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Resource Center: deep-dive tax education for Southeast Michigan buyers, part of the Resource Center municipal library.

Municipal Resources · Property Taxes

Taxable Value Uncapping:
Why the Seller's Taxes Are Not Yours

Proposal A protects long-time owners with a tax cap, but that cap resets when you buy.

By Derica Wade, Associate Broker · Hearts to Homes Team · July 2026

Uncapping is the number-one property tax surprise for Michigan buyers. The tax bill on Zillow almost never reflects what you will pay.

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Michigan Tax Law

How Proposal A Created the Cap

Michigan's Proposal A (1994) limits annual increases in taxable value to 5% or the rate of inflation, whichever is lower. Long-time owners benefit from a taxable value that often sits well below current market value.

That cap is a gift to existing homeowners, and a trap for buyers who assume the seller's bill is representative.

At Sale

What Happens at Uncapping

When property ownership transfers, the cap is removed. In the tax year following your purchase, taxable value resets to the State Equalized Value (SEV): typically about half of assessed market value.

Example

Seller owned 20 years. Taxable value: $95,000. SEV today: $175,000. You buy at $350,000.

Your first full-year taxable value ≈ $175,000, not $95,000.

Listing sites still show the seller's $3,800 bill. Your reality may be closer to $7,500.

Practical Math

How to Estimate Your Post-Sale Taxes

  1. Divide your expected purchase price by 2 → approximate new taxable value (SEV)
  2. Look up total millage rate for that specific address (county + city/township + schools)
  3. Multiply: taxable value × mills ÷ 1,000
  4. Apply PRE reduction if you will owner-occupy: see our PRE guide

Compare jurisdictions in our City vs Township Taxes guide.

Common Questions

Frequently Asked Questions

What does taxable value uncapping mean?+

When a Michigan property sells, the Proposal A cap is removed and taxable value resets to SEV in the following tax year.

Why are Zillow tax figures wrong for buyers?+

Listing sites show the current owner's capped bill, not the uncapped bill a new buyer will pay.

How do I estimate taxes before I offer?+

Use purchase price ÷ 2 as taxable value, multiply by total mills ÷ 1,000, then adjust for PRE if applicable.

Still Have Questions?

Questions About This Topic?

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