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UCC is undepreciated capital cost (UCC) which is the balance of the capital cost remaining for further depreciation at any given time. The amount of Cost of Capital Allowance (CCA) you claim each year will lower the UCC of the property.
In other words, if you purchased a brand new car for $10,000 in 2019, the beginning UCC for that year is the full price you paid. Next year (2020) the beginning UCC will be 10,000 less CCA claimed for 2019.