Millions of people in the UK hold Premium Bonds, the iconic NS&I savings product where instead of interest, you enter monthly prize draws. Prizes range from £25 to £1 million, all tax-free. But with the best savings accounts paying close to Bank Rate (3.75% at the time of writing, October 2026), do Premium Bonds still make sense? Let's do the maths.
How Premium Bonds Work
NS&I issues £1 bonds, each assigned a unique number. Every month, a random draw selects winning bond numbers and pays out prizes tax-free. The prize fund rate (4.35% at the time of writing, October 2026) represents the total prize pool divided by bonds held. But because prizes are random, the 'average' return is just a statistical estimate. You might win more, less, or nothing at all in a given month.
Prize Tiers and Odds
The prize structure ranges from £25 up to £1 million jackpots each month. The vast majority of prizes are £25 or £50. The probability of any £1 bond winning a prize in a given month is 21,000 to 1 at the time of writing (NS&I changes the odds when it changes the prize fund rate). The more bonds you hold, the more 'lottery tickets' you have each month.
- £1,000,000 jackpot prizes each month
- Smaller prizes: £100,000, £50,000, £25,000, £10,000, £5,000, £1,000, £500, £100, £50, £25
- Minimum holding: £25
- Maximum holding: £50,000 per person
Premium Bonds vs Savings Accounts
Here's the honest comparison: the prize fund rate of 4.35% sounds competitive, but it's an average across all bonds, not a guaranteed return, and because a few large prizes pull the average up, most holders win less than that. A savings account's AER, by contrast, is what you actually get. Premium Bonds make mathematical sense mainly if you're a higher or additional rate taxpayer — prizes are tax-free, whereas savings account interest is taxable (though the Personal Savings Allowance covers most basic-rate taxpayers). For basic-rate taxpayers with under £1,000 in annual interest, compare the after-tax rate on a top easy-access account with your likely Premium Bonds return: for most people with modest holdings, the guaranteed account wins. From April 2027 savings interest tax rates rise by 2 percentage points, which makes tax-free prizes slightly more attractive for higher earners.
Are Premium Bonds safe?
Yes — they're backed by HM Treasury, making them as secure as any investment in the UK. Unlike bank deposits, they're not covered by FSCS (they don't need to be — they're government-backed).
How long do I have to hold Premium Bonds?
You can cash them in at any time. There's no lock-in period. Withdrawals typically take 1–3 banking days.
Who Should Hold Premium Bonds?
Premium Bonds suit: higher and additional rate taxpayers who've used their Personal Savings Allowance (all prizes are tax-free), people who enjoy the lottery element, those holding near the £50,000 maximum (law of large numbers makes expected returns more predictable), and anyone who wants a completely safe, accessible place for cash. They're not ideal as your only savings vehicle for smaller amounts where guaranteed returns from a high-interest account are more reliable.
- premium bonds
- NS&I
- savings
- prize fund
- tax-free