You can check your National Insurance record online to see:
what you have paid, up to the start of the current tax year (6 April 2019)
any National Insurance credits you have received
if gaps in contributions or credits mean some years do not count towards your State Pension (they are not ‘qualifying years’)
if you can pay voluntary contributions to fill any gaps and how much this will cost
Before You Start
You need a Government Gateway user ID and password to check your National Insurance record. If you do not have a user ID, you can create one when you check your record.
Personal Tax Account
Signing in to the ‘Check your National Insurance record’ service activates your personal tax account. You can use this to check your HMRC records and manage your other details.
Check your HMRC records on GOV.UK's website
Other Ways to Apply
You can request a printed National Insurance statement:
You will need to say which years you want your statement to cover. You cannot request statements for the current or previous tax year.
National Insurance contributions and Employers Office
HM Revenue and Customs