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What should I do with a big Premium Bonds win?

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UKUpdated 6 October 2026 · Written by BuyMeWhiskey Editorial Team · How we check facts

A Premium Bonds prize is tax-free, so take your time: clear expensive debts, keep three to six months of essential costs in easy access, use your £20,000 ISA allowance and consider your pension, keeping no more than £120,000 at any one bank.

See how much the money could grow in an ISA or savings account with the compound interest calculator, then plan where each part goes.

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First, the good news on tax

NS&I says Premium Bond prizes are free from UK Income Tax and Capital Gains Tax. Once you move the money somewhere else, though, any interest it earns is taxed in the normal way. You can earn some interest tax-free under the Personal Savings Allowance: £1,000 a year for basic-rate taxpayers, £500 for higher-rate taxpayers and nothing for additional-rate taxpayers. Interest inside an ISA doesn't count towards it.

Getting the money

Most prizes are paid straight to your nominated bank account, normally by the 7th working day of the month. For prizes of £25,000, £50,000 or £100,000, NS&I sends a claim form instead, posted on the first working day of the month. You have to complete and return it before the prize is paid. The £1 million winner gets a home visit.

There's no rush. The money is safe while you decide: NS&I is backed by HM Treasury and says it secures 100% of your savings. Banks and building societies are only covered by the FSCS up to £120,000 per person, per banking licence, so if you move a large sum, spread it across separately licensed banks.

A sensible order for a windfall

Clear expensive debt. MoneyHelper says paying off credit cards, unauthorised overdrafts, payday loans, home credit and any mortgage arrears is usually cheaper in the long run than saving while you owe them.
Build an emergency fund. MoneyHelper's rule of thumb is three to six months of essential outgoings in an instant-access account.
Use your ISA allowance. You can put up to £20,000 into ISAs in the 2026/27 tax year, which runs to 5 April 2027. All interest and growth inside is tax-free. From 6 April 2027, people under 65 will only be able to put £12,000 of that into cash ISAs, so if you want cash, this tax year is the time to use the full £20,000.
Think about your pension. Contributions get tax relief, and with relief at source the provider adds basic-rate relief of 20%. Relief only applies to contributions up to 100% of your earnings for the year, and a prize doesn't count as earnings. Most people also have a £60,000 annual allowance. The money is then locked away until pension age.
Keep or top up your Premium Bonds. The maximum holding is £50,000. If you're below it, you can ask NS&I to reinvest prizes automatically, and new Bonds bought that way are eligible from the very next draw. Bonds don't pay interest, and NS&I notes that inflation can reduce the real value of your money.
Overpay your mortgage or help family. Check your lender's overpayment limits first. For gifts, see the Inheritance Tax rules on the £3,000 annual exemption and the 7-year rule.

Common mistakes

Leaving it all in one bank above the £120,000 FSCS limit.
Forgetting the Personal Savings Allowance. A large sum in an ordinary savings account can easily earn more than £1,000 of interest a year.
Locking everything away in pensions or fixed-term accounts before you've set aside an emergency fund.
Making decisions in a hurry. If you're thinking about investing a large amount, consider paying for advice from a financial adviser authorised by the FCA.

Where Dan's £100,000 prize goes

Worked example

Dan, a basic-rate taxpayer, wins £100,000 in the 2026/27 tax year. He owes £4,000 on a credit card, his essential bills are £1,800 a month, and he already holds £20,000 of Premium Bonds.

He returns the claim form, and the prize arrives tax-free.
Credit card: he pays off the £4,000.
Emergency fund: 6 × £1,800 = £10,800 goes into an easy-access account.
ISA: £20,000 before 5 April 2027.
Pension: he earns £45,000, so he can get relief on up to that amount. He pays in £10,000, and with 20% relief at source his pot receives £10,000 ÷ 0.8 = £12,500.
Premium Bonds: he has room for £50,000 − £20,000 = £30,000 more, and buys that.
What's left: £100,000 − £4,000 − £10,800 − £20,000 − £10,000 − £30,000 = £25,200, which he puts in a savings account at a different bank.

Tax check: if his £10,800 + £25,200 = £36,000 of ordinary savings earned 4% (an example rate), that's £1,440 of interest. The first £1,000 is covered by his Personal Savings Allowance, so £440 is taxed at 20%, which is £88. If he moves more into an ISA next tax year, that tax disappears.

Do I pay tax on a Premium Bonds win?#

No. NS&I says Premium Bond prizes are free from UK Income Tax and Capital Gains Tax. But once you move the money into an ordinary savings account, interest above your Personal Savings Allowance is taxable.

How do I claim a big Premium Bonds prize?#

For prizes of £25,000, £50,000 or £100,000, NS&I posts a claim form on the first working day of the month. You need to fill it in and send it back before the prize is paid. Smaller prizes normally reach your bank by the 7th working day of the month.

Should I put my Premium Bonds winnings back into Premium Bonds?#

You can if you hold less than the £50,000 maximum, and NS&I can reinvest prizes automatically so the new Bonds enter the very next draw. Bonds pay no guaranteed interest, so compare the prize fund rate with tax-free ISA rates and keep your emergency fund somewhere instantly accessible.

Is it safe to leave a large win with NS&I?#

Yes. NS&I is backed by HM Treasury and says it secures 100% of your savings, even above the £120,000 that the FSCS covers at banks. If you move the money to banks, spread it so no more than £120,000 sits under any one banking licence.

Should I pay off my mortgage with my prize?#

Clear expensive debts and set aside three to six months of essential outgoings first. After that, overpaying a mortgage can make sense, but check your lender's overpayment limit and compare your mortgage rate with what you could earn tax-free in an ISA.

Keep reading

Sources

Figures checked against these sources on 6 October 2026. If a rule changes, we update the page and its date.

General information, not personal financial advice. Rules depend on your circumstances; check the official source or speak to a regulated adviser before acting.