Say two buyers each put an offer on a $600,000 home in Northville this fall. Same school district, same closing timeline, same lender. One buyer's first full-year tax bill lands around $11,991. The other's lands around $10,652. Neither made a mistake. Neither got a bad deal. The difference has nothing to do with the house and everything to do with which side of an invisible line it sits on.
That line runs between the City of Northville and Northville Township. Both send kids to Northville Public Schools. Both show up on a map as "Northville." But the City's total homestead millage for Northville Schools is 39.9709 mills, while the Township's is 35.5072, according to the Michigan Department of Treasury's 2025 Total Rates Report. Multiply either rate against a taxable value of roughly $300,000, which is what a $600,000 sale settles into the year after closing, and you get two different bills on two otherwise identical homes.
That gap is the thing worth understanding before you write an offer, not after you get your first bill.
The math nobody runs before making an offer
Michigan taxes real property based on taxable value, not sale price. Under Proposal A, taxable value grows slowly while you own a home, capped at whichever is lower: 5 percent or the state's inflation multiplier, set at 2.7 percent for 2026. That cap is why a longtime owner's tax bill can look nothing like what a buyer will actually pay. It also means the seller's current bill tells you almost nothing about your future one.
Here's the comparison using the official rates:
| Jurisdiction | Homestead millage (Northville Schools) | Est. tax on $600,000 sale (year after transfer) |
|---|---|---|
| City of Northville | 39.9709 mills | ~$11,991 |
| Northville Township | 35.5072 mills | ~$10,652 |
That's roughly $1,339 a year, or about $112 a month, driven entirely by municipal boundary rather than square footage, lot size, or condition. The estimate assumes a straightforward uncapping to 50 percent of market value with no special assessments layered on top, which is the baseline every buyer should run before anchoring on a number from a listing sheet.
The variation doesn't stop at the city line. Even within the same ZIP code footprint, effective rates differ by a few hundredths of a percentage point depending on which assessment district a parcel falls into, according to property tax data from Ownwell. None of these differences are large enough to change whether Northville is the right move. They're large enough to change what you budget for the first year.
What actually happens the year after you buy
The mechanism behind all of this is uncapping, and it's worth understanding in plain terms because it catches more buyers off guard than any single millage rate does.
While an owner holds a home, Proposal A limits how fast the taxable value can rise. It doesn't matter if the neighborhood appreciated 15 percent in a year. The owner's number moves at inflation or 5 percent, whichever is lower. That protection ends the moment ownership transfers. The Michigan Department of Treasury is direct about this: a transfer of ownership causes the taxable value to uncap in the calendar year following the transfer, resetting to the State Equalized Value, which is set at 50 percent of the property's market value.
In practice, that means the tax bill printed on the listing sheet, the one belonging to a seller who has owned the home for a decade or two, is a snapshot of a number that no longer applies once you sign. Your first full year's bill will reflect the new taxable value, not the old one. Buyers who budget off the seller's Zillow-style tax history often find their actual bill running well above what they planned for, purely because they priced the transaction using someone else's capped number.
The fix isn't complicated. Before you write an offer, ask what the current State Equalized Value is on the parcel, not just the current taxable value, since SEV is the number your bill will reset to. Your agent or the local assessor's office can pull it directly.
The vote you might have seen this summer
If you've been watching local news while house hunting, you may have seen a headline about Northville Public Schools and a tax vote. On August 4, 2026, voters in the district, which spans Wayne, Oakland, and Washtenaw counties, approved an 18-mill operating millage replacement by wide margins: 69 percent in Wayne County and 65 percent in Oakland County, according to Northville-Novi News. The measure secures roughly $11.8 million a year for the district through 2036.
Here's the part that matters if you're buying a primary residence: this vote does not touch your bill. The 18 mills at stake apply only to non-homestead property, meaning rentals, second homes, commercial parcels, and vacant land. A primary residence with a Principal Residence Exemption in place never paid that levy to begin with, and the vote didn't add a new tax. It replaced an expiring one at the same rate. Northville Public Schools states plainly in its own election materials that there is no additional cost to homeowners occupying their primary residence.
That distinction is easy to miss if you're scanning headlines rather than the ballot language itself, and it's the kind of detail that separates a confident buyer from one who walks into closing bracing for a bill that was never coming.
A few boundaries worth checking before you write an offer
- Confirm whether the property sits in the City of Northville or Northville Township. The address won't tell you. The parcel record will.
- Ask for the current SEV, not just the current taxable value, since SEV is what your bill resets to the year after you buy.
- File your Principal Residence Exemption promptly after closing. The deadlines are June 1 for the summer levy and November 1 for the winter levy, and missing both means petitioning the Board of Review to recover the exemption retroactively.
- If your purchase closes near a tax deadline, verify with the treasurer's office how the prorated bill will be handled. Northville Township lists summer taxes as payable without interest until mid-September and winter taxes into mid-February, with penalties accruing after that.
None of these steps require a real estate license to complete. They require knowing which questions to ask before the number on the closing statement becomes the number on your mortgage escrow.
A short FAQ
Does the August 2026 millage vote raise my property taxes if I plan to live in the home? No. The renewed 18 mills applies only to non-homestead property. An owner-occupied home with a Principal Residence Exemption in place is unaffected.
How do I find out if a Northville listing is in the City or the Township? The parcel record maintained by the local assessor's office will show the jurisdiction. Your agent can pull this before you write an offer rather than after you're under contract.
Why does my new tax bill not match what the seller was paying? Michigan resets taxable value to the State Equalized Value the year after a sale. The seller's capped, long-held number and your uncapped, first-year number are calculated differently by design.
Northville rewards buyers who ask about jurisdiction and uncapping before they fall in love with a kitchen. If you're comparing homes across the City and Township lines, or you want the exact millage pulled for a specific parcel before you make an offer, Anthony Maisano can walk through the numbers with you and schedule a strategy call before you're locked into a price.
