Finding Your National Insurance Number

The Secret to Finding Your National Insurance Number

You may not know where to find your National Insurance Number, but you will certainly need it. The NI number is a 10-digit number that identifies individuals for the purposes of social security & taxation.

Where to Find Your National Insurance Number

Where to Find Your National Insurance Number

There are various documents given to UK citizens for easy identification. A national insurance number is one of the mandatory ones. If you’re a citizen born in the UK, this number will be issued to you just before you turn sixteen. If you moved to the UK later in your life, this number should be on your biometric resident permit.

So, it’s evident that this is an important document. What happens if you lose it? How can you find it? Will have to move to an undisclosed location?

Well, lucky for you, here’s a comprehensive guide to guide you through the national insurance number1 and how to find it.

All About the National Insurance Number

Let’s get this show on the road:

The national insurance number is a code issued to every citizen in the UK before they turn sixteen. The eight-digit code consists of two letters, six numbers, and a letter, for example, RT456789Y.  It’s typically a form of identification and a must-have if you want to pursue higher education on a student loan, work legally, and even vote in the country.

We’re not done yet:

You’ll also need to provide this number when setting up a pension fund, whether personally or through your employer. The pension provider will require this number to see if you have any other pension plans. Additionally, it’ll allow them to know if you’ve been making contributions to the National Insurance¹ to determine whether you’re eligible for the state pension.

Where to Look For Your National Insurance Number

I know the feeling:

If you lost your national insurance number, or don’t know your NI number, there are various ways you can get it:

On Your Documents

Your official documents, such as payslips, P60, tax, and pension-related forms, should have this number. If you, however, recently moved to the UK, the number will be on the back of your biometric resident permit.


If you can’t locate any of the documents mentioned earlier, then your next option is logging online. It’s easy for people who have personal tax accounts.  All you have to do is to login into your account hen check to see your NI number.

Calling the HMRC Hotline

The HMRC2 national insurance has a hotline, which allows you to speak to a customer care attendant. The attendants will ask you some questions to verify your identity, and if you answer these questions to their satisfaction, your national insurance number will be sent to you by mail. The hotline number is 0300 200 3500.

Requesting By Post

If none of the above options appeals to you, or you are having trouble answering the questions asked by the customer care agents, you need to fill out a CA5403 form. You’ll then mail this to the address listed on the document.

Your national insurance number is a form of identification. Therefore you should know it, maybe even by heart, and keep it safe. Having this number and making the required contributions to the national insurance will make you eligible for the state pension. That, combined with a private pension scheme from a reliable provider, will set you up nicely for your retirement.

However, since you’re human, you might have lost the NI number. When you do, don’t start panicking and planning to relocate to the islands. By checking online or calling the HMRC, you can find it and continue making your monthly pension contributions. It’s never that serious!

Common Questions

How Can You Find Your National Insurance Number?

What Happens If You Lose Your National Insurance Number?

Where Can You Find Proof Of Your National Insurance Number?

Can I Get A Replacement National Insurance Card?

In conclusion

So, it all adds up to this:

National Insurance Numbers are used to identify UK citizens and residents. They are issued by the National Insurance Recording Centre (NIRC) in an individual’s home country, which is usually the place of their birth or residence. They can also be acquired through marriage if a spouse has one. The NIRC will issue a National Insurance Number that corresponds to the applicant’s gender, date of birth, and nationality.

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Editorial Note: This content has been independently collected by the EveryInvestor advisor team and is offered on a non-advised basis. EveryInvestor may earn a commission on sales made from partner links on this page, but that doesn’t affect our editors’ opinions or evaluations. Learn more about our editorial guidelines.
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