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The payment you received is taxable for the 2015 tax year. Even though it was a lumpsum payment for past years it is still taxable in the year received.
You must include the taxable part of a lump-sum payment of benefits received in the current year in your current year's income, even if the payment includes benefits for an earlier year.
There are two ways to determine the amount of income to include if this was SS disability:
You can select the lump-sum election method if it lowers the taxable portion of your benefits:
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