The Prize Draw Wearing a Savings Account’s Suit

Premium Bonds have a brilliant trick. They turn a savings account into a lottery, then let you feel sensible about it. Your capital is backed by the Treasury, the prizes are tax-free, and every month there’s a small chance that NS&I will ring your doorbell with a cheque for a million. What’s not to like?

Plenty, if you care about the return rather than the story. The bonds don’t pay interest. They pay prizes. And the prize fund is not a rate you receive; it’s a pool that gets shared out unevenly. The headline number is an average, dragged upwards by a tiny number of giant winners. The typical holder — the person with a few thousand pounds and no lucky streak — lives in the bottom half of that distribution. That’s the bit the marketing department leaves out.

The average is not your average

Start with the odds. NS&I publishes a prize-fund rate and a set of odds per £1 bond. Those odds have been drifting out for years as the prize fund has been trimmed. Whatever the exact figure today, the shape of the maths is the same: for a £1,000 holding, the chance of winning anything in a given month is roughly one in twenty-five. Over a year, that’s about a 39% chance of at least one prize. In other words, a £1,000 holder should expect to win nothing in six years out of ten.

A £5,000 holder has better odds of a prize — around a 91% chance of something over a year — but ‘something’ is usually £25 or £50. The expected return may look close to the prize-fund rate, but the median return is much lower. The mean is a statistical ghost created by the handful of £1m winners. If you are not that handful, you are not getting the mean.

This is not a scandal. It’s how a prize draw works. The scandal is pretending it’s a savings account.

Inflation does the quiet damage

Suppose the prize-fund rate is 3.8%. Suppose CPI is running at 3%. Before tax, the average holder is ahead by 0.8% in real terms. Sounds fine. But if your actual return is half the mean — which is entirely normal for a modest holding — you are at roughly 1.9%, or 1.1% behind inflation. Your capital is safe in nominal terms. Your purchasing power is not.

And the tax-free wrapper is worth less than it sounds. Premium Bond prizes are free of UK income tax, which is a real advantage for higher-rate taxpayers who have already used their personal savings allowance. But for a basic-rate taxpayer with £1,000 of interest allowance, or an ISA user with spare capacity, the tax edge is small. You are giving up contractual interest for a lottery ticket, and calling it prudence.

The comfortable cost of feeling patriotic

There’s a reason Premium Bonds are treated as a national institution. They were launched in 1956, they are backed by the Treasury, and they have a whiff of wartime thrift about them. NS&I is not a high-street bank; it’s the government’s savings arm. That feels safe. But safe capital and a safe return are different things.

Take £10,000. A dull easy-access account paying 4% gives you £400 a year, contractually, with FSCS protection up to the limit. A Premium Bond holding with a 3.8% prize-fund rate gives you an expected £380, but the actual outcome could be £0, £25, £100 or — very occasionally — something enormous. If you would not buy a scratchcard with your emergency fund, why accept a scratchcard return from your savings?

The cost isn’t just the gap between the prize-fund rate and the best savings rate. It’s the gap between the mean and the median. For a typical £5,000 holder, that gap could easily be a hundred pounds a year. Over a decade, it’s a holiday. Over a lifetime of saving, it’s a meaningful chunk of retirement.

The dull alternatives are not exciting. That’s the point.

If you want a home for cash you might need in the next year or two, the alternatives are aggressively boring. FSCS-protected easy-access savings accounts. Short-dated gilts held to maturity. Money market funds, if you understand the plumbing. None of them will make you a millionaire. None of them will send you a letter with a nice font. But they pay you a known rate for lending your money, rather than a variable prize for entering a draw.

Premium Bonds can make sense at the margin. If you are a higher-rate taxpayer who has maxed out ISAs and premium bonds are a tax-efficient home for a slice of cash, fine. If you have £50,000 in there and think of it as your safe money, you are running a lottery with your financial security. The top prize is a marketing device. The median prize is the reality.

The uncomfortable conclusion is simple: Premium Bonds are not a savings account with a lottery ticket attached. They are a lottery with a savings account attached. The capital is safe. The return is not. And the odds just got worse.

If you want to gamble, gamble small and call it gambling. If you want to save, demand a rate.