Official figures from National Savings and Investments (NS&I) have shattered a long-standing myth about Premium Bonds, showing that the average jackpot winner holds just £35 ,668 — nearly £15,000 below the maximum allowed. The data, covering a decade from July 2016 to June 2026 and provided to The Mail on Sunday, reveals that only 38% of the 240 £1 million winners during that period held the full £50,000. This means more than three in five jackpot winners had less than the maximum saved, including one winner who secured the top prize with just £100.

The £35,668 average : 29% below the maximum

According to the NS&I data, the average Premium Bonds jackpot winner holds £35,668 — a figure that is 29% below the £50,000 cap. This directly contradicts the assumption that Ernie, the computer that runs the draw, favours the maximum holders. The data shows that only 38% of £1 million winners had the maximum, while a full 62% held less. For lower-tier prizes like £100,000 and £50,000, the average holdings were £39,916 and £39,862 respectively, still well below the maximum. As the report notes, just 6.4% of all Premium Bond holders save the full £50,000, yet they account for 38% of the top prizes — a mathematical advantage but far from a guarantee.

One winner with £100: the smallest holding in a decade

The most striking example of a small holding winning big came in March last year, when a winner from Cleveland in North Yorkshire took home the £1 million jackpot with just £100 in Bonds. That is the smallest winning amount in the past decade. The smallest holding ever to win the jackpot was a mere £17 in July 2004, belonging to someone in Newham, east London. These cases underscore the slim but real possibility for small savers. However, the odds remain daunting: with £1 invested, the chance of winning the top prize is one in 68.4 billion; with £50,000, it improves to one in 1,369,552.

Why newer or older Bonds don't matter: a 59-day win vs. six-year average

Another myth the data puts to rest is that newer or older Bonds have a better chance. Analysis over ten years shows that winning Bonds were purchased an average of just under six years before being selected. But one 2018 jackpot winner with £7,500 had held their Bonds for only 59 days before winning. This confirms that the age of a Bond has no bearing on its odds. As the source explains, each £1 Bond is entered into the monthly draw with equal probability, regardless of when it was bought. The randomness is key.

The odds for small savers: 1 in 68.4 billion with £1

The statistical reality is blunt.. With the minimum £25 investment, the chance of winning the £1 million jackpot is one in 2.7 billion. Experts quoted in the report, such as Andrew Hagger of MoneyComms, note: "Simple mathematics mean the larger your holding, the greater your chance of winning but there are no guarantees that you'll win anything." Anna Bowes of Private Office adds: "The chance is less if you haven't got the full amount. but someboy has got to win it — and two people every month do. This is the real appeal of Premium Bonds." The tax-free nature of prizes adds a further layer: to match a 3.8% tax-free return, a basic-rate taxpayer would need 4.75%, a higher-rate taxpayer 6.33%, and an additional-rate taxpayer 6.91%.