Reply To: What if I move before stamp? Home › Forums › NFA Tracker › Form 4 Questions › What if I move before stamp? › Reply To: What if I move before stamp? 20170106 at 9:34 am #75986 BilboParticipant Posts: 6 Join Date: 12/25/2016 You’ll need to file a form 20, change of address. You can fax it in now while your stamp is in progress, or wait until your form 4 gets approved and do it then.