National Insurance Number Guide UK (Apply, Find, Lost Card 2026)

What Is a National Insurance Number and Why You Need It

A National Insurance number is a unique identifier made up of two letters, six numbers, and a final letter (for example, QQ 12 34 56 C). It stays with you for life and does not change, even if you change your name, address, or nationality. You need your NI number for: starting a new job — your employer uses it to report your earnings and deductions to HMRC through the PAYE system; paying National Insurance contributions — your contributions build your entitlement to State Pension, Jobseeker's Allowance, Maternity Allowance, and other benefits; claiming benefits — the DWP uses your NI number to check your contribution history and benefit eligibility; filing a Self Assessment tax return — HMRC links your tax return to your NI number; student loan repayments — your employer uses your NI number to deduct student loan repayments; accessing government services online — your NI number is used to verify your identity for the government gateway and other digital services; and receiving a State Pension — your NI contribution record determines your pension entitlement. You do not need an NI number if you are a child (under 16) and not working, or if you are a visitor to the UK with no right to work or claim benefits. However, if you plan to work, study, or claim benefits in the UK, you need an NI number. If you lose your right to work in the UK, your NI number remains on record but you cannot use it for employment. Your NI number is confidential — you should only share it with employers, HMRC, the DWP, and financial institutions that need it for tax or pension purposes. Never share it unsolicited or with people you do not trust.

How to Find Your NI Number (Online, Payslip, Letters)

If you have lost or forgotten your NI number, do not panic — there are several ways to find it. Online (quickest): log in to your government gateway account at gov.uk and navigate to "Your National Insurance number" in your personal details section. If you do not have a gateway account, you can create one using your email address, a valid UK passport or other ID document, and your date of birth. The system displays your NI number immediately. Check your payslip: your NI number is printed on every payslip from your employer. Look for the heading "NI number" or "National Insurance number." It is usually in the top section alongside your tax code. Check HMRC letters: your NI number appears on most letters from HMRC, including: your tax code notice (P2); your annual "Your tax account" summary; letters about your tax credits; and your State Pension forecast. P60 and P45 forms: your NI number is shown on your P60 (annual summary of pay and tax) and P45 (when you leave a job). Benefits letters: if you claim Universal Credit, Jobseeker's Allowance, or other benefits, your NI number appears on all correspondence from the DWP. Check with HMRC: if you cannot find your NI number online or on any documents, call HMRC's National Insurance helpline on 0300 200 3500. You will need to answer security questions to verify your identity (your name, address, date of birth, and possibly your mother's maiden name or previous address). HMRC will then either tell you the number over the phone or send a letter confirming it, which takes about 15 working days. Write to HMRC: if you cannot use the phone or online services, write to HMRC (National Insurance Contributions and Employer Office, HM Revenue and Customs, BX9 1AN). Include your full name, address, date of birth, and National Insurance number if you recall any part of it. HMRC will respond by post.

Apply for a First NI Number (Including Non-UK Residents)

Most UK-born children receive an NI number automatically before their 16th birthday. But if you did not get one automatically — for example, because you moved to the UK as an adult, you were home-educated, or you never claimed benefits as a teenager — you need to apply. Who can apply: you can apply for a first NI number if you live in the UK, are aged 16 or over, and have the right to work or claim benefits. You do not need an NI number to work — you can start a job without one and apply later. However, your employer will need it for PAYE reporting. How to apply (UK residents): call the National Insurance application line on 0800 141 2075. You will be asked about your identity and why you need an NI number. HMRC will send you a form (CA5400) to complete and return with proof of identity (passport, biometric residence permit, or birth certificate) and proof of address. The process typically takes 4 to 6 weeks. You can also apply online in some cases — check gov.uk. Non-UK residents: if you live abroad but need an NI number (for example, because you have a UK employment contract or are claiming UK benefits), you must call HMRC's National Insurance helpline (0300 200 3500) to discuss your situation. You may need to provide additional documentation depending on your circumstances. EU, EEA, and Swiss nationals: if you have settled or pre-settled status under the EU Settlement Scheme, you can apply for an NI number using the same process as UK residents. What you will receive: a letter called a "National Insurance number notification" containing your NI number. You will not receive a physical NI card anymore — HMRC stopped issuing plastic cards in 2011. The letter is your official record. Keep it safe. Your NI number is free — never pay anyone who offers to get you an NI number.

What to Do If You Lose Your NI Card or Letter

HMRC stopped issuing plastic National Insurance cards in 2011, and the original letters (form CA5400 or the older plastic card) are no longer replaced. If you have lost your NI card or the notification letter, do not worry — you do not need a physical document. Your NI number is stored electronically on HMRC's systems. Here is what to do. Find your number online: log in to your government gateway account at gov.uk — your NI number is displayed in your personal details section. If you do not have a gateway account, you can create one using your UK passport or other identity documents. Ask HMRC by phone: call HMRC's National Insurance helpline (0300 200 3500). After verifying your identity, they can tell you your number over the phone or send a new confirmation letter within 15 working days. Check documents: your NI number appears on payslips, P60s, P45s, tax code notices, and benefit letters. If you have any of these, you already have your NI number. Can you get a replacement card? No. HMRC no longer issues physical NI cards. The notification letter is the only official paper record. If a replacement letter is sent, it looks the same as the original. If someone asks to see your "NI card" (such as a new employer), show them your notification letter or the digital record from your HMRC account. Identity theft protection: if you believe your NI number has been stolen or used fraudulently, contact HMRC immediately. Report it to Action Fraud (0300 123 2040) if you suspect criminal activity. HMRC can flag your NI record to prevent unauthorised use. Check your employment history online to ensure no one is using your number to work illegally. See our Identity Theft guide → for more on protecting your personal information.

NI Numbers for Children and Young People

Children in the UK receive their National Insurance number automatically in the 3 months before their 16th birthday. The DWP uses information from Child Benefit records to issue the NI number without any application needed. The number is sent by letter (form CA5400) to the child's home address. What to do: check if your child has received theirs — if your child is 15 and a half or older, look out for the letter from HMRC. It is plain white with "HM Revenue & Customs" on the envelope and "National Insurance number" in the top corner. Lost or never received: if your child is 16 or over and has not received an NI number, check that Child Benefit was claimed. If Child Benefit was claimed, the number should have been issued automatically. Call the National Insurance helpline (0300 200 3500) to request it. Home-educated children: if your child was home-educated and did not receive an NI number automatically, contact HMRC to apply — the process is the same as for adults. Why children need NI numbers: they do not need an NI number until they start working (full-time or part-time). However, it is useful to have it ready before their first job application. The NI number is used by employers for PAYE reporting, and without it, the employer must use an emergency code, which can result in incorrect tax deductions. Young people and National Insurance contributions: even if your child works part-time while at school or college, they need their NI number. Earnings below the Lower Earnings Limit (£6,396 per year in 2026/27) do not count as a qualifying year for State Pension purposes, but the NI number is still needed for the payroll system. Once your child turns 16 and starts work, they begin building their NI record, which ultimately affects their future State Pension. See our Voluntary NI guide → for how to fill gaps if they have missing years later in life.

NI Number Scams and Protecting Your Number

National Insurance number scams are increasingly common. Scammers call, email, or text claiming to be from HMRC and demand payment or personal information to "prevent your NI number being suspended" or to "process a tax refund." How to spot an NI number scam: HMRC will never call you out of the blue demanding immediate payment; never send emails with links to login pages (HMRC uses secure messages in your online account); never ask you to pay via iTunes vouchers, Amazon gift cards, or cryptocurrency; and never threaten immediate arrest or deportation if you do not pay. If you receive such a call, hang up. If an email looks suspicious, forward it to phishing@hmrc.gov.uk and then delete it. Protecting your NI number: treat your NI number like a password — only share it with employers, HMRC, the DWP, and financial institutions that genuinely need it for tax or pension purposes. Do not write it down where others can see it (on a CV, on social media, in an unsecured email). Shred documents containing your NI number before disposing of them. If your NI number is stolen: contact HMRC's National Insurance helpline (0300 200 3500) immediately and report it to Action Fraud (0300 123 2040). Monitor your employment history on your HMRC account to check for signs of identity fraud (someone using your NI number to work illegally). Check your State Pension forecast regularly to ensure no unauthorised gaps or contributions have been recorded. Real HMRC contact: HMRC's genuine phone numbers are 0300 200 3500 (NI helpline) and 0300 200 3310 (Self Assessment helpline). If you are unsure whether a call is genuine, ask for the caller's name and department, hang up, and call HMRC back on the official number. See our Identity Theft guide → and Scammed: What to Do guide → for more on protecting yourself from financial fraud.

FAQs

How long does it take to get an NI number?

If you apply by phone, HMRC sends a form (CA5400) which you complete and return with identity documents. The process takes about 4 to 6 weeks from submitting the completed form. Children receive theirs automatically 3 months before their 16th birthday.

Can I work without an NI number?

Yes. You can start a job without an NI number. Your employer will use an emergency tax code until you provide it. Apply for an NI number as soon as possible to ensure correct tax and NI deductions. Your employer must still register you for PAYE even without an NI number.

What if I lose my NI notification letter?

You do not need the physical letter. Your NI number is stored electronically. You can find it online through your government gateway account, check your payslip or P60, or call HMRC's NI helpline to have it confirmed over the phone or sent again by post.

Do I need an NI number if I am from the EU?

If you have settled or pre-settled status under the EU Settlement Scheme and plan to work or claim benefits in the UK, you need an NI number. Apply through the standard process (call 0800 141 2075). Your EU passport or biometric residence card serves as identity proof.

Is there a charge for an NI number?

No. Getting an NI number is completely free. If anyone asks you to pay for an NI number, it is a scam. HMRC does not charge for issuing NI numbers. Report any company or individual asking for payment to Action Fraud immediately.