Vt. Stat. tit. 24A § 3-106
Except when otherwise provided, if at the expiration of the time within which any installment of such tax is to be paid to the Chief Administrative Officer under the preceding section, any person against whom such tax has been so assessed shall be delinquent in the payment of such installment thereof, the amount due from him or her on such installment shall thereafter be deemed to be the amount of such installment increased by a penalty of one percent for a period of seven days and thereafter by a penalty of five percent thereon. If such installment increased by five percent is not paid by the 12th day of the month after the date upon which it became delinquent, the Chief Administrative Officer shall increase the amount due by an additional one percent of the original installment. On the 12th day of every month thereafter that the tax or any part thereof remains due, the Chief Administrative Officer shall add to the total amount due an additional amount equal to one percent of the original installment, or any portion thereof, remaining unpaid. The Chief Administrative Officer shall apply such penalty to each installment that is delinquent. If at the expiration of 10 months and 25 days from the time said tax bill shall be delivered to said Chief Administrative Officer, any person against whom a tax has been so assessed shall then be delinquent in the payment of any installment or portion thereof, the amount due from him or her on such installment or portion on which he or she is so delinquent shall thereafter be deemed to be the amount of such installment or delinquent portion of such original tax increased by all penalties and interest accruing thereon to date and one dollar for the insertion of his or her name in the warrant hereinafter mentioned, and also 12 percent interest, compounded annually on all of such delinquent tax and any penalties and interest added thereto, from the date of such warrant.
24 Appendix V.S.A. § 3-106