If you received no other income this year, you may want to consider increasing the adjusted - cost base of your holdings by selling securities in which you have capital gains. (canadiancapitalist.com)
Tax loss harvesting is the practice of selling a security at a loss in order to offset taxes on income and gains. (purefinancial.com)
But you may also owe taxes if the fund realizes a gain by selling a security for more than the original purchase price — even if you haven't sold any shares. (investor.vanguard.com)