Premium Bonds at 3.30%: The Exact Maths on Who Should Still Hold Them

NS&I confirmed two changes taking effect from the April 2026 prize draw:

• Prize fund rate: drops from 3.60% to 3.30%
• Odds per £1 Bond: lengthen from 22,000 to 1 to 23,000 to 1

This is the fourth cut since January 2025, when the rate stood at 4.00%. The trajectory tracks the Bank of England base rate, which has fallen from 4.50% in February 2025 to 3.75% today.

The prize pool for April will be approximately £375 million spread across close to six million prizes. Two £1 million jackpots remain, but fewer £100 and £50 prizes will be distributed.

For a broader look at how falling rates affect savers, see our analysis of the best fixed rate bonds in the UK.

Premium Bonds prizes are exempt from both Income Tax and Capital Gains Tax. That's the entire product proposition — and it only matters if you'd otherwise pay tax on savings interest.

The Personal Savings Allowance gives basic-rate taxpayers £1,000 of tax-free interest per year, and higher-rate taxpayers £500. Additional-rate taxpayers get nothing.

The HMRC guidance on savings income confirms these thresholds for 2025/26. Here's the after-tax comparison for a £50,000 holding — the Premium Bonds maximum:

Basic-rate calculation assumes PSA already used by other savings. Higher/additional-rate assumes PSA exhausted.

For basic-rate taxpayers who haven't used their £1,000 PSA, the best easy access account at 4.55% delivers £2,275 tax-free on the first £1,000 of interest — crushing Premium Bonds. But for a higher-rate taxpayer with the PSA exhausted, Premium Bonds' £1,650 beats the 4.55% account's after-tax £1,365 by £285 per year.

That £285 gap is the real product. Not the lottery excitement.

At 23,000-to-1 odds with 50,000 Bond numbers, you'll statistically enter about 2.17 winning numbers per monthly draw (50,000 ÷ 23,000). Over a year, that's roughly 26 prizes.

Most will be £25 — the minimum and most common prize. The expected annual return at 3.30% on £50,000 is £1,650. Divide that across 26 prizes and you're averaging about £63 per prize, but in practice you'll see mostly £25s with the occasional £50 or £100.

The distribution is heavily skewed. According to NS&I's prize allocation, the vast majority of prizes are £25. Your chances of winning £1 million in any given month with a full £50,000 holding are approximately 1 in 57 billion.

With a smaller holding — say £10,000 — you'd expect about 5 prizes per year averaging £66 total. At that level, the variance is enormous. You could easily win nothing for months, then get two £25 prizes in one draw. The "expected return" of 3.30% is a statistical average across all bondholders — your personal experience will deviate significantly.

The NS&I prize draw allocation confirms two £1 million jackpots per month remain unchanged. The number of £100,000 prizes will drop from two to one, and £50,000 prizes from four to three. The real squeeze comes in the £25 and £50 tiers, where hundreds of thousands fewer prizes will be distributed. This is where most holders feel the cut — not in the headline rate, but in the frequency of small wins that make the product feel rewarding.

Basic-rate taxpayers with holdings under £20,000: Your Personal Savings Allowance covers £1,000 of interest. At 4.55%, you can hold roughly £22,000 before breaching that. Below that threshold, a top easy access account beats Premium Bonds by over 1 percentage point — and delivers a guaranteed return rather than a probabilistic one.

Anyone using Premium Bonds as their emergency fund: The 3-5 business day withdrawal time is fine for most emergencies, but several challenger banks now offer instant access at higher rates. Chase pays 4.50% in year one, and Coventry Building Society offers 4.15% with no bonus gimmicks.

Holders with less than £1,000: At small holdings, the variance dominates. You could hold £500 for years without winning a single prize. The expected annual return is just £16.50 — you'd likely see £0 or £25, nothing in between. Move it to an account paying guaranteed interest.

Our savings hub tracks the best available rates across easy access, notice, and fixed-term accounts — updated regularly.

Higher-rate taxpayers with PSA exhausted: This is the sweet spot. At 40% tax, your after-tax return on a 4.55% account is 2.73%. Premium Bonds' expected 3.30% is clearly better, and the advantage widens as rates fall further — the tax-free wrapper becomes proportionally more valuable.

Additional-rate taxpayers: At 45% tax, the gap is even wider. A 4.55% gross rate becomes 2.50% after tax. Premium Bonds beat that by 0.80 percentage points on £50,000 — an extra £400 per year.

Anyone who's already filled their ISA: The £20,000 ISA allowance is the first place for tax-free savings. But once that's maxed, Premium Bonds are the next-best tax shelter for cash. Our guide to ISA types and strategies covers the full landscape. NS&I's Direct ISA pays just 3.50% — good, but you can only put £20,000 in per year.

People who need capital-protected, HM Treasury-backed savings: NS&I products are backed by the Treasury, not the FSCS £85,000 guarantee that covers bank deposits. For holdings above £85,000 spread across different banks, this distinction matters. Though with a £50,000 cap, most holders are well within FSCS limits at their other banks too.

Before cashing out Premium Bonds entirely, consider NS&I's own fixed-rate products. The current NS&I rates show Guaranteed Growth Bonds (now branded "British Savings Bonds") paying:

• 1-year fixed: 4.07% AER
• 2-year fixed: 3.98% AER
• 3-year fixed: 4.02% AER
• 5-year fixed: 4.05% AER

These are taxable — but for basic-rate taxpayers within their PSA, they deliver a guaranteed return that beats Premium Bonds' expected 3.30%. According to NS&I's current rate card, the minimum is £500, maximum £1 million, and they carry the same HM Treasury backing.

For higher-rate taxpayers, the after-tax returns are less compelling. A 1-year bond at 4.07% yields 2.44% after 40% tax — worse than Premium Bonds. The fixed rates only win if you're a basic-rate taxpayer or have unused PSA headroom.

Alternatively, the NS&I Direct ISA at 3.50% tax-free beats Premium Bonds outright for everyone — but counts toward your annual ISA allowance. If you haven't used your 2025/26 ISA allowance before 5 April, that should be your first move.

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