gain tax rate is 0%. 少于50万的话, LTC gain tax is only 15%.
如果你在某一年的收入比较少的时候, 比如 Take a unpaid long term leave, 就可以卖出一些 Long Term 的capital holdings at 0% tax rate.
详情: https://www.investopedia.com/terms/c/capital_gains_tax.asp
退休后,先保持几年的低收入,才能把 一小部分的401K 按低税率 转移至 ROTH .