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As per CRA, you cannot have a capital loss when you sell depreciable property. You can have a terminal loss. For more information, go to Column 6 – Undepreciated capital cost (UCC) after additions and dispositions (column 2 plus column 3....
However, you can claim terminal loss from your rental income. As per CRA, you will have a terminal loss when you have no more property in the class at the end of a year, but you still have an amount you have not deducted as capital cost allowance (CCA).
In the year you dispose of your rental property, you can subtract this terminal loss from your rental income and, if the loss is more than your rental income, you can create a rental loss.