Your National insurance number will be in the form of two letters, six numbers and one letter (for example, AB123456C).
The following is a list of places where it is most likely to be found:
For employed people:
Pay slips from your employer
P60 (end of year statement of pay and tax from your employer)
P2 (notice of tax coding from HMRC)
P45 (from your employer when you left a job)
P11D (from your employer if you get any benefits in kind)
P800 (from HMRC if you have over or underpaid tax at the end of the year)
Notice to file a tax return (SA316 or tax return (if you are in self-assessment)
For people over 16 but not yet working:
A registration letter from HMRC telling you what your national insurance number is (your parents may have this)
Notice to file a tax return (SA316) or tax return
Statement of Account
A plastic national insurance number card (these stopped being issued in 2011)
If you're applying to be added to the Electoral Register you may need to supply supporting evidence. You can do so by visiting one of our Scan Zones. Scan Zones are located in all the Gateways and Broughton Hub, they are touch screen, tablet devices that allow customers to self-scan documents.