Madison County sits in a position no other central-Indiana county quite shares. Anderson — the county seat and population center — spent the second half of the twentieth century built around General Motors plants and the supplier ecosystem that surrounded them. The retraction of that industrial base reshaped the local tax base over the past two decades, and the county's current assessment cycle plays out against that backdrop. The 2026 Form 11 notices, mailed in mid-April, will reflect the same statewide DLGF cost-table reset that's pushing AVs upward across Indiana — but the local mix is unlike either the high-growth donut counties to the south or the rural counties further north.
The appeal deadline is June 15, 2026, or 45 days from the mailing date — whichever is later.
Madison County Assessor: 16 East 9th, County Courthouse, Anderson, IN. Tax payments are handled through the Madison County Treasurer; assessment questions go to the Assessor's office. There are no township-level assessors handling appeals — file Form 130 with the county.
What's Driving 2026 Madison County AVs
Three local dynamics are shaping how the statewide reset plays out here.
Anderson's Residential Reset
Anderson's housing stock is older than the state median — a function of the city's mid-century population peak. The DLGF cost-table reset disproportionately moves the improvement value on older, larger homes because depreciation tables and replacement-cost factors interact in ways that don't always reflect current condition. Anderson owners with homes built before 1970 should look closely at the improvement-value line on the Form 11.
Industrial and Commercial Re-Assessment
The legacy industrial corridor — including former GM properties that have been redeveloped or repurposed — sits in a tax-base category that's notoriously hard to value. Reassessments in 2026 will shift some of these parcels meaningfully, in either direction. Owners of commercial or industrial parcels should compare the AV change against the property's actual income performance and operating reality.
Suburban Growth at the South End
Pendleton and the southern Madison County corridor — closer to the Indianapolis metro — have seen residential growth and rising sale prices over the past several years. The 2026 assessment cycle catches these markets at a higher comparable-sales window than the prior cycle, pushing AVs upward.
What to Check on Your Madison County Form 11
The general Form 11 day-of-arrival checklist applies. Madison-specific items worth verifying:
Property Class Code
Anderson's mix of single-family, duplex, and small-multifamily property in older neighborhoods produces frequent class-code drift. A duplex coded as commercial gets the 3% cap; coded as residential it gets 2%. A converted garage or accessory unit miscoded changes the calculation entirely. Verify the class on Line 5 of the Form 11.
Homestead Status
If you bought in 2025, you must have filed Form HC-10 to claim the homestead deduction. Without it, you lose the $48,000 deduction, the 35-to-40% supplemental homestead deduction, and the SB 1 $300 credit on the spring 2026 bill. Madison County's higher transaction volume in the south end means more new buyers and more missed filings.
Improvement Value on Older Homes
For Anderson homes 50+ years old, the gross improvement value can outrun what the property would actually trade for — particularly if condition is below the assumed standard for the grade and class. Photos of structural, roof, mechanical, or foundation issues are appeal-worthy evidence.
Land Rate by Neighborhood
Madison's neighborhood codes shifted in some submarkets ahead of this cycle. A land-only spike with little improvement movement usually indicates a code update; pull the underlying neighborhood sales to test whether the new rate is supportable.
Madison County Tax Rate Context
Madison County's combined rates run noticeably higher than the statewide median — closer to the upper-tier counties than the rural-low-rate group. Anderson's median effective rate of roughly 1.12% sits above Indiana's median of 0.99%.
For appeal economics, this means the per-AV-dollar payoff is meaningful: a $10,000 AV reduction translates to roughly $220–$300 in annual tax savings for non-cap-bound parcels. For homesteads near the 1% cap, the math compresses — the appeal guide walks through how to determine if you're cap-bound.
The Madison County Submarket Picture
| Area | Character | 2026 pressure |
|---|---|---|
| Anderson (city) | Older SFR, legacy industrial, downtown | Cost-table moves on older improvements |
| Pendleton | Growth corridor, newer SFR, school-driven demand | Comparable-sales window pushing upward |
| Elwood | Smaller industrial city, stable residential | More moderate movement |
| Alexandria / Summitville | Small-town residential, rural-adjacent | Land rate plus modest improvement moves |
| Rural townships | Ag, rural residential | Farmland base rate drives Ag AV |
Comparable-sales work in Madison County must respect these submarket lines. A Pendleton sale doesn't defend an Anderson AV, and a downtown Anderson comp doesn't defend a Pendleton subdivision parcel.
SB 1 and What It Means for Madison Homesteads
The 2026 spring tax bill — due May 10 — will include the 10% supplemental homestead credit, capped at $300, for every qualifying homestead. The supplemental homestead deduction also bumps from 35% to 40% of eligible AV. For an Anderson homestead with a $150K AV near the 1% cap, the practical bill-side effect is real but not transformative — these reforms slow the upward pressure rather than reverse it.
Madison County Appeal Logistics
Where to File
Form 130 is filed with the Madison County Assessor's Office at the courthouse. Hand-delivery and mail are both accepted; appeals are time-stamped on receipt, not postmark. Confirm whether online filing is currently available before relying on it.
What to Include
- Completed Form 130 (one per parcel)
- Stated grounds: market value, assessment error, or uniformity
- 3–5 comparable sales within the same neighborhood code
- Photos for any condition-based argument
- For income property: rent roll and operating statement
- Optional: USPAP-compliant appraisal for higher-value cases
After Filing
PTABOA acknowledges within 30 days. Settlement offers commonly arrive 60–90 days after filing if written evidence supports a reduction. Hearings, if needed, schedule out further. If PTABOA rules against you, the Indiana Board of Tax Review is the next step within 30 days.
Decide Early — Don't Wait for the Bill
The single most common appeal mistake is waiting for the spring tax bill to arrive before deciding to appeal. By that point, the appeal window is partway gone and the assessor's staff is harder to reach. The optimal Madison County filing window is roughly April 25 to May 25 — Form 11 in hand, well before the June deadline.
If you're not sure whether your AV warrants appeal, Property Lookup compares your parcel to recent sales in your neighborhood code. Tax Appeal Automation handles the Form 130 + evidence package on contingency for owners who'd rather not assemble it themselves.
Find Your Madison County Property
- Madison County overview
- Madison residential parcel data
- Madison commercial parcel data
- Madison industrial parcel data
- Madison agricultural parcel data