NS&I Just Raised Premium Bonds to 3.80% Tax-Free. Your 5.01% Savings Account Looks Good Until HMRC Takes Their Cut.

The most common attack on Premium Bonds is the simplest: "3.80% is less than 5.01%, therefore Premium Bonds are worse." This is lazy. It ignores tax entirely.

Let's run the numbers for three taxpayers, each with £20,000 to save. All have used their ISA allowance. The comparison is a 5.01% taxable savings account versus Premium Bonds at a realistic 3.3% median return (and yes, the median is lower than the headline 3.80% — but even at 3.3%, the tax advantage closes the gap):

• Basic-rate taxpayer (20%): 5.01% becomes 4.01% after tax. Premium Bonds at 3.3% are still behind — but only by 0.71 percentage points, not 1.71. The Personal Savings Allowance of £1,000 protects the first £20,000-ish at 5%, so most basic-rate savers do keep the full 5.01%. Fair point against Premium Bonds here.

• Higher-rate taxpayer (40%): 5.01% becomes 3.01% after tax (once the £500 PSA is used up — which £20,000 at 5.01% exhausts almost immediately). Premium Bonds at 3.3% tax-free are now ahead by 0.29 percentage points. The maths has flipped.

• Additional-rate taxpayer (45%): 5.01% becomes 2.76% after tax. Premium Bonds at 3.3% tax-free are ahead by 0.54 percentage points. And at a more optimistic median return of 3.5% — achievable with a larger holding — the gap widens further.

The HMRC tax rates and allowances confirm these bands. For about 5.6 million higher and additional-rate taxpayers in the UK, the tax-free status of Premium Bonds is not a minor feature — it is the entire investment case.

The cash ISA allowance is £20,000 per year. It has been frozen at that level since 2017. In real terms — adjusted for the 2.8% CPI inflation rate reported by the Bank of England — the £20,000 allowance is now worth about £17,000 in 2017 money. HMRC is quietly shrinking your tax shelter.

Once you fill your ISA, the question is: where does the next pound go? You have three real options:

1. Taxable savings account — interest taxed at your marginal rate
2. Premium Bonds — prizes tax-free, up to £50,000
3. Gilt holdings — capital gains on gilts are tax-free, and there's the low-coupon gilt trick for higher-rate taxpayers

For most people, Premium Bonds fill the gap between "ISA full" and "I want more safe, government-backed savings" better than anything else. The NS&I product page confirms the £50,000 maximum — that's £50,000 of additional tax-sheltered capacity beyond your ISA. For a couple, that's £140,000 of combined ISA + Premium Bonds tax-free shelter.

A savings account gives you interest and a tax bill. Premium Bonds give you prizes and no tax bill. For savers who have filled their ISA, this distinction matters.

If you have not yet used this year's ISA allowance, the order of operations is clear: fill the cash ISA first for the guaranteed tax-free return, then look to Premium Bonds for overflow. Our savings hub tracks the best rates across every account type.

Dismissing the jackpot as "unlikely" is technically true but financially incomplete. The expected value of the jackpot is small — roughly 0.005% of £1 million per year for a £50,000 holder, or about £50. But expected value isn't the right framework for evaluating lottery-like payoffs.

A better framework: what would an equivalent "lottery option" cost if you bought it separately? A £50,000 holding gives you 600,000 entries per year (50,000 Bonds × 12 draws). The odds of winning £1 million in any given year: roughly 1 in 22,000 — about 0.0045%. Buy a lottery ticket with those odds and it would cost significantly more than the interest you're giving up by choosing Premium Bonds over a savings account.

More practically: nobody gets rich from a 5.01% savings account. Over 30 years, £50,000 at 5.01% compounds to £216,000. That's nice. It does not change your life. The Premium Bonds jackpot — however remote — actually does. And you get to hold it in a wrapper where the downside is roughly 1-2 percentage points of foregone interest, not the total loss of capital you'd face buying actual lottery tickets.

This is not a "lottery ticket wrapped in the language of saving." This is a savings product with a lottery kicker. The distinction is not semantic — your capital is intact regardless of whether you win.

This is the same logic that makes gold an attractive portfolio diversifier — not because you expect it to outperform equities, but because its payoff profile is different from everything else you own. Premium Bonds offer a similar non-correlated kicker within the cash portion of your portfolio.

The "median return is far below 3.80%" critique is correct — for small holdings. But it matters much less for larger ones.

With only £1,000 in Premium Bonds, you have 12,000 entries per year at 22,000-to-1 odds. Your expected number of prizes per year is about 0.55. You are more likely to win nothing than something. The distribution is painfully lumpy.

With £50,000 — the maximum — you have 600,000 entries per year. Expected prizes: about 27. With 27 prizes, the law of large numbers starts to kick in. Your actual return converges toward the mean. You are far less likely to experience a "zero year" and far more likely to achieve something approaching the headline rate.

This is a crucial point the critics miss: Premium Bonds are a scale product. They work better the more you hold. The £25 minnow holder gets a lottery ticket. The £50,000 holder gets something approaching a predictable return plus a lottery kicker.

If you're holding £500 in Premium Bonds for "a bit of fun," the critics are right — the expected return is terrible and you should probably just move it. If you're holding £50,000 as part of a deliberate tax strategy, the maths is much more favourable.

For more on how prize distribution works and the full product details, see our complete NS&I Premium Bonds 2026/27 guide.

The FSCS protects deposits up to £120,000 per banking licence. For most savers, that's plenty. For wealthy savers — the very people who benefit most from Premium Bonds' tax treatment — it creates a genuine problem.

If you hold £200,000 in cash across several banks, you need to track which banks share licences (Halifax and Bank of Scotland share one; NatWest and Ulster Bank share another), ensure no single licence exceeds £120,000, and monitor as mergers change the map. This is administratively annoying and creates concentration risk if you get it wrong.

NS&I has none of this complexity. Every pound is backed by HM Treasury. There is no limit. You could hold £2 million in NS&I products and every penny is government-guaranteed. For high-net-worth individuals managing cash outside of ISAs and pensions, this is not a theoretical advantage — it is why NS&I exists.

The FCA's FSCS information confirms the £120,000 limit for deposits. NS&I exists specifically because the government needs a vehicle that can accept deposits beyond what the FSCS framework can protect. That is Premium Bonds' structural advantage, and it's not going away.

This matters more than ever in 2026. The Bank of England has held the base rate at 3.75% since the June MPC meeting, with the next decision due on 30 July. Mortgage rates sit around 4.9% for a five-year fix. In this environment, the premium you pay for NS&I's unconditional Treasury guarantee — roughly 1-2 percentage points of foregone interest versus the best buy savings account — is a modest insurance cost for peace of mind on large cash holdings.

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