Marshall County — Plymouth, Bremen, Bourbon, Culver, and the rural townships in between — is in the middle of a cyclical reassessment cycle in 2026. Indiana law requires every county to physically inspect every parcel on a four-year rolling cycle, with roughly 25% of parcels reviewed each year. That means Marshall County owners aren't all getting the same kind of Form 11: some parcels are seeing the standard cost-table-driven AV move, while others are seeing the result of a fresh on-site inspection layered on top of the cost-table reset.
The result for 2026 is unusually uneven movement across the county, and a higher rate of "first time the assessor has been here in four years" surprises than in non-reassessment years. The appeal deadline is June 15, 2026, or 45 days from the mailing date — whichever is later.
Marshall County Assessor: 112 W Jefferson St, Room 307, Plymouth, IN 46563, (574) 935-8525. The 2026 Marshall County Budget Order issued December 31, 2025 — meaning tax rates for the spring 2026 bill are now locked in. Form 11 notices typically arrive in the middle of April.
What the Cyclical Reassessment Actually Does
Most owners think of "assessment" as a paperwork exercise. The cyclical reassessment is different: it's an actual on-site inspection in which the assessor's staff or a contracted vendor walks the parcel, measures improvements, photographs condition, and updates the property record card.
Practical consequences:
- Square footage corrections: a finished basement, attached garage, or unpermitted addition that wasn't on the prior record card gets added.
- Condition grade updates: a property that was graded "average" four cycles ago may be regraded if condition has improved (or declined).
- Class-code corrections: a property that converted from rental to homestead — or vice versa — gets the class code updated.
- Outbuilding inventory: pole barns, sheds, detached garages, and accessory structures get re-counted.
If your parcel is in the 2026 inspection slice, the Form 11 you receive in April will reflect both the statewide cost-table reset and any inspection-driven changes. Many of the largest 2026 surprises in Marshall County will trace to the inspection rather than the cost tables.
What to Check on Your Marshall County Form 11
The standard Form 11 walkthrough applies. Marshall-specific additions:
Square Footage and Improvement Inventory
This is the highest-yield check in a reassessment year. Pull your prior-year property record card from the Marshall County Beacon GIS portal and compare line-by-line against the new one. Common errors:
- Finished-basement square footage attributed to "above-grade" living area.
- An attached garage counted as additional living area.
- A detached structure listed twice.
- A demolished outbuilding still on the record.
Each of these is a correctable factual error — usually resolvable through the assessor's office without a formal appeal.
Grade and Condition
Marshall's older housing stock — particularly in Plymouth's central neighborhoods and the surrounding farm towns — is sensitive to grade and condition assumptions. A "good" condition rating on a property with deferred roof, mechanical, or foundation issues is appealable evidence. Photos help.
Property Class Code
Verify Line 5 of the Form 11. The class code determines your cap tier (1% homestead, 2% other residential and farmland, 3% commercial). Misclassification is the single most common appeal-winning issue.
Homestead and SB 1 Credit
If you bought in 2025 and didn't file Form HC-10, you've lost the homestead deduction, the supplemental homestead deduction (now 40% in 2026), and the SB 1 $300 credit on your spring bill. Fix this with the auditor before May 10.
Marshall County Tax Rate Context
Marshall County's combined rates run modestly below the statewide median, with meaningful variation between Plymouth (city) and the surrounding townships.
For appeal economics: a $10,000 AV reduction translates to roughly $150–$220 of annual tax savings for non-cap-bound parcels. Homesteads at or near the 1% cap will see less direct benefit.
The Plymouth, Bremen, Bourbon, Culver Picture
| Area | Character | 2026 considerations |
|---|---|---|
| Plymouth (city) | County seat, dense SFR, downtown, schools | Cost-table moves on older improvements; cyclical inspection slice |
| Bremen | Smaller incorporated town, Amish-adjacent commerce | Mixed residential/light commercial |
| Bourbon | Town center, surrounding rural | Modest moves; ag base rate dominant outside town |
| Culver | Lake Maxinkuckee, Culver Academies | Lakefront land rates respond to thin sales market |
| Rural townships | Ag, rural residential, farms | Farmland base rate — $2,120/acre for 2026 — drives Ag AV |
Lake Maxinkuckee parcels deserve special attention. Lakefront and lake-view land valuations are unusually sensitive to a small handful of recent sales, and a single high-dollar transaction can reset the neighborhood code's land rate for every parcel in the coding area.
The Amish-Adjacent Submarket
Marshall County borders Indiana's Amish settlement areas to the east and south. While the Amish community is concentrated in adjacent counties, the spillover effects — agricultural operations, supplier businesses, and a meaningful cash-economy housing market — show up in Marshall's rural commercial and farmland AVs. Owners of properties tied to that economy should pull comparable sales carefully; the reported transaction record may understate true market activity.
SB 1 and the 2026 Spring Bill
The reform package signed in 2025 takes effect on the spring 2026 tax bill (due May 10):
- 10% supplemental homestead credit, capped at $300 per qualifying homestead.
- Supplemental homestead deduction increases from 35% to 40% of eligible AV.
- Business personal property exemption rises to $1M in 2026 (and $2M in 2027).
Walkthrough in the SB 1 explainer and the $300 credit guide.
Marshall County Appeal Logistics
Where to File
Form 130 is filed with the Marshall County Assessor's Office at the Plymouth address above. Hand-delivery, mail, and (where available) online submission are accepted. Appeals are time-stamped on receipt — not postmark.
What to Include
- Form 130, one per parcel
- Stated grounds: market value, error, or uniformity
- 3–5 comparable sales within the same neighborhood code
- Photos for condition-based arguments
- For income property: rent roll and operating statement
- For inspection-driven changes: corrected measurements or contractor estimates if asserting different square footage
After Filing
PTABOA acknowledges within 30 days. Many cyclical-inspection corrections settle informally before reaching a hearing. If a formal hearing is needed, expect several months of lead time. Post-decision, the Indiana Board of Tax Review is the appeal escalation within 30 days.
Decide Early
The optimal Marshall County filing window is late April through late May: Form 11 in hand, well before the June deadline, and time to pull supporting documents. Procrastinators end up filing without comparable sales and lose appeals they could have won.
If you'd rather not assemble the package yourself, Property Lookup compares your parcel to recent sales, and Tax Appeal Automation builds the Form 130 evidence file on contingency.
Find Your Marshall County Property
- Marshall County overview
- Marshall residential parcel data
- Marshall commercial parcel data
- Marshall industrial parcel data
- Marshall agricultural parcel data