Vt. Stat. Ann. tit. 32, § 8921

If a rental company neglects or refuses to file any report required by this chapter, the Commissioner shall make an estimate of the tax due, based upon information available to him or her, for the period for which the rental company failed to make the report, and shall assess the tax due from such rental company, adding to the amount thus determined a penalty of 50 percent thereof. The assessment shall bear interest at the rate of one and one-half percent per month from the date the tax payment was due until paid. The Commissioner shall give the rental company notice by mail of the assessment and payment shall be due within 15 days of the date of the mailing of the notice.