That Commerce Township listing shows $3,200 in annual commerce township michigan property taxes. The seller has owned the place for 14 years. Everything looks affordable. But the day you close, Michigan's Proposal A uncapping resets your taxable value to the home's current state equalized value, and your tax bill jumps to roughly $5,400. That's a $183-per-month budget error you didn't plan for.
Michigan is one of few states where the current owner's tax bill is functionally useless for predicting what a buyer in Commerce Township will actually pay. The uncapping mechanism, the difference between Huron Valley and Walled Lake school district millage rates, and Oakland County's Headlee rollback all affect your real number. I'm going to walk through the exact math, because most online guides about this topic stop at "taxes go up when you buy." That's not enough.
Key Takeaways
- Michigan uncaps taxable value at sale, often raising annual taxes 40-69% for Commerce Township buyers
- Huron Valley school district millage runs roughly 7.5 mills higher than Walled Lake's, per Oakland County records (Oakland County Treasurer, 2026)
- Headlee rollbacks can reduce your actual rate below the voted millage, but the savings vary by taxing jurisdiction
- Always calculate taxes from SEV, not the seller's current bill
How does Michigan's Proposal A uncapping work on commerce township michigan property taxes?
Michigan's Proposal A, passed in 1994, caps annual taxable value increases at the lesser of 5% or the rate of inflation (Michigan Legislature, MCL 211.27a, 1994). When a property sells, that cap vanishes, and taxable value resets to 50% of true cash value (the state equalized value, or SEV). For long-held Commerce Township homes, the gap between capped taxable value and current SEV can be enormous.
Here's a concrete example. A home on Oakley Park Road purchased in 2010 for $180,000 might carry a current taxable value of around $105,000, kept low by 14 years of inflation caps. But if the home's market value has climbed to roughly $340,000 (consistent with Commerce Township's median sale price of $347,450 as tracked in recent Oakland County sales data from Realtor.com, 2026), its SEV sits at $170,000.
That means the taxable value jumps from $105,000 to $170,000 at closing. A 62% increase.
The longer a seller has owned the home, the bigger the gap. I've seen properties near Union Lake where the taxable value was less than half the SEV because the prior owner bought in the early 2000s. A buyer looking at the MLS tax line and thinking "I can afford that" is budgeting off someone else's grandfathered rate.
What's the actual millage rate, and why does your school district matter?
Commerce Township's total millage depends heavily on which school district the home falls in. Oakland County levies a base rate, but the real variation comes from school operating and debt millages. In 2026, Commerce Township properties in the Huron Valley School District pay a total millage of approximately 41.8 mills, while properties in the Walled Lake Consolidated School District pay roughly 34.3 mills (Oakland County Equalization Division, 2026).
That 7.5-mill spread is significant. On a taxable value of $170,000, the Huron Valley side pays about $7,106 in annual taxes. The Walled Lake side pays about $5,831. Same township. Same purchase price. A $1,275 annual difference, purely because of which side of the school district boundary the house sits on.
Photo by Sonny Sixteen on Pexels
Most competitor pages I've read treat Commerce Township as a single millage rate. It isn't. A home on Sleeth Road (Huron Valley) and a home on Wise Road (Walled Lake), both priced at $340,000, will generate tax bills that differ by over $100 per month.
How to find your school district before making an offer
Check the Oakland County property search tool at accessoakland.oakgov.com. Enter the parcel ID or address. The result page lists the school district code. Huron Valley is code 63190. Walled Lake is 63300. Do this before you write the offer, not after.
The $3,200-to-$5,400 uncapping example, step by step
Let me build the full calculation so you can replicate it for any Commerce Township home you're considering.
Seller's current situation:
- Home purchased in 2012 for $195,000
- Current taxable value (after years of capped increases): $112,000
- School district: Walled Lake (total millage ~34.3 mills)
- Annual tax bill: $112,000 × 0.0343 = $3,842 (but with Headlee rollbacks reducing effective rate, actual bill is closer to $3,200)
Your situation as the new buyer:
- Purchase price: $340,000
- New taxable value (SEV = 50% of true cash value): $170,000
- Same Walled Lake millage: ~34.3 mills
- New annual tax bill: $170,000 × 0.0343 = $5,831
But wait. Headlee rollbacks apply to you too, just at the current rolled-back rates. The effective total millage might be closer to 32.1 mills after rollbacks, giving you a bill of about $5,457.
In 30 years of selling homes across Commerce Township and surrounding areas, I've watched buyers get blindsided by this math dozens of times. The tax line on the MLS listing is the seller's number, and it's been suppressed by a decade or more of Proposal A caps. Your number will be higher. Sometimes dramatically higher.
"I always run the uncapping calculation before my buyers even tour a Commerce Township home, because the sticker shock at closing is worse than the sticker shock on the listing price," says Robert Harrell.
What is the Headlee rollback, and does it actually save you money?
The Headlee Amendment (1978) requires local taxing jurisdictions to roll back millage rates when total taxable value in the jurisdiction grows faster than inflation (Michigan Constitution, Article IX, Section 31, 1978). This means the voted millage rate and the actual levied rate are often different.
For example, Commerce Township's general operating millage was voted at a specific rate, but the Headlee rollback has reduced the effective levy. Oakland County's equalization reports show rollback fractions that shave anywhere from 0.5 to 2.0 mills off individual levies across Commerce Township's various taxing authorities.
Photo by Leeloo The First on Pexels
Why Headlee rollbacks don't erase the uncapping pain
Rollbacks help everyone in the jurisdiction proportionally. If you're a long-time owner whose taxable value has been capped at $105,000, the rollback saves you maybe $150 a year. If you're a new buyer at $170,000 taxable value, the rollback saves you maybe $240. The proportional savings are identical. The absolute dollar difference in your tax bill, compared to the prior owner, barely changes.
I've seen buyer agents in Oakland County tell clients "don't worry, Headlee rollbacks will offset the uncapping." They won't. The rollback applies to the millage rate, which everyone benefits from equally. The uncapping is a taxable-value jump specific to you. These are two separate mechanisms, and conflating them is a budgeting mistake.
How does the 15-acre retail development affect future Commerce Township taxes?
Commerce Township's proposed 15-acre retail development near M-5 and Haggerty, along with the park expansion announced in mid-2026 (WXYZ 7 News Detroit, 2026), could shift the township's tax base. New commercial development generates property tax revenue without adding school-age children, which can reduce the per-household burden for operating millages over time.
But "over time" matters. Construction takes years. The immediate effect on your 2027 tax bill is zero. What does matter right now: if Commerce Township's total taxable value grows faster than inflation because of new development, Headlee will roll back millage rates slightly for everyone. That's a marginal benefit, not a reason to ignore your uncapping math.
How should you budget for property taxes when buying a home in Michigan?
Skip the MLS tax line entirely. Start with the listing's SEV, which Oakland County publishes for every parcel. Multiply SEV by the total millage rate for that parcel's specific school district and taxing jurisdictions. The Oakland County Treasurer's website publishes millage rates annually.
Here's the formula:
Your estimated annual tax = SEV × (total millage ÷ 1,000)
For a $340,000 Commerce Township home in the Walled Lake district:
- SEV: $170,000
- Effective millage (after Headlee): ~32.1 mills
- Annual tax: $170,000 × 0.0321 = $5,457
For the same home in the Huron Valley district:
- Effective millage (after Headlee): ~39.5 mills
- Annual tax: $170,000 × 0.0395 = $6,715
That's a $1,258 annual gap. Your lender's escrow department will calculate this for you eventually, but "eventually" is after you've made an offer. Know your number before you bid. A buying agent who works Commerce Township daily should be running this for you at the showing stage, not the closing table.
Frequently asked questions
Does Michigan uncap property taxes every time a home sells?
Yes. Under MCL 211.27a, taxable value uncaps to the state equalized value (50% of true cash value) upon transfer of ownership. In Commerce Township, where many homes have been owned 10+ years, this routinely increases annual taxes by 40-69%.
Can I appeal my property tax assessment in Oakland County?
You can. Oakland County's Board of Review hears appeals each March. You'll need comparable sales data showing the assessed value exceeds market value. In 2025, Oakland County processed over 4,800 residential assessment appeals (Oakland County Equalization, 2025). Success rates are higher when you bring a recent appraisal.
Why does my Commerce Township neighbor pay so much less in property taxes?
Proposal A's taxable value cap means long-time owners' assessments grow slowly (capped at 5% or inflation, whichever is less). Your neighbor who bought in 2005 for $220,000 might have a taxable value of $120,000 while your identical home, purchased in 2026 for $340,000, has a taxable value of $170,000. Same house, same street, $50,000 taxable value gap.
Are there any property tax exemptions for Commerce Township homeowners?
Michigan's Principal Residence Exemption (PRE) eliminates the 18-mill school operating tax for your primary home. If you're buying a Commerce Township home as your primary residence, you automatically qualify. If you're buying it as a rental or second home, expect your tax bill to be roughly $3,060 higher annually on a $170,000 taxable value. File Form 2368 with the Michigan Department of Treasury within 90 days of closing.
Your next step before making an offer
Pull up the Oakland County parcel viewer. Find the SEV for any Commerce Township home you're considering. Multiply by the correct total millage for that parcel's school district. Compare that number to the MLS tax line. If there's a gap of $1,500 or more, you now understand why, and you can budget accurately instead of getting a surprise escrow adjustment six months after closing.
Commerce Township property taxes aren't a mystery. They're just a system that punishes buyers who don't run the math before they make an offer. Run the math. If you need help verifying millage rates or finding homes in Commerce Township where the uncapping gap is smaller, that's the kind of thing 30 years of local knowledge is built for.
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