Undisclosed Property Tax Arrears After Closing in Ontario: Who's Responsible?

You've closed on your new home, the movers have come and gone, and then a notice arrives from the municipality: there are unpaid property taxes on the property from before you owned it. It feels like it should be someone else's problem — and often, it is. But whether you're actually on the hook, and who has to fix it, depends on how the transaction was handled at closing.

Undisclosed property tax arrears after closing are usually a paperwork failure rather than a legal grey area — the process that's supposed to catch outstanding taxes before closing has a specific mechanism, and when arrears surface afterward, it's worth understanding exactly where that mechanism should have worked and didn't.

Property Taxes Run With the Land, Not the Owner

The first thing to understand is that unpaid municipal property taxes attach to the property itself, not just to the individual who owed them. A municipality's ability to collect arrears doesn't automatically disappear because ownership changed — which is precisely why real estate closings are built around catching and clearing arrears before the deal completes, rather than leaving it to be sorted out afterward.

This is also why title insurance and a careful closing process matter on every purchase, not just unusual ones: tax arrears are one of several types of financial encumbrance that need to be identified and dealt with before or at closing.

How Tax Arrears Are Supposed to Be Caught: The Tax Certificate and Statement of Adjustments

On a typical Ontario resale closing, two closely related steps are meant to prevent exactly this problem:

1. The Tax Certificate

The buyer's lawyer typically requests a tax certificate (or verification) directly from the municipality shortly before closing, confirming the amount of property tax paid, owing, and any arrears as of a specific date. This is the primary check against exactly this risk.

2. The Statement of Adjustments

Property tax, along with utilities and other shared costs, is reconciled between buyer and seller through a statement of adjustments prepared by the lawyers as part of closing. If the seller has prepaid taxes beyond the closing date, the buyer generally reimburses that prepaid portion; if taxes are owing as of closing, the adjustment is meant to account for that so the seller effectively pays their share out of the sale proceeds.

When arrears surface after closing despite this process, it usually means one of these steps didn't happen, didn't happen correctly, or relied on information that turned out to be inaccurate or outdated.

If You Discover Arrears After Closing

1. Get the details in writing from the municipality — the exact amount, the period it relates to, and whether it predates your ownership.
2. Pull your closing file. Your statement of adjustments and any tax certificate obtained before closing are the key documents.
3. Compare the municipal record against what your closing documents assumed. A mismatch between the certificate relied on and the actual arrears is the central fact of any recourse.
4. Contact the lawyer who acted for you on the purchase. If the arrears should have been caught and weren't, this is generally the starting point for resolving who bears the cost.
5. Check whether you have title insurance. Many title insurance policies cover certain undisclosed tax arrears predating the policy date — this is worth reviewing before assuming you must pay out of pocket.
6. Don't ignore the municipal notice while you sort out responsibility. Property tax arrears can continue to accrue penalties and interest, and ultimately can put the property at risk of a municipal tax sale process if left unresolved — dealing with the municipality and your recourse can, and generally should, happen in parallel.

Who Ultimately Pays?

There's no universal answer — it depends on the specific facts:

• If the arrears predate closing and weren't properly adjusted for, the seller (or their proceeds, if still available) is typically the intended source of that money, and the buyer's lawyer's errors-and-omissions coverage or a title insurance claim may be the practical route if the seller's funds are no longer recoverable.
• If the arrears relate to a period after closing that you simply haven't paid yet, that's a straightforward current obligation, not a "closing surprise" at all.
• If a tax certificate was obtained and reasonably relied on but still turned out to be wrong through no one's fault, responsibility can become a more complex question that depends on the specific facts and documents.

Frequently asked questions