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.
Marion County PTABOA appeals are time-stamped on receipt, not postmark. Mail submitted June 14 has been rejected when it arrived June 16. Hand-delivery or certified mail with return receipt is the only safe option in the final week.
What Makes Marion Different
The general Form 11 day-of-arrival checklist applies statewide. Marion County adds three local complications.
1. Nine Township Assessors
Most Indiana counties handle assessment at the county level. Marion County is one of the few that still operates township assessors alongside the county assessor's office. 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 town of Eagle Creek |
| Warren | Far east (Cumberland area) |
| Washington | North-central, Broad Ripple, Meridian-Kessler |
| Wayne | West Indy, including Speedway |
Your Form 11 lists the township assessor responsible for your parcel. Call that township's office for any informal correction — calling the central Marion County Assessor on a township-coded parcel typically gets bounced back.
2. Indianapolis Has the Highest Tax Rates in the State
Marion County's combined tax rates run $30–$45 per $1,000 of net AV depending on the township and taxing district — roughly 50–80% above the statewide median. 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 Marion County appeals deliver $30–$45 of tax savings per $1,000 of AV reduction, which is among the highest payoffs per dollar of appeal effort in the state.
3. Marion County's PTABOA Backlog
Marion's Property Tax Assessment Board of Appeals processes more appeals than any other county in Indiana — typically 8,000+ in a normal cycle, with this year's caseload likely to exceed 12,000 given the assessment surge. 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 the assessor responsible and can affect millage. 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
Marion has the highest rate of homestead deduction filing errors in the state — 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 $300 credit, and the 2% or 3% cap instead of 1%. Fix this before the May 10 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
Marion County requires Form 130 to be filed with the Marion County Assessor's Office — not the township assessor, despite township-level assessments. 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
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- Marion commercial parcel data
- Marion industrial parcel data
- Marion agricultural parcel data