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Line 6 of schedule 2 (Uncollected social security and Medicare tax on wages) is blank on the 1040. My suspicion that SS tax is being assessed was due to having my first W2 imported and a large refund expected. Importing the second (and yes, I've deleted and re-added manually with the same results) suddenly switches to a large amount due, seemingly equaled to the amount of "missing" SS tax from the second W2. Does the blank Line 6 rule this out?