Michigan Property Tax Uncapping: SEV or Purchase Price?

After a qualifying Michigan home purchase in 2026, property tax uncapping generally resets taxable value to 2027 state equalized value (SEV). That figure is not automatically half the purchase price. The seller’s taxable value can substantially understate the buyer’s future tax base. Michigan State Tax Commission guidance

Why SEV differs from half the purchase price

The distinction starts with three values:

• True cash value is the property’s value determined for assessment purposes, generally its usual selling price under ordinary market conditions.
• Assessed value is generally 50% of true cash value. County and state equalization review establishes SEV.
• Taxable value is the base to which property-tax millage applies. Between qualifying transfers, its growth generally follows the lower of inflation or 5%, with adjustments for additions and losses, and it cannot exceed SEV. Ann Arbor’s assessment explanation

That cap can leave a longtime owner’s taxable value well below SEV. Check the gap when preparing your home purchase budget.

Michigan law does not generally presume that the price paid equals true cash value. MCL 211.27(6), reproduced in Treasury’s Property Transfer Affidavit instructions, requires assessors to use the same valuation method used for other property of the same classification in their jurisdiction. A sale can inform market evidence without dictating that parcel’s assessment.

A 2026 purchase uses 2027 SEV

For a qualifying transfer completed in 2026, uncapping occurs in 2027 using that year’s SEV. The 2026 SEV on the existing parcel record is a budgeting reference. The ordinary cap generally applies again to subsequent annual changes, subject to additions, losses and further qualifying transfers. Treasury’s transfer guidance

As of October 22, 2026, the final 2027 SEV and complete 2027 millage are still future inputs. Michigan’s calendar identifies December 31, 2026, as the valuation reference date, called Tax Day, for 2027 property taxes. A buyer budgeting now therefore needs assumptions that can be replaced as assessments and rates become available. 2026 property-tax calendar, issued October 14, 2025

Build a provisional tax estimate

Start with the assessor’s parcel record and available summer and winter bills to compare location-specific housing costs. Record the seller’s taxable value, current SEV, exemption percentage, municipality and school district. Ask the assessor whether the record reflects the home’s current improvements and whether preliminary information can help bracket next year’s SEV.

For the portion calculated on taxable value:

Estimated annual tax = assumed next-year SEV × applicable mills ÷ 1,000

One mill means $1 per $1,000 of taxable value. Keep separately billed assessments and charges outside this calculation unless they are already included in the rate or calculator result.

Treasury’s Property Tax Estimator asks for the county, municipality and school district, and directs prospective owners to enter SEV. As of October 22, 2026, it displays 2025 millage rates. Entering an assumed 2027 SEV combines a future valuation scenario with historical rates; the result is a provisional estimate.

Check the estimator’s inclusions before adding charges. It says it includes a 1% administration fee and specified assessments charged through millage, but excludes other special assessments. Treasury’s separate 2025 rate report excludes the administration fee and offers columns with different assessment inclusions. Ask the local treasurer about parcel-specific assessments, service charges and any newer rates.

Example: the seller’s tax base and the buyer’s estimate

This hypothetical purchase is not a Michigan rate quotation or valuation forecast. Assume a qualifying 2026 transfer, a full principal residence exemption (PRE) for the buyer, and no other property-tax exemption. Use 40 mills for both comparisons to isolate the valuation change. Exclude administration fees, special assessments and other charges.

The seller comparison is $90,000 × 40 ÷ 1,000 = $3,600 annually, or $300 a month before excluded charges.

The buyer’s assumed 2027 calculation is $157,500 × 40 ÷ 1,000 = $6,300 annually, or $525 a month. That is $225 more each month under these assumptions.

At the same rate, using the current $150,000 SEV would produce $6,000 annually. Using half the $350,000 purchase price would produce $7,000. Neither shortcut establishes the actual 2027 assessment.

Test the rate separately, too: at $157,500 of taxable value, one additional mill adds $157.50 annually, about $13.13 monthly. Valuation and rate uncertainty each affect the budget.

Put the monthly allowance alongside principal, interest, insurance and other expenses to estimate the full cost of homeownership. Ask the lender which tax assumption its payment estimate uses; a later increase can affect mortgage escrow payments.

PRE affects eligible taxes, not the valuation reset

Michigan’s principal residence exemption exempts a qualifying residence from local school operating taxes of up to 18 mills. Eligibility generally requires a qualified owner to own and occupy the property as a permanent home and claim the exemption. PRE does not remove every tax on the bill or prevent uncapping. Treasury’s PRE explanation

Eligible buyers claim PRE by filing Form 2368, revised July 2022, with the city or township assessor. Its instructions specify June 1 for the summer levy and November 1 for the winter levy. The 2026 property-tax calendar lists November 1, 2026, as the winter claim deadline; arrange filing with the assessor before that date.

Use the rate appropriate to your expected exemption status. If the selected rate already reflects full PRE, subtracting another 18 mills would understate the estimate.

Check transfer exceptions and the next assessment

Some transfers between spouses, specified family transfers and qualifying trust arrangements can avoid uncapping. Each exception has conditions; a family relationship or trust label alone does not establish eligibility. Ask the assessor about the applicable provision, and consult a Michigan real-estate attorney when the transfer structure or exception is uncertain. Transfer exemption guidance

The buyer must file Form 2766, the Property Transfer Affidavit, with the city or township assessor within 45 days of transfer. This filing is separate from the PRE affidavit.

When the 2027 assessment notice arrives, compare its assessed value or tentative SEV and taxable value with your assumptions. Check the recorded transfer, property characteristics and PRE percentage, then follow the notice’s review instructions promptly if something appears wrong. As values and millages are finalized, replace the provisional figures and give the updated estimate to your lender or servicer.