North Carolina General Statutes Chapter 105. Taxation § 105-129.18. Substantiation

To claim a credit allowed by this Article, the taxpayer must provide any information required by the Secretary of Revenue. Every taxpayer claiming a credit under this Article must maintain and make available for inspection by the Secretary of Revenue any records the Secretary considers necessary to determine and verify the amount of the credit to which the taxpayer is entitled. The burden of proving eligibility for a credit and the amount of the credit rests upon the taxpayer, and no credit may be allowed to a taxpayer that fails to maintain adequate records or to make them available for inspection.