Important Tax Deadlines - Treasurer

(Please see https://adacounty.id.gov/treasurer for the latest version of this information)

A A A
Home > Treasurer > Tax Collection > Important Tax Deadlines

Important Tax Deadlines

  • January 1st – December 31st – In the State of Idaho, the property tax year runs from January 1st to December 31st, a calendar year.

Primary Tax Roll Bills 

  • 4th Monday in November – Tax bills for the “primary” assessment roll are mailed on or before the fourth Monday of November each year

Subsequent Tax Roll Bills 

  • Issued in January

Missing Tax Roll bills

  • Issued in February

Tax Due Dates 

  • December 20th: Primary Tax Roll – Last day to pay full-year tax payment or first one-half tax payment without late charge and interest.
  • February 20th: Subsequent Tax Roll – Last day to pay full-year tax payment or first one-half tax payment without late charge and interest.
  • March 20th: Missed Tax Roll – Last day to pay full-year tax payment or first one-half tax payment without late charge and interest.
  • June 20th: 2nd Half Payment – Last day to pay prior year second half tax payments without late charge and interest. Calculated from January 1st.

If the 20th falls on a weekend, the payment will be timely posted if postmarked on or before the 20th on the first business day following the 20th.

Circuit Breaker

  • April 15th – Last day to apply for Homeowner’s Exemption or Circuit Breaker Benefits for the current year’s taxes.
  • January 1st – First day to apply for Homeowner’s Exemption or Circuit Breaker Benefits for the current year’s taxes.

Assessment Appeal

  • 4th Monday in June – This is the last day to submit a property value assessment appeal.
  • 4th Monday in May – This is the first day when you may submit an appeal of current year assessed property values.