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Sully County, SD

Sully County property tax appeal 2027: deadline, forms and how to file

Scan from recent salesFacts not yet verified by a person — confirm on your notice

To appeal a Sully County assessment, file with the Local Board of Equalization; in South Dakota the deadline is the Thursday before the third Monday in March. Confirm the exact date on your notice or with the assessor; we add each county's 2027 date here when it is published.

Data as of 20 Oct 2026 · the Sully County assessor
Your home

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Free. We compare the value on your notice with recent sales of similar homes nearby and tell you whether an appeal is worth filing. Have your assessment notice and tax bill handy.

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How to file

How to file in Sully County

  1. Step 1

    File the appeal

    Use the method your notice lists, by the deadline on the notice.

  2. Step 2 · before the hearing

    Prepare and submit your evidence

    Comparable assessed values, photographs of condition issues and recent sales where they are public. Ask the appraisal office for the evidence it will use.

  3. Step 3

    Meet, then hear

    An informal review usually comes before a formal hearing; most reductions happen at the informal stage.

Before you file: how to read your notice · evidence that works · informal vs formal hearing · when not to appeal

Questions

Sully County questions

Data as of 20 Oct 2026 · South Dakota statutes
When is the property tax appeal deadline in Sully County?

South Dakota law sets it: Written appeal received by the clerk by the Thursday before the third Monday in March, postmark accepted (SDCL 10-11-16); first Tuesday in April where a consolidated board sits (10-11-67). Confirm the exact date on your notice or with the assessor.

Who hears a appeal in Sully County?

The Local Board of Equalization hears the first appeal. Filing rules: SDCL 10-11-16, 10-11-26.

What value should I compare on my South Dakota notice?

The figure labeled “Full and True Value”. South Dakota appeals are argued against market value as of November 1 of the year before the assessment (SDCL 10-6-105), and comparable assessments of similar homes are also a recognized argument.

Your home

Check whether yours is over-assessed

Nearby

Nearby counties

Potter County · Hughes County · Hyde County · Stanley County · Dewey County · Walworth County · Faulk County

Sources
  1. SDCL 10-6-104 (full and true value)
  2. SDCL 10-6-105 (November 1 valuation)
  3. SDCL 10-6-119 (fair market value)
  4. SDCL 10-6-121 (sales ratio)
  5. U.S. Census Bureau, county population estimates (2024) and county gazetteer (2024).