A Michigan property tax map is a county-maintained parcel map that shows every taxable piece of land, its parcel identification number, legal description, classification, and assessment values. You find it through your county’s online GIS portal or, in most jurisdictions, through BS&A Online. The map is a public record and free to view, but it is not a legal boundary document and should never substitute for a survey.
Where to Find the Map Online
Start with the county. Every Michigan county maintains parcel data through its Equalization Department, and most publish it through an online viewer you can reach from the county website. Two paths cover almost everyone.
The first is BS&A Online, a platform built for local government that hosts tax and assessment records for a large share of Michigan counties, cities, and townships.1BS&A Software. Local Government Software If a Michigan property search has ever dropped you onto a standardized blue interface with tax and assessment tabs, that was BS&A. The second is a county’s own GIS viewer, which usually layers interactive maps over aerial photography and allows downloads at no cost.2Emmet County, MI. GIS
For a wider view across jurisdictions, the Michigan GIS Open Data portal, run by the Department of Technology, Management and Budget, serves as a single entry point for state geospatial data including parcel layers.3State of Michigan. DTMB – Maps and Geographic Information Systems The state portal is broad; for parcel-level detail you’ll end up back at the county.
If what you need isn’t on any portal, such as building improvement history or older assessment records, contact the local township or city assessor directly. Those offices hold the most current records on recent lot splits, boundary adjustments, and new construction.4Allegan County, MI. Property Records
How to Search Once You’re In
County portals generally let you search three ways: by street address, by parcel identification number, or by the current owner’s name.2Emmet County, MI. GIS Enter any one and the map centers on the matching parcel. Toggle between a standard map and satellite imagery to see how the drawn parcel lines sit against driveways, tree lines, and buildings.
Most viewers also offer optional layers. Zoning boundaries, floodplains, wetlands, topography, and school district lines can usually be turned on and off. Zoom in tight on your parcel and you can see whether a fence or shed appears to sit near a line, though the map is not precise enough to settle that question.
What the Parcel Record Shows
The anchor of every record is the Property Identification Number, or PIN. Michigan’s General Property Tax Act requires this number on ownership transfer documents, and every assessor, treasurer, and title company uses it to track the land.5Michigan Legislature. The General Property Tax Act – Act 206 of 1893
Alongside the PIN, you’ll see the legal description, lot dimensions or acreage, and the parcel’s position relative to neighboring parcels, roads, and public rights-of-way. County equalization offices create and maintain these graphic representations of legal descriptions for all property within their jurisdiction.6Crawford County Michigan. Equalization Easements and shared access points that affect use of the land typically appear as well.
Each parcel also carries a property classification assigned under Michigan law. The categories are residential, commercial, industrial, agricultural, developmental, and timber-cutover. Classification determines which millage rates apply, and the lines are not always intuitive: an apartment complex with more than four units is classified commercial, not residential, and so are golf courses and boat clubs.7Michigan Legislature. MCL – Section 211.34c
Reading the Assessed and Taxable Values
Two dollar figures appear on every parcel record, and they do different jobs. Assessed value is set at 50% of the property’s estimated market value as of the prior December 31. Taxable value is the number your tax bill is actually calculated from.
They differ because of Proposal A, which Michigan voters approved in 1994. Taxable value can only rise each year by the lesser of 5% or the rate of inflation, no matter how fast assessed value climbs. For 2026, the Consumer Price Index multiplier is 1.027, capping taxable value increases at 2.7% on properties that haven’t changed hands.8Delhi Township, MI. Frequently Asked Questions That cap is why a long-time owner’s taxable value often sits well below half of what the house would sell for, and why two neighboring parcels with similar market values can show very different taxable values on the map.
A millage rate is the tax per $1,000 of taxable value. A taxable value of $100,000 at a total rate of 40.0000 mills produces an annual bill of $4,000.9City of Holland, MI. Tax Bill Estimator and Millage Rates If the parcel is the owner’s primary home, the Principal Residence Exemption removes up to 18 mills of local school operating tax, which on a $100,000 taxable value is $1,800 per year.10State of Michigan. Principal Residence Exemption Rental properties and second homes don’t qualify, so identical parcels can carry very different bills.
Ordering an Official or Certified Copy
When you need a physical or certified map for a mortgage, building permit, or legal matter, the request goes to the county Register of Deeds or Equalization Department. Fees vary by county and by document.
Oakland County charges $1.00 for a standard letter-size plat drawing and up to $20.00 for a 36-by-44-inch aerial map, with high-ink prints costing more than line drawings at every size.11Oakland County, MI. Fees and Forms Other counties use flat per-parcel pricing; Gratiot County charges $5.00 per parcel for a hard copy of property tax and assessment information.12Gratiot County, MI. Gratiot County Parcel Lookup Most offices accept cards through their portals and cash or check in person, and you can usually choose a digital PDF for quick turnaround or a large-format print for a job site.
Why the Map Is Not a Legal Boundary
This is where people get hurt. A tax map exists so the county can track who owns what for tax purposes. It does not establish where your property legally begins and ends. Boundary lines on a GIS portal are approximate, often drawn from historical data that may not reflect recent changes, and typically refreshed only once a year.
Treating a tax map as a boundary record and then building a fence, pouring a driveway, or clearing trees near a line can mean trespassing on a neighbor, a boundary dispute, and the cost of removing the work. County GIS staff are not surveyors and cannot resolve boundary questions.
Before construction near a property line, before buying or selling land where the line matters, and before any neighbor dispute about where a line falls, hire a licensed professional surveyor. Michigan regulates land surveyors under the Professional Surveyors Act. A boundary survey involves locating physical markers, examining deeds and historical records, and producing a legally defensible determination of the lines. The tax map tells you the parcel’s general shape and acreage. A survey tells you where you can and can’t build.
Fixing an Error on the Record
If the map or record shows the wrong lot size, an incorrect legal description, or another clerical mistake, the correction runs through the local Board of Review. Michigan law requires special Board of Review meetings in July and December specifically to correct clerical errors and mutual mistakes of fact.13City of Oak Park, MI. Assessing Start by calling the township or city assessor; they will tell you what documentation to bring and schedule you for the next meeting. A disagreement about value is a separate process that runs through the March Board of Review and, if needed, the Michigan Tax Tribunal.