Last September, the Hamilton County Auditor's office sent a letter to every taxing unit in the county with an uncomfortable admission: the math was wrong. Auditor Todd Clevenger's team had calculated the county's 2026 assessed values using a deduction formula that no longer existed. Indiana's new property tax law, Senate Enrolled Act 1, had replaced a tiered deduction that capped benefits for homes assessed above $600,000 with a flat rate that applies to every home the same way, regardless of price. The auditor's office used the old rate. The result was a countywide assessed value that ran higher than it should have, which meant every taxing unit in Hamilton County, including Carmel, was building 2026 budgets on a number that needed to be corrected before the state would sign off on it.
Clevenger owned the mistake publicly and scheduled a hearing to fix it. But the error is a useful accident, because it forced a public airing of exactly how the new formula works, and that formula is the thing worth understanding if you're weighing a home in Carmel against one somewhere else in Hamilton County or across the county line.
The formula changed shape, not just size
Before SEA 1, Indiana's supplemental homestead deduction treated a home's value in two tiers. A homeowner got 37.5 percent shielded from taxation on assessed value up to $600,000, but only 27.5 percent on anything above that threshold. A $900,000 assessment got a noticeably smaller break on its top third than a $500,000 assessment got on all of its value.
Starting with 2026 bills, that tier is gone. Every homestead now gets a flat 40 percent supplemental deduction on its entire assessed value, on top of the $48,000 standard deduction that applies before the percentage kicks in. There's no cliff at $600,000 anymore. The percentage climbs again in future years, reaching 46 percent in 2027 and eventually 66.7 percent by 2031, while the standard deduction shrinks from $48,000 toward zero over the same stretch.
That sounds like a straightforward win for homeowners, and for most people it is. But a flat percentage formula behaves differently depending on where your home sits on the value curve, and that's the part the headlines about relief tend to skip.
Why the relief tilts toward higher-value homes
A percentage-based deduction returns more absolute dollars the higher the number it's applied to. That's just arithmetic. But this reform does something more specific than that: it removes a penalty that used to apply only above $600,000. Homes that used to get capped at the lower 27.5 percent rate on their upper value are the ones who see the biggest structural change, and in Hamilton County, that group is concentrated in Carmel and Fishers rather than in the county's more modestly priced areas.
An Indiana Fiscal Policy Institute analysis of the reform put a number on where the crossover happens: the assessed value at which the old and new formulas produce the same tax bill is roughly $102,740. Below that point, the difference between formulas is negligible. Above it, the new formula pulls ahead, and it keeps pulling ahead as assessed value rises, all the way through the old $600,000 cliff and beyond. Since Carmel's median home value runs well north of that break-even point, most Carmel homeowners are on the winning side of this math by a wider margin than a homeowner in a lower-assessed part of the county.
This matters for a buyer comparing Carmel to a neighboring suburb, because it means the tax advantage of the new law isn't evenly spread across Hamilton County's price points. A home shopper weighing a $700,000 Carmel listing against a $350,000 home somewhere else in the county is looking at two properties that will benefit from this reform in noticeably different proportions, even before local tax rates and school levies enter the picture.
What Carmel's own budget documents show
The dollars have to come from somewhere, and Carmel's city government has been transparent about the tradeoff. During legislative testimony on an earlier draft of the bill, Mayor Sue Finkam told the Senate Tax and Finance Committee that Carmel had added roughly $4 billion in assessed value to the city in recent years while general fund property tax receipts had grown only about 7 percent over that same stretch, and that early consultant estimates on the proposal showed it could strip $2.7 billion in assessed value and $26.1 million from the city's general fund in its first year.
"We've helped build a beautiful city and added a whopping $4 billion in assessed value... while our general fund property tax receipts have only increased 7 percent," Finkam told lawmakers.
The version that ultimately passed differs in some particulars from what she was testifying against, but the underlying tension she raised is visible in Carmel's own 2026 budget presentation. That document models a hypothetical senior household with a $300,000 home and $40,000 in annual income, showing that household's property tax bill dropping by $702 in 2026 and growing to a savings of roughly $1,727 by 2030 as the law phases in. The same presentation shows the city's total property tax revenue on two different paths: one where it keeps climbing to about $122.2 million within several years under the old formula, and another, reflecting the new law, where it peaks around $94.8 million before declining to roughly $84.1 million over that same window.
Lower bills for homeowners and slower revenue growth for the city are two sides of the same reform. Whether that tradeoff matters to you depends on how much weight you put on the pace of future infrastructure and service investment in a city that has built its reputation partly on that kind of spending, from its network of roundabouts to its ongoing downtown development.
The ZIP code inside "Carmel" that changes your bill
Even within Carmel's city limits, the tax math isn't uniform. Homeowners in the 46290 ZIP code carry a median effective tax rate around 1.12 percent, while those in 46280 pay closer to 0.97 percent, a spread that traces back to differing school district boundaries and special assessment districts layered across the city. That 0.15 percentage point gap sounds small until you see it in dollar terms: median annual bills run around $2,766 in 46280 compared with roughly $6,160 in 46290. Two homes with similar market value, both inside Carmel, can carry meaningfully different annual tax obligations depending on which side of a district line they sit on.
The Carmel-versus-Fishers comparison just got more complicated
Property tax isn't the only piece of the local tax picture in motion this year. SEA 1 also rewrites how Hamilton County's local income tax gets distributed and ends the long-standing practice of pooling county income tax revenue and redistributing it by formula. Cities with populations above 3,500, including Fishers, can now adopt their own municipal income tax of up to 1.2 percent, with the combined county-plus-city rate capped at 2.9 percent, down from the previous statewide maximum of 3.75 percent. A separate adjustment to the county's distribution formula sent Fishers roughly $8 million more in 2026 revenue and Carmel about $1.5 million more, following a dispute over the old formula that Carmel had challenged in court.
None of this changes what a buyer pays at closing, but it means the total tax relationship between Carmel and Fishers, or between either city and Westfield, isn't a fixed comparison you can look up once and trust for years. Both the property tax formula and the income tax structure underneath these cities are being rebuilt in the same legislative session, and they'll keep shifting through 2031.
Three things worth checking before you compare Carmel to anywhere else
- Pull your target property's actual assessed value, not just its market price, and see where it falls relative to the roughly $102,740 break-even point and the old $600,000 threshold. The gap between those two numbers is where the reform's benefit concentrates.
- Confirm the ZIP code matters. A home search that treats all of Carmel as one tax environment will miss a real spread in effective rates between areas like 46280 and 46290.
- Check your bill for the new automatic $300 supplemental homestead credit. If your homestead standard deduction was already on file, this should appear under "Credits" without any application, but it's worth verifying rather than assuming.
A few questions worth asking directly
Do I need to apply for the new credit or the higher deduction percentage? No. If your property already carries the Homestead Standard Deduction, both the 40 percent supplemental deduction and the new $300 credit apply automatically starting with 2026 bills. Confirm they appear as line items rather than taking it on faith.
Does this mean property taxes are dropping everywhere in Hamilton County? Most homesteads see some reduction, but the size of that reduction scales with assessed value under the new flat percentage formula, and it doesn't touch the local tax rate itself, which varies by school district and taxing unit within Carmel.
Will Carmel need to raise rates to make up for the lost revenue? City officials have said current budgeted services aren't being cut for 2026, but Carmel's own projections show slower revenue growth over the next several years under the new formula. That's a fair question to raise with any city official or school board representative if long-term service levels factor into your decision.
Numbers like these are exactly why a home search in Carmel benefits from someone who tracks the fine print behind the market, not just the listings on top of it. If you're weighing Carmel against another Hamilton County suburb and want the tax picture laid out alongside the neighborhoods and school zones that fit your family, the Stacy Barry Team can walk through the specifics with you. Schedule a Free Home Consultation and bring your questions about assessed values, ZIP code boundaries, or anything else on this list.
