What are Premium Bonds?
Premium Bonds are a savings product issued by National Savings & Investments (NS&I), which is backed by HM Treasury. Rather than earning interest on your money, each £1 bond you hold is entered into a monthly prize draw. Prizes range from £25 up to the jackpot of £1 million, and all winnings are completely tax-free.
You can invest between £25 and £50,000 in Premium Bonds. Your capital is 100% secure because NS&I is backed by the UK government, meaning your money is protected regardless of the amount — unlike bank accounts where the Financial Services Compensation Scheme (FSCS) only covers £85,000 per institution.
How does the prize draw work?
Every month, NS&I's random number generator — known as ERNIE (Electronic Random Number Indicator Equipment) — selects winning bond numbers. Each £1 bond has an equal chance of winning, so the more bonds you hold, the better your odds.
The odds of any single £1 bond winning a prize in a given month are currently around 21,000 to 1. This means that statistically, for every £21,000 you hold, you might expect to win one £25 prize per month — though in reality, prizes are random and not guaranteed.
The prize fund rate
NS&I sets an annual prize fund rate which determines the total amount distributed in prizes each month. This rate fluctuates with interest rates and is currently around 4% to 4.4%. However, this is an average across all bondholders, and because the largest prizes are extremely rare, most people receive less than this headline rate in actual winnings.
Prize tiers
Each monthly draw distributes prizes across several tiers:
- £1,000,000 — two jackpot prizes per month
- £100,000 — a handful of high-value prizes
- £50,000 — slightly more common than the jackpot
- £25,000, £10,000, £5,000, £1,000, £500 — progressively more winners
- £100 and £50 — thousands of smaller prizes
- £25 — the vast majority of prizes awarded
In practice, most winners receive the minimum £25 prize. The median return for a typical holder is significantly below the headline prize fund rate.
Are Premium Bonds worth it?
Whether Premium Bonds are worth it depends on your financial situation, tax position, and what you want from your savings. There are clear advantages and disadvantages to consider.
Advantages of Premium Bonds
- Tax-free prizes — all winnings are free from Income Tax and Capital Gains Tax, which is particularly valuable for higher-rate and additional-rate taxpayers who have used their Personal Savings Allowance
- 100% capital security — backed by HM Treasury, so no risk of losing your money
- No limit on FSCS-style protection — unlike bank accounts, the full £50,000 maximum is government-backed
- Easy access — you can withdraw your money at any time, typically within a few working days
- Chance of a large prize — while unlikely, there is always the possibility of winning £1 million
Disadvantages of Premium Bonds
- No guaranteed return — you could hold bonds for months without winning anything
- Returns skewed by large prizes — the headline rate is misleading because most holders earn well below it
- Inflation risk — if your bonds return less than inflation, your money loses purchasing power over time
- Opportunity cost — the money could potentially earn more in a savings account, ISA, or investment
- Not suitable for long-term growth — Premium Bonds do not compound, so they underperform over longer periods compared to investments
Premium Bonds vs savings accounts
In the current interest rate environment, easy-access savings accounts and fixed-rate bonds are offering competitive rates that often exceed what most Premium Bond holders actually receive. A basic-rate taxpayer can earn up to £1,000 in savings interest tax-free each year through the Personal Savings Allowance, while higher-rate taxpayers get £500.
If you have not used your Personal Savings Allowance, a high-interest savings account will likely outperform Premium Bonds for most people. However, if you are a higher-rate taxpayer who has already used their allowance, Premium Bonds become more attractive because the prizes are completely tax-free.
Key consideration: Premium Bonds tend to be most worthwhile for higher-rate and additional-rate taxpayers with savings above their Personal Savings Allowance, where the tax-free advantage outweighs the potentially lower average return.
Premium Bonds vs ISAs
Cash ISAs also provide tax-free returns, and in 2025/26 you can save up to £20,000 per year in ISAs. If you have not used your ISA allowance, a Cash ISA offering a competitive rate may provide a more reliable tax-free return than Premium Bonds. Stocks and Shares ISAs offer even greater growth potential over the long term, though with the risk of losing capital.
Premium Bonds sit alongside ISAs as a tax-efficient savings option rather than replacing them. Many savers use both — ISAs for reliable, tax-free growth and Premium Bonds for secure, tax-free savings with the excitement of the monthly draw.
Who should consider Premium Bonds?
Premium Bonds work best for certain types of savers:
- Higher-rate and additional-rate taxpayers who have exhausted their Personal Savings Allowance and ISA allowance
- Cautious savers who prioritise capital security above all else
- Those with large cash holdings who want government-backed protection beyond the £85,000 FSCS limit
- Savers who enjoy the prize draw element and are comfortable accepting potentially lower average returns for the chance of a bigger win
How to buy and manage Premium Bonds
You can buy Premium Bonds online through the NS&I website, by phone, or by post. The minimum purchase is £25, and you can hold up to £50,000. New bonds become eligible for the prize draw in the calendar month after purchase.
You can check whether you have won prizes through the NS&I prize checker online, or by downloading the NS&I app. Unclaimed prizes remain in the system and can be claimed at any time — there is no expiry date. NS&I estimates that billions of pounds in prizes remain unclaimed.
Cashing in Premium Bonds
You can cash in some or all of your bonds at any time. The money is typically returned to your nominated bank account within a few working days. There are no exit fees or penalties. When you cash in bonds, they are removed from future prize draws.
Should Premium Bonds be part of your savings strategy?
Premium Bonds can play a role in a diversified savings strategy, but they should rarely be your only savings vehicle. For most people, the best approach is to use your ISA allowance first, then your Personal Savings Allowance through a competitive savings account, and consider Premium Bonds for any surplus cash where the tax-free benefit and government backing add genuine value.
If you are unsure how to structure your savings for maximum return and tax efficiency, speaking to a qualified savings and investments adviser can help you create a strategy tailored to your circumstances. Nesto can match you with a suitable adviser — completely free and with no obligation.