How do I tell if I received interest or dividend income? and I did not cash any stock in so do I need to enter anything? Last year they said I didn't need to because I in

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If you had received interest or dividend income you would have received a Form 1099-INT or a Form 1099-DIV.  Often these are included on the same broker year end tax statement.  Many brokers provide online access to year-end tax documents.  If you didn't have any interest or dividend income and didn't sell any investments, then it sounds like you don't have any investment information to enter for your tax return.