How to find a lost National Insurance number

2 mins

Our experts at DSR Tax Refunds know how hard it is to find good, quality information about HMRC’s National Insurance rules and regulations that is easy to understand, and that’s why we have created these handy guides to tell you everything you need to know. Our aim is to make life easier for our clients and that is why we want to share our expertise with you. You can also call our friendly team on 0330 122 9972 – we’re the tax experts you can trust.

How can you find a lost National Insurance number?

Considering that it is something you receive in the post around your 16th birthday, it is no wonder that sometimes people find that they have lost their National Insurance number or can’t remember what it is. It is possible to find it though – either through checking through your own documents or by contacting HMRC.

Your National Insurance number will be shown on such things as your payslips, P60 or any letters you may have received about pension, taxes or benefits so you should be able to find out what it is from these sources. Similarly, if you have a personal tax account on the Government Gateway site, you can log on and find out what it is there.

However, if you still can’t find it, you can contact HMRC and they will let you know what it is. You can either fill in form CA5403 (either online or through the post) or you can call the National Insurance numbers helpline – if you choose this option, you will have to answer some security questions and if you can’t answer them, you will need to apply through the post.

HMRC won’t tell you your National Insurance number over the phone but they will send it to you through the post – you should receive it within 10 working days.

The helpline numbers are:

The opening times are 8am to 8pm Monday to Friday and 8am to 4pm on Saturday.

How can DSR Tax Refunds help?

We know that finding out important information about your tax and National Insurance affairs can be a complicated affair, even with our helpful guide to tell you everything you might need to know. It can seem like an absolute minefield, but help is always available and you don’t need to battle through this alone. Our team of experts at DSR Tax Refunds are always on hand to help our clients so call our friendly team on 0330 122 9972 – we’re the tax experts you can trust.

This page was last updated on 25/10/2018.

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