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@BobKamman wrote:

"There are also 941's filed with incorrect or missing SSN's"

941's haven't been filed with SSN's since the late 1970s. SSN's are only reported on W-2s.  

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In the end, these need to be reconciled against W-3/W-2.  Have spent plenty of time helping MNC's rectify their year-end reconciliation of inbound and outbound international payroll reporting.