Premium Bonds are one of the most well-known savings products in the UK. Offered by National Savings and Investments (NS&I), which is backed by the government, they work differently from any other savings account — instead of earning interest, your money is entered into a monthly prize draw where you can win tax-free cash prizes ranging from £25 to £1 million.
But are Premium Bonds actually worth it? The answer depends on your personal circumstances, your tax position, and how you compare the odds of winning against what you could earn in a conventional savings account.
How do Premium Bonds work?
When you buy Premium Bonds, each £1 you invest becomes a bond with a unique number. Every month, NS&I holds a prize draw using a random number generator called ERNIE (Electronic Random Number Indicator Equipment). Each bond number has an equal chance of winning in every draw — your odds do not improve the longer you hold bonds.
The minimum investment is £25 and the maximum is £50,000 per person. You can buy bonds for yourself or as a gift for a child. Your original capital is completely safe — you can get it back at any time, and it is 100% backed by HM Treasury, meaning there is no risk of losing your money.
Prizes range from £25 to £1 million and are completely tax-free. You do not need to declare Premium Bond winnings on a tax return, regardless of how much you win.
What are the odds of winning?
NS&I sets a prize fund rate — the total amount paid out in prizes each month as a percentage of the total bonds held — and reviews it periodically. This rate determines the odds of any individual bond winning a prize in a given month.
Importantly, the prize fund rate is not the same as the interest rate on a savings account. Because prizes are distributed unevenly — with the vast majority of the fund going to small prizes and a tiny fraction to the large prizes — your personal return will vary considerably depending on whether you win anything at all.
In any given month, most bondholders win nothing. Over a full year, a bondholder with £50,000 (the maximum) would statistically expect to win a number of prizes, but someone with £1,000 might win nothing at all in a year. The larger your holding, the more reliably your returns approach the headline prize fund rate — but even then, there is no guarantee.
You can check the current prize fund rate and odds at nsandi.com, as these change periodically.
Are Premium Bonds worth it compared to a savings account?
The key comparison is between the expected return from Premium Bonds and the guaranteed return from a savings account. Here is how to think about it:
If you are a basic rate taxpayer
Basic rate taxpayers have a Personal Savings Allowance of £1,000 per year — meaning the first £1,000 of savings interest is tax-free anyway. For most people with moderate savings, a competitive easy-access savings account or fixed-rate bond will likely outperform Premium Bonds on a like-for-like basis, because the savings account offers a guaranteed return rather than a lottery-style distribution.
If you are a higher or additional rate taxpayer
Higher rate taxpayers have a PSA of only £500, and additional rate taxpayers have no PSA at all. For these savers, the tax-free nature of Premium Bond prizes becomes more valuable, since savings interest above their PSA is taxed at 40% or 45%. In this scenario, Premium Bonds may compare more favourably to taxable savings accounts.
If you have already used your ISA allowance
If you have maxed out your ISA allowance for the year and are looking for a home for additional savings, Premium Bonds offer a tax-free alternative worth considering — particularly if you are in a higher tax bracket.
The advantages of Premium Bonds
- 100% capital security — your money is backed by HM Treasury, with no limit on protection (unlike the £85,000 FSCS limit on bank deposits)
- Tax-free prizes — winnings are completely free from income tax and capital gains tax
- Instant access — you can withdraw your money at any time, usually within a few working days
- The chance of a life-changing win — the £1 million jackpot, while extremely unlikely, is a real possibility
- No minimum term — there is no penalty for withdrawing early
The disadvantages of Premium Bonds
- No guaranteed return — you could hold bonds for a year and win nothing at all
- Returns are unpredictable — your actual return depends entirely on luck
- Smaller holdings may underperform — with £1,000 or less invested, the statistical likelihood of winning in any given month is low
- Prize fund rate can be cut — NS&I can reduce the prize fund rate at any time, reducing expected returns
- No interest compounding — prizes must be reinvested manually if you want them to generate further returns
How to check if you have won
NS&I notifies winners automatically — by bank transfer for prizes of £50 and above, and by warrant (similar to a cheque) for £25 prizes. You can also check whether you have won using the NS&I prize checker at nsandi.com or via the NS&I app. Unclaimed prizes are held for 12 months.
Who are Premium Bonds best suited for?
Premium Bonds tend to work best for people who have already used their ISA allowance, higher and additional rate taxpayers who want tax-free returns, people who want complete capital security with government backing, and those who enjoy the element of a monthly prize draw. They are generally less suitable as a primary savings vehicle for basic rate taxpayers with modest savings who would benefit more from a straightforward high-interest savings account.