On the Social Security Benefits Worksheet, line 18 also states "If prior year lump-sum benefits were received, go to line 19, otherwise, skip line 19 and enter the amount from line 18 on line 20." If line 19 is blank, then that means there were no lump sum benefits received, so the amount on line 20 should equal the amount on line 18.
In the first part of your question, you mentioned Smart Worksheets, however there are multiple Smart Worksheets in the TurboTax program, so I can't be certain which worksheet your post relates to. If you could repost and give some information about the particular Smart Worksheet. It is possible to have negative amounts such as in a capital loss that can be deducted.
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