Premium bonds holders urged to check overlooked inflation rule
Premium Bonds holders are being urged to review an overlooked rule: while NS&I protects your capital, inflation can erode your money's real spending power if you do not win prizes. With odds improving to 21,000-to-1 from September and the prize fund rate rising to 4.35%, experts still say savers should compare guaranteed alternatives.
Millions of UK savers treat Premium Bonds as a safe home for cash backed by HM Treasury. Yet financial experts warn that one key detail about how holdings behave over time is frequently missed, even as National Savings and Investments rolls out its latest prize draw improvements.
Key Takeaways
- Inflation can shrink the real value of Premium Bonds even when the face value stays unchanged.
- NS&I is raising the prize fund rate to 4.35% and shortening odds to 21,000-to-1 from the September draw.
- Multiple prizes from one draw may arrive in separate batches if you receive cheque payments.
- Experts recommend comparing Cash ISAs, easy-access accounts, and fixed-rate bonds for guaranteed returns.
- The September draw is expected to pay out more than 6.5 million prizes worth over £497 million.
What is the overlooked rule about Premium Bonds holdings?
Tim Grimsditch, managing director at Unbiased, said inflation eating away at spending power is "one of the most overlooked aspects of Premium Bonds." Each £1 bond enters a monthly prize draw rather than earning guaranteed interest.
If inflation runs at 3% and you win nothing for a year, the real value of your savings effectively falls by that amount. A £10,000 holding would still show £10,000 on paper but would buy roughly £300 less in goods and services than a year earlier. UK inflation was 2.9% for the year to July, up from 2.6% in June.
NS&I's own guidance warns: "Remember that inflation can reduce the true value of your money over time." For more unusual money stories, see our Bizarre News & Florida Man section.
Why might Premium Bonds prize cheques arrive at different times?
NS&I recently clarified how payouts work after a customer won three prizes in one draw—£500 plus two £100 wins—but received only the £500 cheque initially.
A spokesperson said the provider pays "millions of Premium Bonds prizes each month" and issues prize warrants in batches "due to the volume of payments we make." If you win multiple prizes in the same draw, warrants may not all arrive together, though NS&I aims to pay them in the month the prize is won.
You can choose bank transfer, automatic reinvestment up to the £50,000 holding limit, or postal cheque. Nine in ten prizes are paid by bank or reinvestment, which NS&I says is quicker than waiting for cheques. Full details are on the NS&I website.
How are Premium Bonds odds and payouts changing in September?
From the September draw—held Tuesday, September 1, with results on the prize checker Wednesday, September 2—odds improve from 22,000-to-1 to 21,000-to-1 per £1 bond. The prize fund rate rises from 3.8% to 4.35%, the highest level since March 2024.
This is the second uplift this year after July's move from 3.3% and 23,000-to-1 odds. GB News reports the September pot exceeds £497 million—roughly £63 million higher than August—with more than 308,000 additional prizes expected alongside over 6.5 million total payouts. Two £1 million jackpots are awarded every month.
Should Premium Bonds savers shop around for guaranteed returns?
Even with better odds, Caitlyn Eastell of Moneyfactscompare cautioned that 4.35% is not a guaranteed headline rate. "They are a game of chance," she said, and most monthly prizes are small amounts such as £25 or £50.
Grimsditch pointed to Cash ISAs, easy-access accounts, and fixed-rate bonds as alternatives with guaranteed, and often tax-free, returns. Leading easy-access ISAs currently exceed 4.50%, while NS&I British Savings Bonds reach 4.85% and some fixed bonds elsewhere offer 5%.
Tax-free prizes remain a perk, but experts note many savers already cover standard account interest through the Personal Savings Allowance—up to £1,000 for basic-rate taxpayers and £500 for higher-rate taxpayers. For predictable growth, comparing options before the next draw may matter as much as checking whether you won.