Register now for FREE unlimited access to Reuters.comWASHINGTON, April 26 (Reuters) - Wealth advisers are counseling clients to max out their retirement accounts, park gains in tax-deferred opportunity zone funds and even sell some assets to avoid being clobbered by a potential U.S. capital gains tax hike.The White House will this week propose nearly doubling taxes on capital gains to 39.6% for people earning more than $1 million, Reuters and other media outlets reported, in what would be the highest tax rate on investment gains since the 1920s.Any changes will be hard-fought in Congress,...…Register now for FREE unlimited access to Reuters.comWASHINGTON, April 26 (Reuters) - Wealth advisers are counseling clients to max out their retirement accounts, park gains in tax-deferred opportunity zone funds and even sell some assets to avoid being clobbered by a potential U.S. capital gains tax hike.The White House will this week propose nearly doubling taxes on capital gains to 39.6% for people earning more than $1 million, Reuters and other media outlets reported, in what would be the highest tax rate on investment gains since the 1920s.Any changes will be hard-fought in Congress,...WW…