The Shocking Truth About Premium Bonds
Why Premium Bonds Are a Comfort Product, Not an Investment
Dear reader,
I was sitting in a couple of client meetings recently, reviewing what most people would recognise as fairly “normal” retail investment portfolios. The only thing that wasn’t normal was the size of some of them these were clients with serious sums of money.
What genuinely stopped me in my tracks was how much of that capital was sitting in Premium Bonds.
Now, before you head straight to the comments to defend Premium Bonds, this article isn’t an attack on safety, tax efficiency, or even peace of mind. I’m deliberately approaching this from a single angle: return on capital.
Premium Bonds have quietly become one of the most common holdings in UK portfolios, often by default rather than by design. In this piece, I want to examine why so many investors, including those with substantial wealth, hold large balances in Premium Bonds, and why, for the average UK investor, there are often far better places for that money to be working.
What Premium Bonds Actually Are (and Aren’t)
Premium Bonds are issued by National Savings & Investments (NS&I) and backed by the UK government. That means your capital won’t be lost, a comforting fact for many investors. But that’s where the similarity with savings accounts ends.
Here’s the reality:
No interest or guaranteed yield: You only receive money through random prizes.
Each £1 bond enters a monthly draw: Odds are roughly 1 in 24,500 per £1 bond per month (as of early 2026).
Headline “prize fund rate”: NS&I currently quotes about 3.60–3.80%, but this is an average across all bonds, not a guaranteed return.
At face value, Premium Bonds seem attractive: the chance of winning a prize tax-free, backed by the government, and headline returns above traditional cash ISAs. But the key is in the details.
The Reality of Returns
The advertised “prize fund rate” of Premium Bonds is often cited as 3.6–3.8%, but this figure can be misleading. It is simply an average calculated across all bondholders, not a guaranteed yield. In reality, the distribution of returns is extremely uneven, and most investors experience outcomes far below the headline rate.
Most holders win little to nothing. Millions of bonds are in circulation, yet the distribution of prizes is heavily skewed. A small fraction of investors account for a disproportionate share of the winnings, meaning the “average” is inflated by a few large prizes. Many bondholders may go years without winning anything at all. According to NS&I statistics, over half of all bondholders do not win a single prize in a typical year.
Median returns are significantly lower than the advertised rate. While some investors might “beat the odds” and receive a payout higher than 3.6%, the median return, the point where half of investors earn less and half earn more, is closer to 1–2% per year. This means that, for the majority, the effective yield is substantially below alternative safe investments such as cash ISAs or fixed-rate bonds.
Opportunity cost is substantial. Money sitting in Premium Bonds is not earning compound growth elsewhere. Even modest-risk alternatives offer far better long-term outcomes:
A cash ISA paying 4% annually grows £10,000 to roughly £14,802 over 10 years.
A dividend-focused UK equity portfolio returning 6–8% could grow the same £10,000 to £17,908–£21,589. For example our Fund with an 8% yeild:
A low-cost FTSE 100 tracker ETF at 7% growth compounds the same capital to nearly £19,671 over 10 years.
By comparison, Premium Bonds with median returns around 1–2% would see £10,000 grow to just £11,046–£12,189 over the same period. Even if you “get lucky” and win a few prizes, this is far from guaranteed, and the long-term compounding effect of higher-yielding alternatives cannot be understated.
The hidden cost isn’t volatility, it’s lost growth. Unlike stocks or property, Premium Bonds carry virtually no nominal risk. But the trade-off is clear: low risk comes at the expense of potentially substantial, predictable returns elsewhere. For investors aiming to build wealth, rely on investment income, or fund retirement, this opportunity cost can be profound.
Premium Bonds function as a government-backed lottery: safe in principle, but structurally designed so that most investors underperform relative to almost every alternative. For serious capital growth, relying heavily on Premium Bonds is rarely the optimal choice.
Safety vs. Performance
Premium Bonds are unquestionably safe: your capital is secure, and there’s no risk of nominal loss. This “peace of mind” factor is attractive to some investors, particularly those who are risk-averse or nearing retirement.
However, safety comes at a cost: lost returns. Holding large sums in Premium Bonds may feel secure, but it also locks up capital that could be generating predictable growth through cash ISAs, dividend-paying equities, or diversified low-cost index funds.
When Premium Bonds Make Sense
Premium Bonds are not inherently “bad.” They can have a place in a portfolio:
Short-term liquidity: You can withdraw your money at any time without penalty.
Emergency fund component: A small portion of your cash could sit here if you value total security.
Fun factor: Some investors enjoy the “lottery” element, particularly for smaller balances.
But for investors whose goal is wealth growth or income generation, Premium Bonds rarely deliver. Even conservative dividend portfolios or cash ISAs now provide better returns with comparable safety (particularly if you use NS&I’s other products like Guaranteed Income Bonds).
Safe to say, I won’t be buying Premium Bonds… I’ve built a portfolio that yields over 8% per year, giving my money the growth and compounding Premium Bonds can only dream of.
Thanks for reading,
Ollz
The information provided in this article is for informational purposes only and reflects my personal opinions and analyses. It should not be considered financial advice or a recommendation to buy or sell any securities. Investing in the stock market involves risks, and past performance is not indicative of future results. Readers are encouraged to conduct their own research and consult with a qualified financial advisor before making any investment decisions. I do not assume any responsibility for any financial losses or consequences that may arise from reliance on the information provided