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HMRC will attempt to validate National Insurance numbers provided by checking with the DWP. In cases where there is a discrepancy, or where the employer has not provided a National Insurance number, HMRC will inform the employer.

If the annuitant (a person who is entitled to receive benefits from an annuity) queries the National Insurance number provided by HMRC, the annuitant should contact HMRC to resolve the query.

The more accurate and comprehensive employee data the employer gathers and maintains, the more likely it is that the National Insurance number provided will be correct.