我在FIRSTRADE有个户,最近收到PENSON FINANCIAL SERVICES的信,信封上写“IMPORTANT TAX RETURN DOCUMENT ENCLOSED",信的其中一頁寫:Generally,every nonresident alien individual,nonresident alien fiduciary,and foreign corporation with United States income,including income that is effectively connected with the conduct of a trade or business in the United States,must file a United States income tax return.
請問哪位收到過同樣的信,這封信是不是一定要理?不理有沒有後果?

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