KEY POINTS
  • In a down market, you may consider tax-loss harvesting, which can turn portfolio losses into tax breaks.
  • But you need to familiarize yourself with the "wash sale rule," which blocks you from buying a “substantially identical” asset within the 30-day window before or after the sale.
  • With limited IRS guidance, this rule may be tricky for mutual funds and exchange-traded funds, experts say.

The end of June marked the worst first six months of a year since 1970 for the S&P 500 Index, which plummeted by more than 20% since January. But there's a silver lining: the chance to turn losses into tax breaks — as long as you follow the rules. 

The strategy, known as tax-loss harvesting, allows you to sell declining assets from your brokerage account and use the losses to reduce other profits. Once losses exceed gains, you can use the excess to decrease your regular income by up to $3,000 per year.