On November 2, 2021, the IRS published Publication 1220, Specifications for Electronic Filing of Forms 1097, 1098, 1099, 3921, 3922, 5498, and W-2G For Tax Year 2021 (Rev. October 2021). Check out the October 2021 updates made to Pub. 1220 in Part E. Exhibit 2, Publication 1220 Tax Year 2021 Revision Updates. There are a number of formatting changes to note.
Check out the October 2021 Revision of Pub 1220 here: https://www.irs.gov/pub/irs-pdf/p1220.pdf
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