“The new proposal would treat all 401(k) and traditional IRA contributions as if they were Roth IRA contributions. You’d lose the tax exclusion of those contributions, but your future 401(k)/IRA earnings and appreciation would be tax-free. Some think this could raise $1.5 trillion in additional tax revenue over the next decade, making the corporate tax slash feasible. Unless they decide to tax retirement earnings and appreciation too.”
Read more: https://banyanhill.com/congress-coming-401k/