If your 2026 Indiana commercial assessment jumped and you only argued "it's too high," you left your strongest tool on the table. For income-producing property, the income approach often produces a materially lower value than the cost approach the assessor started with. This guide shows how to build that case and why it wins.
The Three Approaches and the Lowest-Value Rule
Indiana assessors generally begin with the cost approach: land value plus the depreciated cost to replace the improvements. It is fast to apply across thousands of parcels, but it ignores how an income property actually performs in the market.
For income-producing property, the assessor must consider all three approaches and apply the lowest indicated value:
| Approach | What it measures | Typical use |
|---|---|---|
| Cost | Replacement cost less depreciation, plus land | Default starting point |
| Income | Net operating income capitalized at a market cap rate | Rented commercial, multifamily, retail |
| Sales | Comparable arm's-length sales | Supports or checks the other two |
The practical takeaway: if you can demonstrate that the income approach indicates a value below the cost-based assessment, that lower number should control. Many owners never present income evidence at all, so the cost figure stands by default.
The Core Formula: Value = NOI / Cap Rate
The income approach capitalizes net operating income at a market capitalization rate:
Value = Net Operating Income / Cap Rate
Two levers move the result:
- Higher vacancy lowers NOI, which lowers value.
- Higher cap rate divides NOI by a larger number, which also lowers value.
A simple illustration: a property with $300,000 of NOI capitalized at a 7% rate indicates a value of approximately $4.29 million. The same NOI at an 8.5% rate indicates approximately $3.53 million. Cap-rate support is not a footnote; it is half of your case.
A worked example helps make the stakes concrete. Suppose the cost approach put your property at $5.0 million, but your actual NOI is $300,000 and the supportable market cap rate is 8.0%. The income approach indicates $3.75 million. Under the lowest-value rule, the $3.75 million figure should prevail, a reduction of $1.25 million in assessed value. At the 3% cap on the resulting bill, that difference flows straight to your bottom line.
Building Income-Approach Evidence
A PTABOA panel weighs documented financials far more heavily than assertions. The goal is to make your NOI and cap rate so well-supported that the panel can adopt them without guessing. Assemble:
Rent roll
A current rent roll showing each unit or suite, lease terms, contract rent, and occupancy status. This is the foundation for gross potential income.
Operating statement
Two to three years of actual operating statements. The panel wants to see real revenue and the expenses required to produce it, not pro forma optimism.
Vacancy and collection loss
Document actual vacancy and any collection losses. If your submarket carries elevated vacancy, support it with the rent roll and, where possible, market data.
Market cap-rate support
This is where appeals are won or lost. Bring evidence of the cap rate buyers actually pay for comparable property in your market. A defensible cap rate, properly sourced, can swing the indicated value substantially. Generic national averages rarely persuade a panel; tie your rate to your property type, your submarket, and the assessment date.
Sales as a cross-check
Even when the income approach drives your value, comparable sales of similar income property strengthen the case. They corroborate your cap rate and give the panel a second, independent path to the same conclusion. The methodology for assembling defensible comparables is covered in comparable sales evidence for PTABOA appeals.
Warning
Do not capitalize a single unusually good year. Assessors and PTABOA members will scrutinize whether your NOI reflects stabilized, sustainable performance or a cherry-picked peak. Inconsistent numbers can sink an otherwise solid appeal.
Stabilized vs. Actual NOI
There is a real tension here. Actual NOI reflects what the property earned, including current vacancy and any non-recurring items. Stabilized NOI reflects what the property should earn at normal, sustainable occupancy and expense levels.
- If your property is genuinely struggling with above-market vacancy that is likely to persist, actual NOI tells the honest story and supports a lower value.
- If a single tenant just vacated and you expect to re-lease, the panel may favor stabilized NOI, which can be higher.
Decide which framing your facts support before you walk in, and be ready to explain why. The credibility of your NOI selection often matters as much as the number itself.
Expense treatment deserves the same care. Capitalize the expenses a typical operator would incur, and be ready to explain any non-recurring or owner-specific costs you have removed. A reconstructed operating statement that a reviewer can follow line by line carries far more weight than raw bookkeeping totals.
When the Income Approach Beats Cost
The income approach is most powerful when:
- The cost approach overstates value because the building is older, functionally dated, or carries deferred maintenance that depreciation tables understate.
- Market rents or occupancy have softened since the assessment date.
- Cap rates have risen, which mechanically lowers capitalized value even when NOI is steady.
For multifamily specifically, the income approach is frequently the deciding evidence. See our detailed walkthrough in the Indianapolis multifamily income-approach appeal guide.
The 3% Cap Backstop
Commercial and industrial property sits in the 3% circuit-breaker cap tier in Indiana. The cap limits your bill to a percentage of gross assessed value, but it does not fix an inflated assessment. If your assessed value is too high, the 3% applied to that inflated base still overcharges you. Winning the assessment fight is what actually lowers the bill.
In Marion County, the 2025 assessment cycle added approximately $5.5 billion in assessed value to commercial and industrial property. Many of those increases are appealable. For the county-specific picture, see the Marion County commercial and industrial assessment breakdown and the Mile Square commercial recovery analysis.
Filing and Escalation
Commercial appeals are filed using Form 130 and heard first by the county PTABOA. If the PTABOA result is unsatisfactory, you escalate to the Indiana Board of Tax Review. The mechanics and deadlines for that path are covered in PTABOA vs. Indiana Board of Tax Review escalation and the broader 2026 Indiana property tax appeal guide.
The state's official overview of the process is the DLGF assessment appeals fact sheet, and the Indiana Board of Tax Review publishes guidance for escalated cases.
Find Your Property
Start by pulling your assessment record. Browse the statewide Indiana property explorer or jump straight to a county such as Marion County to see your current assessed value, classification, and history.
When you are ready to act, our property lookup tool surfaces the data you need to evaluate an appeal, and our tax appeal service helps you assemble income evidence and file correctly.