You enter the full amount from box 5 of the SSA-1099. You don't allocate or adjust anything. After you enter the SSA-1099, the next screen will ask you whether you received a lump-sum payment. Select Yes, then go through the subsequent screens for one of the years for which you got a lump-sum payment. When you get to the "Lump-Sum Social Security Payments Summary," if you have a lump sum for another year, click the button that says "Add Another Lump Sum." Repeat the process for each year that you got a lump-sum payment for. After you have entered all the years, click Done on the summary screen. TurboTax will determine whether the Lump-Sum Election will save you any money, and will fill out your Form 1040 appropriately.
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