Michigan Property Tax Calculator

The tax bill on a listing sheet is almost never what you’ll pay once you own the home. Michigan caps how much a property’s taxable value can grow each year, but that cap resets (or “uncaps”) the year after a sale. On a home that’s been owned a long time, the reset can add hundreds of dollars a month. This calculator shows both numbers: what the current bill looks like, and what yours will likely become, so you can plan before your first full tax season.

Why Your Property Tax Bill Changes After You Buy

Michigan tracks two numbers on every parcel. State Equalized Value (SEV) is meant to sit at about 50% of true market value, and the assessor resets it each year based on local sales. Taxable Value (TV) is the number your tax bill actually uses. Under Proposal A (1994), TV can only grow by the lesser of 5% or inflation each year, even if the home’s market value jumps. That cap is what keeps long-time owners from getting taxed out of a house that has appreciated a lot.

The cap does not transfer with the deed. The year after a sale, Taxable Value uncaps and resets to that year’s SEV. Often that is a lot higher than the capped TV the seller had been paying on. The reset is normal. It is also easy to miss if you only look at the current owner’s tax bill on the listing sheet.

How this calculator works

1. Purchase price: what you’re paying for the home.
2. Current SEV: the assessor’s current State Equalized Value from the property tax record. This anchors your uncapped taxable value.
3. Current taxable value: the seller’s existing capped TV. We use it only to show what the bill looks like before the uncap.
4. Homestead status: whether you’ll file a Principal Residence Exemption (PRE) affidavit because you live in the home. That exemption removes the local school operating millage.
5. County, city/township, and school district: pick these and the calculator pulls the official homestead and non-homestead millage for that jurisdiction from the Michigan Department of Treasury’s 2025 Total Property Tax Rates report. If your address isn’t listed, or you want a quick check, enter your own rate in the total millage rate field or use the quick-fill chips. When you do that, the tool falls back to a flat 18-mill homestead exemption instead of the exact official split.

Your ongoing annual tax uses the uncapped taxable value (the lesser of the entered SEV or half the purchase price) times the effective millage. The first-year reference uses the current owner’s taxable value, since your first bill may still reflect the pre-uncap amount depending on when the uncap hits relative to closing.

Worked Example

Take a $275,000 home with a current SEV of $135,000 and a seller’s taxable value of $95,000, in a jurisdiction with 42.5 total mills, bought as a primary residence:

That is about $82 more per month in escrow than the listing sheet suggests. This calculator exists to surface that gap before it shows up as an escrow shortage.

Homestead vs. Non-Homestead: The PRE Exemption

If the home will be your primary residence, file a Principal Residence Exemption (PRE) affidavit with the local assessor. That exempts you from the school district’s local school operating millage, often around 18 mills (the exact figure varies by district). Investment properties, second homes, and rentals do not qualify, so a non-homestead buyer pays a higher effective rate on the same taxable value. Most Michigan closings handle the affidavit at closing, but confirm with your closing agent or the assessor that it was filed correctly and on time. A late or missed filing can leave you on the higher non-homestead rate longer than you need to be.

Timing at Closing: Why the Proration Calculator Matters Too

This tool estimates your ongoing annual tax. It does not replace the closing agent’s math that splits the current tax bill between buyer and seller on the settlement statement. That split depends on your closing date and local summer/winter due dates. Use the Property Tax Proration Calculator for the closing-day number, and this one for the annual budget figure you’ll plan around afterward.