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@yeknod wrote:

EIN in on the 1099's not SS#.  

I have had individuals get balance notices because their income was lower than what they reported.

I'm not sure how that works with S-Corp.

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For many years, IRS did not match K-1s to 1040s.  Then they started doing it on a selective basis -- probably, only for higher incomes.  I haven't seen any examples of matching 1099s to 1120, 1120S or 1065 returns, but they might be doing it, at least on a sample basis.  They probably have a tolerance if the total is less than 10% different from what is shown on the return.  What is important is to report the income correctly, and that might mean using the 1099s as a better method than the bank deposits if some December checks are not deposited until January.