YSK: The IRS will never call you. They will never email you or text you. The only instance they will call is if you owe large amounts of back taxes or if you're subject to a field audit. In these cases, they will send a letter to you letting you know about the call before it happens.
from /r/YouShouldKnow
国税局不会给你打电话的 他们不会给你发邮件或短信 他们唯一会打电话给你的情况是，如果你欠了大笔的税款，或者你要接受实地审计。在这些情况下，他们会给你发一封信，让你在电话发生之前知道。