Premium Bonds Pay You 3.30% in Hope — A Savings Account Pays 4.68% in Cash

The NS&I rate cut announcement makes the gap undeniable. Put £50,000 — the Premium Bonds maximum — into the best easy access savings account and you'll earn £2,340 a year at 4.68%. That's guaranteed, paid monthly, compounding.

Put the same £50,000 into Premium Bonds and your expected return is £1,650 at the new 3.30% prize fund rate. That's a £690 gap — every single year.

But it gets worse. The 3.30% figure is the average return across all bondholders. Most holders won't hit the average because prize distribution is heavily skewed toward the jackpots. Two lucky winners take home £1 million each month, which drags up the average for everyone else. The median Premium Bonds holder — the typical saver — earns significantly less than 3.30%.

Premium Bonds advocates always play the tax card. "But the prizes are <a href="/posts/your-savings-account-interest-gets-taxed-at-40-premium-bonds-dont">tax-free</a>!" True. But irrelevant for the majority of savers.

Basic-rate taxpayers get a £1,000 Personal Savings Allowance. At 4.68%, you can hold £21,367 in a savings account before paying a single penny of tax on the interest. That covers the entire balance for most savers.

Even higher-rate taxpayers get £500 tax-free. Our savings guide explains how to maximise these allowances. At 4.68%, that shelters £10,683 without any tax liability. And if you use your £20,000 <a href="/posts/cash-isa-rates-ranked-the-10-best-accounts-for-202526-and-what-they-actually">Cash ISA</a> allowance — where all interest is tax-free — you can shelter even more.

The only savers for whom Premium Bonds have a genuine tax advantage are additional-rate taxpayers (earning over £125,140) with no PSA and maxed-out ISAs. That's a tiny fraction of the 24 million holders. For the other 23.9 million, a straightforward high-interest savings account or Cash ISA beats Premium Bonds on pure maths. Our analysis of the £500 PSA trap shows exactly where Premium Bonds start to make tax sense.

Premium Bonds aren't a savings product. They're a lottery with your capital as the ticket price.

The psychology is identical to the National Lottery: variable reinforcement, the thrill of the monthly draw, the fantasy of £1 million. NS&I even sends you emails when you win £25, creating a dopamine hit that masks the opportunity cost.

A £25 prize on a £50,000 holding is a 0.05% monthly return. Your savings account would have paid £195 that month. But the £25 feels like winning because it arrives with a congratulatory message, while £195 in interest just silently appears in your balance.

The FCA has warned that savers should compare products rather than rely on defaults. This is precisely how casinos keep you at the table. The intermittent reward feels more exciting than the steady, larger gain.

The prize fund rate has dropped from 4.65% in January 2024 to 3.30% in April 2026. That's a 29% reduction in expected returns in just over two years.

According to HM Treasury guidance, NS&I sets the rate to manage its own funding needs, not to give you the best deal. When the Treasury doesn't need your money, the rate drops. The Bank of England base rate sits at 3.75%, and competitive savings accounts are paying well above that. NS&I is choosing to pay you less.

Savings account rates are also variable, but at least you can switch provider in minutes. Moving £50,000 out of Premium Bonds takes 3-5 working days, and the inertia is exactly what NS&I counts on.

The difference between 3.30% and 4.68% on £50,000 is £690 a year. Over a decade, that's £6,900 in lost interest — before compounding.

With compounding at 4.68%, your savings account balance after 10 years would be £78,961. Premium Bonds? Still £50,000 plus whatever prizes you've spent or reinvested, with an expected value around £69,178. That's a gap of nearly £10,000.

For what? The chance that ERNIE picks your number for £1 million? The odds of winning the jackpot with £50,000 invested are roughly 1 in 55 billion per month. You're more likely to be struck by lightning twice.

If you want excitement, put £49,000 in a savings account and £1,000 on Premium Bonds. Better yet, split between a Cash ISA and a regular savings account to maximise your tax-free allowances. You'll earn more, sleep fine, and still get your monthly email from NS&I. But holding £50,000 in Premium Bonds because it "feels safe" is the most expensive comfort blanket in British finance.

This article is for informational purposes only and does not constitute financial advice. You should seek independent financial advice before making any investment decisions.

The numbers are even starker for anyone with a mortgage. At the current base rate of 3.75%, most mortgage holders are paying 4-5% interest. Every pound sitting in Premium Bonds earning an expected 3.30% is a pound not overpaying a mortgage charging 4.5%. The opportunity cost compounds both ways. Check our best cash ISA rates to find where that 4.68% is actually available.