“Tax-loss harvesting allows the investor to more efficiently produce after tax results that over time can create additional alpha and more effectively meet their goals,” says Andrew Whalen, CEO of Whalen Financial in Las Vegas. Alpha is created when an investment outperforms its related benchmark index. His firm implements prudent tax-loss selling throughout the year. At the end of 2018, when the stock market dropped, many investors attempted to sell stocks or funds with losses to offset profitable sales from earlier in the year, says Daniel Kern, chief investment officer at TFC Financial Management in Boston. Kern sold losing international funds last December, replacing these assets with similar, although nonidentical, global funds.