Open data

Michigan data downloads

Name: Michigan property tax millage rates
Creator: Michigan Porch
License: https://creativecommons.org/licenses/by/4.0/

These are the datasets behind Michigan Porch's calculators, as free JSON files. Use them in apps, spreadsheets, articles, or research. Each file names its official source and its vintage — the report and year the numbers come from — inside the file itself. The license and the credit line ride along too, so a copy that travels still says where it came from.

File format

One JSON object per dataset

The rows sit under the data key. The rest of the object describes the rows: source,vintage,lastUpdated,fields,rowCount,license,attribution, andciteAs. The endpoints are versioned under/data/v1/ and allow cross-origin requests, so a script or page on another site can fetch them directly.

Dataset

Michigan property tax millage rates

Total property tax millage rates for Michigan cities and townships, by school district. One mill is $1 of tax per $1,000 of Taxable Value. The rows are parsed from the Michigan Treasury 2025 Total Property Tax Rates report.

One row per city or township and school-district combination, covering all 83 counties. This file powers the Michigan Homebuyer Tax Calculator.

Rows: 3,574
Vintage: 2025 Michigan Treasury Total Property Tax Rates
Last updated: 2026-05-28
Source: Michigan Treasury 2025 Total Property Tax Rates report

Download millage-rates.jsonJSON · CC BY 4.0 · no key, no signup

License and citation

Licensed CC BY 4.0. Reuse is welcome, including commercial reuse. Keep this credit line with the data:

Data: Michigan Porch (michiganporch.com) — CC BY 4.0

For a formal reference, cite the file like this:

Michigan Porch, "Michigan property tax millage rates" (2025 Michigan Treasury Total Property Tax Rates). https://michiganporch.com/data/v1/millage-rates.json. CC BY 4.0. Underlying figures: Michigan Treasury 2025 Total Property Tax Rates report.

Field dictionary

Field	Type	Meaning
county	string	Michigan county name.
municipality	string	Local taxing unit name as printed in the Treasury report, for example "Alcona Twp".
unitCode	string	Six-digit Michigan Treasury code for the local unit of government.
schoolDistrict	string	School district name as printed in the Treasury report (uppercase, sometimes shortened). Some entries carry a tax-area or village suffix.
preMillage	number	Total millage, in mills, for a home with a Principal Residence Exemption (PRE). Does not include ad valorem special-assessment mills.
nonHomesteadMillage	number	Total millage, in mills, for non-homestead property — property without a PRE, such as rentals and second homes. Does not include ad valorem special-assessment mills.
preMillageWithSpecial	number	PRE millage including any ad valorem special-assessment mills the report lists for the unit.
nonHomesteadMillageWithSpecial	number	Non-homestead millage including any ad valorem special-assessment mills the report lists for the unit.
commercialPersonalMillage	number	Total millage the report lists for commercial personal property, in mills.
industrialPersonalMillage	number	Total millage the report lists for industrial personal property, in mills.
displayName	string	Reader-friendly unit name used on Michigan Porch, for example "Alcona Township".
type	string	Local unit type: "city", "township", or "village".
slug	string	Michigan Porch place identifier. The matching page is michiganporch.com/places/{slug}/.

Dataset

Michigan city income tax rates

The 24 Michigan cities that levy a city income tax, with resident and nonresident rates as decimals. Most cities use 1% for residents and 0.5% for nonresidents; Detroit, Grand Rapids, Highland Park, and Saginaw use higher rates.

One row per taxing city. This file powers the city income tax checker.

Rows: 24
Vintage: Michigan Treasury city-income-tax list and 2025 taxpayer manual
Last updated: 2026-05-29
Source: Michigan Treasury list of cities that impose an income tax

Download city-income-tax.jsonJSON · CC BY 4.0 · no key, no signup

License and citation

Licensed CC BY 4.0. Reuse is welcome, including commercial reuse. Keep this credit line with the data:

Data: Michigan Porch (michiganporch.com) — CC BY 4.0

For a formal reference, cite the file like this:

Michigan Porch, "Michigan city income tax rates" (Michigan Treasury city-income-tax list and 2025 taxpayer manual). https://michiganporch.com/data/v1/city-income-tax.json. CC BY 4.0. Underlying figures: Michigan Treasury list of cities that impose an income tax.

Field dictionary

Field	Type	Meaning
city	string	City name. City income tax applies inside the legal city boundary, not the wider mailing area that shares the city's name.
residentRate	number	Rate for people who live in the city, as a decimal (0.01 = 1%).
nonresidentRate	number	Rate for people who live elsewhere but earn wages inside the city, as a decimal (0.005 = 0.5%). It applies to the in-city wages.

Dataset

Michigan recurring deadlines

The recurring dates that matter to Michigan homeowners, homebuyers, movers, and the outdoors crowd — tax bills, PRE deadlines, the March Board of Review, license years, and season opens. The dates are the same for everyone statewide; each row links the page that explains it.

One row per recurring statewide date. This file powers the homepage calendar and the .ics feed.

Rows: 18
Vintage: Michigan statutes and 2026 agency pages, as cited per row
Last updated: 2026-07-08
Source: Official sources linked per row (Michigan Treasury, DNR, legislature.mi.gov)

Download deadlines.jsonJSON · CC BY 4.0 · no key, no signup

License and citation

Licensed CC BY 4.0. Reuse is welcome, including commercial reuse. Keep this credit line with the data:

Data: Michigan Porch (michiganporch.com) — CC BY 4.0

For a formal reference, cite the file like this:

Michigan Porch, "Michigan recurring deadlines" (Michigan statutes and 2026 agency pages, as cited per row). https://michiganporch.com/data/v1/deadlines.json. CC BY 4.0. Underlying figures: Official sources linked per row (Michigan Treasury, DNR, legislature.mi.gov).

Field dictionary

Field	Type	Meaning
slug	string	Stable event identifier.
label	string	Event name.
month	number	Month of the year, 1–12.
day	number	Day of month for fixed statutory or season dates. Absent when the date shifts year to year.
window	string	Display text for events without a fixed day, for example "The last Saturday in April".
audience	string	Who the date matters to: "buyer", "owner", "mover", or "outdoors".
blurb	string	One or two plain sentences on what the date means.
url	string	The michiganporch.com page that explains the date.
officialLabel	string	Name of the official source, when one is linked.
officialUrl	string	Official source URL, when one is linked.

Dataset

Michigan nearby property-tax pairs

Nearby places with the largest primary-home rate gaps inside a shared school district, ranked. Built by crossing the millage table with Census place centers; it is a proximity screen, not a municipal-border dataset.

One row per nearby pair, ranked by the rate gap. This file powers the nearby property-tax gap ranking.

Rows: 50
Vintage: 2025 Michigan Treasury Total Property Tax Rates
Last updated: 2026-07-31
Source: Michigan Treasury 2025 Total Property Tax Rates report + U.S. Census place centroids

Download boundary-pairs.jsonJSON · CC BY 4.0 · no key, no signup

License and citation

Licensed CC BY 4.0. Reuse is welcome, including commercial reuse. Keep this credit line with the data:

Data: Michigan Porch (michiganporch.com) — CC BY 4.0

For a formal reference, cite the file like this:

Michigan Porch, "Michigan nearby property-tax pairs" (2025 Michigan Treasury Total Property Tax Rates). https://michiganporch.com/data/v1/boundary-pairs.json. CC BY 4.0. Underlying figures: Michigan Treasury 2025 Total Property Tax Rates report + U.S. Census place centroids.

Field dictionary

Field	Type	Meaning
hi	string	Object: the higher-rate place — slug, name, county, type, pre (mills), nonHomestead (mills), population.
lo	string	Object: the lower-rate place, same shape as hi.
sharedDistrict	string	The school district both places levy inside — the control that isolates the municipal difference.
deltaMills	number	PRE millage gap between the two places inside the shared district.
deltaDollars300k	number	The gap in dollars per year on a $300,000 purchase (Taxable Value $150,000).
distanceKm	number	Distance between the two place centers, kilometers.
combinedPopulation	number	Both places' Census population estimates, summed.

License

License and attribution

Both files are licensedCreative Commons Attribution 4.0 (CC BY 4.0). You can copy, reshape, and republish the data — in a product, a story, a model, or a class project — as long as the credit line stays with it.

The State of Michigan publishes the underlying figures. The license covers Michigan Porch's cleaned, combined, and documented files. When a number is load-bearing for your work, check it against the official source linked on each dataset — that source decides.

Sources and review

The official sources

Michigan Porch parses and rechecks official state publications. These are the documents behind the two files.

Last reviewed: July 31, 2026

Michigan Treasury millage-rate reports for official local millage-rate reports.
2025 Total Property Tax Rates PDF for source file parsed into the statewide Michigan Porch millage data.
State of Michigan property tax estimator for official parcel-oriented property tax estimate.
Michigan Treasury list of cities that impose income tax for current list of city income tax authorities.
2025 Michigan Treasury Taxpayer Assistance Manual for standard-rate structure and the four higher-rate cities.
2026 City of Detroit withholding guide for current Detroit resident, nonresident, and wage-allocation rates.
City of Grand Rapids individual income-tax guide for current Grand Rapids resident and nonresident rates.
City of Highland Park income tax for current Highland Park resident and nonresident rates.
City of Saginaw income-tax FAQ for current Saginaw resident and nonresident rates.
Michigan City Income Tax Act for state law behind city income tax.

Use this carefully: These files are planning aids. The local assessor, city treasurer, or Michigan Treasury controls the official number for a specific parcel, taxpayer, or year.

Rules, rates, forms, office practices, and local facts can change. For a legal, tax, insurance, safety, or filing decision, confirm the current details with the responsible office or a qualified Michigan professional.

Next steps

Where to next

The tools these files power, plus the rest of the toolbox.

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