Premium Bonds are a savings product from National Savings & Investments (NS&I), backed by the UK government. Instead of earning interest, your money is entered into a monthly prize draw. Prizes range from £25 to £1 million, and all winnings are tax-free. About 22 million people hold them, making them one of the most widely held savings products in the country.
How they work
You buy bonds in multiples of £1, with a minimum purchase of £25 and a maximum holding of £50,000 per person. Each £1 bond is a separate entry in the monthly draw, generated by ERNIE (Electronic Random Number Indicator Equipment). Your capital is completely safe — you can cash in your bonds at any time for their face value.
The current prize fund rate is 4.0%, meaning the total amount paid in prizes equals 4.0% of all bonds eligible for the draw. But here's the thing: that rate describes the total prize pool, not what you'll personally earn. Most prizes are £25, and the big wins are extremely rare.
Your actual odds
Each £1 bond has a 1 in 21,000 chance of winning any prize in a given month. With the maximum holding of £50,000, you'd expect roughly 2-3 prizes per month — almost certainly all £25 wins. Over a year, that might total £600-£900, which translates to an effective return of 1.2-1.8%.
The problem is variance. Some months you'll win nothing; occasionally you'll win more. The prize fund rate of 4.0% only applies as a statistical average across all bondholders. Individually, most people earn well below that rate. The lucky few who win £100,000 or £1 million prizes skew the average dramatically upward.
Premium Bonds vs savings accounts
If you're comparing purely on expected returns, a competitive easy access savings account paying 4-5% will beat Premium Bonds for most people. The savings account gives you a guaranteed, predictable return. Premium Bonds give you an unpredictable return with a tiny chance of a life-changing win.
Where Premium Bonds have an edge:
- Tax-free prizes — if you're a higher or additional rate taxpayer who has used up their Personal Savings Allowance and ISA allowance, Premium Bond prizes offer genuinely tax-free returns
- Government backing — your capital is 100% backed by the Treasury, more secure than the FSCS £85,000 limit
- The excitement factor — some people genuinely enjoy the monthly draw
Who should consider Premium Bonds?
They make most sense for higher and additional rate taxpayers with substantial savings who have maxed out their ISA allowance and Personal Savings Allowance. In that situation, a savings account paying 5% might net only 2.75% after 45% tax, making Premium Bonds' tax-free prize fund rate more competitive.
For basic rate taxpayers with savings under £20,000, a Cash ISA or a savings account within the Personal Savings Allowance will almost certainly deliver better returns.
Buying and cashing in
You can buy Premium Bonds online through NS&I's website or app, by phone, or by post. Bonds become eligible for the draw one full calendar month after purchase. Cashing in is straightforward — request the withdrawal online and the money typically arrives in your bank account within a few working days.
Common misconceptions
A few myths worth addressing:
- "Older bonds are more likely to win" — false. Every eligible bond has the same odds regardless of when you bought it.
- "You need at least £10,000 to have a chance" — false. Any bond can win. But with fewer bonds, you might go months or years without a prize.
- "Premium Bonds pay 4%" — misleading. The prize fund rate is 4%, but individual returns vary hugely. Most people earn well below this.