How Your Ontario Property Tax Is Actually Calculated — and Why Toronto’s Rate Beats the 905
Property tax = MPAC assessed value × total rate. And that assessed value is still frozen at January 1, 2016 — not today’s market price.
How is Ontario property tax actually calculated, and why is Toronto’s rate lower than the 905?
The formula is simple: MPAC assessed value × total tax rate (municipal portion + province-set education portion). The twist is that the assessed value is not today’s market price — according to MPAC and the Province of Ontario (2026), assessments are still frozen at the January 1, 2016 valuation date because the reassessment has been postponed, so 2026 taxes are based on 2016 values. Toronto’s total residential rate is about 0.767% (toronto.ca, 2026) — one of the GTA’s lowest, thanks to a large commercial tax base — but a low rate on a high value still means a real bill.
Source: MPAC (mpac.ca, 2026) / Ontario Ministry of Finance (ontario.ca, 2026) / City of Toronto (toronto.ca, 2026)
I’m Arthur Zhao. Every time the property tax bill lands, clients ask me the same two things: “How is this number even calculated?” and “Why is my Toronto home worth so much more, yet my tax rate is lower than my friend’s in Markham?” The answer to both hides in one formula and one fact most homeowners don’t know — your tax isn’t based on today’s market price, but on an assessed value frozen back in 2016. Here’s the formula, where that assessed value comes from, how Toronto and the 905 actually differ, and a worked example on real published rates — so you can finally read your own tax bill.
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One formula: assessed value × total rate
Every residential property tax bill in Ontario comes from the same formula: MPAC assessed value × total tax rate. According to the Province of Ontario (ontario.ca, 2026), that total rate is built from two parts: a municipal portion, set by your city or town from its annual budget, and an education portion, set uniformly by the Province of Ontario. A quick example: if your MPAC assessed value is $800,000 and your city’s total rate is 0.75%, your tax for the year is $800,000 × 0.75% = $6,000. Simple enough — but every variable in that formula has a story, especially the assessed value.
MPAC assessed value: frozen at 2016, not today’s price
What that means in practice: even if your home’s market price has doubled, absent a major renovation or addition, your assessed value has barely moved. Many clients assume “prices went up, so my tax must go up too” — but during an assessment freeze, the two are decoupled.
ℹ️Hold on to this counterintuitive fact: Ontario property tax is calculated on the January 1, 2016 MPAC assessed value (MPAC / ontario.ca, 2026); the reassessment is postponed, so the 2026 tax year still uses 2016 values. Your market price can rise while your assessed value doesn’t — the two are decoupled during the freeze.
Municipal rate: your city back-solves it from the budget
So the same $800,000-assessed home carries a different municipal rate — and a different bill — in different cities. The gap comes from each city’s budget size and tax base, not from your home itself.
Education rate: set by the province
Why is Toronto’s rate one of the lowest?
It surprises people the first time: Toronto has some of the priciest homes in the GTA, yet one of the lowest residential tax rates. According to the City of Toronto (toronto.ca, 2026), Toronto’s total residential rate is about 0.767311%. The reason is no mystery: Toronto has a huge commercial and office tax base — office towers, malls, and industrial properties shoulder a large share of the load, which lets the residential rate stay low. Many 905 cities are more residential, with a thinner commercial base, so the same municipal spending falls more heavily on homes, pushing rates up. But a low rate doesn’t mean a low bill — 0.767% on a high assessed value is still real money.
⚠️A low rate is not a low bill. Toronto’s residential rate is one of the GTA’s lowest (about 0.767%, toronto.ca 2026), but applied to a high assessed value the dollar amount is still substantial. When comparing property tax across cities, compare the final “assessed value × total rate” dollar figure — not just the rate percentage.
Toronto vs. Markham: break the rate apart
Toronto (toronto.ca, 2026 — total 0.767311%):
• City: 0.605295%
• City Building Fund: 0.009016%
• Education (province): 0.153000%
Markham (markham.ca, 2025 — total 0.700278%):
• City of Markham: 0.171415%
• York Region: 0.375863%
• Education (province): 0.153000%
Note that Markham has two municipal layers (the city plus York Region) — you add both to get its municipal portion — whereas Toronto is a single tier. The 0.153% education slice is identical on both, confirming it’s the province’s uniform rate.
Same assessed value, two bills: a worked example
Take a home with an MPAC assessed value of $1,000,000 (this assessed value is illustrative — your own comes from your MPAC notice) and run it through each city’s real published rate:
Toronto (0.767311%): $1,000,000 × 0.767311% = about $7,673/year
Markham (0.700278%): $1,000,000 × 0.700278% = about $7,003/year
On the same assessed value, the Toronto home is actually about $670 higher — because although Toronto’s municipal rate looks low, once you add York Region into Markham’s total, the two cities’ total rates land fairly close. (Rates per toronto.ca 2026 and markham.ca 2025; assessed value illustrative.)
💡 This is the confusion I see most: MPAC’s assessed value and your purchase/sale price are two different numbers. The assessed value reflects the January 1, 2016 legislated valuation date (MPAC, 2026); the sale price is what you negotiated in today’s market. The two can diverge sharply, especially after the price run-up of recent years.
So if your MPAC assessed value looks far below what you paid, that does not mean the assessment is wrong, and it doesn’t mean your home is “worth less” — it’s just the normal result of an assessment freeze. Likewise, the assessed value isn’t your pricing benchmark when you sell; the market is.
Bought a new build? Watch for the supplementary bill
The result: you may first pay lower tax on just the land, then later receive a retroactive catch-up bill once the structure is assessed — potentially a sizable amount, and sometimes covering a year or two at once. For clients buying new, I always flag setting cash aside for this.
🚨Buying a new build or pre-construction? Paying low land-only tax for the first year or two is normal — then MPAC issues a supplementary/omitted assessment and a retroactive catch-up bill (MPAC, 2026), which can be sizable and cover a year or more at once. Set cash aside so it doesn’t blindside you.
How to find your city’s current rate
• Find your assessed value: log into MPAC’s AboutMyProperty portal (using the Roll Number and Access Key on your assessment notice) to see your home’s current assessed value.
• Find the rate: search your municipality’s official site for its “property tax rates” page for the current year — Toronto at toronto.ca, Markham at markham.ca, Vaughan at vaughan.ca, Richmond Hill at richmondhill.ca all publish official rate tables.
Assessed value × current total rate = your tax. This article is educational; confirm your exact assessed value, rate, and any supplementary assessment with MPAC and your municipality’s latest official figures.
Frequently Asked Questions
How is Ontario property tax actually calculated?
One formula: MPAC assessed value × total tax rate. According to the Province of Ontario (ontario.ca, 2026), the total rate is the municipal portion (set by your city from its budget) plus the education portion (set uniformly by the province). For example, an $800,000 assessed value at a 0.75% total rate produces $6,000 in tax for the year.
Why is Toronto’s tax rate lower than the 905 when its homes cost more?
Because Toronto has a large commercial and office tax base that shoulders much of the load, keeping the residential rate low. According to the City of Toronto (toronto.ca, 2026), its total residential rate is about 0.767311%, one of the GTA’s lowest. But a low rate isn’t a low bill — applied to Toronto’s high assessed values, the dollar amount is still large.
My home’s value jumped — why didn’t my property tax jump with it?
Because your tax isn’t based on today’s market price. According to MPAC and the Province of Ontario (2026), assessments are still frozen at the January 1, 2016 valuation date; the reassessment is postponed, so the 2026 tax year still uses 2016 assessed values. Absent a major renovation, your assessed value stays roughly flat during the freeze, decoupled from market price.
Why is MPAC’s assessed value so different from what I paid?
They’re two different numbers. The MPAC assessed value reflects the January 1, 2016 legislated valuation date (MPAC, 2026), while your sale price is what you negotiated in today’s market. After recent years’ price gains, an assessed value well below your purchase price is normal, not an error.
I just bought a new build — why did I get an extra tax bill afterward?
That’s most likely a supplementary or omitted assessment. According to MPAC (2026), once a new home is completed and occupied, MPAC assesses the structure’s value and issues a retroactive catch-up bill. You may have paid lower land-only tax before, and the catch-up can cover a year or two at once — a sizable amount, so budget for it when buying new.
Arthur Zhao
Real Estate Broker · FRI · ABR · SRS · PSA · MCNE · E-PRO · CLHMS & GUILD Elite · REAIS
VP & Branch Manager, Bay Street Group Inc.
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