Michigan property tax uncapping is what happens to the taxable value of a house the year after it changes hands. While one owner keeps a property, its taxable value can only rise by the rate of inflation or 5%, whichever is lower. When ownership transfers, that cap comes off and the taxable value resets to the assessed value, which is 50% of what the house is worth. The buyer's first full tax bill is calculated on that reset number, not on whatever the seller was paying. On a $325,000 purchase from a long-term owner, the gap is routinely $2,000 to $3,500 a year.
In short
- Taxable value is capped at the lower of inflation or 5% a year while a property stays with one owner. Proposal A of 1994, MCL 211.27a.
- A transfer of ownership uncaps it in the calendar year following the transfer, not immediately at closing.
- It resets to the assessed value: 50% of true cash value. A $325,000 sale means a taxable value near $162,500.
- The seller's tax figure on the listing tells the buyer nothing about their own bill.
- Some transfers between close family are exempt from uncapping under MCL 211.27a(7). The form still has to be filed.
What uncapping actually is
Every Michigan property carries two numbers. The assessed value is set by the local assessor at 50% of true cash value, which is the market figure, and it moves every year with the market. The taxable value is the number the millage is actually applied to, and since Proposal A of 1994 it has been held on a leash: it can rise by the rate of inflation or 5% each year, whichever is lower.
Hold a house for fifteen years in a market that grew faster than inflation, and those two numbers drift a long way apart. The assessed value follows the market up. The taxable value crawls. That gap is the whole reason a long-term owner's tax bill looks impossibly cheap to anyone reading a listing.
A transfer of ownership ends it. The Michigan Department of Treasury puts it plainly on its uncapping page: a transfer of ownership causes the taxable value to uncap in the calendar year following the year of the transfer. The two numbers snap back together, and the cap starts again from there under the new owner.
The timing catches people out. A house that closes in June 2026 is still billed on the seller's capped taxable value for the rest of 2026. The reset lands on the 2027 bill. By then the buyer has been in the house for months, has budgeted around the payment they have been making, and has forgotten the conversation.
Why the number on the listing is not your number
Here is the arithmetic, using the defaults in our Michigan uncapping calculator: a $325,000 purchase, a seller whose taxable value had drifted down to $95,000, and a local rate of 38 mills.
The seller was paying $95,000 × 38 ÷ 1,000, which is $3,610 a year. The buyer's taxable value resets to $162,500, half the purchase price. That is $162,500 × 38 ÷ 1,000, or $6,175 a year. The bill goes up by $2,565, which is about $214 a month on an escrow payment nobody warned them about.
How big the jump is depends almost entirely on how long the seller had owned the place. At the same price and the same millage:
| Seller's taxable value | Seller was paying | Buyer will pay | The jump | |---|---|---|---| | $75,000 | $2,850 | $6,175 | $3,325 | | $95,000 | $3,610 | $6,175 | $2,565 | | $120,000 | $4,560 | $6,175 | $1,615 | | $150,000 | $5,700 | $6,175 | $475 |
The right-hand column is the number a buyer needs before they write an offer, and it is the one number no listing carries. Note what does not change: the buyer's bill is $6,175 in every row. Uncapping does not care what the seller paid. It only cares what the house is worth now.
What counts as a transfer of ownership, and what does not
MCL 211.27a(6) defines a transfer of ownership as the conveyance of title to, or a present interest in, property whose value is substantially equal to the value of the fee interest. A sale is the obvious one. So are many things people do not think of as sales: a land contract, a lease of more than 35 years, a transfer into or out of certain trusts, a distribution from an estate.
MCL 211.27a(7) then lists the transfers that are exempt from that definition, and this is the half of the internet that Michigan estate lawyers have written about at length. Transfers between spouses do not uncap. Nor, under the residential provision added in 2013, do transfers to a close relative, meaning a parent, child, grandparent, grandchild, sibling or their spouses, provided the property stays residential and is not used for commercial purposes after the transfer.
Two things get missed about the family exemptions.
The first is that "does not uncap" is not "nothing to do". The exemption is claimed on the Property Transfer Affidavit. Not filing does not claim it, and an assessor with no affidavit on file has no reason to treat the transfer as exempt.
The second is that the exemption protects the taxable value, not the Principal Residence Exemption. A child who inherits a parent's house and does not live in it loses the 18-mill school operating exemption under MCL 211.7cc even though the taxable value stayed capped. The bill still goes up, just for a different reason.
If a family transfer is on the table, this is a question for a Michigan real estate or estate attorney, not for a blog post and not for us. What we can tell you is that the filing is not optional either way.
How to work out your own number, in order
- Take the purchase price and halve it. That is close enough to the assessed value the year after transfer to plan with. A $290,000 purchase means a taxable value near $145,000. The assessor's own figure may land a little either side of it, because true cash value is their estimate, not the sale price, but the sale price is the best proxy a buyer has.
- Find the millage rate for the city or township, not the county. Michigan rates vary widely between neighbouring communities, and the difference between 32 mills and 48 mills on the same house is thousands of dollars a year. The local government publishes its rate, and the assessor's office will confirm it.
- Multiply, then divide by a thousand. Taxable value × millage ÷ 1,000 is the annual tax. Half of it arrives on the summer levy and half on the winter one.
- Subtract 18 mills first if it will be your principal residence. The Principal Residence Exemption takes up to 18 mills of local school operating tax off the bill for a home you own and occupy. On a $162,500 taxable value that is worth $2,925 a year, and it is claimed on a separate form with its own deadline.
- Compare that to the figure on the listing. The difference is what the buyer has to find every month from the year after closing. Run it in the calculator if you would rather see it move.
The mistake most people make at step 5
Treating it as a rounding error. A $2,565 annual increase is $214 a month, and a buyer who qualified at the top of their budget on an escrow estimate built from the seller's tax figure is now short. Lenders often escrow the first year on the seller's number because that is the number on record when the loan closes, which means the shortfall shows up as an escrow analysis twelve to eighteen months later, with a catch-up spread over the following year on top.
The other mistake is assuming an exempt transfer is a quiet one. It is not. Under MCL 211.27b, when an assessor discovers an unreported transfer, the taxable value is corrected anyway and the buyer is billed for the additional tax back to the date of transfer, with interest and penalty, plus a daily penalty on the missing form. The Property Transfer Affidavit has its own 45-day clock and its own penalty schedule, and it runs from the transfer date whether or not anyone remembered.
What we build for this
For agents and teams, uncapping is a conversation that goes well before the offer and badly after the bill. The buyer who hears the number from you in week one is a buyer who budgeted for it. The buyer who hears it from the assessor in month fourteen is a phone call you did not want.
Our real estate page describes the post-closing sequence: the uncapped estimate, the affidavit deadline and the Principal Residence Exemption dates, computed from the actual closing date and sent to the buyer under the agent's name rather than ours. Nobody has to remember to send anything.
If you have a buyer under contract right now, the calculator above will give you their number in about thirty seconds, and that conversation is free. If you would rather it happened for every buyer without you doing it, talk to us.
