Grant County's property tax story for 2026 sits at the intersection of two long-running trends: the post-General Motors industrial transition that Marion has been navigating since the 1990s, and the steady tax-base anchor provided by Taylor University in Upland. For 2026, Grant County property owners face the same statewide assessment dynamic — a DLGF cost-table reset driving meaningful AV growth and SB 1 property tax reform changing homestead bills — applied to a county where median home values sit well below the statewide median.
Grant County mails Form 11 notices in spring — typically mid-April. Form 130 appeals are due June 15, 2026, or 45 days after the mailing date.
Grant County's Treasurer's Tax List was last updated April 4, 2026. The Assessor's Office is at 401 South Adams Street, Room 528, Marion, IN. For most Marion homestead parcels, the median tax bill is well below the statewide average, which makes the SB 1 $300 credit a larger percentage of the typical bill than in higher-value counties.
Why Cost-Table Resets Hit Post-Industrial Markets Differently
The DLGF's 2025 cost-table update applies the same per-square-foot construction cost factors statewide. In Marion and the broader Grant County market, this creates a recurring assessment question for older industrial buildings, downtown commercial parcels, and the post-GM industrial corridor:
- Cost-based AV can drift well above market value for buildings whose original use no longer commands market demand
- Obsolescence adjustments (functional, economic, external) become the primary appeal basis
- Income-approach challenges are viable for commercial parcels with documented vacancy or sub-market rents
The general Form 11 walkthrough applies in Grant County, but the obsolescence layer carries unusually heavy weight for any commercial or industrial parcel.
Taylor University and the Upland Submarket
Taylor University in Upland is a substantial private institution whose owned real estate is largely tax-exempt. Surrounding Upland and Eastbrook district owners experience:
- Stable demand for housing serving Taylor faculty, staff, and students
- Tighter taxable base in the immediate Upland area than in other parts of the county
- Commercial demand patterns anchored to the academic calendar
For homestead owners in Upland, the 2026 Form 11 should reflect the same cost-table update as the rest of the county; the underlying neighborhood demand provides some support for the AV but does not substitute for individual record-card review.
Statewide 2026 Changes Applied to Grant County
| Change | Effect on Grant County owners |
|---|---|
| SB 1 supplemental homestead credit (10%, max $300) | Direct $300 reduction on most owner-occupied bills |
| Supplemental homestead deduction 35% to 40% | Lower taxable AV on homesteads |
| Business personal property exemption $1M (2026), $2M (2027) | Many small Marion shops and suppliers now exempt |
| Caps unchanged (1% / 2% / 3%) | Older homesteads typically cap-bound |
| DLGF cost-table reset | Meaningful AV growth on improved parcels |
For a typical Marion homestead with a tax bill in the $750–$1,400 range, the $300 SB 1 supplemental credit is a 20–40% reduction in the gross bill — a more meaningful percentage impact than the same fixed credit would have in Hamilton or Boone.
Five Items to Verify on Your Grant County Form 11
The five-step statewide Form 11 walkthrough applies. Local additions worth checking:
1. Improvement Class and Effective Age
Older Marion housing stock and downtown commercial parcels carry meaningful effective-age depreciation. Verify the depreciation tables on your record card actually reflect the building's effective age, not just its actual age.
2. Functional Obsolescence
Older industrial parcels along the former GM corridor carry functional obsolescence (low ceiling height, narrow column spacing, outdated electrical service) that is rarely captured in the assessor's mass-appraisal model without owner-supplied evidence.
3. Land Coding
Agricultural parcels in southern and western Grant County should reflect the DLGF 2026 base rate of $2,120 per acre with productivity and influence factor adjustments. Marion's transitional residential-to-rural fringe sometimes carries land-type drift between cycles.
4. Homestead Filing Status
Confirm via the County Auditor that the homestead deduction, supplemental homestead deduction (40% in 2026), and SB 1 supplemental credit are all applied. For homes purchased in 2025, the HC-10 filing at closing is essential.
5. ZIP-Level Tax Variation
Within Marion alone, the median tax bill varies by ZIP — 46952 vs 46953 vs 46901 (Kokomo border) carry different combined district rates. The statewide rate-by-county survey provides county averages; pull the district-specific rate before underwriting any parcel.
When an Appeal Is Worth Filing
For Grant County parcels, the per-parcel dollar payoff of a successful appeal is generally smaller than in higher-value counties — but the success rate for obsolescence-grounded arguments tends to be higher because the assessor's record card is more often out of step with the post-industrial reality.
A practical filter:
- Homestead AV materially above neighborhood comps: worth filing
- Older home with documented deferred maintenance: worth filing with photos
- Commercial parcel with vacancy or below-market rents: worth filing with income evidence
- Industrial parcel with functional obsolescence: nearly always worth filing
- Recently purchased parcel where AV exceeds purchase price: nearly always worth filing
Tax Appeal Automation generates the Form 130 + evidence package for parcels where the data supports a reduction.
Grant County Tax Calendar
| Date | Action |
|---|---|
| January 1, 2026 | Assessment date |
| Mid-April 2026 | Form 11 notice mailing window |
| May 10, 2026 | Spring 2026 tax installment due |
| June 15, 2026 | Form 130 appeal deadline (or 45 days after mailing) |
| November 10, 2026 | Fall 2026 tax installment due |
Filing Logistics
Form 130 appeals in Grant County are filed with the County Assessor's Office at 401 South Adams Street, Room 528, Marion. The Auditor's Office (765-668-6552) handles homestead deduction filings and the SB 1 credit application; the Assessor's Office (765-668-6556) handles assessment appeals.
After filing:
- 30-day acknowledgment from the County Assessor
- 30–90 day informal contact where written evidence supports settlement
- 3–6 month hearing in front of the Grant County PTABOA if no settlement
- 30-day post-decision window to escalate to the Indiana Board of Tax Review
The Long-Term Picture
Grant County, like much of east-central Indiana, has been navigating a post-industrial reset for a generation. The 2026 cost-table update applies the same statewide multipliers regardless of local market context — which means the gap between assessed value and realistic market value can widen for older industrial and commercial parcels each cycle. For owners, the discipline is to use Form 11 as the annual checkpoint rather than waiting for a multi-cycle drift to compound.
For investors looking at Grant County rental property, the post-industrial price level paired with the SB 1 fixed homestead credit produces some of the highest rental yields in central Indiana — but the underwriting needs district-level rate detail rather than county averages.
Find Your Grant County Property
- Grant County overview
- Grant residential parcel data
- Grant commercial parcel data
- Grant industrial parcel data
- Grant agricultural parcel data