Premium Bonds UK guide 2026: how they work, prize rates and odds

Banking

Premium Bonds are issued by National Savings and Investments (NS&I), an executive agency of HM Treasury, and have been available to UK savers since 1956. Unlike a savings account, Premium Bonds do not pay interest. Instead, every £1 bond gives you an entry in a monthly prize draw managed by ERNIE (Electronic Random Number Indicator Equipment). Prizes are paid tax-free, meaning higher and additional rate taxpayers benefit most in relative terms compared with taxable savings accounts.

The prize fund rate - effectively the equivalent interest rate used to calculate the total monthly prize pool - is set by NS&I and reviewed periodically. As of May 2026, NS&I has adjusted the prize fund rate following movements in the Bank of England base rate. This guide explains how the prize draw works, what your statistical chances of winning are, the tax treatment, and how to buy or cash in bonds.

How the Premium Bond prize draw works

Each £1 denomination bond is assigned a unique number. Every month, NS&I's ERNIE system generates random numbers corresponding to winning bonds. There is no human intervention in the draw; ERNIE is a hardware random number generator that has been independently verified. Bonds become eligible for the draw the month after they are purchased. For example, bonds bought in April 2026 first enter the draw for June 2026. Bonds that win a prize in one month remain eligible for all future draws - there is no restriction on winning multiple times.

The total prize fund each month is calculated by applying the annual prize fund rate to the total value of eligible bonds, then dividing by 12. NS&I then allocates this pool across prize tiers from £25 up to £1 million, with the two £1 million jackpot prizes fixed each month and the remaining pool distributed across lower tiers. The exact number of prizes in each tier varies month to month as the prize fund size fluctuates.

Prize fund rate and equivalent interest rate

NS&I expresses the generosity of Premium Bonds through the annual prize fund rate, which is the percentage of total eligible bond value paid out as prizes each year. NS&I also publishes a notional equivalent interest rate calculated on the assumption that all prizes were distributed equally across all bondholders - which they are not, due to the random nature of the draw. The notional rate gives a useful comparison point against savings accounts, but your actual return depends entirely on whether your specific bonds win prizes. A bondholder holding the maximum £50,000 would historically expect to win prizes somewhat regularly due to the statistical volume of entries, but a holder with £1,000 of bonds may go many months without any prize at all.

Tax treatment of Premium Bond prizes

All Premium Bond prizes are free of UK income tax and capital gains tax, regardless of the size of the prize or the tax status of the holder. This applies to the £25 minimum prize and the £1 million jackpot equally. HMRC does not require Premium Bond prizes to be declared on a self-assessment return. For basic rate taxpayers who already benefit from the Personal Savings Allowance of £1,000 per year, the tax-free status of Premium Bonds is less significant. For additional rate taxpayers, who have no Personal Savings Allowance and pay 45% income tax on savings interest, tax-free prizes represent a significant relative advantage over equivalent taxable savings accounts.

How to buy Premium Bonds and check for prizes

Premium Bonds can be purchased online at nsandi.com, by phone, or by post. Payment is accepted by debit card or bank transfer. There is no application form for existing NS&I customers who can log in and purchase bonds directly. Bonds can also be purchased as a gift for children under 16 by parents, grandparents, or guardians. Prize checks are available via the NS&I prize checker tool on the website or via the NS&I app, which also sends notifications when prizes are won. NS&I no longer sends prize warrants by post to most customers; prizes are paid directly to a nominated bank account or can be reinvested in additional bonds.

Cashing in Premium Bonds

You can cash in some or all of your Premium Bonds at any time without penalty. The minimum cash-in amount is £25 (one bond). Funds are typically transferred to your nominated bank account within three to five working days of the request. Bonds cashed in during a month do not enter that month's prize draw. There is no notice period or early exit charge. Your capital is always returned in full regardless of when you cash in, as there is no investment risk to the bond value itself.

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Frequently asked questions

Are Premium Bonds safe?

Yes. Premium Bonds are backed 100% by HM Treasury, not just FSCS protection. There is no limit to the amount protected. Your original capital is always returned in full when you cash in. The only risk is the opportunity cost of not earning guaranteed interest elsewhere.

How do I know if I have won a prize?

NS&I will notify you by email or via the NS&I app if you have won. You can also use the free prize checker tool on nsandi.com at any time by entering your bond holder number. Prize draws close on the last working day of the month, with results published on the NS&I website shortly after.

Can children hold Premium Bonds?

Yes. Parents, grandparents, and guardians can purchase Premium Bonds as a gift for children under 16. The bonds are held in the child's name. Once the child turns 16, they can manage the bonds themselves. Children's bonds enter the same monthly draw and prizes are paid to the nominated bank account.

What happens to Premium Bonds when the holder dies?

Premium Bonds remain eligible for the prize draw for up to 12 months after the holder dies, provided the estate has not been wound up. After that, or once the estate is administered, the bonds must be cashed in and cannot be transferred to another person. The executor or administrator of the estate handles the encashment process.

Are Premium Bond prizes better than savings account interest?

It depends on luck and your tax position. Statistically, holders with smaller bond amounts are likely to receive less back than the equivalent interest from a competitive savings account. For larger holders, particularly those who pay higher rate or additional rate income tax, the tax-free nature of prizes can make Premium Bonds competitive or superior depending on the prize fund rate at the time. A direct comparison requires knowing the current prize fund rate and the best available after-tax savings rate.

How we verified this guide

All figures and rules were verified against NS&I official guidance, HMRC savings income tax guidance, and HM Treasury NS&I framework documents during May 2026. Prize fund rates are subject to periodic NS&I review. We do not accept payment from product providers and do not earn commission on consumer financial products.

Primary sources

• NS&I - Premium Bonds product page
• HM Treasury - NS&I framework and guarantees
• HMRC - Tax on savings interest and Personal Savings Allowance
• MoneyHelper - Premium Bonds guide

Last reviewed: May 2026.