USCIS Message: Previous Editions of Forms Accepted Until February 21, But Must Include New Fees

USCIS alert that when new fees went into effect on 12/23/16, updated versions of most forms were published. USCIS now states that it will accept prior versions of these forms, with the exception of Form N-400, until 2/21/17. All filings postmarked 12/23/16 or later must include the new fees.