Blog > Property Taxes in Eastern Ontario: What Your Bill Is Based On, and How to Estimate It Before You Buy
Property Taxes in Eastern Ontario: What Your Bill Is Based On, and How to Estimate It Before You Buy
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Short answer: your annual property tax in Ontario is calculated from the value MPAC assigned your property as of January 1, 2016, multiplied by the rates your municipality and the Province set each year. It is not calculated from what you paid. Buying at a higher price than the last sale does not, by itself, move your assessment. The most reliable way to estimate what you will pay is to get the seller's most recent final tax bill and apply this year's increase to it.
Your bill is not based on what you paid
This is the part that surprises most buyers, and it is worth being clear about before you start doing math on a listing.
Ontario assessments are handled by the Municipal Property Assessment Corporation, not by your municipality. MPAC's job is to assign every property a current value as of a fixed date. That date has not moved in a long time. The province-wide reassessment has been postponed repeatedly, and MPAC confirms that property assessments for the 2026 property tax year continue to be based on fully phased-in January 1, 2016 current values.
So the number driving your tax bill reflects what your property was worth almost a decade ago. Two houses on the same street that sold years apart at very different prices can carry assessments that look nothing like their sale prices, and the gap between assessed value and market value is often large.
The practical consequence: closing on a purchase does not trigger a reassessment to your purchase price. People expect their taxes to jump because they paid more than the last buyer did. Under the current frozen cycle, that is not how it works.
What actually makes up the bill
Two separate parties set the rates, and they show up as separate lines.
- The municipal portion. Your city or township council sets this rate each year through its budget. In Brockville, the city describes this portion as funding local police, fire, economic development, planning, engineering and public works operations.
- The education portion. The rate is set by the Government of Ontario, not by your municipality. Your city collects it and passes it along. Brockville states plainly that the education portion funds the four school boards and that the rate is set by the Province.
The City of Ottawa describes the same structure on its 2026 tax material: your bill is calculated using your assessed value from MPAC, municipal tax rates set by City Council, and education rates set by the Province.
That division matters when you are trying to work out why your bill moved. A council budget increase only moves the municipal share. It does not touch the education share.
What the two ends of the corridor did for 2026
Both councils passed budgets that raised the municipal portion this year. The figures below are the increases each council approved, not the underlying tax levels, and the two illustrations are calculated on different bases, so read them as two separate data points rather than a head-to-head comparison.
| Ottawa | Brockville | |
|---|---|---|
| 2026 approved increase | 3.75% | 3.99% to the average residential bill |
| Stated dollar illustration | About $166 more per year for the average urban homeowner, about $108 for the average rural homeowner | About $172 more per year on a home assessed at $250,000 |
| Date approved | December 12, 2025 | January 27, 2026 |
| Billing cycle | Final bills issued in May, due June 18, 2026 | Interim bill mailed end of January, due the last business day of February. Final bill mailed end of July, due the last business day of August |
Two things are worth pulling out of that table. Ottawa rates urban and rural properties differently, which is why the city quotes two different average increases. And the billing calendars are genuinely different at the two ends of the corridor, so if you are moving between them, the month your money is due changes.
How to estimate the tax before you buy
You do not need to guess at this. The information exists and it is straightforward to get.
- Ask for the seller's most recent final tax bill. Your agent can request it. This is the single most useful document, because it shows the actual assessed value, the actual rates applied and the actual annual total.
- Apply this year's approved increase to that total. That gets you close enough to budget with.
- Check whether the property is urban or rural for rating purposes if you are buying in Ottawa, because the two are not billed the same.
- Confirm the instalment dates with the municipality so you know when the money actually leaves your account, not just the annual figure.
- Ask whether the property has any local improvement charges or area-specific levies on the bill. These sit outside the general rate and do not always come up in conversation.
- If the home is a new build or has had a major addition, treat the current bill as unreliable. See the next section.
The adjustment on closing catches people out
Property taxes are prorated between you and the seller on closing. If the seller has already paid past your closing date, you reimburse them for the portion of the year you own the home. If they have not paid yet, the credit runs the other way.
Your lawyer handles this on the statement of adjustments, and it is a real number that shows up alongside the rest of your closing costs in Ontario. It is separate from land transfer tax, which is a one-time provincial tax on the purchase itself rather than a recurring annual cost. Buyers sometimes conflate the two and end up budgeting for one when they owe both.
What does change your assessment
The 2016 valuation date does not mean assessments never move. MPAC still updates a property when something about it changes rather than when it sells. New construction, a significant addition, a change in how the property is classified or used, or a structure being removed can all prompt an updated assessment.
This is why a brand new home is the case where the seller's bill tells you the least. On a new build, the land may be assessed while the house is not yet fully captured, and a supplementary or omitted assessment can arrive later covering the period after the home was ready. If you are buying new, ask directly how the property is currently assessed and what is still outstanding, rather than assuming the first bill you see is the steady-state number.
Where this fits in the decision
Property tax is rarely the thing that decides a purchase, but it is a permanent line in your monthly cost and it deserves a real number rather than a rule of thumb. If you are weighing two areas against each other, this belongs in the comparison alongside price, commute and the rest of what you are trading off. I have written separately about comparing Brockville and Ottawa if that is the choice in front of you.
One boundary worth stating: I am a real estate agent, not a tax advisor or a lawyer. For the treatment of a specific bill, a disputed assessment or the adjustments on your particular closing, the municipality, MPAC and your lawyer are the right people to confirm with.
If you are looking at a specific property between Brockville and Ottawa and want help pulling the actual tax figures before you decide, get in touch. I am happy to request the current bill and walk through what the annual cost really looks like for that address.
Sources and observation dates: MPAC, The Assessment Cycle, confirming 2026 tax year assessments remain based on fully phased-in January 1, 2016 current values, read September 1, 2026. City of Ottawa, 2026 Final Property Taxes, for bill composition and the June 18, 2026 due date, read September 1, 2026. City of Brockville, Property Taxes, for bill composition and interim and final instalment timing, read September 1, 2026. City of Brockville, City of Brockville Adopts 2026 Municipal Budget, for the 3.99% increase, the $172 illustration on a $250,000 assessment and the January 27, 2026 adoption date, read September 1, 2026. Ottawa Lookout, City council approves the 2026 budget, for the 3.75% increase, the $166 urban and $108 rural average illustrations and the December 12, 2025 approval date, read September 1, 2026. Municipal tax rates and budgets change annually, so confirm current figures with the municipality before relying on them.