Premium bonds are a savings product from National Savings & Investments (NS&I), backed by the UK government. Instead of paying interest, each £1 bond you hold is entered into a monthly prize draw. Prizes are tax-free, and your capital is 100% secure.
Whether they’re worth holding depends on how the prize rate compares to savings account interest rates — and how much you care about the lottery element versus a guaranteed return.
How Premium Bonds Work
- Each £1 buys one bond and one entry into the monthly prize draw
- You can hold between £25 and £50,000 in premium bonds
- Prizes range from £25 to £1 million, drawn each month
- All prizes are completely tax-free
- Your original investment is 100% safe — you can withdraw at any time
- There’s no interest — the only return is prize money
NS&I sets a “prize rate” — currently around 4.4% (as of mid-2024, though this changes periodically). This is the annualised equivalent rate of prizes paid out relative to the total amount held in bonds. It means that on average across all bondholders, £10,000 in bonds would win approximately £440 in prizes per year.
The Problem with Averages
The prize rate is an average — but individual outcomes vary enormously. Most bondholders win less than the average rate because prize distribution is highly skewed by the large prizes.
How the odds work (approximate, based on recent prize rates):
– Odds of winning any prize in a given month: approximately 1 in 21,000 per £1 bond
– Odds of winning £25 per bond per month: roughly 1 in 21,000
– Odds of winning £1 million: roughly 1 in 58 billion per bond
If you hold £10,000 in bonds:
– Average outcome: Approximately £440/year
– Median outcome: Significantly below average due to the skew of large prizes
– Guaranteed outcome: £0 in prizes per month (you might win nothing for a year)
This is the fundamental trade-off: the average return is equivalent to a competitive savings account, but individual outcomes are unpredictable.
Are Premium Bonds Worth It?
Compared to a savings account:
At current prize rates (approximately 4.4%), premium bonds compare reasonably to easy-access savings accounts. But savings accounts guarantee their interest rate; premium bonds don’t guarantee any prizes.
For a basic rate taxpayer with under £1,000 in savings interest annually (covered by the Personal Savings Allowance), a savings account paying 4.5–5% beats premium bonds on expected value, because the guaranteed rate exceeds the premium bond prize rate and your interest is already tax-free up to the PSA.
For a higher or additional rate taxpayer with significant savings above the PSA, the tax-free nature of premium bond prizes becomes more valuable. If your savings interest is already fully taxable (40–45%), a premium bond prize rate of 4.4% tax-free competes with a savings account paying approximately 7–8% before tax at the 40% rate.
The verdict by situation:
| Taxpayer | Savings interest taxable? | Premium bonds vs savings |
|---|---|---|
| Basic rate, small savings | No (within PSA) | Savings account wins |
| Basic rate, large savings | Yes (above PSA) | Close — compare specific rates |
| Higher rate | Yes | Premium bonds competitive |
| Additional rate | Yes | Premium bonds very competitive |
Who Premium Bonds Suit Best
- Higher and additional rate taxpayers with significant savings above the PSA
- People who already have ISA allowances filled and can’t shelter more in a cash ISA
- People who enjoy the lottery element — the chance of a large prize, however small, has genuine appeal beyond the expected value calculation
- People who want security — premium bonds are backed by HM Treasury; your capital is safer than even FSCS-protected savings (which covers up to £85,000 per institution)
The Maximum Holding and the Luck Factor
With the maximum £50,000 in premium bonds, your expected annual prize money is approximately £2,200 at the 4.4% prize rate. But a significant minority of maximum holders win substantially more (via £25,000 or £100,000 prizes) and many win substantially less.
A NS&I calculator on their website lets you estimate the probability of winning different amounts based on your holding — it’s worth running before deciding.
How to Buy Premium Bonds
Premium bonds are available exclusively from NS&I:
– Online at nsandi.com
– By phone (08085 007 007)
– Via NS&I’s mobile app
There’s no intermediary — you deal directly with NS&I. They’re straightforward to buy and straightforward to withdraw from (withdrawals take 3 working days).
Summary
Premium bonds are a legitimate savings option — but whether they’re right for you depends on your tax situation:
- Prize rate ≈ 4.4% (tax-free) — competitive but not guaranteed for any individual
- Basic rate taxpayers with small savings are usually better off with a high-rate savings account covered by the PSA
- Higher rate taxpayers with significant savings benefit most from the tax-free prize structure
- Capital is 100% safe — government-backed, no limit, no FSCS cap
- The lottery element is real — if the chance of a large prize (while preserving your capital) appeals, that’s a valid reason to hold them alongside other savings
Next read: Best cash ISA rates UK | https://moneyunpacked.com/best-cash-isa-rates-uk/