1貌似太迟了但2好象还可以啊，网上

狗到这么说：Contribution Deadline: Sole ProprietorshipIf your sponsoring business (adopting employer) is a Sole Proprietorship, you have until April 15th to make your annual Solo 401k contribution , or October 15th if you submit an extension to file your tax return.

所以明天我想去fidelity 面对面确认一下。

能减一分是一分。这种自己吃自己的交税挺心疼的。

谢谢懒觉。