First half, or full installment, is due to the Treasurer's Office by January 31st. For taxpayers in the towns of Dairyland and Highland, January payment is paid to the local town treasurer, as noted on tax bill. The second installment is due by July 31st. If your first installment is delinquent, then the second installment option (interest free) is lost and interest begins accruing at one percent (1%) per month on the entire balance due until paid in full. If your second installment is delinquent, you will accrue interest at one percent (1%) per month on the balance due, dating back to February 1st.