If you have been watching the Indianapolis housing market this spring, you have seen something homeowners have not seen in years: prices that are barely moving. Per Redfin, over the three months ending May 2026, the Indianapolis median sale price was $255,000, up just 1.9% from the same period a year earlier. Price per square foot rose only 0.7%, to $144.
The natural conclusion is that assessments should finally flatten out too. That conclusion is wrong — or at least premature — because of how Indiana's assessment calendar actually works. The market you are living in right now will not show up on a Form 11 until 2027, and even then, mechanisms other than the market can push your assessed value up. Here is the full picture.
The Indianapolis Market in Mid-2026
The data month matters, so let's be precise. Redfin's figures for the three months ending May 2026 show a market that has cooled without cracking:
Volume softened slightly — 3,150 homes sold in May 2026 versus 3,238 in May 2025 — and homes are sitting a full week longer before going under contract. This is not a declining market, but it is no longer the market that drove double-digit assessment growth. Roughly flat prices, slower absorption, more negotiating room. For broader statewide context, see our spring 2026 housing market update.
So why won't your next assessment notice reflect this?
The Lag: Assessments Trail the Market by Roughly a Year
Indiana revalues property every year through annual trending (formally, annual adjustments). Assessors do not guess at current values — they run ratio studies comparing assessed values to actual arm's-length sales, then adjust by township and property class until assessments line up with the market. The catch is the sales window.
The DLGF's annual adjustment process for the January 1, 2026 assessment date used sales from January 1, 2025 through December 31, 2025. Following the same pattern, the January 1, 2027 assessment will trend on calendar-2026 sales — the flat market you are watching right now. Each assessment is a snapshot of the previous year's market. Here is the full timeline:
| Assessment date | Sales window for trending | Form 11 mailed | Bills payable |
|---|---|---|---|
| Jan 1, 2025 | Calendar 2024 sales | 2025 | 2026 |
| Jan 1, 2026 | Calendar 2025 sales | 2026 | 2027 |
| Jan 1, 2027 | Calendar 2026 sales | 2027 | 2028 |
Two practical consequences fall out of this table:
- The Form 11 you received (or will receive) in 2026 reflects 2025 sales, when the market was still appreciating. A flat spring 2026 does nothing to soften it. If yours arrived in Marion County, our guide to the 2026 Form 11 notices in Indianapolis covers what to check.
- Today's flat market shows up on your 2027 Form 11 — the January 1, 2027 assessment, billed in 2028. That is when trending factors for Indianapolis townships should compress toward zero, if the market stays flat through December.
Note
Ratio studies run at the township and property-class level, not citywide. A flat citywide median can hide townships that are still appreciating and townships that are declining. Your 2027 trending factor depends on sales in your township for your property class — not on the headline number.
Why "Flat Market" Does Not Mean "Flat Assessment"
Even in a genuinely flat sales environment, two other mechanisms can push your 2027 assessed value higher.
DLGF cost-table changes move values independently of sales
Indiana assessors value structures with the cost approach, built on DLGF-published cost schedules. The DLGF updated its cost schedules for the January 1, 2026 assessment date, and those changes flow into bills payable in 2027 regardless of what the local market did. We broke down the mechanics in our explainer on the DLGF 2026 cost-schedule reset.
The apartment sector shows how large these non-market moves can be. According to Faegre Drinker's analysis, the Marion County Assessor added nearly $2 billion of assessed value to roughly 1,000 Indianapolis apartment complexes for the 2025 assessment date after the DLGF removed a sizeable adjustment from its base rates — apartment base rates rose about 32% in 2025, with further increases of 4% to 20% already built into the January 1, 2026 tables. None of that was driven by a hot sales market. We cover the follow-on effects in our post on the 2027 second jump in Indianapolis apartment assessments.
Trending corrects level, not errors
Trending adjusts your value toward the market given the data on your record card. If your card overstates square footage, grade, or condition, a flat trending factor just carries that error forward another year.
How to Sanity-Check Your Assessment Against Actual Sales
The good news about a flat market: it makes over-assessment easy to spot. The test is simple — would your property sell today for its assessed value?
- Pull your assessed value from your most recent Form 11 or your county's records.
- Find 3–5 recent arm's-length sales of comparable homes in your township — similar size, age, construction grade, and condition. Prioritize sales from the trending window that produced your assessment.
- Adjust for meaningful differences (finished basement, garage bays, lot size) and compare. If comparable homes are selling at or below your assessed value, you have a case.
- Check the record card inputs — square footage, grade, year built, features — because a flat market cannot fix a wrong card.
Tip
In a market rising 10% a year, an assessment that overshoots by 8% gets "rescued" by appreciation before your appeal is heard. At 1.9% growth, that cushion is gone. Flat markets are when assessment errors stop hiding — and when comparable-sales evidence is at its strongest, because the sales you cite still reflect current value by the time a board reviews them.
When a Flat Market Becomes Appeal Evidence
A flat market is not itself grounds for appeal — Indiana asks whether your assessed value exceeds market value-in-use, not whether it grew faster than the median. But mid-2026 conditions sharpen three specific arguments:
- Cost approach above market. If the 2026 cost-schedule reset pushed your value above what comparable homes actually sell for, the sales evidence generally controls when it points lower.
- Stale trending overshoot. An assessment trended on strong 2025 sales may already exceed what your home would bring in the softer 2026 market.
- Days-on-market and concessions. Homes sitting 28 days instead of 21, with more price reductions, are context a board understands when you argue the top of the prior year's range no longer holds.
Warning
Deadlines are unforgiving. The Marion County appeal deadline for 2025 assessed values was June 15, 2026 — that window has closed. But the January 1, 2026 assessment (payable 2027) gets its own Form 11 and its own appeal window, and the 2027 assessment after that. Missing one cycle does not mean accepting the next one.
Check Your Number Before the Next Form 11 Lands
You do not need to wait for 2027 to find out whether your assessment tracks the market. Start with our Indiana property explorer or go straight to Marion County to see parcel-level assessed values across your neighborhood.
Our property lookup tool puts your assessed value next to comparable sales so you can run the sanity check above in minutes. And if the numbers do not line up, our tax appeal service assembles the comparable-sales evidence and files on your behalf — before the deadline, with the flat-market data working in your favor.