If you're buying a home in Michigan, don't assume the property tax number on the listing — or the seller's most recent bill — is close to what you'll actually owe. There's a specific, well-documented mechanism that can raise a buyer's tax bill noticeably compared to what the previous owner paid, and it catches a lot of people off guard.

Assessed value, taxable value, and the gap between them

Michigan has two separate numbers for every property:

Under Proposal A, passed in 1994, taxable value can only increase each year by the rate of inflation or 5%, whichever is lower — regardless of how much the SEV (and the real market) has risen. Over years of ownership, especially in a rising market, taxable value can fall well behind SEV.

The "uncapping" that happens after a sale

That cap only protects an existing owner. When a property sells, its taxable value uncaps the following year and resets to match that year's SEV. If the previous owner had been in the home for 10-15 years in an appreciating market, their taxable value might be sitting well below current SEV — and the buyer's first full tax year will reflect the full, uncapped number.

Concretely: a home with a current SEV of $150,000 (implying roughly $300,000 market value) might have a taxable value of only $95,000 if the seller bought it 15 years ago. The buyer's tax bill the year after closing gets calculated on the full $150,000 — a jump of over 50% compared to what the seller was paying, even though nothing about the home itself changed.

The Principal Residence Exemption (PRE)

The other major factor: whether the home is your primary residence. Michigan's Principal Residence Exemption excuses an owner-occupied primary home from the local school operating millage — typically around 18 mills (that's $18 per $1,000 of taxable value). Second homes, rental property, and vacation homes don't qualify, and pay the full local millage instead.

To claim it, you (or often the closing company on your behalf) file a Principal Residence Exemption Affidavit (Form 2368) with your local township or city assessor — by June 1st for that summer's bill, or November 1st for the winter bill. Don't assume it's automatic; confirm it was filed.

How to estimate your real bill before you buy

Ask your agent or the listing for the property's current SEV, not just the seller's tax bill. As a rough estimate, a buyer's first full-year tax bill (for a primary residence) often lands somewhere around the SEV × the local homestead millage rate ÷ 1,000 — though local millage varies meaningfully by township, city, and school district, so this is a starting point, not a quote.

Frequently asked questions

Why did my Michigan tax bill jump after I bought my house?

Because taxable value uncaps in the year following a sale, resetting to roughly the state equalized value (SEV) — which is often meaningfully higher than the capped taxable value the previous owner had been paying on, sometimes for many years.

What is the Principal Residence Exemption?

An exemption that excuses an owner-occupied primary residence from the local school operating millage, typically around 18 mills. Second homes, rentals, and other non-homestead property don't qualify.

How do I file for the Principal Residence Exemption?

By filing a Principal Residence Exemption Affidavit (Form 2368) with your local township or city assessor, typically by June 1st for that summer's tax bill, or November 1st for that winter's bill. Many closings arrange for this to be filed as part of the transaction, but it's worth confirming directly rather than assuming.