Moreover, the 2016 tax cut already indexed the capital gains tax to inflation, if indirectly. It did so by establishing three brackets for capital gains rates, and indexing them to inflation. For the 2018 tax year, taxpayers earning up to $77,201 pay a 0% tax on capital gains. Those with income from $77,201 to $479,001 pay 15%, and everyone earning more pays the 20% rate. For 2019, those brackets will be higher by about 2% — the rate of inflation. (The dollar figures are for joint filers.)
Source: latimes.com – Los Angeles Times