Rate Breakdown

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

How Property Tax Works in Sully County

In Sully County, property taxes are determined by a combination of the property's assessed value and the local mill levy. Annually, the County Director of Equalization assesses the market value of all real property to ensure that the tax burden is distributed fairly. Once the total assessed value is established, taxing entities—including the county, school districts, and townships—determine their budget requirements. These requirements are divided by the total taxable valuation of the jurisdiction to establish the mill rate. One mill is equal to $1 of tax for every $1,000 of assessed value. Your final tax bill is calculated by multiplying your property’s assessed value by the aggregate mill levy applicable to your specific location.

Available Exemptions

South Dakota provides several relief programs to help eligible residents manage their property tax obligations. These exemptions are designed to assist specific populations, provided they meet state-mandated residency and income criteria:

• Homestead Exemption: Available to property owners who occupy their home as their primary residence.
• Senior Citizens and Disabled Persons Tax Freeze: This program freezes the valuation of a primary residence for qualifying seniors (age 65+) and individuals with disabilities, preventing tax increases due to rising property assessments.
• Disabled Veterans Exemption: Veterans who have a service-connected disability rated at 100% by the U.S. Department of Veterans Affairs may qualify for a significant reduction in property taxes on their primary residence.

Applicants should contact the Sully County Treasurer’s office to confirm eligibility requirements and submit the necessary documentation by the annual state deadlines.

Payment Schedule & Deadlines

Property taxes in Sully County are billed annually and may be paid in two installments. To avoid interest and penalties, payments must adhere to the following schedule:

• First Half: Due by April 30th.
• Second Half: Due by October 31st.

If you choose to pay the full amount at once, it must be submitted by the April 30th deadline. Failure to pay by these dates results in the accrual of interest, which is calculated at a rate established by South Dakota state law. Continued delinquency may eventually result in a tax deed process, where the county takes legal action to collect unpaid balances.

Appealing Your Assessment

If you believe the assessed value of your property is inaccurate or exceeds its true market value, you have the right to appeal. The process begins with an informal review with the Sully County Director of Equalization. If the issue remains unresolved, you may formally appeal to the Local Board of Equalization, which typically meets in the spring. If you are still dissatisfied with the decision, you may escalate your appeal to the County Board of Equalization and, subsequently, the state Office of Hearing Examiners. It is essential to provide documentation—such as recent appraisals or comparable sales data—to support your claim during these hearings.