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Home / CheckMark Payroll, Miscellaneous / What is EFW2 (formerly MMREF)?

What is EFW2 (formerly MMREF)?

EFW2 is Filing Forms W-2 Electronically, formerly referred to as MMREF. If you are filing W2s for 250 or more employees to the Social Security Administration, these must be submitted in the EFW2 format either by uploading to the Social Security Administration through Business Online Services (BSO) or Electronic Data Transfer (EDT) instead of paper forms.

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