On the ATF eForm 4, you can have your FFL add your UPIN number to application on the Transferee page, if you are applying as an individual. The UPIN box is located at the bottom of the Transferee page and is question 17.
If you are applying as a trust, corporation or other legal entity, your UPIN number would be entered on the Responsible Persons page right about the Save & Close button.
How to guide and walk-through guide for the ATF Form 4 NFA Tax Stamp Application - ATF 5320.4 Application for Tax Paid Transfer and Registration of Firearm
How do I fill out the ATF Form 4 Tax Stam...
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The ATF has released the new December 2025 revisions for the paper ATF Form 1, ATF Form 4.. The ATF Form 5, ATF 5320.23 and ATF 5320.20 weren't revised during this update. The previous versions o...