Nobody files this form for you. Not the title company, not the seller's agent, not the county. Michigan's Principal Residence Exemption (Form 2368) removes 18 mills of school operating tax from your bill — but only if you submit it yourself within 90 days of closing. Miss the window, and you're billed at full non-homestead millage for the entire tax year.
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Talk to a Specialist →Here's what that gap actually costs on a real Metro Detroit 55+ purchase — Bridgewater, Brownstown Township, a $430,000 home at 27.67 mills:
That's roughly a $3,870 difference — for the one year you miss it — on a single, unremarkable piece of paperwork. It's not a penalty for anything you did wrong; it's simply what happens by default until you actively tell the township you live there.
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Michigan's Proposal A "uncapping" rule means your home's taxable value resets to roughly 50% of your purchase price the moment you close — regardless of what the previous owner was paying. A long-term seller's current tax bill tells you nothing useful about what you'll owe. Budget off your own purchase price and the local millage rate, not the number printed on the listing.
Combine the two mechanics and the lesson is the same: nothing about your Michigan property tax bill is automatic or inherited from the seller. Both the exemption and the reset are triggered by your own purchase, and only one of them requires you to take action to get the better outcome.
None of this is a reason to skip Metro Detroit — the pension exemption reform, the family and healthcare proximity, and the genuinely accessible entry prices at communities like Heritage in the Hills are all real advantages. It just means the paperwork here has a hard deadline attached to real money, in a way most other markets in this guide don't. Mark the 90-day window on a calendar the day you close, not the day you remember to look it up.
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