Michigan’s property tax system has two numbers that matter — and most new buyers only know about one of them. The State Equalized Value (SEV) is what you see on listing sheets and county records; it’s set at roughly 50% of market value. But the number your tax bill is actually calculated on is the Taxable Value (TV) — a separate, inflation-capped figure that grows slowly over time and resets only when you buy. Understanding the gap between these two numbers, claiming the Principal Residence Exemption before the deadline, and filing a parcel ID lookup in the right county portal are the three moves that determine what you’ll pay in Michigan property taxes. This guide covers all three, plus the appeal path if your assessment is off.
What Is a Michigan Parcel ID Number?
Every parcel of real property in Michigan is assigned a unique Parcel ID (also called a Parcel Number, Property ID, or Tax ID) by the local assessing unit — which in Michigan is the township or city, not the county. Michigan is one of the few states where assessment responsibility sits at the local unit level rather than the county. The parcel ID is maintained by the local assessor and registered with the county equalization department.
You’ll see the parcel ID labeled as:
- Parcel ID or Parcel Number
- Property Number or Property ID
- Tax ID or Tax Parcel Number
- Sidwell Number (a legacy term from early mapping systems still used in some counties)
How to Read a Michigan Parcel ID
Michigan parcel IDs follow a hierarchical structure that encodes county, township, section, and lot information. The format varies by county but the most common statewide pattern is:
County – Township – Section – Quarter – Parcel
Example: 26-07-18-400-008
Example (Wayne/Oakland): 07-18-01-226-013
| Segment | What It Represents |
|---|---|
| 26 | State FIPS prefix (Michigan = 26) |
| 07 | County number within the state |
| 18 | Township or city code within the county |
| 400 | Section and quarter-section identifier |
| 008 | Individual parcel within that section |
Some counties display the parcel number with dashes, others without. Platted subdivisions often use a lot-block format instead. Use the exact format shown in your county’s BS&A or GIS portal when searching.
How to Find Your Michigan Parcel ID
1. Check Your Property Tax Bill
Michigan counties mail a summer tax bill (July 1) and a winter tax bill (December 1). Your parcel ID is printed prominently on both. The summer bill typically covers school operating taxes and some local levies; the winter bill covers county, township, and remaining local levies.
2. Search BS&A Online
The majority of Michigan counties use BS&A Software at bsaonline.com as their property search platform. Search by address, owner name, or parcel number to retrieve your parcel ID, SEV, Taxable Value, PRE status, and tax history. Each county has its own entry point — see the county directory at the end of this article.
3. Use the County GIS Portal
Most Michigan counties also maintain a GIS parcel viewer where you can click on a map to pull up the parcel ID and assessed values. Oakland, Wayne, Kent, and Washtenaw counties have particularly robust GIS systems integrated with their BS&A data.
4. Check Your Deed or Closing Documents
Your deed is recorded with the County Register of Deeds. Michigan deeds reference the parcel ID and legal description. Your title commitment and closing disclosure also list the parcel number. When you purchase a property, you are required to file a Property Transfer Affidavit (Form L-4260) with the local assessor within 45 days — the assessor uses this to “uncap” your Taxable Value (see below).
Michigan’s Two Assessed Values: SEV vs. Taxable Value
This is the most important — and most misunderstood — aspect of Michigan property taxation.
State Equalized Value (SEV)
The SEV is set at 50% of True Cash Value (market value) as of December 31 of the prior year. Every county’s assessments are reviewed and equalized by the State Tax Commission to ensure that no county is systematically over- or under-assessing relative to market. The SEV on your county record is your best starting point for an assessment appeal.
Taxable Value (TV) — The Proposal A Cap
Since Proposal A passed in 1994, the Taxable Value — the number your millage rate is applied to — is capped at the lesser of:
- The SEV, or
- The prior year’s TV, increased by the inflation rate or 5%, whichever is lower
Over time, the TV of a long-held property falls far below the SEV. A neighbor who bought in 2005 might have a TV of $140,000 on a home with a current SEV of $220,000 — their taxes are calculated on $140,000.
Uncapping at Transfer
When a property sells or transfers in a taxable change of ownership, the TV “uncaps” — it resets to the SEV in the first year after the transfer. This is why your tax bill after purchase may be significantly higher than the prior owner’s. Always check both the SEV and TV on a listing before making an offer; the TV tells you the prior owner’s tax base, but after closing, your taxes will be based on the new SEV.
Example: Home sells for $400,000. SEV = $200,000. Prior owner’s TV = $130,000. After your purchase: TV uncaps to $200,000. At a combined millage rate of 45 mills, your annual tax = $200,000 × 45 ÷ 1,000 = $9,000 — vs. the prior owner’s $5,850.
Michigan Millage Rates by County
Michigan taxes are expressed in mills (1 mill = $1 per $1,000 of Taxable Value). Combined millage rates include county, township/city, school district, and special levies. Rates vary significantly within counties depending on municipality and school district.
| County | Typical Combined Rate (mills) | Effective Rate on Market Value | Notes |
|---|---|---|---|
| Wayne (Detroit) | ~67–90 mills | ~1.7–2.25% | City of Detroit highest in state; suburbs lower |
| Oakland | ~40–55 mills | ~1.0–1.4% | Southeast MI suburb; wide range by city |
| Macomb | ~38–52 mills | ~0.95–1.3% | Northeast Detroit suburbs |
| Kent (Grand Rapids) | ~38–48 mills | ~0.95–1.2% | West Michigan; city rates higher |
| Washtenaw (Ann Arbor) | ~42–56 mills | ~1.05–1.4% | University city; high property values |
| Ingham (Lansing) | ~48–65 mills | ~1.2–1.6% | State capital; city rates elevated |
| Kalamazoo | ~40–52 mills | ~1.0–1.3% | Mid-size metro; moderate rates |
| Livingston | ~28–38 mills | ~0.7–0.95% | Oakland suburb; lower rates, high growth |
| Ottawa (Holland) | ~30–42 mills | ~0.75–1.05% | West Michigan; competitive rates |
| Grand Traverse (Traverse City) | ~25–38 mills | ~0.63–0.95% | Northern lower peninsula; resort market |
The effective rate on market value is approximately: millage rate ÷ 1,000 × 50% (because TV is based on SEV which is 50% of market, and TV may be lower still).
Michigan Property Tax Exemptions
Principal Residence Exemption (PRE)
Michigan’s most valuable exemption — and the one most buyers miss. If you occupy the property as your principal residence, you are exempt from the school operating millage, which typically ranges from 16 to 20 mills depending on the school district. On a $200,000 Taxable Value, that’s a saving of roughly $3,200–$4,000 per year.
To claim it: file Form 2368 (Principal Residence Exemption Affidavit) with your local township or city assessor by June 1 for the summer tax bill, or by November 1 for the winter tax bill. File as soon as you close — don’t wait. If you miss the deadline, you’ll pay school operating taxes for that tax year and must refile.
If you move and rent the property or buy a new home, you must rescind the PRE on the old property using Form 2602 within 90 days.
Poverty Exemption
Homeowners whose household income is at or below the federal poverty level may apply for a poverty exemption that reduces or eliminates their property tax. Apply to your local Board of Review in March, with income documentation. Income guidelines are set by each local assessing unit.
Disabled Veterans Exemption
Veterans with a 100% service-connected disability, or who are “individually unemployable” with a permanent and total disability rating, qualify for a full property tax exemption on their primary residence under Public Act 161 of 2013. Surviving spouses may continue the exemption. File with the local assessor — there is no income limit.
Homestead Property Tax Credit (State Income Tax)
Michigan’s Homestead Property Tax Credit is a refundable credit on the state income tax return (Form MI-1040CR) available to homeowners and renters whose property taxes exceed a percentage of their household income. It provides relief to low- and moderate-income households — particularly valuable in high-millage cities. File with your annual state income tax return.
How to Appeal Your Michigan Assessment
Michigan’s appeal calendar is strict. The primary window is short and tied to the annual assessment notice.
Step 1: Review Your Assessment Notice
Every year in late February or early March, you receive an Assessment Change Notice showing your new SEV and TV. Compare the SEV to recent comparable sales — if the SEV exceeds 50% of what similar homes are selling for, you have grounds to appeal.
Step 2: March Board of Review
The March Board of Review meets the second week of March in most townships and cities. File a written appeal or appear in person. Bring recent comparable sales (within 6 months of December 31 of the prior year) and documentation of any property defects. The Board can adjust your SEV and TV. This is the primary and most accessible appeal level — most assessment reductions happen here.
Step 3: Michigan Tax Tribunal
If unsatisfied with the Board of Review’s decision, file a petition with the Michigan Tax Tribunal (MTT) by July 31 of the tax year (residential properties). The MTT is an independent state agency that conducts formal hearings and issues binding orders. It handles valuation disputes, classification errors, and PRE denials. For commercial properties, the MTT Small Claims Division handles cases valued under $100,000.
When Are Michigan Property Taxes Due?
Michigan property taxes are split into two bills per year, mailed by the local treasurer:
| Bill | Mailed | Due Date | Penalty After Due Date |
|---|---|---|---|
| Summer tax bill | July 1 | September 14 | 1% per month |
| Winter tax bill | December 1 | February 14 | Varies by township; typically 3% then 1%/month |
Some townships allow summer taxes to be deferred to February for qualifying seniors or disabled homeowners. Unpaid taxes after February 28 are returned to the county treasurer as delinquent, accruing interest at 1% per month. After two years of delinquency, the county may begin forfeiture proceedings.
Property Transfer Affidavit — Don’t Skip This
After purchasing a Michigan property, you must file a Property Transfer Affidavit (Form L-4260) with the local township or city assessor within 45 days of the transfer date. Failure to file results in a penalty of $5/day (up to $200 for residential properties) and delays the TV uncapping process. Your title company may file this for you at closing — confirm this before you leave the closing table.
Michigan Parcel ID vs. Other Identifiers
| Identifier | Assigned By | What It Identifies |
|---|---|---|
| Parcel ID / Sidwell Number | Local township/city assessor | The parcel in the local assessment roll |
| Liber / Page (deed book/page) | County Register of Deeds | The recorded deed document |
| Lot/Block/Plat | Recorded plat | Legal description in subdivision plat |
| PRE Number | Local assessor / Michigan Treasury | Tracks Principal Residence Exemption status |
| FIPS Code | U.S. Census Bureau | MI county in federal datasets (26XXX) |
Search Michigan Property Records by County
Most Michigan counties use BS&A Online. Select your county below or search directly at bsaonline.com:
- Wayne County (Detroit) — Wayne County on BS&A Online
- Oakland County — Oakland County on BS&A Online
- Macomb County — Macomb County on BS&A Online
- Kent County (Grand Rapids) — Kent County on BS&A Online
- Washtenaw County (Ann Arbor) — Washtenaw County on BS&A Online
- Ingham County (Lansing) — Ingham County on BS&A Online
- Genesee County (Flint) — geneseecounty.prosgar.com
- Kalamazoo County — Kalamazoo County on BS&A Online
- Ottawa County (Holland) — Ottawa County on BS&A Online
- Livingston County — Livingston County on BS&A Online
For all 83 counties, use the interactive map below or visit bsaonline.com/MunicipalDirectory and filter by Michigan.
Bottom Line
The two actions every Michigan buyer should take immediately after closing: file the Property Transfer Affidavit within 45 days and file your Principal Residence Exemption before June 1. Miss either one and you’ll pay more than you should. Then check your Assessment Change Notice in March — if the SEV is above 50% of what you paid, the March Board of Review is a fast, informal way to get it corrected. The Taxable Value will be at SEV for your first full year of ownership and then begin to grow slowly; the gap between TV and SEV that builds over time is a real financial benefit of long-term Michigan homeownership that other states can’t match. Use the BS&A Online portal linked from your county to verify your parcel ID, SEV, TV, PRE status, and tax history anytime.
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