Make sure that you are going the entire way through the section for the lump-sum benefits and, if you elect to use your income from the prior years to tax those benefits, that you are entering all of the information requested separately for each year for which your lump sum benefit applies.
Also be sure that with each lump sum amount you are entering that year's Box 5 number (which is likely 0) and not the Box 5 from your current year benefit payment (this is a common entry error.)
TurboTax will ask you the amount of your taxable social security in prior years in relationship to the lump-sum but you do not have the option to enter this amount for the current year. The current year taxable amount is calculated by the program.
TurboTax will adjust the tax amount due after all of the entries are complete, if appropriate.
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