds puts it plainly: as it is a lottery, you could hit the jackpot or never win a single prize, and your savings will effectively lose value over time to inflation because they earn no interest.
That inflation point matters. Because Premium Bonds pay no interest, money held in them slowly loses buying power if you win nothing. The prize fund rate of 4.35% is an average across all holders — it is not a return you are guaranteed to receive. Some holders win far more than 4.35% in a year; many win nothing at all.
How to Buy Premium Bonds
You can buy Premium Bonds online at nsandi.com, by phone, or by post. You need to be 16 or over to buy them for yourself, and you can invest from £25 up to a maximum holding of £50,000 per person. Parents, guardians and grandparents can buy Bonds for children under 16.
When you buy, you choose what happens to any prizes you win: they can be paid directly into your bank account, or automatically reinvested into more Premium Bonds, up to the £50,000 maximum. Reinvesting is a popular choice, because it increases the number of Bonds you hold and therefore your chances in future draws.
You can cash in your Bonds at any time, in full or in part, and you will get back exactly what you put in. There are no fees and no penalties for withdrawing. That easy access is one of the main advantages over fixed-term savings accounts, which lock your money away. The Raisin guide to Premium Bonds gives a clear step-by-step overview of buying, checking and cashing in.
How to Check If You Have Won
The fastest way to check is the free NS&I Premium Bonds prize checker app, or the prize checker on the NS&I website, where you enter your holder’s number. Results are available the day after the first working day of each month. You can also ask Alexa, using the NS&I skill, whether you have won.
It is worth checking regularly, because unclaimed prizes are surprisingly common. As of the October 2026 draw, there were more than 2.8 million unclaimed Premium Bond prizes worth over £128 million — mostly small prizes belonging to people who moved house, lost their holder’s number, or simply forgot they held Bonds. Old Bonds bought decades ago can still win, so it is worth checking even if you have not thought about them in years.
Are Premium Bonds Worth It?
Premium Bonds suit some savers and not others. They are a good fit if you want absolute security for your money, if you are a higher-rate taxpayer who benefits most from tax-free prizes, if you like the excitement of a monthly draw, and if you can accept that you might win nothing for a long time. They are a poor fit if you need a guaranteed return, if you are holding a small amount (under £1,000, your chances of winning anything in a given year are low), or if beating inflation is your main goal.
A sensible way to use them is as part of a balanced approach: keep your emergency fund in Premium Bonds for the security and the fun of the draw, and keep money you need to grow in an account that pays guaranteed interest. Our guide to lottery budgeting makes the same point about all prize-based spending: set a limit, treat it as entertainment, and never put in money you cannot afford to leave alone.
Remember too that Premium Bonds are not a lottery ticket and not an investment. They will not make you rich, and they will not beat inflation on their own. What they offer is something no other savings product can: the chance — however small — of a life-changing prize, with your money completely safe while you wait.
Watch: Premium Bonds Explained
This video explains how Premium Bonds work, what they pay, and how to buy them:
Frequently Asked Questions
What are Premium Bonds?
Premium Bonds are a UK savings product from NS&I. Instead of paying interest, every £1 you hold is entered into a monthly prize draw with tax-free prizes from £25 to £1 million. Your money is 100% backed by HM Treasury and you can cash it in at any time.
How much can I invest in Premium Bonds?
You can invest from £25 up to a maximum of £50,000 per person. Each £1 buys one Bond, and each Bond is a separate entry in the monthly draw.
What are the odds of winning a Premium Bond prize?
From the September 2026 draw, the odds are 21,000 to 1 for every £1 Bond in each monthly draw, and the prize fund rate is 4.35% variable. Both figures can change, so check the current rate on the NS&I website.
Are Premium Bond prizes tax-free?
Yes. All Premium Bond prizes are free of UK Income Tax and Capital Gains Tax, and you do not need to declare them.
Who is ERNIE?
ERNIE — the Electronic Random Number Indicator Equipment — is the machine that has picked Premium Bond winners since 1957. It generates random numbers that are matched against eligible Bond numbers on the first working day of each month.
Can I lose money with Premium Bonds?
No. You can cash in your Bonds at any time and get back exactly what you put in. The only “loss” is that your money earns no interest, so it can lose buying power to inflation if you win no prizes.
Conclusion
Premium Bonds are a unique mix of saving and prize draw. You buy Bonds at £1 each, from £25 up to £50,000, and every Bond is entered into a monthly draw run by ERNIE, with tax-free prizes from £25 to £1 million and odds of 21,000 to 1 per Bond. Your capital is completely safe and backed by HM Treasury, you can withdraw at any time, and you never lose your stake — but you also earn no interest, and most holders win nothing in most months. For savers who want security with a monthly thrill, and especially for higher-rate taxpayers, Premium Bonds are a genuinely good product. For anyone who needs a guaranteed return, a regular savings account will serve them better. Premium Bonds are a savings product, not a lottery — but like any prize-based product, they work best when you go in with your eyes open and realistic expectations.
Sources: Premium Bonds (NS&I); Premium Bonds (Which?); Premium Bonds explained (Raisin)