Form 637 is used to apply for registration under the Internal Revenue Code for activities that involve excise taxes. These include activities like producing or selling fuel, chemicals, or ozone-depleting substances, among others. Registration via this form is required before engaging in these excise-related activities, and it ensures the IRS has accurate records for tax compliance and monitoring.
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You need to file Form 637 if you're engaging in activities requiring excise tax registration, including but not limited to:
Each registrant applies under a specific "Activity Letter" (e.g., Activity Letter M for alternative fuelers), depending on the business activity.
You need Form 637 to:
Failure to register properly can result in denied claims, assessed penalties, and inability to operate in excise-tax-regulated industries.
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