NS&I just raised the Premium Bonds prize fund rate back to 3.80% for the August 2026 draw, with odds of 22,000 to 1 on every £1 bond. That sounds like good news if you're one of the roughly 24 million people holding them, and in one sense it is — the number of £100,000 prizes each month has climbed from 71 to 83, and £50,000 prizes have gone from 143 to 167. But a headline rate on Premium Bonds has never worked the way a headline rate on a savings account works, and this August the gap between the two is wide enough that it's worth actually doing the sum rather than assuming the number on NS&I's website tells you what you'll get.
What changed, and why
The prize fund rate has moved three times in twelve months: down from 3.8% to 3.6% in August 2025, down again to 3.3% in April 2026, then back up to 3.80% from the July 2026 draw. NS&I sets this rate with one eye on the Bank of England base rate, which the Monetary Policy Committee held at 3.75% on 30 July 2026 — the fifth consecutive hold, with three of the nine committee members actually voting for a rise to 4% on concerns about energy-driven inflation. The next decision lands on 17 September 2026. NS&I doesn't need to track Bank Rate exactly, but it does need to stay roughly competitive with what banks are paying savers, or money walks out the door into easy-access accounts instead.
The number that actually matters: it's an average, not a rate
Here's the part most coverage glosses over. The 3.80% prize fund rate is the total prize money paid out across all Premium Bonds each month, expressed as an annualised percentage of the total sum invested. It is not interest, and it is not what you personally will earn. With odds of 22,000 to 1 per £1 bond per monthly draw, someone holding the maximum £50,000 has roughly a 68% chance of winning at least one prize in a given month — usually £25 — and a much smaller chance of anything larger. Someone holding £1,000 has closer to a 4% chance of winning anything at all in any single month. Run that forward over a year and the median outcome for a small holder is often £0, with the 3.80% figure only showing up if you're unlucky enough (or lucky enough, depending on how you frame it) to be exactly average across thousands of draws.
Premium Bonds against the best easy-access accounts on the table now
As of 6 August 2026, the headline easy-access rate in the UK is 5.00% AER from LemFi, with Revolut matching it on a promotional Instant Access Savings rate for new customers opening before 4 August, capped at £25,000 and reverting to 2.90% on the Standard plan from 4 December 2026. Strip out the short-lived bonuses and the more durable options sit lower but still ahead of Premium Bonds' average: Tembo Money's HomeSaver pays 4.55% AER including a 12-month bonus, Saga's Easy Access account pays 4.50% AER on the same basis, and Chase's boosted rate of 4.50% only applies for the first 31 days of a new current account.
None of that interest is guaranteed to a specific saver the way a Premium Bonds prize is either — every one of those rates is variable and can be cut with notice, the way Bank Rate cuts have already dragged rates down twice this year. What's different is that a savings account rate applies to every pound you hold, every month, with no lottery element. A Premium Bonds saver with £5,000 might go three months without winning a single prize and then land £100 in month four; a savings account holder with £5,000 at 4.50% earns roughly £18.75 in interest every single month, like clockwork.
Where Premium Bonds actually win: tax
This is the argument that gets Premium Bonds taken seriously by people who'd otherwise dismiss them, and it's a real one. Prizes are entirely tax-free, with no limit, which matters once you're earning enough interest elsewhere to breach your Personal Savings Allowance. For the 2026/27 tax year that allowance is £1,000 for basic-rate taxpayers and £500 for anyone whose total income — salary plus interest — pushes them past the higher-rate threshold of £50,270. Additional-rate taxpayers get no allowance at all. Above those thresholds, savings interest is taxed at your marginal rate: 20%, 40% or 45%.
A basic-rate taxpayer with £25,000 sitting in an ordinary savings account paying 4.5% earns £1,125 in interest a year — £125 over the allowance — and owes £25 in tax on it. That's a manageable bill. It stops being manageable once you're a higher earner with a large emergency fund parked outside an ISA: at 40% tax, every £1,000 of interest above your £500 allowance costs you £200. If your ISA allowance is already fully used for the tax year — £20,000 for 2026/27, though that drops to £12,000 from April 2027 for everyone under 65 — Premium Bonds become one of the few places left to hold cash without the taxman taking a cut, since prizes sit completely outside the PSA calculation.
The safety-net difference nobody mentions
Premium Bonds are backed 100% by HM Treasury with no upper limit on protection, because NS&I is a state institution rather than a bank taking commercial risk with your deposit. A bank or building society savings account, by contrast, is covered by the Financial Services Compensation Scheme up to £120,000 per person per authorised firm, a limit that rose from £85,000 on 1 December 2025. For most men reading this, £120,000 of FSCS cover is more than enough headroom and the distinction is academic. It stops being academic if you've just sold a business or a house and are temporarily sitting on £300,000+ in cash — FSCS covers temporary high balances like that up to £1.4m, but only for six months, and only if you've actually notified the institution. Premium Bonds carry no such time limit or paperwork requirement, up to the £50,000 holding cap.
So where does that leave you
Treat Premium Bonds as what they are: a tax shelter with a lottery wrapped around it, not a savings account with better branding. If you're a higher-rate taxpayer who has maxed out this year's ISA allowance and still has spare cash sitting in taxable savings, moving some of it into Premium Bonds is the right call — you're trading a small amount of expected return for a tax-free wrapper and unlimited state backing, and at 40% or 45% marginal rates that trade is usually worth making. If you're a basic-rate taxpayer with headroom left in your £1,000 Personal Savings Allowance and an ISA allowance you haven't used, the top easy-access or fixed-rate cash ISA on the market — Sidekick's 4.66% easy-access ISA or a fixed-rate ISA up to 4.85% from Close Brothers or Leek Building Society for five years — will beat the Premium Bonds average in nearly every scenario, and won't leave you checking a prize checker every month for a number that never comes up.
The exception worth naming honestly: if £25 or £50 arriving unpredictably is genuinely more motivating to you than watching a savings balance tick up by pennies each month, that's not irrational, it's just a different kind of return. Money you'd otherwise never check on suddenly gets checked. That behavioural nudge has real value for some people and none at all for others, and no spreadsheet comparison settles which camp you're in.
None of this is personalised advice — your own tax position, existing ISA usage and attitude to risk all change the answer, and a regulated financial adviser can run the numbers against your actual circumstances. But the raw comparison for August 2026 is clear enough on its own: Premium Bonds' 3.80% average sits below every top easy-access account and every top cash ISA currently on the market, and the only scenario where that stops mattering is when tax, not return, is the constraint you're actually solving for.