Understanding Property Tax Mill Rates in Canada

A mill rate, sometimes called a tax rate, is the amount of property tax charged per $1,000 of assessed property value. The word comes from the Latin millesimum, one thousandth. A mill rate of 10 means $10 of tax for every $1,000 of assessed value, or 1% of assessed value. Some provinces and municipalities publish the figure as a percentage instead, and some publish it per $1,000 while others use per $100,000; OpenStats city pages normalize this so rates can be compared on a common basis.

The mill rate itself is only half the calculation. The other half is the assessed value the rate is applied to, and that assessed value is set by a separate process that varies by province, sometimes substantially from the property's market value.

How the rate is set

Each municipality sets its own mill rate annually as part of its budget process. In simple terms, council decides how much revenue the municipality needs from property tax, divides that figure by the total assessed value of taxable property in the municipality, and the result is the mill rate for the year. When total assessed value rises across a municipality (property values going up broadly), a municipality holding its budget flat will typically lower its mill rate to avoid an automatic revenue windfall purely from valuation growth. This is why a falling mill rate does not necessarily mean falling taxes, and a rising mill rate does not necessarily mean a bigger municipal budget. The two figures, rate and assessed value, have to be read together.

Assessment bases differ by province

Property assessment in Canada is a provincial responsibility, and the methods differ enough that a mill rate from one province is not directly comparable to a mill rate from another without also knowing how assessed value is calculated there.

• Ontario uses the Municipal Property Assessment Corporation (MPAC), which assesses properties on a four-year cycle intended to approximate current value, phased in gradually to smooth large swings.
• British Columbia uses BC Assessment, which reassesses annually based on market value as of July 1 the prior year, so assessed values there tend to track market value more closely and more often than in provinces with longer reassessment cycles.
• Alberta requires municipalities to assess at market value annually, with oversight from the province, and municipalities set their own mill rates within that framework.
• Nova Scotia uses a capped assessment program for most residential properties, which limits how quickly a property's taxable assessment can rise year over year even if market value rises faster, decoupling assessed value from market value over time for long-held properties.

Because of these differences, a municipality with a high mill rate is not automatically a high-tax municipality, and one with a low mill rate is not automatically a low-tax one. A city that assesses close to full market value can post a lower mill rate and still collect a similar or larger dollar amount of tax than a city with an older, capped, or lagging assessment base and a higher mill rate.

Comparing cities without getting misled

The only reliable way to compare the tax burden between two municipalities is to estimate the dollar tax bill on a comparable property value in each place, rather than comparing mill rates directly. That is the approach OpenStats city pages take: each page pairs the current municipal mill rate with an estimated tax bill on a representative home value, and where a calculator is available, it lets a reader plug in their own assessed value to get an estimate specific to their property.

A short comparison checklist

• Check whether each city's assessed values track market value closely or lag behind it.
• Compare estimated dollar tax bills on a similar property value, not raw mill rates.
• Note whether the figure includes education or school board levies, which are set provincially in most of the country and layered on top of the municipal rate.
• Check the assessment year. A mill rate paired with a stale assessed value understates or overstates the real bill.

Municipal levy vs total tax bill

In most provinces, the property tax bill a homeowner receives combines a municipal levy set by council with an education levy set by the province and, in some regions, additional levies for local boards such as conservation authorities or business improvement areas. The municipal mill rate covers only the municipal portion. OpenStats city pages report the municipal residential rate as the primary figure, since that is the number under direct municipal control and the one most useful for comparing local fiscal policy, and note where a combined bill would be materially higher once other levies are added.

Why rates trend the way they do

Municipal tax rates tend to move gradually rather than sharply, because most municipal revenue supports fixed, recurring costs (police, fire, transit, roads, water and sewer infrastructure) that do not change quickly year to year. Sharp year-over-year mill rate changes usually signal either a reassessment year with a large shift in the tax base, a new infrastructure levy or capital project being phased in, or a provincial funding change that shifted cost responsibility onto municipalities. When a city page shows an unusual jump, it is worth checking the municipality's own budget documents for the specific driver rather than assuming a uniform tax increase.

Renters are affected by mill rates indirectly. Property tax is a cost of holding real estate, and landlords factor it into rent-setting decisions over time, though the pass-through is slower and less direct than for an owner-occupier who sees the bill each year.

How a tax bill is calculated

In formula terms, municipal property tax equals taxable assessed value multiplied by the applicable rate class, then divided by the rate's denominator (often 1,000 for a mill rate). Many provinces also apply subclass multipliers or tax ratios so commercial, industrial, multi-residential, and farmland classes pay different effective rates from single-family residential. OpenStats city pages focus on the residential class because that is the figure most residents look up and the one used in cross-city residential rankings.

Assessment year and taxation year can diverge. A municipality may levy 2025 taxes on 2024 (or earlier) assessed values, sometimes with phase-in rules. Comparing a "2025 mill rate" in one city to a "2025 mill rate" in another still requires checking which assessment roll each rate sits on.

Provincial assessment systems at a glance

Quebec uses municipal assessment rolls under the Act respecting municipal taxation, with triennial rolls in many cities. Atlantic provinces outside Nova Scotia and Prairie cities with their own assessors follow related market-value rules with local variations. Always read the rate against that province's assessment statute before ranking "tax friendliness" from the mill rate alone.

Education and special levies

Education property tax is set provincially or through school authorities in most of Canada and appears on the same bill as the municipal levy. Conservation authorities, regional transit, library boards, and business improvement areas may add further lines. A city that looks inexpensive on the municipal residential rate can still produce a higher total bill once education and regional levies are included.

Ontario's Financial Information Return (FIR) Schedule 22 is a useful open source for municipal and education tax rates across that province. Nova Scotia publishes municipal tax rates through its open data portal. Elsewhere, rates often live in annual budget bylaws or tax-rate schedules on municipal websites. OpenStats normalizes those published residential rates onto a common per-$1,000 basis where the source allows.

Assessment growth vs rate decisions

When a city's total taxable assessment rises because of new construction, that is new tax base. When it rises because the same properties are revalued upward, councils often debate "revenue-neutral" rate cuts so average bills stay flat before service increases. Media coverage that quotes only the mill-rate percentage change, without assessment growth, can misstate whether typical homeowners paid more or less.

New construction also changes service demand. A fast-growing suburb may keep mill rates stable while expanding its assessment base, yet still face pressure on schools, roads, and water plants. Rate stability and fiscal pressure can coexist.

Tax ratios and property classes

Most provinces split the tax base into classes: residential, multi-residential, commercial, industrial, farmland, and sometimes pipelines or managed forest. Councils (or provinces) set tax ratios so non-residential classes may pay a multiple of the residential rate. A city can hold the residential mill rate steady while shifting burden toward commercial or multi-residential classes, or the reverse after a downtown assessment boom.

Ontario publishes class tax ratios and rates through the Financial Information Return. Alberta and B.C. municipalities publish class rates in annual tax bylaws. When a news story quotes "the mill rate," confirm which class it means. OpenStats rankings and city pages use the residential class for hometown comparison; business-class rates belong in a separate conversation about commercial location costs.

Local improvements and special charges

Beyond the general mill rate, many municipalities levy local improvement charges, frontage taxes, or capital surcharges for sidewalks, paving, flood-protection works, or neighbourhood revitalization. Those lines appear on the tax bill or on a separate notice and are usually tied to benefiting properties rather than the whole roll. They can make two neighbours on the same street pay different totals even at the same residential mill rate.

Comparative rankings that use only the published residential mill rate will miss those charges. Treat the mill rate as the controllable general levy; treat local improvements as address-specific overlays you confirm on the actual bill or municipal tax notice.

OpenStats rankings and the property atlas

The residential mill rate ranking orders municipalities by the normalized residential rate (rank 1 is the highest rate). Because assessment bases differ by province, a high rank means a high published rate, not automatically the highest dollar bill on a $500,000 market home. Pair the ranking with the property tax atlas city pages, which show rate, assessment context, and an estimated bill on a representative value where the source supports it.

Mill rates also feed the tax pillar inside the City Score. Published municipal years are used when available; gaps may follow a provincial median path so every seed city still moves in the decade panel. Those estimated paths are labeled in the corpus rather than presented as scraped bylaw figures.

How assessment data is produced

Assessment corporations and municipal assessors build rolls under provincial statutes. Ontario's Municipal Property Assessment Corporation (MPAC) values properties for taxation on a multi-year cycle with phase-in toward current value. British Columbia's BC Assessment reassesses annually to a July 1 valuation date. Nova Scotia's Property Valuation Services Corporation (PVSC) maintains values with a residential capped assessment program that can decouple taxable assessment from market value for long-held homes. Saskatchewan's Saskatchewan Assessment Management Agency (SAMA) and some city assessors apply provincial percent-of-value factors. Alberta municipalities assess at market value annually under provincial standards and set their own mill rates within that framework.

Rate schedules then come from municipal tax bylaws or provincial compilations such as Ontario's Financial Information Return Schedule 22. OpenStats records the residential municipal rate from those publications and normalizes units (mills, percent, per $100,000) onto a common per-$1,000 basis when the source allows.

Why mill rates differ across Canadian cities

Three levers move the published residential rate: the size of the municipal levy council needs, the size of the taxable assessment base, and class tax ratios that shift burden toward or away from residential property. A fast-growing suburb can hold rates steady while adding assessment from new construction, yet still face service pressure. A city with a capped or lagging assessment base can post a higher mill rate and still collect a similar dollar amount to a full market-value neighbour. Provincial funding changes for policing, transit, or social housing can also move municipal levy pressure without a change in "tax appetite."

Caveats when using OpenStats mill rates

• Rankings order published residential rates, not lifestyle or "tax friendliness."
• Compare estimated dollar bills on similar property values across provinces.
• Confirm whether education and regional levies are included in any total-bill figure.
• Local improvement charges are address-specific and sit outside the general mill rate.
• Confirm the property class when media or bylaws quote a single rate.

Primary sources

• Ontario FIR / municipal financial returns: efis.fma.csc.gov.on.ca/fir
• Municipal Property Assessment Corporation (MPAC): mpac.ca
• Nova Scotia open data (municipal tax rates): data.novascotia.ca
• Property Valuation Services Corporation (Nova Scotia): pvsc.ca
• BC Assessment (how assessments work): info.bcassessment.ca
• Saskatchewan Assessment Management Agency (SAMA): sama.sk.ca
• OpenStats: mill rate ranking, property atlas, City Score
• Related hub pages: methodology, data sources