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我是加拿大公民，现在持有签证在美国工作，明年可能回加拿大定居：

1）这边的房子准备卖掉，那就没有永久的美国地址，那么银行账户还能keep吗？-I think so. Update your address to your Canadian address with the bank.

2）SSN是不是就无效了？-SSN is valid for your whole life time, but you may not qualified for some of the social security benefits if you don't live in US permanently.

3）401K和HSA账户还能keep吗？到了退休年龄才能取出？

4）股票账户还能继续持有吗？还能继续投钱炒股吗？

-I am  not familiar with these two questions. You may post it to 法律咨询