When new fees for most USCIS forms went into effect on December 23, 2016, USCIS published updated versions of the forms at uscis.gov/forms. USCIS strongly encourages customers to submit these new versions, which are updated with the new fees and have an edition date of 12/23/16.
USCIS will accept prior versions of forms, with the exception of Form N-400, until February 21, 2017. However, all filings postmarked 12/23/16 or later must include the new fees or USCIS will reject them.
USCIS will accept only the 12/23/16 edition of Form N-400, Application for Naturalization.
The updated forms are currently available only at uscis.gov/forms, where all of the forms can be downloaded for free. USCIS will issue another alert when paper copies become available.