Sorry to ask such a simple question, but I have been doing my Dad's taxes for 15 years. I have not filed his Federal for the last 4 years because no taxes are owed or paid. He is 82, single, social security, small pension, IRA withdraw and some interest and some small capital gains and dividends. I am pretty sure I don't have to mail in the forms, but could someone confirm I am correct. I do mail in his State due to a credit he receives.