A National Insurance CA5403 form is used to request a copy of your National Insurance Number. You will need to fill out the CA5403 form – part of which must be done online.

Once your appointment has been booked an email will be sent to the email address provided on the application form. You can also use this application if your personal details have changed. If you are planning on working in the UK you will need to apply for a national insurance number. We recommend you try and call the HMRC first, they may be able to send it straight out to you. If you are outside of the UK you will need to phone +44 191 203 7010. Your National Insurance number is 9 digits long and starts with two letters, followed by six numbers and one letter e.g. You will need to fill it out online and print it out. Click here to get the CA5403 form.

There are relevant sections to change your address, first name, last name and marital status. The Process. Use your personal tax account to view your National Insurance number or download a letter confirming it, or use form CA5403 to get your number by post.

You can find your lost National Insurance Number by phoning the HMRC.

If your personal details change you must let the HMRC know. Your National Insurance number can normally be found on a letter from the Department for Work and Pensions (DWP) or on your bank statement if your pension is paid into your bank account. If you have lost your National Insurance Number, HMRC will not give these out over the phone, and Jobcentre may not be able to assist you in this either. The email will contain your appointment details and explain what documents you will need to take. AB123456C. The telephone number to call is 0300 200 3500.

Your National Insurance Number in unique to you and cannot be changed, you cannot apply for a brand new one.

Find a lost National Insurance number You can find your National Insurance number on your payslip, P60, or letters about tax, pensions and benefits. When you need a National Insurance Number .