Premium Bonds start with a minimum purchase of £25 and can build to £50,000. Your new bonds must be held for a full calendar month before their first monthly draw, so buying after the month-end can delay your chance to win by another draw. Prizes are tax-free, but winning is never assured.
Premium bonds suit cash that can accept no return
Premium Bonds suit people who value capital security and tax-free prize potential more than a predictable return.
Choose certainty or prize potential
A Cash ISA pays stated tax-free interest, subject to its terms, while Premium Bonds pay prizes only to winning numbers. Think of a savings account as being paid rent for lending out your cash, while Premium Bonds are like free raffle tickets attached to money you can later take back.
You must meet NS&I's eligibility rules when buying new bonds, and a parent, guardian or grandparent can manage bonds for a child under 16. A person who later moves abroad can normally keep existing bonds, but should check NS&I's current rules before trying to buy more.
Premium Bonds are government-backed savings issued by National Savings and Investments (NS&I). They protect the pounds you put in, but they do not protect your spending power against inflation or promise any yearly gain.
Before buying or adding to NS&I savings, use a simple ownership checklist. Premium Bonds are held in one person’s name, not jointly, and the £50,000 maximum holding applies to that individual holder. A child owns Premium Bonds bought for them, even where an eligible adult buys or manages them until the child can take control. UK residents can generally buy, while people who have moved abroad can normally retain existing bonds; eligibility to make a new purchase from overseas can depend on their circumstances, including specific provisions for some Crown employees and their spouses or civil partners.
Keep evidence of any registered power of attorney and estate paperwork separately, because an attorney or executor must use NS&I’s formal process rather than relying on the holder’s ordinary account access.
Buying premium bonds: wait a full month for draws
New Premium Bonds normally need to be held for one full calendar month before their first monthly draw.
Buy from £25 up to £50,000
The minimum investment is £25 and the maximum holding is £50,000 per person. Each £1 creates one unique bond number, meaning £1,000 gives you 1,000 separate entries in every draw once eligible.
See the first-draw timeline
The timing matters because cash can sit without any draw entry for several weeks. A purchase made on 2 April and one made on 29 April normally follow the same broad pattern: both complete May as their full holding month and join the June draw.
From purchase to prize or withdrawal
1. Buy bonds
£25 to £50,000
2. Full month held
No draw entry yet
3. Monthly draw
Each £1 enters
4. Keep or cash in
Usually no penalty
Example: April purchase, full month in May, first eligible draw in June.
Set prize payments and reinvestment
You can ask NS&I to pay prizes into your bank account or, if eligible and within the £50,000 limit, reinvest them into more bonds. Reinvestment can increase future entries, but it still does not create compound interest in the way a savings account does.
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Our recommendation
A simple Premium Bonds notebook can be useful when several family members hold bonds or when you are checking old certificates. Record purchase months, NS&I numbers and whether prizes go to your bank or back into bonds.
- Keeps the first eligible draw month visible for each purchase
- Creates a clear record for an attorney or executor if needed
- Helps spot unclaimed prizes and outdated payment details
Check availability →
Premium Bonds prizes do not need to be lost simply because an address, bank account or NS&I login is out of date. Check the NS&I prize checker, app or online account regularly, particularly for older holdings and paper certificates, because a winning bond may need the holder to claim or update payment details before money can be sent. An unclaimed prize remains linked to the bond holder rather than being added automatically to the bond balance.
Once details are current, eligible holders can normally choose to have future tax-free prizes paid to a nominated bank account or added through Premium Bonds reinvestment, provided the £50,000 Premium Bonds limit is not exceeded.
Prize fund rate and odds show different things
The prize fund rate shows the value NS&I plans to distribute across all eligible bonds, while the odds show each £1 bond number's chance in one monthly draw.
The most frequent error at this point is treating the prize fund rate as a like-for-like savings rate. It is better viewed as the average outcome of a very large raffle, not as the return promised to your own £10,000.
One bond has one monthly chance
If NS&I odds were 1 in 22,000 per £1 bond each month, £1,000 gives 1,000 chances in that draw, not a guaranteed prize. NS&I can change both odds and the prize fund rate, so check the current figures on the NS&I website before deciding.
| Holding | Bond entries | Average wait* | Approx. No prize in 1 year* | Practical risk |
|---|
| £25 | 25 | 880 months | About 99% | Long dry spells are normal |
| £1,000 | 1,000 | 22 months | About 58% | No yearly prize remains likely |
| £10,000 | 10,000 | 2.2 months | About 0.4% | Prizes are likely, value varies |
| £50,000 | 50,000 | Under 1 month | Very close to 0% | Still no stated return |
*Illustrative calculations using 1 in 22,000 odds per £1 per monthly draw. Prize size and actual return cannot be predicted.
A £50,000 balance can still lag cash
A £50,000 holder has far more entries than someone with £25, but higher chances do not guarantee that their prizes beat a top Cash ISA. The median outcome can differ from the prize fund rate because a few high prizes pull the overall average upwards.
Compare cash ISAs before moving your money
A Cash ISA is normally the stronger choice when you need a known tax-free return, while Premium Bonds suit cash where uncertain prizes are acceptable.
Compare the returns you can rely on
Premium Bonds are backed directly by HM Treasury through NS&I. Eligible deposits with banks and building societies are normally covered by the Financial Services Compensation Scheme up to its stated limit, while account rates and access terms differ between providers.
| Product | Return known in advance? | Tax treatment | Access to cash | Best fit |
|---|
| Premium Bonds | No | Prizes tax-free | Usually 3 to 5 working days | Prize-minded cash |
| Cash ISA | Yes, subject to rate terms | Interest tax-free | Easy access or fixed term | Tax-free certainty |
| Easy-access account | Yes, but rate can change | Interest may be taxable | Often same day to 1 day | Emergency cash |
| Fixed-rate account | Yes | Interest may be taxable | Limited until maturity | Cash not needed soon |
Protect your ISA allowance
Do not withdraw from an ISA simply to fund Premium Bonds before checking whether the ISA is flexible. With a non-flexible ISA, cash withdrawn may only return under a future allowance, whereas an ISA transfer moves money between ISA providers without losing its tax-free status.
Cash in part or all of your holding
You can usually request a partial withdrawal or cash in all your Premium Bonds online through NS&I, with no loss of the original capital. NS&I commonly says payments take between 3 and 5 working days, but allow longer around bank holidays or if your account details need checks.
Premium Bonds are usually a poor fit if you need monthly interest for your budget, need a predictable return within one year, are investing for long-term growth, or carry expensive debt such as credit-card borrowing. Paying debt charging 20% interest is normally more valuable than keeping cash in an uncertain prize draw.
For cashing in Premium Bonds, decide first whether you need part of the holding or every bond number. An online request normally lets you specify a partial amount, while a full cash-in closes the holding and removes all remaining entries once NS&I processes it. Payment is generally sent to the bank account registered with NS&I, so check the account details before submitting Premium Bonds withdrawals; security checks or a recent change of details can extend the usual 3 to 5 working-day timescale.
If the holder cannot use the online service, such as where an attorney, executor or vulnerable customer is involved, NS&I can explain the appropriate identity and authority process. There is normally no withdrawal penalty, but neither is there interest accrued for the days the money was held.
Your questions answered
How do I cash in premium bonds online?
Log in to NS&I, choose the Premium Bonds to withdraw and confirm the bank account for payment. A full or partial cash-in usually reaches your bank within 3 to 5 working days, but check NS&I's live service information first.
What is the best time to buy premium bonds?
Buying earlier in a month does not normally get you into a draw sooner than buying later that same month. Both must complete a full calendar month, so buy when you have decided the cash does not need a guaranteed rate.
What are the odds with £50,000 in premium bonds?
£50,000 gives you 50,000 separate £1 entries in each eligible draw. That makes prizes very likely over a year at typical published odds, but it does not guarantee you will match the prize fund rate.
Can I keep premium bonds if I move abroad?
You can normally keep Premium Bonds bought while eligible after moving overseas. Buying new Premium Bonds from abroad may be restricted by your residency and status, so confirm the current NS&I rules before sending money.
Are premium bond prizes taxable?
No, Premium Bond prizes are tax-free and are not taxed as savings interest under normal UK rules. This differs from ordinary savings interest, which can become taxable after relevant allowances are used.
What happens to premium bonds when someone dies?
The Premium Bonds remain in the draws for up to 12 months after the holder's death, subject to NS&I rules, and then form part of the estate. Executors or legal representatives should contact NS&I and provide the requested estate documents.
Keep bonds only when uncertainty feels worthwhile
Keep Premium Bonds when you have emergency cash elsewhere, have compared the lost guaranteed interest, and would be comfortable receiving no prize for a year.
Use a simple annual comparison
List the prizes you received over the last 12 months, then compare them with the interest the same balance could have earned elsewhere. This turns a vague feeling about luck into a clear pounds-and-pence decision.
Check ownership details as well
Review names, addresses, bank details and nominations when family circumstances change. Attorneys acting under a registered power of attorney and executors handling an estate have separate NS&I processes, so do not assume an online account login gives automatic authority.
Further reading
If you want to learn more about this topic, these sources may interest you:
