Pillar Guide · Updated June 2026

Premium Bonds vs Taxed Savings: Which Wins After Tax? UK Guide 2026/27

Premium Bonds pay tax-free prizes rather than interest, which makes them most attractive to savers who have used their Personal Savings Allowance and ISA. Against a taxed savings account, the key is to compare the tax-free prize fund rate with an account's after-tax return. This guide explains how prizes are taxed (they are not), the prize fund rate, the GBP 50,000 limit, who benefits most, how Premium Bonds compare with a Cash ISA, and two worked examples.

Last updated: 10 June 2026Last reviewed: 10 June 2026How we verify

Key Premium Bonds facts -- 2026/27

Prizes: entirely tax-free, do not use any allowance
Maximum holding: GBP 50,000 per person
Minimum purchase: GBP 25
Capital protection: 100% backed by HM Treasury
Personal Savings Allowance: GBP 1,000 / GBP 500 / nil
Cash ISA limit: GBP 20,000 (guaranteed tax-free interest)

How Premium Bonds Work

Premium Bonds are a savings product from National Savings and Investments (NS&I). Instead of paying interest, every GBP 1 bond is entered into a monthly prize draw, with prizes ranging from small amounts up to large jackpots. You can hold between GBP 25 and GBP 50,000, and each bond has an equal, independent chance of winning each month.

Your capital is fully protected and never falls in nominal value, but the return is variable: in any given period you might win nothing, a little, or occasionally a great deal. Prizes can be paid out or reinvested up to the GBP 50,000 limit.

The Tax Position

All Premium Bond prizes are free of UK income tax and capital gains tax. Crucially, they do not count towards your Personal Savings Allowance, the starting rate for savings, or any income threshold. This is what sets them apart from an ordinary savings account, where interest above your allowance is taxed at 20%, 40% or 45%.

For a higher-rate taxpayer with a GBP 500 allowance, or an additional-rate taxpayer with no allowance at all, the tax-free nature of prizes can make Premium Bonds competitive even when the headline prize fund rate looks modest compared with savings rates.

The Prize Fund Rate

NS&I sets a prize fund rate, the total value of prizes as a percentage of all money invested. It is an average across every bondholder, not a personal guaranteed return. Because prizes are random, most people win less than the prize fund rate, some win nothing in a year, and a few win large prizes that pull the average up.

The rate is reviewed periodically and can rise or fall, so always check the current published prize fund rate before making a comparison. Treat it as an expected, not guaranteed, return.

Comparing After-Tax Returns

The fair comparison is the tax-free prize fund rate against the after-tax rate of a savings account. To convert a savings rate to after-tax for interest above your allowance, multiply by (1 minus your tax rate):

Basic rate (20%): a 5% account yields 4% after tax.
Higher rate (40%): a 5% account yields 3% after tax.
Additional rate (45%): a 5% account yields 2.75% after tax.

If the prize fund rate is above your after-tax savings rate, Premium Bonds may be attractive on an expected basis, remembering the prize return is variable while the savings interest is guaranteed.

Who Benefits Most

Premium Bonds suit higher-rate and additional-rate taxpayers who have used their Personal Savings Allowance and filled their ISA, because tax-free prizes then compare well with heavily taxed interest. They also appeal to savers who enjoy the chance of a large prize and can accept a variable return.

They are less compelling for basic-rate taxpayers with an unused GBP 1,000 allowance, whose savings interest may already be entirely tax-free. For those savers a competitive easy-access account or Cash ISA often gives a higher, certain return.

Premium Bonds vs a Cash ISA

A Cash ISA gives guaranteed tax-free interest up to the GBP 20,000 annual limit, while Premium Bonds give a variable tax-free return with no guarantee. For most savers it makes sense to use the ISA allowance first for certainty.

Once the ISA allowance and Personal Savings Allowance are used up, Premium Bonds become a logical next home for tax-free cash, particularly for those in higher tax bands. The choice ultimately comes down to whether you value a certain return or the chance of a prize, alongside full Treasury-backed capital protection.

Worked Examples

Example 1 -- higher-rate taxpayer, allowance used. Aisha is a higher-rate taxpayer who has already used her GBP 500 Personal Savings Allowance and filled her ISA. She is comparing GBP 50,000 in Premium Bonds with a 5% savings account.

Savings account interest: GBP 50,000 x 5% = GBP 2,500
Tax at 40% (allowance used): GBP 2,500 x 40% = GBP 1,000
After-tax interest: GBP 2,500 - GBP 1,000 = GBP 1,500 (effective 3%)
Premium Bonds: tax-free; at an example prize fund rate of 4% the expected (not guaranteed) win is GBP 2,000
Outcome: on an expected basis the tax-free prizes beat the 3% after-tax account, though prizes are variable.

Example 2 -- basic-rate taxpayer with spare allowance. Ben is a basic-rate taxpayer with no other interest, so his full GBP 1,000 Personal Savings Allowance is available. He compares GBP 20,000 in a 5% account with Premium Bonds.

Savings account interest: GBP 20,000 x 5% = GBP 1,000
Tax due: GBP 1,000 is fully covered by the GBP 1,000 allowance, so GBP 0 tax
After-tax interest: GBP 1,000 (full 5%, guaranteed)
Premium Bonds: at an example 4% prize fund rate the expected win is GBP 800, variable
Outcome: the guaranteed tax-free 5% account beats the variable prizes for Ben.

These examples use an illustrative 4% prize fund rate and a 5% savings rate; always check the current figures. Use the savings calculator to model your own after-tax return before deciding.

Frequently Asked Questions

Are Premium Bond prizes really tax-free?

Yes. Prizes from Premium Bonds, run by National Savings and Investments (NS&I), are entirely free of UK income tax and capital gains tax. They do not count towards your Personal Savings Allowance, your starting rate for savings, or any income tax threshold. This is one of their main attractions, particularly for higher-rate and additional-rate taxpayers who have little or no savings allowance left. However, tax-free does not mean guaranteed; the return depends on whether your bonds win prizes, which is random.

What is the Premium Bonds prize fund rate?

The prize fund rate is the annual rate NS&I uses to set the total value of prizes paid out across all bonds, expressed as a percentage of the total amount invested. It is an average across all bondholders, not a return you are guaranteed to receive. Because prizes are allocated by a random draw, many people win less than the prize fund rate and some win nothing in a given year, while a few win large prizes. The rate is reviewed periodically by NS&I and can rise or fall, so always check the current rate before comparing.

How do I compare Premium Bonds with a taxed savings account?

Compare the Premium Bonds prize fund rate (tax-free) with the after-tax interest rate of a savings account. To convert a savings rate to after-tax, multiply by (1 minus your tax rate) for interest above your allowances. For example, a 5% savings rate becomes 3% after 40% tax for a higher-rate taxpayer who has used their Personal Savings Allowance. If that 3% is below the prize fund rate, Premium Bonds may be more attractive on an expected basis, though the prize return is variable and not guaranteed while savings interest is.

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Who benefits most from Premium Bonds?

Premium Bonds tend to suit higher-rate and additional-rate taxpayers who have already used their Personal Savings Allowance (GBP 500 for higher-rate, nil for additional-rate) and have filled their ISA, because the tax-free prizes then compare favourably with heavily taxed interest. They also appeal to savers who value the chance of a large prize and do not mind a variable, possibly zero, return. They are less compelling for basic-rate taxpayers with a GBP 1,000 allowance who have not used it, since their savings interest may already be tax-free.

Is my money safe in Premium Bonds?

Yes. Because NS&I is backed by HM Treasury, all the money you put into Premium Bonds is fully protected by the government, with no upper limit on the protection. This is stronger than the GBP 85,000 per person per institution limit of the Financial Services Compensation Scheme that applies to ordinary bank savings. Your capital does not fall in value, but inflation can erode its real value over time if your prizes are low, since there is no guaranteed interest to keep pace with rising prices.

How much can I hold in Premium Bonds?

The maximum holding is GBP 50,000 per person, and the minimum purchase is GBP 25. Each GBP 1 bond has an equal, independent chance of winning in each monthly draw, so holding more bonds increases your chances proportionally. Prizes range from small amounts up to large jackpots, and any prizes won can be automatically reinvested to buy more bonds up to the GBP 50,000 limit. Bonds can be bought for children, with a parent or guardian as the nominated adult until the child turns 16.

Should I use my ISA before Premium Bonds?

For most savers, yes, a Cash ISA is worth using first because it gives guaranteed, tax-free interest, whereas Premium Bonds give a variable, possibly zero, tax-free return. The ISA subscription limit is GBP 20,000 for 2026/27. If you have already used your ISA allowance and your Personal Savings Allowance, Premium Bonds become a sensible next home for tax-free savings, especially for higher and additional-rate taxpayers. The right order depends on whether you value certainty of return or the chance of a prize.

Do Premium Bonds beat inflation?

Not reliably. Premium Bonds protect your capital in nominal terms but offer no guaranteed return, so if your prize winnings are low or nil they will not keep pace with inflation, and the real value of your money falls. Even at the average prize fund rate, returns may lag inflation in periods of high price rises. They are best viewed as a safe home for cash where you want tax-free upside and full capital protection, rather than as a long-term inflation-beating investment. For long-term growth, a Stocks and Shares ISA is usually more suitable.

Do I need to declare Premium Bonds prizes on my tax return?

No. Because Premium Bond prizes are entirely free of income tax and capital gains tax, they do not need to be reported on a Self Assessment tax return and do not use up any of your Personal Savings Allowance or Dividend Allowance. This is different from bank or building society interest, which your bank reports to HMRC and which can affect your tax code or Self Assessment liability if it exceeds your allowance.

Can I withdraw Premium Bonds money quickly if I need it?

Yes, Premium Bonds are relatively easy to cash in. You can request a withdrawal online, by phone or by post, and money is typically paid into your bank account within a few working days. This makes them more accessible than some fixed-term savings products, though you will not earn any further prize entries once bonds are cashed in, and you lose that month’s draw entry if you withdraw before the deadline.

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About the author

Emma Clarke

UK Tax Writer

Emma Clarke has been writing about UK personal tax since 2018, with a particular focus on Self Assessment, PAYE coding and the practical mechanics of how HMRC actually applies the rules to ordinary salaries. Her work concentrates on translating the dense language of HMRC manuals and Finance Act schedules into worked examples that show, pound by pound, how income tax and National Insurance reduce a gross salary to the figure that lands in a UK bank account. Emma covers the full PAYE lifecycle: tax codes (1257L, BR, K codes, emergency codes), the Marriage Allowance, the High Income Child Benefit Charge, salary sacrifice arrangements and their effect on pensionable pay, the Apprenticeship Levy, and the differences between the rUK and Scottish income-tax regimes. She is particularly interested in the edge cases that catch PAYE employees out — the £100,000 personal-allowance taper, the 60% effective marginal rate it creates, and the interaction between student-loan plans and pension contributions. Every figure in Emma's articles is verified against the current HMRC rates pages and worked through a Self Assessment calculation by hand before publication. She writes to CalcHub's editorial standards: primary-source citations, plain English, no promotional language, and clear "this is general information, not financial advice" disclaimers where appropriate.

Personal-finance writer since 2018
UK tax specialism — PAYE, Self Assessment, National Insurance
Writes to CalcHub editorial standards (primary-source citation, annual review)

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Last updated: 10 June 2026How we verify

Disclaimer: This guide reflects UK rules for 2026/27 as of June 2026 and is general information, not financial advice. Premium Bond prizes are variable and not guaranteed; the prize fund rate can change. See NS&I: Premium Bonds for current details.