Oakville property tax: two interim and two final instalments
Oakville issues interim bills at the end of January and final bills in mid-May. In 2026 the interim instalments were due February 25 and April 27, and the final ones June 25 and September 25. The Town's pre-authorized plans let you pay in four, nine or 12 monthly instalments. Interest is charged at 1.25% per month, which the Town describes as 15% a year, and it is applied on the first day of each month of default. The dates change each year, so follow your bill.
Source: Town of Oakville: tax due dates and payments (opens in a new tab)