Algonac property taxes & housing data
Algonac is taxed at 37.2823 mills across 1 school district. That is 10.22 mills above the St. Clair County median and 4.68 mills above the Southeast Michigan median — the 24th lowest of 31 municipalities in the county, and 143 of 236 region-wide.
Rates by school district
| School district | Homestead | Non-homestead | $250,000 | $350,000 | $500,000 |
|---|---|---|---|---|---|
| Algonac Community School District | 37.2823 | 55.2823 | $4,660 | $6,524 | $9,321 |
Homestead (PRE) applies to your primary residence. Non-homestead applies to rentals and second homes. Dollar columns are the annual bill at the uncapped taxable value — half the purchase price — at the homestead rate.
How Algonac compares in St. Clair County
| Municipality | Lowest millage | Annual tax on $350,000 |
|---|---|---|
| Kenockee Township | 27.6076 | $4,831 |
| Fort Gratiot Township | 28.1448 | $4,925 |
| Brockway Township | 28.6411 | $5,012 |
| Port Huron Township | 30.9408 | $5,415 |
| Algonac | 37.2823 | $6,524 |
| Marine City | 38.1132 | $6,670 |
| St. Clair | 38.9814 | $6,822 |
| Marysville | 39.9654 | $6,994 |
| Port Huron | 41.3099 | $7,229 |
← Port Huron Township (lower) · Marine City (higher) →
For sale in Algonac right now
26 active listings in Algonac — the 6 newest below. Remember: every one of them uncaps the year after closing, so the bill you should budget is the uncapped one above, not the seller's.
$179,900
549 Edwards ST · Algonac
3 bd · 1 ba · 1,000 sqft
Listing courtesy of Real Estate One Clinton
$589,000
850 Townsend DR · Algonac
4 bd · 3 ba · 2,460 sqft
Listing courtesy of Real Estate One Westrick
$224,900
703 Smith ST · Algonac
3 bd · 2 ba · 1,456 sqft
Listing courtesy of Epique Realty
$424,900
136 Channelsyde DR · Algonac
3 bd · 3 ba · 2,375 sqft
Listing courtesy of Wallace and Associates Real Estate
$369,900
2037 W Park DR · Algonac
3 bd · 3 ba · 1,595 sqft
Listing courtesy of Community Choice Realty Inc
$237,499
474 Maple ST · Algonac
3 bd · 2 ba · 1,326 sqft
Listing courtesy of Epique Inc.
IDX provided courtesy of Realcomp II Ltd. via Match Realty LLC and MiRealSource, Realcomp II Ltd, ©2026 Realcomp II Ltd. Shareholders. The accuracy of all information, regardless of source, is not guaranteed or warranted. All information should be independently verified. Listings refreshed 2026-11-02T23:11+00:00; refreshed at least twice daily.
Waterfront in Algonac: St. Clair River · Lake St. Clair — recorded sale prices and all-sports status for each.
Compare Algonac with another community
Algonac has 6 side-by-side comparisons, 2 of them with a community that shares a school district — same schools, different bill. Dollar columns are the annual homestead bill on a $350,000 home at the uncapped taxable value, and the last column is the difference against Algonac.
| Comparison | Their lowest millage | Annual tax on $350,000 | vs Algonac |
|---|---|---|---|
| Algonac vs Clay Township · same schools | 25.2550 | $4,420 | −$2,105 |
| Algonac vs Ira Township · same schools | 27.5526 | $4,822 | −$1,703 |
| Algonac vs Brockway Township | 28.6411 | $5,012 | −$1,512 |
| Algonac vs Port Huron Township | 30.9408 | $5,415 | −$1,110 |
| Algonac vs St. Clair | 38.9814 | $6,822 | +$297 |
| Algonac vs Marine City | 38.1132 | $6,670 | +$145 |
Look up, pay and appeal your Algonac taxes
Algonac bills twice a year. The summer bill is issued July 1 and the winter bill December 1; most communities make them due September 14 and February 14, and anything still unpaid on March 1 moves to the county treasurer as delinquent, with interest added monthly. Both bills are collected by the Algonac treasurer, so the balance on a specific parcel is on the city or township site first (most of Southeast Michigan uses BS&A Online for this) and on the county site once it is late.
- St. Clair County property tax & maps search — parcel and tax search for Saint Clair County addresses.
- St. Clair County Treasurer — where a bill goes once it is delinquent: balances, payment plans and the hardship deferral.
- Estimate a bill before you look one up — the figure on the current owner's statement is capped; this gives you the uncapped one.
Appealing the assessment
Assessment notices go out in late February. If the assessed value is more than half of what the house would actually sell for, the appeal runs in two steps and the first one cannot be skipped: the March Board of Review in Algonac (dates and the petition form are on the assessor's notice), then, if the board does not move, a petition to the Michigan Tax Tribunal by July 31 for residential property. The July and December boards do not re-value: they correct qualified errors (clerical mistakes, mutual mistakes of fact, a wrong principal residence exemption) and hear poverty exemptions. A successful appeal lowers the assessed value, not the millage — the 37.2823 mills above apply to whatever value stands after it.
A home bought this year is a special case: the taxable value uncaps to the assessed value next year regardless of the appeal, so the number to check on the first notice after closing is the assessed value against the price you paid.
What it's like to own in Algonac
Beyond the tax rate, three things shape what owning in Algonac actually costs: the age of the homes, what the water utility reports at the tap, and what local air testing has turned up. Each figure below carries the date of the survey it came from.
Housing stock
1964
average year built · 1,459 sqft average across 1,102 single-family homes
SEMCOG Buildings_2024
Radon
1.2 pCi/L
average across 20 home tests · 7% above the EPA 4 pCi/L action level — low. ZIP 48001.
MDHHS indoor radon test results by ZIP
Lead is measured at the water system, not the house — it cannot tell you whether a specific property has a lead service line. Radon is a ZIP-level test distribution, not a prediction for any one home; the EPA recommends testing every home regardless. Screening information only.
Common questions
What is the property tax rate in Algonac, Michigan?
Algonac is taxed at 37.2823 mills for a homestead (principal residence) under the official 2025 Michigan Department of Treasury millage report. On a $350,000 home at the uncapped taxable value that is about $6,524 a year.
Does the tax rate change by address within Algonac?
No. All of Algonac sits in Algonac Community School District, so the millage is 37.2823 at every address in the municipality. Your bill still changes after you buy, because it is recalculated on the uncapped taxable value rather than the seller's capped one.
How much are property taxes on a $350,000 home in Algonac?
About $6,524 a year at the homestead rate. Michigan taxes the taxable value, not the sale price, and after a sale that value uncaps to roughly half what you paid — so $350,000 is taxed on about $175,000.
Why is the tax bill on a Algonac listing lower than what I would pay?
Because the figure on the listing is the seller's. Michigan caps annual taxable-value growth while an owner keeps the property, and that cap is removed the year after it sells. The longer the seller owned it, the further their bill sits below yours.
How does Algonac compare with the rest of St. Clair County?
It is the 24 lowest of 31 municipalities in St. Clair County and 143 of 236 across the eight-county region — 10.22 mills above the county median.
How do I look up or pay my Algonac property tax bill?
Summer and winter bills are collected by the Algonac treasurer, so the balance on a parcel is on the municipality's own site (usually BS&A Online). Once a bill is delinquent — March 1 — it moves to the St. Clair County Treasurer, whose parcel search covers every address in the county.
How do I appeal my Algonac property tax assessment?
Petition the Algonac March Board of Review first — the dates are on the assessment notice mailed in late February — and, if that fails, the Michigan Tax Tribunal by July 31 for residential property. The board step is mandatory; the Tribunal will not hear a residential appeal that skipped it. An appeal changes the assessed value, not the millage (37.2823 mills).
What your Algonac taxes become after you buy
Michigan taxable value uncaps the year after a sale and resets to roughly half the purchase price. The calculator below is already set to Algonac — enter a price and the seller's current taxable value.
Uncapping calculator
When a Michigan home changes hands, its taxable value uncaps the following year and resets to roughly half the sale price. Buyers routinely get blindsided by a bill that's thousands higher than the listing showed. Here's your actual number.
What will your tax bill be after closing?
Your taxable value uncaps the year after closing and resets to roughly half the purchase price — so a $350,000 home is taxed on about $175,000, whatever the seller was paying. Enter the price and the current taxable value below.