One in four low-wage workers face marginal net tax rates above 70 percent, effectively locking them into poverty. Over half face remaining lifetime marginal net tax rates above 45 percent. The richest 1 percent also face a high median lifetime marginal tax rate – roughly 50 percent.

That is from a new NBER paper by David Altig, Alan J. Auerbach, Laurence J. Kotlikoff, Elias Ilin, and Victor Ye.