N.H. Rev. Stat. § 21-J:28-e

I. Notwithstanding any other provision of law, any taxpayer aggrieved by a fraudulent investment scheme may petition for a refund of overpayment of taxes resulting from a fraudulent investment scheme for which an amended federal tax return has been filed claiming a theft loss for the fraudulent investment scheme under Internal Revenue Code section 165. Such petition for refund of overpayment of taxes shall be made within 180 days of the taxpayer filing the amended federal tax return. II. For purposes of this section, "fraudulent investment scheme" means a transaction in which the party perpetrating the fraud receives cash or property from investors, purports to earn income for the investors, and reports to the investors income amounts that are wholly or partially fictitious. In a fraudulent investment scheme the party perpetrating the fraud criminally appropriates some or all of the investors' cash or property. III. After a petition for refund is filed, the department shall examine the petition and either issue a notice of refund or credit to the claimant or issue a notice of denial. After receipt of the department's decision, the claimant may file a written petition for reconsideration with the department as provided in RSA 21-J:28-b.