房子不卖不用交税。但拿了绿卡后，卖房时，卖房时的增值部分（包括拿绿卡前的部分）就会算成当年的capital gain交美国的税。

所有跟帖： 

• If ordinary tax is in 15% bracket, capital gain is 0%. -Wendy666- ♀ (0 bytes) () 05/12/2017 postreply 14:53:43

• capital gain + income up to 75k is 0% -laoyangdelp- ♀ (58 bytes) () 05/14/2017 postreply 16:22:26