Marion County's 2026 Form 11 Notices of Assessment hit the mail on April 28, 2026 — under two weeks from now. For most Indianapolis property owners this notice will be the first concrete look at the largest year-over-year assessed value movement in over a decade: an estimated $5.5B added to commercial/industrial parcels, $2B added to apartments, and meaningful upward pressure on residential AVs from the same DLGF cost-table reset.
You have until June 15, 2026 — or 45 days from the mailing date, whichever is later — to file a Form 130 appeal. In Marion County, where the 2026 PTABOA caseload is expected to be the largest in state history, the practical advice is: decide quickly, file early.
Warning
A USPS postmark by the deadline counts as timely filing under IC 6-1.1-36-1.5 — but a postage-meter date does not, and a lost or illegible postmark puts the burden on you. In the final week, certified mail (the certification date is statutory proof), hand-delivery, or online filing are the safe options.
What Makes Marion Different
The general Form 11 day-of-arrival checklist applies statewide. Marion County adds three local complications.
1. One Assessor, Nine Townships
A single office — the Marion County Assessor — values every parcel in the county; township assessor offices were abolished in Indiana's 2008 consolidation. But assessment data, neighborhood codes, and tax rates are still organized around the nine townships:
| Township | Coverage area |
|---|---|
| Center | Downtown Indianapolis, near-east, near-west |
| Decatur | Southwest Indy (Camby area) |
| Franklin | Far southeast (Acton area) |
| Lawrence | Northeast, including the city of Lawrence |
| Perry | South Indy (Greenwood-adjacent), Southport |
| Pike | Northwest, including the Eagle Creek area |
| Warren | Far east (Cumberland area) |
| Washington | North-central, Broad Ripple, Meridian-Kessler |
| Wayne | West Indy, including Speedway |
Your Form 11 lists your township and taxing district. The township doesn't change who assesses you — informal corrections and appeals all go through the county assessor's office — but it drives your rate and how your comparables get filtered, as the township differences guide explains.
2. High Rates Raise the Stakes
Marion County's 2026 certified combined rates run from $2.4269 to $4.2369 per $100 of net AV depending on the taxing district, per the DLGF's certified rates report. This means two things for appeals:
- More parcels are at the circuit breaker cap — at high rates, even modest AVs push gross tax above the 1%/2%/3% ceiling
- For cap-bound parcels, appeal savings are limited to the cap percentage of the AV reduction (1¢ per $1 of AV reduced for homesteads, 3¢ for commercial)
For non-cap-bound parcels, every dollar of AV reduction translates 1:1 with the tax rate — meaning a Marion County appeal saves roughly $24 to $42 per $1,000 of AV reduction depending on the district, a high payoff per dollar of appeal effort.
3. Marion County's PTABOA Backlog
Marion's Property Tax Assessment Board of Appeals handles one of the largest appeal caseloads in Indiana, and the 2026 assessment surge is expected to swell it further. Practical implications:
- Hearings are scheduled 6–12 months out
- Most cases settle on written evidence before formal hearing
- Tax payment during pendency: pay the prior year's tax × current rate; the disputed delta is escrowed until resolution
What to Check on Your Marion County Form 11
The five-item walkthrough from the statewide Form 11 guide applies — but Marion-specific details to verify:
Township Assignment
A property near a township boundary can be miscoded into the wrong township, which changes your taxing district and can change your rate. Verify the township on your Form 11 matches your physical address.
Property Class Code
Marion County's mix of property uses produces frequent class-code drift. A duplex coded as commercial instead of residential moves the property from the 2% to the 3% cap tier. A single-family converted from rental to homestead but still coded as 511 (rental) loses the 1% cap.
Homestead Status
Homestead deduction filing errors are common in Marion County, driven by the high turnover of single-family homes converting between owner-occupied and rental use. If you bought in 2025 and never filed Form HC-10, your 2026 Form 11 will show no homestead deduction, no SB 1 homestead credit, and the 2% or 3% cap instead of 1%. Fix this before the May 11 spring tax deadline.
Land vs Improvement Split
Indianapolis assessors apply land valuations by neighborhood code. A neighborhood code change between years can cause a sudden land-only spike that's worth questioning even if total AV looks reasonable.
Marion County Filing Logistics
Where to File Form 130
Form 130 petitions are filed with the Marion County Assessor's Office, which handles appeals for all nine townships. The address:
Marion County Assessor's Office City-County Building, Suite 1360 200 E Washington St Indianapolis, IN 46204
Online filing is also available through the indy.gov assessor portal. Online filings are time-stamped on submission, eliminating the mail-arrival risk.
What to Include in Your Marion Submission
- Completed Form 130 (one per parcel)
- Stated grounds: market value, property condition, or assessment error
- Comparable sales analysis (3–5 properties from the trending window)
- For income-producing property: rent roll and operating statement
- Photos documenting condition issues
- Optional: appraisal (a USPAP-compliant appraisal carries weight even at PTABOA level)
What Happens After Filing
- Within 30 days: Marion's PTABOA acknowledges the petition
- Within 60–90 days typically: an assessor representative may extend a settlement offer based on written evidence
- 6–12 months later: hearing scheduled if no settlement reached
- 30 days post-decision: window to escalate to the Indiana Board of Tax Review if PTABOA rules against you
Marion County By the Numbers
A quick orientation to the 2026 assessment landscape in Indianapolis:
| Metric | Marion County (est.) |
|---|---|
| Total parcels | ~360,000 |
| Residential parcels | ~290,000 |
| Commercial/industrial parcels | ~12,000 |
| Apartment parcels (20+ units) | ~1,000 |
| 2026 assessment increase — apartments | ~$2B added |
| 2026 assessment increase — C&I | ~$5.5B added |
| Average C&I AV change | +27% |
| Median C&I AV change | +18% |
| Annual circuit breaker cap loss (recent) | $300M+ |
Decide Now, File Early
The single most common Marion County appeal mistake is waiting until late May or early June — at which point the office is overwhelmed, the assessor's representative has no time for informal resolutions, and the risk of clerical error rises sharply. The optimal Marion filing window is between May 5 and May 25: late enough to have your Form 11 in hand, early enough to engage with a representative before the deadline rush.
If you're not sure whether to appeal, Property Lookup shows your AV against comparable sales, and Tax Appeal Automation builds the Form 130 + evidence package for you on contingency.
Find Your Marion County Property
- Marion County overview
- Marion residential parcel data
- Marion commercial parcel data
- Marion industrial parcel data
- Marion agricultural parcel data