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@ESL Teacher wrote:

Would it be better to subtract the amount earned in December from the total for the year?


Yes, you could do that but you have to report the income for the entire year on your S corporation return since the 1099 was issued in the name of the corporation with the entity's EIN. 

 

So, just subtract the January through November period from the December (i.e., December belongs to the S corporation and the balance to your sole proprietorship).