N.H. Rev. Stat. § 80:3
Before any collector of taxes or deputy shall notify the director of the division of motor vehicles that the resident tax of any person is unpaid, the collector or deputy shall make a demand in person or in writing by registered mail, limited to delivery to addressee only, return receipt requested, from such delinquent taxpayer or the person who is liable therefor. If such person neglects or refuses to pay the tax within 14 days, the collector may certify under the penalties of perjury upon a form provided by the director of the division of motor vehicles, containing the name and address of the taxpayer or person liable for payment of the tax and such other information as the director may require, that to the best of the collector's knowledge and belief such tax is unpaid, that demand in person or in writing by registered mail, as aforesaid, has been made and that the taxpayer or person liable for payment of the tax neglects and refuses to pay the same and request the director to take such action as may seem proper. The receipt of such certification by the director shall be sufficient evidence to require the director to revoke the registration of the person or persons named therein as provided in RSA 260:6; and until such time as evidence of payment of the tax has been furnished the director when the registration may be restored.
RSA 80:3
1953, 173:3. RSA 80:3. 1961, 166:3. 1973, 486:6. 2003, 112:2, eff. Aug. 5, 2003.