Johnson County is the south-Indy commuter county that residential growth has been quietly reshaping for a decade — Greenwood, Franklin, Bargersville, Whiteland, and the unincorporated subdivisions between them have absorbed tens of thousands of new homeowners, and every one of them is on the hook for the 2026 Form 11 cycle now reaching mailboxes. For 2026, Johnson County notices show another round of assessed-value growth on top of the 2025 statewide DLGF cost-table reset, and the appeal window closes June 15, 2026 (or 45 days from the notice date, whichever is later).
Recent local reporting has flagged assessed value as the dominant driver of rising Johnson County tax bills — even where rates held steady, AV growth pushed bills materially higher. That dynamic is now baked into the 2026 cycle, and the practical question for homeowners is whether the AV on the Form 11 is defensible against actual sales in the same neighborhood.
Johnson County 2026 quick facts. Form 11 notices mailed in late April. Spring tax due May 11, 2026; fall installment due November 10, 2026. Appeal deadline: June 15, 2026, or 45 days after the Form 11 mailing date — whichever is later.
What's Different About Johnson County in 2026
Three local factors shape how the 2026 reassessment lands on Johnson County owners.
1. South-Indy Sale Pressure on Comparables
Johnson County's residential comparables draw heavily from the Greenwood and Center Grove submarkets, both of which logged active sales through 2024 and into 2025. The DLGF's trending methodology uses a 14-month sales window to set January 1 values, which means the 2026 Form 11 reflects sale activity that ran through early 2025. Owners whose neighborhoods saw heavy turnover in that window will see the largest AV jumps; owners in low-turnover pockets may see comparatively modest movement.
2. Bargersville and Whiteland Annexation Drift
Continuing annexations in Bargersville and Whiteland have pulled formerly-unincorporated parcels into different taxing districts year-over-year. The line items on a Form 11 — county, township, town, school, library, special districts — can shift by district even when AV is unchanged. Verify your taxing district code on the Form 11 against the prior year; a quiet district reassignment can produce a 10–20% bill swing independent of AV.
3. Center Grove and Clark-Pleasant School Referenda
Two of Johnson County's school corporations carry referendum levies that materially affect the local rate stack. School-side rate changes can swing the total tax bill more than AV changes do — particularly for higher-AV homes that are not bound by the 1% homestead cap. When you read your Form 11 estimated tax projection, separate the AV component from the rate component before deciding whether the change warrants an appeal.
What to Check on the Form 11
The five-item statewide Form 11 checklist applies. Johnson-specific items to verify:
Homestead Status
If you bought in 2025, your 2026 Form 11 will only show a homestead deduction (and the new 10% / $300 SB 1 homestead credit) if your Form HC-10 was filed and processed. Closings late in 2025 frequently miss the cutoff — call the Johnson County Auditor's office to confirm before the spring tax deadline.
Property Class Code
Greenwood and Franklin both have material rental-conversion activity. A rental-coded parcel that converted to homestead during 2025 needs both the homestead filing and a class-code correction; otherwise the 2026 bill will hit at the 2% cap instead of 1%.
New-Construction Trueing
Johnson County has substantial new-construction inventory in Bargersville, Whiteland, and the south Greenwood corridor. Builder spec values and final assessed values frequently disagree — especially for homes that finished construction late in 2024 or during 2025. Compare the AV breakdown (land vs. improvement) on the 2026 notice against the contract sale price.
Acreage and Land Code
Subdivision lots near the urban edge sometimes carry a land code that hasn't caught up with the surrounding density. A 0.5-acre lot still coded as agricultural fringe will look mispriced when neighboring lots show standard residential land codes.
Johnson County By the Numbers
| Metric | Johnson County |
|---|---|
| County seat | Franklin |
| Largest city | Greenwood |
| Approximate population | ~165,000 |
| Townships | 9 |
| Property tax due dates | May 11, 2026 / Nov 10, 2026 |
| Form 11 appeal window | Through June 15, 2026 |
| 2026 spring credit | SB 1 homestead credit (up to $300) |
Filing an Appeal in Johnson County
Form 130 petitions are filed with the Johnson County Assessor's office in Franklin. Practical filing notes:
- One Form 130 per parcel. Bundling parcels onto a single petition is a common rejection cause.
- State your grounds. Market value is the most common ground; "assessment is too high" without a stated basis is weaker than a comparable-sales narrative.
- Provide evidence at filing. Comparable sales (3–5 closed sales from the trending window in your neighborhood code) carry the most weight at the PTABOA stage.
- Request a hearing date in writing. Johnson County issues a written acknowledgment within 30 days; if you haven't heard back, follow up before day 45.
- Pay the disputed bill anyway. Indiana requires that you pay the prior year's tax × current rate while a petition is pending — the disputed delta is held until resolution.
For an end-to-end walkthrough of the petition process (including escalation to the Indiana Board of Tax Review if PTABOA rules against you), see the Indiana property tax appeal guide.
Spring 2026 Tax Bill Anatomy
Johnson County tax bills now carry the SB 1 homestead credit as a new line item — a 10% credit on the post-cap bill, capped at $300 per homestead. For most Johnson County homesteads, this credit lands at or near the cap, especially on the northern (Greenwood) end of the county where AVs are higher.
A representative Greenwood homestead with a $250,000 AV at the 1% cap should see:
- Pre-credit capped bill: ~$2,500
- 10% homestead credit: $250
- Net spring + fall bill: ~$2,250 split across two installments
Higher-AV homes (Center Grove, Bargersville's newer subdivisions) will more often reach the $300 cap on the credit. The credit does not reduce the cap calculation itself — it applies after the cap.
When an Appeal Pays Off
A Johnson County appeal is most likely to deliver meaningful savings when:
- The AV growth is concentrated in the improvement value rather than land — improvement-value appeals are easier to evidence with photos and condition documentation.
- Comparable sales in the neighborhood code support a lower value — the strongest evidence is sales in the same neighborhood code, not just the same ZIP.
- The home is not cap-bound — for cap-bound homes, the 1% / 2% / 3% caps limit bill-side savings even on a successful AV reduction.
- Square footage, bedroom count, or class code is wrong — clerical errors are the easiest informal fixes and don't require a hearing.
Property Lookup shows your Johnson County AV alongside neighborhood comparables; Tax Appeal builds the Form 130 evidence package on contingency if you'd rather not run the process yourself.
Find Your Johnson County Property
- Johnson County overview
- Johnson residential parcel data
- Johnson commercial parcel data
- Johnson agricultural parcel data