Rate Breakdown

Property taxes in Adams County are calculated by multiplying the assessed value (minus exemptions) by the total local millage rate.

How Property Tax Works in Adams County

In Adams County, Idaho, property taxes are levied on the total assessed value of real estate, including vacant land and structures. The county uses a two-stage valuation system: the city or county assessor evaluates the market value of each property as of the public record date (typically April 1st). The assessed value is then rounded to the nearest thousand dollars and multiplied by the county’s official millage rate, expressed in mills (one mill equals one-tenth of a cent per dollar of assessed value).

The millage rate is determined by the county board of assessors in coordination with the Idaho State Board of Equalization. In 2024, Adams County’s combined millage rate for property taxes is 19.3 mills (including county, school district, and special district levies). To calculate the annual tax you pay, divide the assessed value by 1000 and multiply by the millage rate: Estimated Property Tax = (Assessed Value / 1,000) × 19.3. The result is measured in dollars and cents.

Available Exemptions

Homeowners in Adams County can apply for several exemptions that reduce the assessed value before the millage rate is applied. Idaho’s residential property tax laws allow for the following primary exemptions:

• Homestead Exemption – Applies to primary residences. The exemption is 25% of the market value for most homeowners, and up to 30% for owners who are 65 or older, enrolled in the Idaho School of Excellence (ISE) program, or receive SSI/SSDI.
• Senior Citizen Exemption – For residents aged 65+ with an assessed value of $500,000 or less. The exemption grants an additional 5% reduction after the homestead exemption.
• Disability Exemption – Available to homeowners who are physically or mentally disabled. The discount is 20% of the assessed value, regardless of age.
• Disabled Veteran Exemption – Veterans who are disabled due to service pay an exemption based on the degree of disability, ranging from 10% to 35%. Proper documentation is required.
• Home and Garden Exemption – Available if a resident spends a minimum of 3,000 hours a year in a home and garden. This exemption can reduce assessed value by 7-10%.

To qualify, homeowners must submit a written request to the assessor’s office, accompanied by required proof such as a valid driver’s license, veteran’s ID, or medical certificates. The deadline for filing exemptions is the 30th day of March each year; late requests typically result in a full-assessed-value tax for the year.

Payment Schedule & Deadlines

Adams County divides the annual property tax bill into two equal installments, each due with a single penalty if paid late. The two payment windows are:

• First installment: July 15th – covers the first half of the assessed value. Late payment incurs a 5% interest penalty on that portion.
• Second installment: February 15th (following year) – covers the remaining half. Late payment incurs a 5% penalty plus a 1% monthly interest from the due date until paid.

Property owners may choose to pay the full amount on the first due date (July 15th) to avoid any additional fees. Payments can be made online through the County Tax Portal, by mail, or in person at the County Treasurer’s office. The portal also offers auto‑pay enrollment for convenience. If a payment is missed, the county places a tax lien on the property, which can lead to a public auction if unsettled after two years. To prevent such drastic measures, contact the Treasurer’s office immediately to negotiate payment arragements or discuss any hardship circumstances.

Appealing Your Assessment

In Adams County, property owners who believe their assessed value is too high have the right to file an appeal with the Idaho State Board of Equalization (SBE) within 60 days of receiving the assessment notice. The process involves:

1. Submit a written appeal to the County Assessor’s office. Include a detailed statement of why the assessment should be lowered, referencing comparable properties, recent sales, or evidence of overvaluation.
2. Provide supporting documentation such as property appraisals, recent real estate listings, or a certified land survey.
3. Schedule a hearing with the SBE. The board will review the appeal, consider evidence, and hold an oral hearing if necessary.
4. Receive a decision within 10-12 weeks of the appeal filing. If the SBE upholds the assessment, the owner can still file a second appeal with the Idaho State Tax Board after a further 60 days. The second appeal must be in writing and if the initial assessment is maintained, the owner can again seek judicial review in the state court system.

Timeliness is critical: missing any of the deadline windows can forfeit the right to appeal. If your appeal is denied, you may still apply for an annual reconsideration by the assessor’s office if new evidence emerges after the 60-day period. The overall goal of the appeals process is to ensure fair market valuation and equitable tax burdens for all residents of Adams County.