You are allowed to deduct up to $3,000 of capital losses against your other income in any given year.
If you have more than $3,000 of losses the amount over $3,000 is carried forward to the following year.
From your question, I take it that in 2015 you had total capital losses of $3,617. The $3,000 was deducted in 2015 and the balance carried forward to 2016.
