How to apply for a National Insurance number as an international student

What is a National Insurance number?

A National Insurance number (NINO) is your personal reference for the UK tax and benefits system. It's formatted as two letters, six digits, and a final letter: AB123456C is the standard format. Every person who earns money in the UK needs one.

As an international student, you'll use your NI number to:

• pay income tax and National Insurance contributions at the right rate
• avoid being put on an emergency tax code that overtaxes you from your first payslip
• claim a tax refund at year end if you've paid too much
• build a UK tax record for when you switch to a graduate or work visa later

You can legally start a job without one, but apply as soon as you have an offer or begin working.

Who can apply?

You can apply if you're physically in the UK and have the right to work here. On a Student visa, you can work:

• up to 20 hours per week during term time
• full time during official university vacation periods and after your course ends

For a full breakdown of your working rights, see gov.uk/student-visa↗ or Luodi's working-while-studying guide.

How to apply: step by step

The application is online and free. There is no paper form.

1. Go to gov.uk/apply-national-insurance-number↗ and click "Apply now".
2. Sign in to or create a Government Gateway account. You'll need an email address and a mobile number for verification.
3. Answer the questions about your personal details, your UK address, your right to work (visa type, passport details, BRP or eVisa reference).
4. Submit the form. You'll get a confirmation email with a reference number straight away.

After you submit, HMRC will either:

• post your NI number letter directly to your UK address, or
• send you an invitation to a short phone or video appointment to confirm your identity before issuing it

Keep that confirmation email. If HMRC contacts you for an appointment, having the reference number saves time.

What documents do you need?

You don't upload scans during the online application. The form simply asks for:

• your passport number and expiry date
• your BRP card or eVisa details (if you have one)
• your UK address, where your NI number letter will be posted
• basic employment details (optional, but include them if you have a job already)

If HMRC schedules an identity-check appointment, have your passport and immigration documents ready for the call.

How long does it take?

HMRC doesn't publish a fixed timescale; check the current estimate at gov.uk/apply-national-insurance-number↗. In practice, most applicants get their number within a few weeks.

If you're in a rush, such as when an employer is threatening emergency tax on your next payslip, call HMRC's National Insurance enquiries line: 0300 200 3500 (Monday to Friday, 8am to 6pm).

Starting work before your number arrives

You can legally start work before your NI number arrives. Tell your employer you've applied, give them your confirmation reference, and hand over the actual number as soon as it lands. Your employer's payroll team can add it to your record retroactively.

Without your NI number on file, some employers may apply an emergency tax code (W1 or M1), which means you pay more tax than you owe. To reclaim any overpayment, see gov.uk/claim-tax-refund↗.

What to do when it arrives

Your NI number letter will arrive in a plain envelope addressed to your UK address. Once you have it:

• Give the number to your employer's payroll team in writing
• Keep the letter somewhere safe — or photograph it
• Check it matches the details on any payslips you've already received

Your NI number is yours for life. It appears on every payslip, your annual P60, and any HMRC correspondence. If you ever lose it, call 0300 200 3300 to retrieve it after identity verification, or check Luodi's National Insurance guide.

Don't share it outside employment or official tax contexts.

FAQ

Do I need a National Insurance number before I can start work in the UK?

No. You can begin work without one — give your employer your name, your right to work evidence, and let them know you've applied. Pass the number to payroll as soon as it arrives. What you shouldn't do is work for months without bothering to apply.

Can I apply for a National Insurance number before I have a job?

Yes, as long as you're already in the UK and have the right to work on your current visa. Applying before you have a job is perfectly fine; it means you'll have it ready the moment you need it.

How long does it take to get a National Insurance number in the UK?

HMRC doesn't give a guaranteed timeframe. Most applicants receive their number within a few weeks. Check the current processing estimate at gov.uk/apply-national-insurance-number↗.

Do international students have to pay National Insurance?

Only if your earnings are above the Primary Threshold — check the current figure at gov.uk/national-insurance↗. Most students working part-time stay under it, which means no National Insurance is due. Earnings that do cross the threshold are taxed at the standard employee rate.

What if my employer puts me on emergency tax because I don't have an NI number yet?

That's an error on your employer's part, but it happens. Keep your payslips. Once your NI number is on your record, HMRC will usually correct your tax code automatically through PAYE. If it isn't corrected within a few months, see gov.uk/claim-tax-refund↗ to request the refund directly.