父母剛拿到美國綠卡， 不知道他們每年要不要報稅？我的理解是收入在一定水平以下的不需要報稅。可是，不報稅會不會影響他們以後申請公民？
--If you have no income or if the income falls below the IRS minimum , you typically aren't required to file a tax return. But your parents had better file it even if they don't have income or less income than a certain level because they plan to apply for US citizenship and the tax return is needed in this matter.
看了移民局的Naturalization所需的材料，裏頭說如果從變為permanent resident以來沒有報過稅的，要提供與IRS的往來信件。
-This kind of docments normally is availabe for some people who have some kind of reason not to file the tax return or delay to file it and get approval from IRS. it does not apply to your partents' case (no income) because they are not required to file tax return due to no income.
不知道這裏有沒有綠卡期間沒有報過稅，但成功拿到公民的例子？不管是本人還是替父母申請成功的。需要IRS什麽樣的信件？
我在大農村，周圍沒有人可以問，在這裏謝謝大家了！
