Offer your thoughts or opinion on the input financial query or topic using your financial background.

Why is tax loss harvesting helpful for passive investing?
I wrote a detailed article on Tax Loss Harvesting to show the impact on returns.  For my example, I showed a person in the 15% bracket. In years with no loss, they trade to capture gains at 0% long term rate, thus bumping their basis up. In years with losses, they tax harvest for a 15% effective 'rebate' on that loss.  I showed how for the lost decade 2000-2009, a buy and hold would have returned -1% CAGR, but the tax loss harvester would have gained 1% (just 1% for the decade, not CAGR), ending the decade with no loss.  As one's portfolio grows, the math changes. You can only take $3000 capital loss against ordinary income, and my example relies on the difference between taking a gain for free but using a loss to offset income. Note, the higher earner would take gains at 15%, but losses at 25%, but only for the relatively small portfolio. The benefit for them is to use loss harvesting to offset gains, less so for ordinary income.  As the other answer state, Wealthfront can aid you to do this with no math on your part.