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Yes, there is other income and results in part of my SS being taxable and therefore there is an amount on 6b. But that is not the issue.  The real problem is I received 2 SSA-1099's.  Neither is correct.  The income reported on the 1st one is correct and reflects the SS benefits I received.  The 2nd one includes, as income, the reimbursement for the premium that was overcharged and collected for the month following my husband's death.  That is not income, it is paying back for something they should not have collected.   On top of that they deducted Fed Tax from the reimbursement which shouldn't have happened since it was not income.  If you get charged for something you didn't buy and the store refunds your money, it is not income and taxes shouldn't be deducted.  The store owes you the total amount they over charged you.  Since the tax was deducted, I now have to get it back from the IRS who is the one who has it now.  So, the way I am handling it is to report the correct amount of income, which would be reflected on the 1st SSA-1099 and I am reporting the correct amount of Fed Income Tax deducted, which would be on the 2nd SSA-1099.  I feel I need to explain this to the IRS using "Supporting Details" but the input section for this doesn't allow it.  Most input allows you to double click and open "Supporting Details".  Since I file electronically, I am not able to type up an explanation and attach it to the return. So how can I submit an explanation for the fact that what I am reporting does not agree with any one SSA-1099 due to their compounded error.