How Do Premium Bonds Work? Prizes, Odds and the Prize Fund Rate Explained

📚 Savings Guide 7 min read · 19 July 2026

How Do Premium Bonds Work? Prizes, Odds and the Prize Fund Rate Explained

Premium Bonds pay no interest. Instead, each £1 bond is entered into a monthly tax-free prize draw run by NS&I, which is backed by HM Treasury. Your capital is fully protected and all prizes are tax-free — but returns are not guaranteed. Here is how the draw works, what the prize fund rate actually means, and how Premium Bonds compare with savings accounts that pay guaranteed interest.

What are Premium Bonds?

Premium Bonds are a savings product issued by NS&I (National Savings & Investments), a government-backed organisation. Each £1 you invest buys one bond with a unique number. Your bonds are entered into a monthly prize draw. You may win prizes or nothing at all. Your capital is fully backed by HM Treasury. (Source: NS&I, nsandi.com.)

Premium Bonds are not a savings account in the conventional sense. They pay no interest. There is no guaranteed rate of return. The only way to earn anything is to win a prize.

The minimum holding is £25. The maximum is £50,000 per person. (Source: NS&I, nsandi.com.)

How the monthly prize draw works

ERNIE: Each month, a computer called ERNIE — Electronic Random Number Indicator Equipment — generates a set of random winning numbers. Each bond with a winning number receives a prize. (Source: NS&I, nsandi.com.)

Equal odds: Once eligible for the draw, every £1 bond has the same odds in each monthly draw, regardless of how long it has been held.

Prizes: Prizes range from £25 to £1 million. Each month there are two £1 million jackpot prizes, along with prizes at various levels between £25 and £100,000. Most prizes are in the lower-value prize band, while a much smaller number of higher-value prizes are awarded each month. (Source: NS&I, nsandi.com; NS&I Monthly Prize Allocation.)

Tax-free: All prizes are tax-free with no limit. Prize winnings do not count towards your Personal Savings Allowance and do not need to be declared on a self-assessment return. (Source: NS&I, nsandi.com.)

Prize payment: Prizes can be paid directly into your nominated bank account or automatically reinvested into more Premium Bonds, subject to the £50,000 holding limit. You can check whether you have won using the NS&I prize checker or app. Check NS&I for current prize payment timings. (Source: NS&I, nsandi.com.)

New bonds: Bonds first become eligible for the draw in the month after the calendar month following purchase. Bonds bought at any point in November, for example, first enter the January draw. (Source: NS&I, nsandi.com.)

Prize fund rate ≠ interest rate ≠ your expected personal return. Premium Bonds pay no interest and no return is guaranteed. The only return available is through winning prizes in the monthly draw.

The prize fund rate — what it means and what it doesn't

The prize fund rate is the closest thing Premium Bonds have to an interest rate — but it is fundamentally different from a guaranteed savings rate.

The prize fund rate determines the overall amount NS&I allocates to prizes relative to eligible Premium Bond holdings. It is not an interest rate and does not predict what an individual holder is likely to receive. Individual returns can be zero, below the prize fund rate or substantially above it. (Source: NS&I corporate announcement, May 2026.)

At the level of the entire prize fund: for every £100 held across all eligible bonds, NS&I allocates an amount equivalent to approximately the prize fund rate percentage in prizes annually. But this amount is distributed randomly, not proportionally. A holder with £100 in bonds might win nothing in a given year; a holder with £50,000 might win far more or far less than the prize fund rate percentage of their holding.

The prize fund rate and odds are set by NS&I and can be changed at any time. They have been adjusted multiple times in recent years. (Source: NS&I corporate announcement, May 2026.)

Current prize fund rate and odds

Check nsandi.com for the current prize fund rate, odds and monthly prize allocation. (Source: NS&I, nsandi.com.)

Treasury backing — not FSCS, but government-backed

Premium Bonds are not covered by the Financial Services Compensation Scheme (FSCS). However, they are backed by HM Treasury directly — NS&I is a government agency, and Premium Bond capital is a direct obligation of the UK government. There is no limit on this backing. (Source: NS&I, nsandi.com; GOV.UK.)

Buying and withdrawing

Premium Bonds can be bought and managed online, by phone or by post via NS&I. There is no notice period and no penalty for withdrawing. Withdrawals typically take three to five working days to reach your bank account. (Source: NS&I, nsandi.com.)

You can hold Premium Bonds on behalf of a child under 16. Bonds can also be given as gifts. (Source: NS&I, nsandi.com.)

How Premium Bonds compare with savings accounts

Because rates change frequently, this table focuses on structural distinctions.

	Premium Bonds	Easy access savings account
Return	Random prize wins; no guaranteed return	Interest at a variable rate
Rate structure	Prize fund rate and odds can change	Interest rate can change
Tax treatment	All prizes tax-free, unlimited	Taxable above Personal Savings Allowance
Capital protection	HM Treasury backed	FSCS up to £120,000 per eligible person per authorised firm
Access	No notice; 3–5 working days to withdraw	Depends on account terms
Minimum	£25	Varies by provider and account
Maximum	£50,000 per person	Varies by provider and account

Premium Bond prizes are tax-free, while savings interest outside an ISA may be taxable depending on your Personal Savings Allowance and circumstances. This can affect the relative value of prizes and taxable savings interest, but the Premium Bonds prize fund rate should not be treated as a guaranteed return when making that comparison. Tax treatment depends on individual circumstances. (Source: GOV.UK; NS&I, nsandi.com.)

Why people hold Premium Bonds

Premium Bonds are held for a range of reasons: the government backing, the tax-free nature of prizes, the accessibility, the possibility of winning larger prizes, and for some, the enjoyment of the monthly draw element.

Because Premium Bonds do not provide a guaranteed return, their return profile differs fundamentally from savings accounts that pay interest.

🔍 Savings Finder — compare easy access, fixed bonds and notice accounts with guaranteed rates Explore →

BritSavvy note: This article is for information only and does not constitute financial advice. Prize fund rate and odds data sourced from NS&I corporate announcements (May 2026) and nsandi.com. The prize fund rate and odds are subject to change by NS&I at any time — check nsandi.com for current figures. Tax treatment of prizes depends on individual circumstances. Capital is backed by HM Treasury, not the FSCS.

What are Premium Bonds?

Premium Bonds are a savings product issued by NS&I (National Savings & Investments), backed by HM Treasury. Each £1 invested buys one bond entered into a monthly prize draw. Prizes are tax-free and range from £25 to £1 million. Your capital is fully backed by HM Treasury, but there is no guaranteed interest or minimum return. (Source: NS&I, nsandi.com.)

What is the prize fund rate?

What are the odds of winning?

Once eligible, every £1 bond has the same odds in each monthly draw, regardless of how long it has been held. Check nsandi.com for the current odds per £1 bond. (Source: NS&I, nsandi.com.)

When are my bonds first eligible for the draw?

Bonds first become eligible in the month after the calendar month following purchase. Bonds bought in November, for example, first enter the January draw. (Source: NS&I, nsandi.com.)

Are Premium Bonds tax-free?

All prizes are tax-free with no limit. They do not count towards your Personal Savings Allowance and do not need to be declared on a self-assessment return. (Source: NS&I; GOV.UK.)

Are Premium Bonds safe?

Your capital is backed by HM Treasury directly — NS&I is a government agency. There is no FSCS protection, but HM Treasury backing is a direct government obligation with no stated limit. (Source: NS&I, nsandi.com; GOV.UK.)

Can I withdraw my Premium Bonds at any time?

Yes — there is no notice period and no penalty for withdrawing. Withdrawals typically take three to five working days to reach your bank account. (Source: NS&I, nsandi.com.)

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