IRS Form 637, Application for Registration (For Certain Excise Tax Activities), is a document developed for taxpayers who would like to apply for excise tax registration with certain activities. A list of these activities can be found in the Internal Revenue Code (Sections 4101, 4222, and 4682).
The purpose of this form is to provide filers with a Certificate of Registry or a Letter of Registration issued by the Internal Revenue Service (IRS), which they will then receive after the IRS processes and approves their application.
The application was last revised on August 1, 2019. A fillable Form 637 is available for download below.
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