Is it mandatory to file C-4 electronically?
No. You can mail the printed paper forms as you did before. By filing electronically, you save the cost of printing and mailing. The EC-4Narr must be filed electronically and it replaces the C-4 and C-4.2. The additional advantage of filing the EC-4Narr is the ability to include diagnostic test results and explanations.
Related Questions
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