Quick answer. NS&I has raised the Premium Bonds prize fund rate to 4.35% from the September 2026 draw. That figure is a pooled average across all bondholders, not a rate paid to you. Most holders win only small prizes, so a typical return is closer to 3.2% than 4.35%.
If you hold Premium Bonds you have probably seen the headline: the prize fund rate is going up again, to 4.35%. It is the second increase this year, and at first glance the number looks competitive with a decent easy access savings account.
The more useful question is a different one. Premium Bonds do not pay interest. They pay prizes, allocated by a monthly draw. So what does a 4.35% prize fund rate actually mean for the money in your account, and how close will you realistically get to it?
What has changed from the September 2026 draw
NS&I confirmed on 18 August 2026 that the Premium Bonds prize fund rate rises to 4.35% from the September 2026 draw, up from 3.80%. The odds on each £1 Bond number winning a prize in any given month shorten to 21,000 to 1, from 22,000 to 1.
In practical terms, NS&I estimates that means around 308,000 more prizes in September than in August, with the total prize pot rising by roughly £63 million to more than £497 million. Over 22 million people hold Premium Bonds, which makes this one of the more widely felt savings changes of the year.
Four other NS&I accounts rose on 18 August 2026 as well, including Direct Saver to 3.75% gross/AER and Income Bonds to 3.69% gross and 3.75% AER. All figures verified on the NS&I website on 24 August 2026.
What the prize fund rate actually measures
This is the part that trips people up. The prize fund rate is not a rate of interest paid to you. It is the value of one month’s prize fund, annualised, expressed as a percentage of every pound held in Premium Bonds by everybody.
It says nothing about what any individual receives, because the money is not shared out evenly. It is allocated by draw, in lumps, from £25 up to £1 million. Your own return is therefore a range of outcomes rather than a number, and because a handful of very large prizes sit inside that average, the average sits above what most people actually get.
What the odds mean in practice
Odds of 21,000 to 1 apply to each individual £1 Bond number, every month. The number of prizes you can expect therefore scales with how much you hold.
Hold £1,000 and you own 1,000 Bond numbers. Across twelve monthly draws that is 12,000 chances at 21,000 to 1, which works out at an expected 0.57 prizes in a year. Run the probability properly and there is roughly a 56% chance of winning nothing at all across a full year.
Hold £10,000 and you own 10,000 Bond numbers, giving an expected 5.7 prizes a year. Far more dependable, but as the next section shows, those prizes are almost always small ones.
What the August 2026 draw actually paid out
NS&I publishes the full prize breakdown for every draw. August 2026 is the most recent completed draw, and the shape of it is worth seeing in full. Almost every prize handed out was £25, £50 or £100, and only two were £1 million.
The pattern is stark. Of 6,224,837 prizes, 6,152,387 were £25, £50 or £100. That is 98.8% of everything paid out. The average prize was about £70, but the median prize, the one sitting in the middle if you lined them all up, was £50.
What a typical holder actually earns
Now combine the two. A £10,000 holding can expect roughly 5.7 prizes a year under the new odds. If those prizes follow the usual distribution and none of them is a big one, which is overwhelmingly the likeliest outcome, the year’s winnings come to about £320.
On £10,000 that is roughly 3.2%, not 4.35%. The gap is not NS&I overstating anything; the gap is the jackpots. The headline rate is only reached across the whole population because a few holders win very large amounts, and by definition most people are not those few. The chart below sets that typical outcome against the headline rate and the other numbers a saver is weighing up.
Set against inflation the picture tightens further. CPI rose by 2.9% in the twelve months to July 2026, up from 2.6% the month before. A typical Premium Bonds holder earning somewhere near 3.2% is barely ahead of rising prices in real terms, and a holder who wins nothing in a given year is going backwards.
Where people get this wrong
Tax free is worth less than it sounds
Premium Bond prizes are free of UK Income Tax and Capital Gains Tax, and that is a real feature. It is just worth checking whether you were ever going to pay tax on savings interest in the first place.
The Personal Savings Allowance lets a basic rate taxpayer earn £1,000 of savings interest a year without tax, and a higher rate taxpayer £500. Additional rate taxpayers get nothing. A basic rate taxpayer earning 4% on savings would need around £25,000 put away before that allowance ran out.
So if you are nowhere near your allowance, the tax free treatment is not buying you anything. If you are an additional rate taxpayer, or you hold large cash balances, it is buying you a great deal.
A prize rate is not a savings rate
An easy access account paying 4.35% pays 4.35%. Premium Bonds carrying a 4.35% prize fund rate pay somewhere between nothing and a life changing sum, averaging out at 4.35% across millions of people. Those are different products even when the number on the tin is identical.
Comparing them sensibly means setting your realistic outcome against the advertised rate on the alternative, not headline against headline.
The safety argument is weaker than it first looks
NS&I is backed by HM Treasury, and Premium Bonds are UK Government securities issued under the National Loans Act 1968. That backing is often called the strongest protection available for cash, and it is excellent. It may simply not be doing much work for you.
The maximum Premium Bonds holding is £50,000 per person, while the Financial Services Compensation Scheme protects eligible deposits with an authorised bank or building society up to £120,000 per person per firm, a limit that took effect on 1 December 2025. Anything you could hold in Premium Bonds would already be covered in full at an FSCS protected bank.
One caveat worth keeping straight: that £120,000 applies to cash deposits. The FSCS limit for investments, which is what a Stocks and Shares ISA falls under, is £85,000 per person per firm.
How Premium Bonds sit next to the alternatives
For most UK savers the comparison set is short, and each option does a different job.
A cash ISA or easy access account
A known rate, interest actually paid, FSCS protection up to £120,000, and inside an ISA the interest is tax free without touching your Personal Savings Allowance. NS&I's own Direct ISA pays 3.80% tax free/AER, verified 24 August 2026.
Premium Bonds
No interest, tax free prizes, full HM Treasury backing and complete capital security in nominal terms, in exchange for a return that is uncertain and for most people below the headline rate.
A Stocks and Shares ISA
No capital security at all and real short term volatility, but historically the strongest long run returns of the three for money you genuinely will not need for at least five years.
The ISA allowance is £20,000 for the 2026/27 tax year across all ISA types combined, so a cash ISA and a Stocks and Shares ISA draw on the same pot. If you are trying to work out what a difference of one percentage point does over a decade, our compound interest calculator will show you, and if you are weighing up where a Stocks and Shares ISA would actually live, the UK broker fees calculator and our InvestEngine review are the practical next steps.
Compare UK investing platforms side by side, on fees and features.
So who are Premium Bonds actually for?
They make most sense in a few specific situations: you have used up your Personal Savings Allowance, you hold more cash than the FSCS limit covers at one institution, or you value the chance of a large prize enough to accept a lower expected return as the price of it.
They make less sense if you are a basic rate taxpayer with modest savings and no allowance problem, where an easy access account or cash ISA will usually pay more and pay it more reliably. And they are not a substitute for long term investing: capital certainty in nominal terms is not the same as protecting your purchasing power.
Frequently asked questions
Key takeaways
4.35% is an average, not your rate
The prize fund rate describes the whole pot across all holders. Your own outcome is a range, and it sits below the average for most people.
Almost every prize is small
In the August 2026 draw, 98.8% of prizes were £25, £50 or £100. Two were £1 million.
A typical £10,000 holding earns nearer 3.2%
Roughly 5.7 prizes a year, almost all small, which is barely ahead of the 2.9% CPI reading for July 2026.
The tax free perk is situational
It matters if you have used your Personal Savings Allowance or hold large cash balances. If not, it may be worth nothing to you at all.
Not sure where a Stocks and Shares ISA should live? Find a broker that fits.
Sources. Prize fund rate, odds, product rates and prize allocation: NS&I, verified 24 August 2026. Consumer Prices Index for July 2026: Office for National Statistics. Bank Rate: Bank of England, held at 3.75% on 30 July 2026. ISA allowance and Personal Savings Allowance: GOV.UK. FSCS limits: Financial Services Compensation Scheme.
The information provided on this page and throughout the website is for general information purposes only and does not constitute financial advice. Investments can fall as well as rise and you may get back less than you put in. Past performance is not a guide to future returns. It is important that you conduct your own research and consider your own personal circumstances before making any investment decisions.
