Indiana's property tax system affects every property owner in the state. Whether you own a home in Marion County, farmland in Tippecanoe County, or a commercial building in Allen County, understanding how assessments work is the first step to ensuring you're paying your fair share.
What Is the Market-Value-in-Use Standard?
Unlike some states that assess property at a percentage of market value, Indiana uses a market-value-in-use standard. This means your property is assessed based on its value in its current use, not its highest-and-best-use value.
For most residential properties, this distinction doesn't matter much — a home's current use is as a residence. But for agricultural land, the difference can be significant. Farmland is assessed based on its productivity as farmland, not what a developer might pay for it.
Who Determines Your Assessment?
Each of Indiana's 92 counties has a county assessor elected to a four-year term. The assessor's office is responsible for:
- Discovering and listing all real property in the county
- Determining the assessed value of each parcel
- Maintaining property records and maps
- Processing assessment appeals
The Indiana Department of Local Government Finance (DLGF) oversees the assessment process statewide, setting guidelines and reviewing county-level results.
The Assessment Timeline
Indiana property assessments follow an annual cycle:
- January 1 — Assessment date. Your property's value is determined as of this date.
- March-April — Assessment notices mailed to property owners.
- 45 days after notice (or June 15) — Deadline to file a Form 130 appeal, whichever is later.
- Throughout the year — PTABOA hearings for filed appeals.
- Following year — Tax bills reflect the assessed values.
How Is Your Property Valued?
Assessors use three standard approaches to determine value:
Sales Comparison Approach
The most common method for residential properties. The assessor compares your property to similar properties that recently sold in your area. Adjustments are made for differences in size, condition, age, and features.
Cost Approach
Used primarily for newer or unique properties. The assessor estimates what it would cost to replace your building, subtracts depreciation, and adds the land value.
Income Approach
Used for commercial and industrial properties that generate rental income. The assessor capitalizes the property's net operating income to estimate value.
Is Your Assessment Fair?
Your assessment should reflect what a willing buyer would pay a willing seller for your property in its current use. Signs your property might be over-assessed include:
- Your assessed value is higher than comparable sales in your neighborhood
- Your property has condition issues not reflected in the assessment
- The assessor's records contain errors (wrong square footage, bedroom count, etc.)
- Similar properties in your area are assessed significantly lower
AribaTax analyzes 3.7 million Indiana parcels to identify properties that may be over-assessed. Our Tax Appeal Automation product can check your assessment against comparable sales and automatically file a Form 130 appeal if the evidence supports it.
How to Check Your Assessment
You can look up your property's current assessment through:
- Your county assessor's website
- The AribaTax Property Lookup tool, which covers all 92 counties in one search
- The DLGF's Indiana Gateway assessment portal
Understanding Your Tax Bill
Your property tax bill is calculated by multiplying your assessed value by the local tax rate, then applying any applicable deductions (homestead, mortgage, over-65, etc.). The formula:
Net Assessed Value x Tax Rate = Property Tax
Indiana also has circuit breaker caps that limit property taxes:
- 1% of assessed value for homesteads
- 2% for residential rental and agricultural
- 3% for all other property
What to Do If Your Assessment Is Wrong
If you believe your assessment is inaccurate, you have options:
- Informal review — Contact your assessor's office to discuss the assessment. Sometimes errors can be corrected without a formal appeal.
- Form 130 appeal — File a formal appeal with your county's Property Tax Assessment Board of Appeals (PTABOA).
- Indiana Board of Tax Review — If the PTABOA result is unfavorable, you can appeal to the state level.
Our Tax Appeal Automation product handles the entire process, from identifying over-assessments to filing Form 130 petitions with supporting comparable sales evidence.
Assessment Equity Matters
Fair assessments aren't just about individual properties. When some properties are over-assessed and others under-assessed, the tax burden shifts unfairly. The IAAO (International Association of Assessing Officers) sets standards for assessment equity, including metrics like the Coefficient of Dispersion (COD).
Our Assessment Equity Audits product helps county assessors measure and improve assessment uniformity across their jurisdictions.
Explore Your County
Ready to look at assessment data for your county? Browse property data for any of Indiana's 92 counties:
- Marion County — Indianapolis and surrounding areas
- Hamilton County — Carmel, Fishers, Noblesville
- Allen County — Fort Wayne metropolitan area
- Lake County — Gary, Hammond, Crown Point
- St. Joseph County — South Bend, Mishawaka