What will property taxes be on your Zionsville home?
The tax bill on a listing is the seller’s, not yours. This estimator works out your bill the way the county will: the certified 2026 district rate, homestead deductions, the 1% cap, and the school referendum. Then it checks the result against what Zionsville homes actually paid.
Your numbers
Your estimated bill
| Assessed value (your price) | $600,000 |
| Homestead deduction | −$48,000 |
| Supplemental deduction (40% of the rest) | −$220,800 |
| Taxable value | $331,200 |
| Tax at the district rate ($1.6903/$100) | $5,598 |
| 1% cap check (not reached) | — |
| 2025-reform homestead credit | −$300 |
| School referendum, outside the cap ($0.3433/$100) | +$1,137 |
| Estimated annual bill | $6,435 |
Why your bill won’t match the seller’s
Indiana bills a year behind the assessment, and deductions belong to the owner, not the house. A longtime owner’s bill reflects their homestead deductions; those don’t become yours when you buy. Your first year runs on the seller’s status; your own deductions take effect the cycle after you file. So the figure on a listing, or the county site, can differ sharply from what you’ll pay.
The 1–2–3 caps, and what escapes them
Indiana caps the tax on an owner-occupied home at 1% of gross assessed value; other residential property (a rental, a second home) and farmland at 2%; business and other property at 3%. One thing rides on top of the cap: voter-approved referendum levies. Zionsville schools carry $0.3433 per $100 in referendum rates. The operating piece runs through the 2027 bills; its renewal is on the November 2026 ballot.
What the 2025 reform changes
The 2025 property-tax law (SEA 1) added a homestead credit (10% of the bill, up to $300, automatic) and rebuilds the deductions each year through 2031: the flat deduction shrinks while the percentage deduction grows. Rentals gain a small automatic deduction on the same schedule.
| Bills paid in | Flat deduction | % deduction |
|---|---|---|
| 2026 | $48,000 | 40% |
| 2027 | $40,000 | 46% |
| 2028 | $30,000 | 52% |
| 2029 | $20,000 | 57% |
| 2030 | $10,000 | 62% |
| 2031+ | $0 | 66.7% |
Claiming your homestead deduction
For most buyers it happens at closing: the sales disclosure form, filed with the homestead box checked, doubles as the application. The legal cutoff is January 15 of the year your first bill comes due. If that didn’t happen, file form HC10 with the Boone County Auditor (765‑482‑2940) by that same January 15, and verify it posted before your first bill. It doesn’t renew annually, but re-file if you move the home into your trust. Entity-owned homes (LLC or other business) generally aren’t eligible at all. Claiming a homestead you don’t live in carries a 10% penalty.
The 2026 rates, district by district
Every Zionsville-schools address falls in one of six Boone County taxing districts. Three share the town rate; the rural townships run lower; the Whitestown-side district (Anson area: Zionsville schools, Whitestown services) runs higher.
| District | Code | Rate per $100 |
|---|---|---|
| Zionsville town – Eagle Township | 06006 | $2.0336 |
| Zionsville town – Eagle urban service | 06029 | $2.0336 |
| Zionsville town – Union urban | 06034 | $2.0336 |
| Rural Eagle Township | 06005 | $1.8531 |
| Rural Union Township | 06016 | $1.8531 |
| Whitestown – Eagle Township | 06021 | $2.8894 |
Across the county line, for the same bill year: Zionsville (town) $2.0336 · Carmel – Clay Township $2.0167 · Westfield – Washington Township $2.3448 per $100. The rate is only half the story; deductions and the caps do the rest, which is what the estimator above works out.
How this is built, and what it isn’t
The math follows the 2026 rules as Indiana’s Department of Local Government Finance states them: the certified Boone County budget order, the homestead deductions as amended by SEA 1-2025, the circuit-breaker caps, the cap-exempt school referendum, and the DLGF’s published worked example. The reality-check figures are actual bills paid in 2024, from county records, as a share of that year’s assessed value; they predate the 2025 reform, so the estimate runs a touch lower. It is still an estimate, not a bill: it assumes your price becomes the assessed value (assessments trend toward market but lag it), ignores benefits you may qualify for (the over-65 credit, veteran deductions), and can’t see this year’s appeals or next year’s levies. Before you close, confirm the numbers with the Boone County Auditor (765‑482‑2940).