Va. Code Ann. § 58.1-531.1

If as a result of an error by the Department of Taxation or the claimant agency a taxpayer has his refund set off erroneously and is denied all or a portion of his income tax refund, interest shall be paid to the taxpayer at the rate provided in § 58.1-15 and shall accrue in the manner provided in § 58.1-1833.