You will need entries for Column A and B if there are numbers in Column C. They are usually there but sometimes come blank.
For Column A, that is the monthly cost of your health insurance plan from the Marketplace. What you paid + Column C = Column A.
The second lowest cost Silver plan (SLCSP) premium can be found in Column B of your Form 1095-A, but sometimes it may be missing or incorrect.
Click this link for the Marketplace calculator tool to determine what number should go in Column B.
If there are any months with a 0 in Column C, just leave A, B, and C all blank for those months.
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