Naturalization applicant here: Current N-400 fees are $680 including biometrics[1].  Used to be a lot more, closer to $1000.<p>(That is certainly <i>not</i> counting the thousands of dollars to get to the point where I was eligible for naturalization.)<p>1. <a href="https:&#x2F;&#x2F;www.uscis.gov&#x2F;n-400" rel="nofollow">https:&#x2F;&#x2F;www.uscis.gov&#x2F;n-400</a>